GUIDELINES FOR FACTORY INSPECTION OF MS PIPES (IS: 3589:2001)
1) Marking
Each Pipe shall be legibly marked with the following details :
a) Indication of the source of manufacturer name or Trade mark.
b) Outside diameter and specified wall thickness.
c) Pipe designation.
2) Sampling (Physical Dimensions)
| No. of pipes in the Lot | Pipes or tubes (Outside dia ≤ 200 mm) | Others | ||||
| Sample size |
Acceptance number |
Sample size | Acceptance number | |||
|
Up to 100 |
3 |
0 |
2 |
0 |
||
|
101 to 150 |
5 |
0 |
3 |
0 |
||
|
151 to 300 |
8 |
0 |
5 |
0 |
||
|
301 to500 |
13 |
0 |
8 |
0 |
||
|
501 to 1000 |
20 |
1 |
13 |
0 |
||
|
1001 to 3000 |
32 |
2 |
20 |
1 |
||
|
3001 to 10000 |
50 |
3 |
32 |
2 |
||
|
10001 and above |
80 |
5 |
50 |
3 |
||
Sampling (Physical Tests)
|
No. of pipes in the lot |
Sample Number |
Sampling size of each sampling test |
Acceptance Number |
Rejection Number |
|
301 to 800 |
First |
5 |
0 |
2 |
|
second |
5 |
1 |
2 |
|
|
801 to 3000 |
First |
8 |
0 |
2 |
|
second |
8 |
2 |
3 |
|
|
3001 and above |
First |
13 |
1 |
3 |
|
second |
13 |
3 |
4 |
Note :The sampling criteria for lot size less than 300 mm acceptance as agreed to between the purchaser and teh supplier.
3) Designation of the Grades of the Pipes :
|
Method of Manufacture of Pipe |
Steel Grades Applicable |
||
|
Seamless |
Fe330 |
Fe410 |
Fe450 |
|
ERW |
Fe330 |
Fe410 |
Fe450 |
|
SAW |
Fe330 |
Fe410 |
Fe450 |
4) Physcal Dimensions :
Mass: Mass per meter run of the pipes can also be worked out by the formula as under
M = (D-T) xTx0.0246615
Where, M- Mass of the pipe Kg/m
D-Nominal Outside Dia of the tube, mm
T- Nominal thickness of the tube, mm
The tolerance of mass per cart load f 10 tones or above shall be ± 705 percent on the nominal theoretical mass of the tubes.
Outside Diameter :
|
Outside Diameter (For all sizes) |
Tolerance |
|
For seamless pipes |
± 1% |
|
For ERW & SAW pipes |
± 0.75% |
Wall Thicness :
|
Outside Diameter (For all sizes) |
Tolerance |
|
For ERW pipes |
± 10% |
|
For SAW& seamless pipes |
+20%, -12.5% |
Length :
The permissible variation shall be -0, +10 mm for length up to and including 6 m.
5) Chemical Properties
| Steel Grade | Method of Manufacture | Chemical Composition | ||||
| C (Max) | Mn (Max) | P (Max) | S (Max) | CE (Max) | ||
| Fe330 | Seamless(S) | 0.16 | 1.2 | 0.04 | 0.04 | -- |
| Fe330 | ERW | 0.16 | 1.2 | 0.04 | 0.04 | -- |
| Fe330 | SAW | 0.16 | 1.2 | 0.04 | 0.04 | -- |
| Fe410 | Seamless(S) | 0.2 | 1.3 | 0.04 | 0.04 | 0.45 |
| Fe410 | ERW | 0.2 | 1.3 | 0.04 | 0.04 | 0.45 |
| Fe410 | SAW | 0.2 | 1.3 | 0.04 | 0.04 | 0.45 |
| Fe450 | Seamless(S) | 0.25 | 1.2 | 0.04 | 0.04 | 0.45 |
| Fe450 | ERW | 0.25 | 1.2 | 0.04 | 0.04 | 0.45 |
| Fe450 | SAW | 0.25 | 1.3 | 0.04 | 0.04 | 0.45 |
6) Mechanical Properties :
|
Steel Grade |
Method |
Tensile Strength (MPa) min |
Yield Stress (MPa) min |
Elongation Percent min |
|
Fe330 |
ERW, Seamless and SAW |
330 |
195 |
20 |
|
Fe410 |
ERW, Seamless and SAW |
410 |
235 |
18 |
|
Fe450 |
ERW, Seamless and SAW |
450 |
275 |
15 |
7) Hydraulic Pressure Test :
Each pipe shall be hydraulic tested at the manufacturer’s works before the pipe is coated, wrapped and lined.
The hydraulic test pressure shall be applied for 5 secs.
P = 2 ST/D
Where
P = Hydraulic test pressure MPa,
D = specified outside dia of the pipe in mm
T = Specified thickness of teh tube in mm
S = stress 60% of the specified minimum yield stress in MPa. The max test pressure is limited to 5 MPa whre ever applicable.
|
Outside dia of steel Pipe (mm) |
Minimum Thickness of lining (mm) |
Tolerance (mm) |
|
168.3 to 323.9 |
6 |
0,+2 |
|
355.6 to 610 |
7 |
0,+2 |
|
660 to 1219 |
9 |
0,+2 |
|
1321 to 2540 |
12 |
0,+3 |
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