WATER SUPPLY - 2



WATER SUPPLY

ANNEX A (Clauses 7.1. and 7.4.)

TEST FOR SCREW THREADS FOR INLET AND BACKNUTS SHANKS

A.1. Apply a torque of 15 Nm in tightening the back nut of inlet shank by a spanner which is snug fit to the hexagon.

A.2. There shall be no signs of visible distortion of the threads or of the flats of hexagon.

ANNEX B (Clauses 7.5.3)

DEFLECTION TEST OF ASSEMBLY

B.1.  Modify the float valve to be tested by removing the diaphragm and substituting a rigid steel disc of the same diameter.  Fix the assembled valve into a rigid wall 19 mm thick.  Position the inlet shank within the wall so that the union nut end is 19 mm behind the wall. Gradually apply of 4.4N in the closing direction at the float connection and immediately note the deflection.  Leave for 28 days in the loaded position and again note deflection at this point (see Fig.2.)

All Dimensions in Millimeters

Fig.2. Valve assembly Deflection Test

ANNEX C (Clauses 8.2.)

SHUT OFF TEST

C.1. Apparatus - A Cistern in which the float valve can be installed and which allows the attached flat to be half immersed in water.  A water supply capable of providing the required pressure and a pressure gauge to indicate the test pressure.

C.2. Procedure - Install the float valve assembly with the required seat in the cistern.  Fill the cistern with water until the float is immersed to half its value gradually apply an appropriate presser up to that indicated in 8.2.

C.3. Result - Record any evidence of the valve passing water.

Note: For valves normally fitted with a discharge arrangement which conducts water in the cistern, it is permissible to remove the arrangement whilst conducting this test.

ANNEX D (Clauses 8.3)

ANTI-SIPHONAGE TEST

D.1. Apparatus - The apparatus consists of:

(a)  A galvanized mild steel cylinder with modified connection on the side to take 50 mm dia pipe work and with other connections for vacuum line, pressure gauge to indicate the test pressure (see Fig.3.)

(b)  A transparent sigh tube (c) Accurately calibrated vacuum gauges to measure 0 to 0.1. Mpa vacuum.(d)  A 50 mm quick opening valve. (e)  A transparent catch pot

(f)  A galvanized mild steel cistern of not less than 225 litre capacity on a stand (g)  A full way valve of 50 mm diameter (h)  A suitable shut off valve. (i)  A mean of producing and maintaining vacuum of not less than 0.09 Mpa (for example a pump or ejector) (j) A drain valve. (k)  A valve under test (l)  Pipe work between cylinder and fitting to connect the above items as shown in Fig. 3 to be 50 mm in nominal bore and not exceeding 2 m  in length (m)  A water supply (n)  A length of 0.75 mm diameter nylon thread

D.2. Procedure - The following procedure shall be adopted

i)  Fill the water way over the whole passage from inlet to discharge by the insertion of the nylon thread.

ii)  Install the float valve and the float in the cistern.

iii)  Connect up the apparatus as shown in Fig.3.

iv) Run water into the cistern until the water level is at the horizontal center line of the float operated valve.

v)  Close valves (d), (g) and (k) and open valve (h)

vi)  Activate the means for producing the vacuum until the gauge reading on the cylinder is 0.09 Mpa

vii)  Close valve (h) and open valve (g)

viii)  Quickly open valve (d) and allow it to remain open for 60 second.

ix)  Close valve (d) and (g) and open valve (K)

x)  Examine the catchpot for the pressure of any water.

xi)  Repeat the test so that the full vacuum is obtained over a period of not less than 60 seconds.

Adjust the water level in the cistern to 20 mm below the centerline of the valve and repeat the tests described in (v) to (x).  Repeat the test at 20 mm intervals of level until the water level is at least 20 mm below the bottom end of the discharge arrangement.

(a) Mild steel cylinder

(b) & (c) Vacuum gauge measure 0-0.1

Mpa (0-762 mm Hg)

(d) Supporting arrangement for cistern

(e) A catch pot

 (f) Cistern

(g) Full way valve

(h) Shut off valve 

(I) Drain valve

(k) Valve under test

Fig. 3 Diagrammatic representation of antisiphonage test apparatus

ANNEX E (Clauses  8.4)

FLOW TEST

E.1. Apparatus -  A Test rig (see Fig. 4) capable of maintaining 1 m head of water at the inlet of the valve under test comprising of a cistern connected through the necessary 15 mm copper pipe work to the specimen valve via a controlling gate valve.

E.2. Procedure - Fit the valve (installed with the LP seat) to be tested together with its discharge arrangement Cause the valve to discharge water from cistern A into container B for a period of 140 seconds while maintaining the water level in cistern a at a height of 1   m above the centre of the inlet of the valve for the duration of the test.

E.3. Result - At the end of 140 seconds, measure the volume of water in container B.

All dimensions in millimeters

Fig. Diagram of low pressure seat minimum flow test apparatus

ANNEX F (Clauses 8.5)

ENDURANCE TEST

F.1. Apparatus - Test equipment capable of operating the float arm or arm assembly to open fully and to close fully the valve on an automatic cycle.

A water supply to be maintained at 1.00 + 0.01m head.  The water temperature no to exceed 30°C.  A closure force equivalent to 10 N shall be applied at the end of the float arm or arm assembly.

F.2. Procedure - Install the float valve onto the test rig:

(a)  Fully open the valve in lot less than on second. (b)  Allow the valve to remain in the open position for 2 seconds (c) Fully close the valve in not less than one second. (d)  Allow the valve to remain closed for a maximum of 2 seconds

The foregoing shall constitute one cycle of not less than 6 seconds duration

ANNEX G (Clauses 8.6.)

METHOD OF TEST FOR EFFECT OF HYDRAULIC PRESSURE ON DISCHARGE ATTACHMENT

G.1. Apparatus - A cold water supply capable of providing a dynamic pressure of 1 Mpa installed with pressure gauge immediately upstream of the valve under test.

G.2. Procedure - Fit the valve to be tested with high pressure seat and its discharge arrangement.  Connect the valve under test to the apparatus and hold it in the fully open position. Gradually in crease the supply pressure to 1 Mpa.  Maintain this pressure for (6+1) seconds.

Record permanent deformation or separation of components,  if any.

Annexure 13-A.12

 SPECIFICATIONS FOR COPPER ALLOY FANCY SINGLE TAPS, COMBINATION TAP, ASSEMBLY AND STOP VALVES FOR WATER SERVICES – (Extract of BIS: 8931-1993)

1.  Scope - This standard lays down the requirements regarding materials, manufacture workmanship, constructions, dimensions, finish and testing of chromium plated copper alloy non-rising spindle type, fancy single taps, combination tap assembly and valves, suitable for operation from 0.1 Mpa to 0.5 Mpa pressure at maximum temperature of 65°C.

2.  References - The Indian Standards listed in Annex A. are the necessary adjuncts to this standard

3.  Terminology

3.0. For the purpose of this standard, the definitions given in IS: 10446-1983 shall apply in addition to the following.

3.1. Combination tap assemblies

3.1.1. Pillar mounting combination - The tap assembly with a vertical inlet and a nozzle arranged to discharge in downward direction (such as single hole and three hole combination tap assemblies for wash basin) and is suitable for mounting on a horizontal surface.

3.1.2. Wall mounting combination - The Tap assembly with a horizontal inlet and a nozzle arranged to discharge in a downward direction (such as bath and sink combination tap assemblies) and is suitable for mounting an vertical surface.

3.2. Angle stop valve - A valve with the inlet and outlet at right angles to each other and is intended to facilitate servicing of water fittings or appliances.

4.  Nominal sizes - The nominal size shall be designated by the nominal bore of the pipe outlet to which the taps valves are normally fitted.  The nominal size shall be as follows;

Pillar Tap

15mm

Bib tap

15mm

Combination tap assembly

15mm

Stop valve

15 and 20 mm

Angle stop valve

15 and 20 mm

5.  Material

5.1. Material used for different components / parts of taps and valves shall be in accordance with Table.1.

6.  Manufacture , workmanship and construction

6.1. General - Figures appearance in this standard are illustrative and do not specify design features.  However, dimensions as specified shall be complied with.

6.2. Casing shall in all respects be sound and free from defects like laps, blowholes and  pitting.  External and internal surfaces shall be clean, smooth and free from sand.  They shall be neatly dressed and no casting shall be burned plugged stopped and patched.

6.3. Forging shall be sound without lamination, smooth and well finished.

6.4. Plastic moulded knobs shall be sound and free from cracks, spots and blow holes.  However, shrinkage marks appearing due to moulding process are permissible on internal positions of the surface whereby these will not effect the appearance and performances of the knobs.

6.5. Machining - The body, bonnet, spindly and other parts shall be machined true, so that when assembled, the parts shall be axial parallel and cylindrical, with surface smoothly finished within the limits of dimensions specified for various components.

Table 1 Material for Components parts of single Taps, combination Tap Assemblies and valves

Sl.

No.

Component

Material

Indian Standard

1

Body , body components inlet tubes, nozzle , bonnet and back nuts

a) cast brass

b) die cast brass*

c) forged brass

d) leaded in bronze

e) brass tubes

f) brass rods

g) copper tubes

Grade CB 2 of IS:292-1983

Grade DCB2 of IS: 1264-1997

Grade FIB of IS: 6912-2005

Grade LTB 2 of IS: 318-1981

Type 1 Half hard of IS: 319-1989

IS 407-1981

Soft, annealed IS: 10773-1995

2

Flanges

a) cast brass

b) die cast brass*

c) forged brass

d) leaded in bronze

e) brass sheet

f) brass rods

Grade LCB 2 IS: 292-1983

Grade DCB 2 of IS: 1264-1997

Grade FLB of IS: 6912-2005

Grade LTB 2 of IS: 318-1981

Type 1 Half hard of IS: 319-1989

Grade Cu Zn 37 of IS: 319-1989

3

Spindle glands washer plates nuts, screws and pin

brass rods(extended or rolled)

forged brass

Type 1 Half hard of IS: 319-1989 

Grade FLB of IS: 6912-2005

4

Circlip, wire locks

a) phosphor bronze sheet

b) phosphor bronze wire

c) Stainless Steel

Grade III HE of IS: 7814-2005

IS 7608 : 1987

Grade I of IS: 4454 ( Part 4 )-2005

5

Oring

a) Synthetic rubber

IS: 9975 ( Parts 2 to 4 )-1984

6

Gasket and seat washer

a) Acrylo nitrille butadiene rubber

b) Neoprene rubber

c) Synthetic butadiene rubber ( S.B.R )

 

 

Grade 5 of IS: 7450-1974

7

Knob components deviator and deviator components

a)cast brass

b)die cast brass*

c)forged brass

d)leaded tin bronze

e) zinc base alloys

f)brass rods

g)Plastics

Grade LCB 2 IS: 292-1983

Grade DCB 2 of IS: 1264-1997

Grade FLB of IS: 6912-2005

Grade LTB 2 of IS: 318-1981

Type 1 Half hard of IS: 319-1989

IS:742-1981

Polyacetal, polypropylene, ARS (Acrylo Nitrille-Butadiene Styrene), Arcylics-Polymethyl - Methacrylates, Nylon - Polyamides)

* Conformity only with chemical composition to comply with

.6. Screw Threads

6.6.1. The inlets and outlet connection threads whether internal or external, shall be a pipe thread conforming to either IS; 554 -1985 or IS: 2643 (part 1 to 3)-1975.  This requirements does not apply to single hole combination tap assembly.

6.6.2. The threads on the spindle shall be trapezoidal or square conforming to IS: 7008 (parts 1 to 4)- 1988 and IS: 4694-1968 respectively.  The length of spindle threads shall be such that when the washer plate is resting on the seating without any washer, a length of thread equal to not less than 50 percent of the external diameter of the threaded portion of the spindle shall be in full engagement with the internal thread of the washer plate.

6.7. Waterway.

6.7.1.  Except where otherwise specified in this standard, the area of water way throughout the body of a tap or valve shall not be less than the area of a circle of diameter equal to the minimum bore of seating, specified in Table 2.

6.7.2. In any single outlet combination tap assembly the area of waterway through the individual tap shall be as specified in 6.7.1 up to combined outlet.  The internal diameter of a mobbing outlet shall not be less than 15 mm.  If the combined outlet is not circular it shall have an area of water way not less than the area of a circle diameter equal to 15 mm.

6.7.3. In a combination tap assembly with diverter for bath and shower the area of water way may be reduced below the bore specified in 6.7.1.

6.8. Flow straightening and aerating device - Taps may be fitted with these devices at the manufacture’s option.

Notes:

1. Flow straightening of the corrugated sleeve or moulded plastic may be incorporated at the outlet with in the nozzle of the tap.  It may be noted that straightness usually reduce the area of water way.

2. Flow straightening and aerating device which incorporate a multiplicity of small orifices, that is those contacting wire gauge or perforated plates shall be screwed type and be easily removable for cleaning purpose.  It should be noted that when aerators are fitted there is usually a reduction in flow.

6.9. Body seats

6.9.1. The seats may be integral with the body or may be separate renewable seat rings, screwed into   and shall have serration or slots or any other not less efficient device to facilitate renewal.  The area through the renewable seat ring shall be at least equal to a circle of diameter equal to the minimum bore of seating specified in Table 2.

Seating faces shall be finished smooth and edges shall be debarred.

6.9.2. The body shall be machined so that when the body and seat are assembled and secured in position they are co axial and the faces of seats and body are parallel.

6.10. Bonnet assembly - The surface forming the body to bonnet joint shall be machined smooth.  The joint may be with a gasket or an ‘O ‘ring.

6.11. Gland packing

6.11.1. Except as specified in 6.11.2. the gland  or stuffing box shall be packed with a suitable asbestos gland packing or other equally efficient packing material suitable for both cold and hot water.  A suitable washer may also be fitted in the bottom of stuffing box but this may be omitted if the packing is in the form of a moulded composition packing ring.

6.11.2.  When “ O “ rings are to be employed for the gland seal, a minimum of two rings shall be fitted in spindle or one each in spindle and washer plate unit and these shall be made of synthetic rubber.  They shall be capable of being renewed.

6.12. Flanges - Taps designed for mounting on the flat surfaces may have integral or separate flanges.

6.13. Knob - All knobs shall be close fit on a squared or serrated spindle.  The knob may be secure by a screw or using any other efficient device provided that the minimum cross-sectional area square for that size of spindle.  A non-metallic insert may be provided between knob and the spindle to restrict the heat transfer, when hot water is flowing.  No knob shall be screwed no to the spindle directly.

7. Dimensions

7.1. Minimum thickness - Except where a lesser thickness is specified, no point of body subjected to direct water pressure shall have a thickness less than 2.0 mm.  However, in the case of single tap and combination tap assemblies the open outlet nozzle portion may be reduced to 1.6 mm in case of castings and forging and to 0.6 mm when drawn tubes are used.

7.2. Body

7.2.1. The dimensions of body to bonnet connection and seat shall conform to the values specified in Table 2, read with Fig.1.

7.2.2. The seat edges shall be rounded off to avoid cutting edges.

7.2.3. Square or lugs on the shank under the flange of pillar tap know as locating future is an optical feature.  Where provided it shall not exceed the following dimensions:

Circumscribed diameter

Of location feature  - 29 mm

Depth of location feature

Under flange - 05mm

7.2.4. Dimensions of bodies of pillar taps and bib taps shall conform to those specified in table 3 read with Fig.3, and table 4 read with Fig.3 respectively.

7.2.5. Dimensions of bodies for stop valves including angle stop valves shall conform to those specified in Table 5, read with Fig. 4.

7.2.6. Dimensions of bodies for wall mounting shall conform to those specified in Table 6 read with Fig. 5 Dimensions of bodies of different types of pillar mounting combination tap assemblies shall conform to those specified in Table 7 read with Fig. 6 and in Table 8 read with Fig. 7.

Table 2 Dimensions of Body to Bonnet Connection

(Clauses 6.7.1, 6.9.1. and 7.2.1.)

Sl.

No.

Particulars (see Fig.1.)

Dimensions for nominal size

15

20

Min

Max

Min

max

1

Bore of seating 4

11.0

12.0

15.5

16.5

2

Thickness of metal supporting seat B

2.0

-

2.0.

-

3

Connection thread C

*G 1/2

* G3/4

4

Length of internal thread on Body D

9.0

-

9.0

-

5

Diameter of face of body E

25.0

-

31.0

-

6

Face of body to face of seating ,F

21.0

24.0

24.0

28.0

Table 3 Dimensions of Bodies for pillar tap, Size 15 mm (Clauses 7.2.4.)

Sl.No

Particulars (see Fig.2.)

Dimensions

Max

Min

1

Bore of inlet shank, A

-

14.5

2

Thread of inlet shank, B

*G1.2B

3

Diameter or size across flats, C

42

-

4

Horizontal length from center of body to center of outlet, D

80

-

5

Height from flange to center outlet, E

25

-

6

Length of thread ,F

42

-

7

Length of shank , G

50

-

8

Diameter of flange, H

38

-

9

Thickness of flange, J

2

-

10

Size across flats, K

25

-

11

Height of flats, L

7

-

Note: The nozzle may either be manufactured from cast or from wrought material (brass tube)

*Conforming to IS: 2643 (part 3)-1975

Table 4 Dimensions of Bodies for BTP Tap, size 15 mm (clauses  7.2.4)

Sl.

No.

Legend 

(See fig.3.)

Dimensions

Min

Max

1

A

*G1/2B/R1/2*

2

B

11

-

3

C

80

-

4

D

150

-

5

F

20

-

Note: The nozzle may either be manufactured from cast of from wrought material (brass tube)

  • Conforming to IS: 2643 (part 3)-1975 or IS: 554-1985

Table 5 Dimensions of Bodies for stop valve and angle stop valve (Clauses 7.2.5.) All dimensions in millimeters

Sl.

No.

Legend

(see Fig.4)

Dimensions for nominal size

15

20

 

 

Min

Max

Min

max

1

A

*G1/2Rp1/2*

*G3/4Rp3/4*

2

B

*G1/2B/R1/2*

*G3/4B/R3/4*

3

C

9

-

10.5

-

4

D

11

-

12

-

* conforming to IS: 2643 (part 3) -1975 / IS: 554-1985.

Fig.5. Bodies for wall mounting combination tap assembly (typical details)

Table 6 Dimensions of bodies for pillar mounting combination tap assembly, sizes 15 mm (Clause 7.2.6.)

Sl.No.

Particulars (see fig. 5)

Dimensions

Min

Max

1

Thread of inlet shank, A

*G1/2 B

2

Length of shank, B

25

-

3

Adjustment range of S-union, C

5

-

4

Diameter of range, D

50

-

5

Distance between centers of inlets, E

148

-

6

Length from flange to centre of spout, F

135

-

7

Length from flange to centre of spout, G

200

-

Note: the nozzle may either be manufactured from rough material (brass tube)

* conforming to IS: 2643 (part 3)-1975

Table 7 Dimensions of bodies for pillar mounting combination tap assembly, sizes 15 mm (Clause 7.2.6.)

Sl.No.

Particulars (see fig. 6)

Dimensions

Min

Max

1

Dimension of base from of body , A

21

31

2

Diameter of shank , B

-

29

3

Outer dimension, C

-

33.5

4

Smallest dimension of flange , D

42

-

5

Horizontal length from centre of body to centre of outlet, E

80

-

6

Height from flange to centre of outlet, F

25

125

7

Length of threaded shank, G

40

-

8

Depth of hexagon, H

7

-

9

Diameter of flange, J

42

-

10

Length of connection, K

350

-

11

Mean outside diameter of copper tube, L

9.5

-

12

Mean thickness of tube, M

0.6.

-

Notes:

  1. the nozzle may either be manufactured from cast or from wrought material (brass tube)
  2. the inlet tubes ,made of soft annealed copper tubes

Table 8 Dimensions of bodies for pillar mounting combination tap assembly, sizes 15 mm (Clause 7.2.6.)

Sl.No.

Particulars (see fig. 7)

Dimensions

Min

Max

1

Bore of inlet shank, A

-

14.5

2

Thread of inlet shank, b

G ½ B*

3

Length of external threaded shank, C

8

-

4

Height for tightening (adjustable), d

5

30

5

Diameter of shank, e

-

29

6

Smallest dimension of flange, F

42

62

7

Diameter flange, G

42

-

8

Distance between centers of inlet, H

195

210

9

Horizontal length from centre of body to centre of outlet, J

90

-

10

Height from flange to centre of outlet, K

25

125

11

Mean outside diameter of copper tube, L

9.5

-

12

Mean thickness of tube, m

0.6

-

Note: The nozzle may either be manufactured from cast or from wrought material (brass tube)

* conforming to IS: 2643(part 3)-1975.

Table 9 Dimensions of bonnet assembly (Clause 7.3.2.)

Sl.No

Particulars (see Fig. 8)

Dimensions

Min15

Max20

1

Diameter , A (min)

25

31

2

Thickness, B(min)

2.5

2.5

3

Diameter of seat washer, C(min)

15.6

20.6

4

Projection form edge of washer plate, D(min)(applicable for shrouded type only)

1

1

5

Thickness of seat washer, E(Min)

4

4

6

Length of closing thrust collar of bonnet, F (min)

2.0

2.5

7

Thread, G

*G1/2 B

* G3/4 B

8

Length , H(max)

9

9

9

Diameter of spindle, J(min)

7

9

10

Diameter of thrust collar, K(min)

11.8

13.8

11

Thickness of thrust collar, L(min)

1.5

1.5

12

Core diameter of spindle actuated thread, M(min)

6.0

8.0

13

Outside diameter of washer plate, N(max)

18.5

24

Notes:

* conforming to IS: 2643 (part 3-1975

7.3. Bonnet assembly

7.3.1. Spindle, bonnet washer plate and other parts shall be machined true, so that when assembled, the parts shall be axial, parallel and cylindrical with surface smoothly finished.

7.3.2. The dimensions of bonnet assembly shall conform to those specified in Table 9 read with fig. 8

7.3.3. Washer plate

7.3.3.1. The washer plate shall be shrouded or flat type, made from one piece and shall be machined all over.

7.3.3.2. The part of washer plate that prevents turning shall be either two flats, a square, a hexagon or any other shape that prevents turning.

7.3.3.3.The seat washer shall be inserted in washer housing.  The connection between the seat washer and its housing shall ensured by a screw, a nut or any other means that ensures the firm seating of the washer in its place.

7.3.3.4. The minimum lift of washer plate with washer in position shall be 3.5. mm and 5.0. mm respectively for 15 and 20 nominal bore taps and valves.

7.3.4. The seat washer shall be suitable for heat resistant applications.  Basic polymer (SBR or Neoprene) shall be used in their manufacture.

8. Finish

8.1. The significant surfaces of taps combination tap assembly and stop valves shall be nickel-chromium plated.  However, the body of concealed stop valve and side stop valve of pillar mounting combination tap assembly may be polished bright or may have an unpolished surface, as ‘ Cast ‘ Finish.

8.1.1. Definition of significant surfaces - Significant surfaces are all parts of the article (taps, valves and combination tap assembly) covered or to be covered by the coating and for which the coating is essential for serviceability and / or appearance of the fitted article.  For example, internal suffuses of hollow parts such as cross pieces, caps knobs are not deemed significant.

8.2. The taps and valves shall be nicklechromium plated complying with service grade No. 2 of IS: 4827-1983.

8.3. The knobs and knob components of plastic material may be used in as moulded finish, or nickel chromium plated complying with service grade No. 2 of IS: 8376-1988.

8.4. The knobs and knob components of zinc base alloy shall be nickel chromium plated complying with service grade No 2 of IS: 4828-1983.

9. Testing

9.1. Material test - Material tests required shall be those given in corresponding material specifications referred in Table.1.  The material shall be either certified by the suppliers with regard to their compliance to specifications laid dawn fir them and /or test shall be made to ascertain their compliance with the relevant specifications before use.

9.2. Performance Test - All taps and valves shall be capable of complying with the test specified in 9.2.1. to 9.2.4.   The test specified is laboratory tests and not quality control tests during production.

9.2.1. Water tightness characteristic

9.2.1.1. This test consists of checking under cold water pressure or under air pressure the water tightness of bonnet assembly on seat, tap and valve upstream, taps and valve downstream and bath/ shower deviators whether manual or automatically operated.

9.2.1.2. The test under cold water pressure and air pressure are considered to be equivalent.  The choice between one or the other method should be agreed between purchaser and test laboratory.

9.2.1.3. Throughout the duration of either water test of air test under water, there shall be no leakage of water or escape of air bubbles respectively, through the walls of the body, the bonnet and the deviator assembly.

9.2.1.4. The test equipment duration and procedure as specified in Annex B shall be followed.

9.2.2. Pressure resistance characteristic

9.2.2.1. This test consists of revealing any deformation in the tap and valve that may result under the action of cold water at a relatively high pressure.  The test shall be carried out upstream and downstream of the taps and valves.

9.2.2.2. Criteria for conformity shall be that no permanent deformation in the part of the taps and valves situated upstream or downstream shall be produced.

9.2.2.3. The test equipment procedure and duration as specified in Annex C shall be followed,

9.2.3. Hydraulic characteristics (flow Rate)

9.2.3.1. This test is performed to determine the value of the flow rate corresponding to reference pressure equal to 0.3. Mpa. The measurement is carried out with taps and valves fully open.  If it is fitted with flow straightening or aerating device the same may be removed for the purpose.

9.2.3.2. The value of flow rate shall not be less than

(a) 12 1/min for 15 mm nominal size single and combination tap and valve (b) 23 1/min for 20 mm nominal size.

9.2.3.3. Mechanical strength characteristics

9.2.3.4. Mechanical Strength characteristics

9.2.4.1. This test is performed to verify the torsion strength of operating mechanisms (bonnet assembly) to a torque of 6 Nm, in both opening and closing positions.

9.2.4.2. The required torque of 6 Nm shall be applied and maintained for a period of 5 minutes either with a torque wrench, having an accuracy of 10 percent, fitted to operating member or a lever arm and device for measuring the force applied.  The shall be assured that shear force does not affect the measurement.

9.2.4.3. The tap with its operating mechanism (bonnet assembly) shall not be supplied with water during the test.

9.2.4.4. Throughout the duration of test and at the end of test there shall be no permanent deformation or loosing of any part of the tap and valve.

10. Sampling and criteria for conformity - The Sampling procedure to be adopted and criteria for conformity shall be as given in Anne. E.

11. Marking

11.1. Each pillar tap, bib combination tap assembly , stop valve and angle stop valve shall be legibly marked with the following information:

(a) Manufacturer’s name or trade mark

(b) Letter ‘ H “  or “C” or alternatively fire red or blue colour for taps meant for hot water or cold water application.  In the case of combination tap assembly, the hot water shall be on the left and cold water on the right.

c) Direction of flow in case of stop valves

11.1.1. Nominal size of taps and valves shall be given on the carton / packing.

11.2. Each pillar tap, bib tap, combination tap assembly, stop valve and angle stop valve may also be marked with standard / Mark.

ANNEX A (Clause 2.1.)

LIST OF REFERRED INDIAN STANDARDS

IS NO.

TITLE

292 :1983

Specification for leaded brass ingots and castings

318:1981

Specification for leaded tin bronze ingots and castings

319:1989

Specification for free cutting leaded brass bars, roads and sections

407:1989

Specification for brass tubes for general purpose

410:1977

Specification for cold rolled brass sheets, strip and foil

554:1985

Dimensions for pipe threads where pressure – tight joints are made on threads

742:1981

Specification for zinc base alloys die casting

781:1984

Specification for cast copper alloys screw down bib taps and stop valves for water services

1264:1989

Specification for brass gravity die castings (ingots and castings)

1795:1982

Specification for pillar taps for water supply purpose

2643 : 1975

Dimensions for pipe threads for fastening purpose

4454 (part 4): 1975

Steel wires for cold formed springs : part 4 stainless spring steel wire for normal corrosion resistance (first revision)

4694 : 1968

Basic dimension of square threads

4827:1983

Electroplated coatings of nickel and chromium on copper and copper alloys

4828:1983

Electroplated coatings of copper nickel and chromium on zinc alloys

4905:1986

Methods for random sampling

5192:1975

Specification for vulcanized natural rubber based compounds

6912:1975

Specifications for copper and copper alloys forging stock and forgings

6912:1985

ISO metric trapezoidal screw threads : Part I Basic profile and maximum material profile (first revision)

7008(part 1) :1988

ISO metric trapezoidal screw threads: Part 2 Pitch diameter  combinations (first revision)

7008(part 2):1988

ISO metric trapezoidal screw threads: Part 2 Pitch diameter  combinations (first revision)

7008(part 3):1988

 ISO metric trapezoidal screw threads :Part 3 Basic dimensions (first revision)

7008(part 4):1988

ISO metric trapezoidal screw threads: part 4 Tolerances (first revision)

7450 : 1974

Specification for vulcanized styrene – butadiene rubber (SBR) based compounds

7608 :1975

Specification for phosphor bronze wire (for general engineering  Purposes)

7814 : 1985

Specification for phosphor bronze sheets and strip

8376 : 1988

Electroplated coatings of nickel and chromium on plastics for decorative purpose

9844:1981

Method of testing corrosion resistance of electroplated and anodized of electroplated and anodized aluminum coatings by neutral salt spray test

9975 :1981

Specification for “O” rings

10446 : 1983

Glossary of terms relating to water supply and sanitation

10773:1983

Copper tubes for refrigeration purposes

Annex B (Clause 9.2.1.4.)

WATER TIGHTNESS CHARACTERISTICS

B.1. General - This annex specifies test methods to verify the water tightness of the complete taps and valves specimen.

B.2. Test equipment

B.2.1. For water test - The hydraulic test circuit shall be capable of producing the static and dynamic pressures required and maintaining them for the duration of the test.

B.2.2. For air test under water - Thank filled with water and its accessories.  Pneumatic circuit that can deliver the required pressure and maintain it for the duration of the test.

B.2.3. For automatic diverter - A flow rate regulator having a nominal flow of 15.0 (minimum 13.5.) litre per minute at a dynamic pressure of 0.3 Mpa.

B.2.4. Test duration -  The periods given are minimum periods

B.3. Procedure for checking the waterightness of the bonnet assembly on the seat, and the water tightness of the taps and valves upstream.

B.3.1.Water test.

i) Connect the tap/valve specimen to the test circuit

ii) With the outlet orifice open generally turned downwards, close seat (bonnet assembly) using a torque of 1.5. Nm.

iii) Apply water pressure of 1.6. Mpa for 60s.

Note: When the water rightness of the spindle is ensured by a stuffing box, the packing gland is loosened.

B.3.2. Air test under water.

1) Connect the tap/ valve specimen to the test circuit

2) With the outlet orifice open and generally turned upwards, close the seat (bonnet assembly) using a torque of 1.5. Nm.

3) Completely immerse the tap/ valve specimen in water contained in tank.

4) Apply an air pressure of 0.6 Mpa to the tap/valve specimen for 20s.

Note: If the water tightness of the spindle is ensured by a stuffing box, the packing gland is loosened.

B.4. Procedure for checking the water tightness of the taps and valves downstream

B.4.1. Water Test.

1)  Connect the tap / valve specimen to the test circuit.

2) With the outlet orifice closed and generally trued downwards, open the seat (bonnet assembly)

3) Apply to the tap/valve specimen, a water pressure of  0.4 Mpa for 60s.

4) In addition, for tap and valve where the water tightness of the spindle is ensured by one or more O rings, apply a water pressure of 0.02 Mpa for 60s.

5) In the latter case, being by applying 0.4 Mpa gradually reducing down to the test pressure of 0.02 Mpa.

B.4.2. Air test under Water.

(1) Connect the tap/valve specimen to the circuit.(2) With the outlet orifice closed.(3) Immerse the tap valve specimen in water contained in the tank.(4) Apply an air pressure of 0.2 Mpa for 20s. (5) In addition, for taps and valves where the waterightness of the spindle is ensured by one or more O –rings, apply an air pressure of 0.02 Mpa for 20.s. (6) In the latter case begin by applying 0.2 Mpa gradually reducing down to the test pressure of 0.02 Mpa.

B.5. Procedure for checking the water tightness manually operated diverters

B.5.1. Water Test.

1) Connect the tap in its normal position of use, to the test circuit

2) Put the diverted in the bath position, the bath outlet being artificially closed and shower outlet being open and generally turned downwards.

3) Apply a static water pressure of 0.4. Mpa for 60.s check that water tightness it maintained on the shower side

4) In addition when the water tightness of diverter is ensured by one or more rings, apply a static water pressure of 0.02 Mpa for 20.s.  In the latter case,  by applying the highest pressure, then gradually reducing down to the lowest pressure of 0.02 Mpa.  Check that water tightness is maintained on the shower side.

5) Put the diverted in the shower position the shower outlet being artificially closed and the bath outlet being open the generally turned downwards.

6) Apply a static water pressure of 0.4 Mpa for 60.s.  Check that water tightness is maintained on the bath side.

7) In addition, if the waterightness of the diverter is ensured by one or more O rings, apply a static water pressure of 0.02 Mpa for 20s.  In the latter case, begin by applying the highest pressure, then gradually reducing down to the lowest pressure of 0.02 Mpa.  Check that water tightness is maintained on the bath side.

B.5.2. Air test under water.

1) Connect the tap in its normal positions of use to the test circuit

2) Place the diverter in the bath position, with the bath outlet being artificially closed and shower outlet being open generally turned upwards.

3) Immerse the tap in the water contained in the tank

4) Apply a static air pressure of 0.2. Mpa for 20s. Check that water tightness is maintained on the shower side.

5)  In addition when the water tightness of diverter is ensured by one or more O rings , apply a static water pressure of 0.02 Mpa for 20.s.  In the latter case, being by applying the highest pressure, then gradually reducing down to the lowest pressure of 0.02 Mpa.  Check that water tightness is maintained on the shower side.

6) Put the diverted in the shower position the shower outlet being artificially closed and the bath outlet being open the generally turned upwards.

7) Immerse the tap in the water contained in the tank.

8) Apply a static water pressure of 0.4. Mpa for 60s. Check that water tightness is maintained on the bath side.

9) In addition, if the water tightness of the diverter is ensured by one or more O rings, apply a static water pressure of 0.02 Mpa for 20s.  In the latter case, begin by applying the highest pressure, then gradually reducing down to the lowest pressure of 0.02 Mpa.  Check that water tightness is maintained on the bath side.

B.5.3. Procedure for checking the water tightness of automatic diverters

(The test shall be carried out with water only)

1) Connect the tap, in its normal position of use, to the test circuit with outlet orifices open and generally turned downwards.  Connect the flow regulator (see B.2.3.), to the shower outlet.

2) Put the diverter in the bath position, and apply a dynamic water pressure of 0.4 Mpa for 60s.  Check that water tightness is maintained on the shower side.

3)  Put the diverter in shower position, check that waterightness is maintained on the bath side.

4) With the diverter still in shower positions, reduce the dynamic pressure to 0.05 Mpa.  Check that the diverter has not disengaged.  Maintain this pressure for 60 s and check that water tightness is maintained on the bath side.

5) Stop the water, check that the diverter returns to the bath positions.

ANNEX C (Clause 9.2.2.3.)

PRESSURE RESISTANCE CHARACTERISTICS

C.1. General - This annex specifies the test method for checking the mechanical behavior with cold water of the body of the taps and valves and lays down the test criteria.

C.2. Test equipment - Use a hydraulic test circuit capable of producing the static and dynamic pressures required and of maintaining them for the test duration.

C.3. Procedure for checking of mechanical behaviour upstream seat (bonnet assembly) in shut position - Apply for 60s. a static water pressure of 2.5 Mpa.

C.4. Procedure for checking the mechanical behaviour downstream, seat (bonnet assembly) in open position - Apply for 60s a dynamic water pressure of 0.4 Mpa, this pressure being measured at the junction of the tap and the pipe.  Carry out the test on the tap and valve as supplied.  For taps containing a removable aerating device in the nozzle carry out an additional test with the device removed.

ANNEX D (Clause 9.2.3.3.)

HYDRAULIC CHARACTERISTICS

 D.1. General - This annex specifies the test method which enables the flow rate of single and combination taps and valve together with their standard accessories to be measured for a given pressure.

D.2. Apparatus (See fig.9.) - The apparatus consists of a supply circuit and a test circuit.

D.2.1.The supply circuit assembly consists of:

a) A device ( A) enabling the required pressure to be achieved;

b) Piping (B) with a cross section such that the test circuit without the tap and valve to be tested, enables a flow rate of 50 percent greater than the flow rate to be measured to be achieved.

c) A device (c) to measure the flow rate.

Note: This device may also be placed downstream of the test circuit, provided it is separate from the test circuit.

D.3. Test Circuit (See Fig. 10) - The circuit shown in Fig. 10 is suitable whatever the type of the tap and valve to be tested.  It consists of

1) A straight portion of tube, having a minimum internal diameter 13 mm and 19 mm for 15 and 20 nominal size of taps and valve respectively, with a pressure tapping, as shown in Fig. 10.

2) A tap and valve connecting nut or socket of suitable size.

3) A pressure circuit , connected to the pressure take off tee and to the pressure measuring device.

Note: The connection between the pressure circuit and measuring apparatus is situated.

a) At the connection level, for all taps (fig. 10 a and 10c) except for tap with combined visible bodies and all mixers with copper inlet pipe of 250 mm minimum length (fig. 10b)

b) 200 mm above the connection level for all types of tap

Example of the fitting of the tap and valve to the test ciruit is shown in Fig.10.

D.3.1. Pipes - The pipes shall be of metal and their internal surface shall be smooth.

D.3.2. Pressure take off tee - The pressure take off tees shall be made of brass and machined to the dimension as specified in Table 10.

D.4. Test conditions

D.4.1. Precision of the measurements - The precision of the device for measuring the flow rates and pressures shall be ± 2 percent.

D.4.2. Procedure

D.4.2.1. Fit the tap and valve to be tested onto the test circuit.

D.4.2.2. For combination taps with tap inlets the test shall be carried out on each of these inlets separately.

D.4.2.3. For combination tap with combined visible body, reduce, if necessary the length of the supply tubes to a value of 250 mm.

D.4.2.4.   For the taps and valves which cannot be connected directly to the test circuit connector, use intermediate connecting device which have minimum head loss.

D.4.2.5. Open the valve to its maximum.

D.4.2.6. Supply the test circuit and adjust the dynamic pressure to 0.3 Mpa.

D.4.2.7. When a stable continuous flow has been established, measure the corresponding flow rate.

D.4.2.8. For greater accuracy, the following procedure is recommended:

a) Carry our several measurements of the flow rate at different values of pressure (for example between 0.1 Mpa and 0.5 Mpa)

b) Using logarithmic coordinates, plot the curve of the flow rate (Q) as a function of the pressure (P).

c) Determine on this curve the value of the flow rate corresponding to the pressure of 0.3 Mpa.

D-5. Calibration - It is recommended that the measuring appliances and the test circuit be calibrated at regular intervals.

Table 10 Dimensions of pressure take off tee

Nominal size

Thread size A*

( All dimensions in millimeters )

Legends ( see Fig. 11)

Width ac ross flats

Bolts

B

C

D

E

F

G

H

J

K

L

M

N

O

S

No.

size

15

G

1/2

13

34

55

21

31

43

59

27

8

12-5

12

15

1-5

27

4

M4x16

20

G

3/4

19

41

62

26

38

50

66

29

10

12-4

14

17

0-6

32

4

M5x16

ANNEX E (Clause 10)

SAMPLING AND CRITERIA FOR CONFORMITY

E.1. Scale of sampling

E.1.1. Lot - In any consignment , all the items (pillar taps) bib taps combination tap assembly , stop valves and angle stop valves made of the same material, of the same nominal size and from the same batch of manufacture shall be grouped together to constitute a lot.

E.1.2. For ascertaining the conformity of material in the lot to the requirements of this specification, sampling shall be tested from each lot separately.

E.1.3. The number of items to be selected from the lot shall depend on the size of the lot and shall be according to table 11.

Table 11 Scale of Sampling and Criteria for conformity

No. of taps and valves in the lot

Sample

Size

 

Acceptance

 Number

 

Sub – Sample

 

Up to 150

8

0

8

151 to 300

13

0

13

301 to 500

20

1

13

501 to 1000

32

2

20

1001 to 3000

50

3

32

3001 and above

80

5

32

E.1.3.1. These items shall be selected at random from the lot, in order to ensure randomness of Selection, procedures given in IS: 4905-1968 may be followed.

E.2. Number of tests and criteria for conformity

E.2.1. All the taps and valves selected according to E.1.3 shall be examined for material (5.5.1.), manufacture, workmanship and construction (6), dimensions (7), and finish (8)   A sample item failing to satisfy one or more of these requirements shall be considered as defective.

E.2.2.1. The lot shall be considered to have satisfied these requirements if the number of defective items found in the sample is less than or equal to the corresponding acceptance number given in Col. 3 of Table 11.

E.2.2. The lot having been found satisfactory according to E.2.1. shall be further tested for performance test specified under 9.2.  for those purpose as sub sample of taps and vales given in Col.4. of Table 11.  Shall be take and subjected to these tests.  The number of items required in the sub – sample may be take from those already examined and found satisfactory according to E.2.1.

E.2.2.1. The lot shall be considered to have satisfied the requirements for these tests if none of tap and valves in the sub – sample fails in any of these tests.

Annexure 13-A.13

SPECIFICATIONS FOR SWING CHECK TYPE REFLUX (NON-RETURN) VALVES FOR WATER WORKS PURPOSE PART 2 MULTI–DOORS PATTERN

 (Extract OF BIS: 5312 (Part 2)-1986)

1.  Scope

1.1. This standard (part 2) covers requirements for flanged reflux valves of multi door swing check type used for water works purpose of sizes from 400 to 1200 mm.

2.  Class of valves

2.1. Class of reflux valves shall be designated by nominal pressure (PN), defined as the maximum permissible gauge working pressure in Mpa, as follows:

P N 0.6. and P N 1

3.  Nominal sizes

3.1. The valves shall be of the following nominal sizes:

400,450, 500,600, 700, 750,800,900, 1 000, 1 100, and 1200 mm

3.1.1. The nominal size shall refer to the nominal bore of the water way.

3.2. Typical illustration of swing check type reflux valve is given in Fig.1.

4.  Materials

4.1. The materials used for the manufacture of different component parts of values shall conform to the requirements given in Table 1.  where alternative materials are specified in Table 1, these may be used with the approval of the purchaser.

5. Body ends

5.1. Flanged body ends

5.1.1. Unless otherwise specified in the contract or order, dimensions shall comply with the requirements of IS: 1538 (Part 4)-1976* and IS: 1538 (Part 6)-1976 † is 1538 (Part 5)-1976 ‡.

5.2. Flanges shall be drilled unless otherwise specified and bolt holes shall be off centers.

* Specification for cast iron fittings for pressure pipes for water gas and sewage; part 4 specific requirements for flanges of pipes and fittings (second revision).

 † Specification for cast iron fittings for pressure pipes for water, gas and sewage; part 6 specific requirements for standard flange drilling of flanged pipes and fittings (second revision)

† Specification for cast iron fittings for pressure pipes for water gas and sewage; part 5 specific requirements for raised (second revision)

Table 1 Materials for different component parts of reflux valves

(Clause 4.1)

Sl

No

Component

Basic materials

Alternative materials

Material

Ref. To IS:

Grade or    Designation

Material

Ref to IS:

Grade or       Designation

i

Body with hinge and diaphragm

Grey cast iron

IS:210-1993

FG 260

a) S.G. iron

b) Cast steel

IS:1865-1991

IS:1030-1998

400/12 Grade B

ii

Hinge pin

High tensile brass

a) IS:320-19804

b) IS:6912-2005

HT  2

FHTB 1

Stainless steel

a) IS: 6603-2001

b) IS:1570 (Part 5) -1985

04 Cr 17 Ni 12 Mo 2 or 04 Cr 18 Ni 10

iii

Bolts

Carbon steel

IS:1367-2002

Class

4-6

-

-

-

iv

Nuts, nuts for hinge pins

Carbon steel

IS:1367 (Part 6) -1994

Class 4

-

-

-

v

Bearing bushes

Leaded tin bronze

IS:318 - 198110

LTD 2

a) Austenitic iron

b) PTFE / Reinforced PTFE

IS : 2749-197411

 

       -

ASGN : 20

 

-

vi

Face and seat rings

Leaded tin bronze

IS : 318-1981 10

LTD 3

a) Austenitic stainless steel

 

b) Stainless steel

IS : 6603-2001

 

 

IS:1570 (Part 5) -1985

04 Cr 17 Ni 12 Mo 2 or

04 Cr 18 Ni 10

12 Cr 13

 

vii

Flange jointing material

Rubber

IS : 638-1979 12

-

-

-

-

1.  Specification for grey iron castings (third revision)

2.  Specification for iron castings with spheroidal or nodular graphite (second revision)

3.  Specification for carbon steel castings for general purposes (third revision)

4. Specification for high tensile brass rods and sections (other than forging stock) (second revision)

5. Specification for copper and copper alloy forgings (first revision )

6. Specification for stainless steel bars and flats.

7. Specification for stainless and heat resisting steels ( first revision )

8. Technical supply conditions for threaded steel fasteners: Part 3 Mechanical properties and test methods for bolts, screws and studs with fully leadability ( second revision )

9. Technical supply conditions for threaded steel fasteners: Part 6 Mechanical properties and test methods for nuts with specified proof loads ( second revision )

10. Specification for leaded tin bronze ingots and castings (second revision)

11. Specification for austenitic iron castings (first revision)

12. Specification for sheet rubber jointing and rubber insertion jointing (second revision)

5.3. The dimensions of the valves shall be given in Table 2.

Table 2 Dimensions of valves (Clause 5.2. and Fig.1.)

All dimensions in millimeters

Size

Length over flanges (A)

Overall Height(B)

Height of Center from Duck Foot (C)

Size of Duck foot (E X F)

500

815

1150

600

200 X 250

600

941

1333

685

254 X 254

700

1000

1446

750

300 X 375

750

1045

1446

750

300 X 375

800

1118

1634

850

300 X 375

900

1250

1570

815

300 X 375

1000

1250

1730

915

300 X 375

1100

1396

2069

1080

400 X 450

1200

1500

2250

1175

400 X 450

5.4.   The tolerances on the face – to – face dimensions shall be as follows:

Face-to-face dimensions  Tolerances

400 mm  ± 2 mm

Above 400 mm up to including 600 mm ± 3 mm

Above 600 mm up to including 800 mm ± 4 mm

Above 800 mm up to including 1000 mm            ± 5 mm

6.  Design and manufacture

6.1. Body - The body may be made in two parts inlet shell and outlet shell.  The inlet shell shall have duck foot support.

6.2. Diaphragm - Diaphragm shall be fitted between inlet and outlet shells.The parts in the diaphragm should be so designed as to induce minimum headless in the flow through the valve.

6.3. Water way area - The area of the water way through the multi doors in the diaphragm shall not be less than the bore area except that this area may be reduced by not more than 15 percent for any proprietary designs.

6.4. Inlet and outlet shell connections - The attachment of the inlet to outlet shell of the body shall be adequate to withstand the appropriate test pressures, service conditions and the mechanical loads encountered in the operation.  All valves shall have bolted connection size of the bolts or studs shall not be less than 22 mm.

6.5. Seats - Seat rings shall be so fitted as to avoid their becoming loose in service.  Standard countersunk screws shall not be used.

6.6. Door - The door shall be integral with the hinge and shall have a flat seating face.

6.7. Lugs – Suspension lugs shall be cast integrally on the diaphragm plate and shall be of adequate strength.

6.8. Number of Doors - The minimum number of doors (discs0 in the diaphragm plate shall be two.

6.9. By – Pass Connection – By passes are not standard items on valves to the design but if required, it is recommended that they shall be made for connection between the inlet and outlet shell of the valves.  By passes shall conform to PN 1 of IS: 780-1984* and the minimum size of the by pass arraignment shall as indicated below

Size of Values

Min, Size, of by pass arrangements

400 mm

50 mm

450 mm to 600mm

80mm

700 mm to 1200mm

100mm

6.10. Mass of Valves - The minimum finished mass of the values shall be as follows

Nominal Size of Values (mm)

 Min mass (kg)

500

1450

600

2040

700

2250

750

2450

800

2540

900

3480

1000

4000

1100

5100

1200

6000

* specification for sluice valves for water works purpose 50 to 300 mm size (sixth revision)

7.  Coating

7.1.   Immediately after casting and before machining all cast iron parts shall be thoroughly cleaned, and before rusting commences, shall be coated by dipping in a bath containing a composition having a tar base and maintained at temperature between 143 and 166°C.  The proportions of the ingredients shall be so regulated as to produce a coating having properties specified in 7.3.

Note –1 The valves may be assembled without coating if the purchasing organization specially desires to inspect the assembled valves without any coating.

Note:2 From every bath one piece of smallest size and one piece of largest size should be tested for coating.  Alternatively, for tar based paints the representative test piece 150 x 100 x 10 mm shall be subjected to coating test from each bath.

7.2.   Casting shall be re- heated before dipping , either by immersion in hot water or by heating in an over, or shall be held in the dipping box sufficiently long to reach an equivalent temperature, the method used being at the maker’s option.  Care shall be taken to see that the coatings are perfectly dry immediately before dipping.  On removal from the box, the casting shall be sufficiently drained.

7.3. The coating shall be such that it shall not impart any taste or smell to water.  The coating shall be smooth, glossy and tenacious sufficiently hard so as not to flow when exposed to a temperature of 77 °C and not so brittle at a temperature of 15°C as would chip off when screeched lightly with the point of a pen knife.

7.4. Alternatively, two coats of black Japan conforming to Types 3 of IS: 341-1973* or paint conforming to IS; 9862-1981 † shall be applied.

8. Testing

8.1. Before coating each valve shall be subjected to hydrostatic test given in 8.2 and 8.3 tests shall be carried out with water.  Test pressures and duration of test shall be as specified in table 3.

Table 3 Test pressure (gauge) and test duration of valves

Pn rating of valve

Test

Test pressure (Gauge), Min Mpa

Test duration Min Minutes

PN 0.6.

Body Test

Seat Test

0.9

0.6

2

2

PN 1

Body Test

Seat Test

1.5.

1.0

2

2

* Specification for black Japan Types A, B and C (first revision)

† Specification for ready mixed paint, bituminous, black, lead-free acid alkali, water and chlorine resisting

8.2.   Seat test - The valve shall be placed in the horizontal position and the outlet end shall be filled with water completely.  With the inlet end open to atmosphere,  there shall be no leakage when the outlets end of the valve is subjected to hydrostatic, non – chock seat test pressure as given in Table 3 for two minutes.  There shall be no leakage of water through the seats.

8.3. Body test - Water shall be filled completely in the body.  When the body is subjected to hydrostatic, non-shock body test pressures given in Table 3 for two minutes there shall be no leakage or permanent distortion of any component part under this test.

9.  Inspection

9.1. If required, all valves shall be tested hydrostatically by the purchaser or his autopsied representative at manufacturer’s works.  If additional tests are required by the purchaser, the same shall be clearly mentioned in the inquiry as well as in the order.  The purchaser or his authorized representative shall have access to the manufacturer’s works at all reasonable times to inspect the assembled valves to his order.

10.  Preparation for despatch

10.1. After testing all valves shall be drained, cleaned, prepared and suitably packed for dispatch in such a way as to minimise the possibility of damage and deterioration during transit and storage.

10.2. The doors shall be secured for trains to prevent hammering on the body seats.

10.3. When specified body ends shall be suitably sealed to exclude foreign matter during transit and storage.

11.  Information to be supplied by the purchaser

11.1. The following information shall be supplied by the purchaser along with order:

(a)  Nominal size of valve required; (b) Class of valve required; c) If possible, should mention the specific purpose for which the valve is required or any specification of the material; (d) By pass arrangement, if required;(e) Whether test certificate required; (f) Inspection or witnessing of test or certificate of conformity; and (g) Whether body ends should be sealed for dispatch,

12.  Marking

12.1. The following information shall be cast on each valve body in raised letters or on a plate securely fixed to the body;

(a)  The manufacture’s name (b) Size of value(c) Nominal pressure in Mpa (see 2.1.), and (d)  Direction of flow

12.1.1. Each value may also be marked with the Standard Mark.

Note: The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act., 1986 and the Rules and Regulations made there under.  The Standard mark on products covered by an Indian Standard covers the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer, Standard marked products are also continuously checked by BIS for conformity to that the use of the Standards Marking may be greatened to manufactures or producers may be obtained from the Bureau of Indian Standards.

*****