DIMENSIONAL VARIATION
TOLERANCE AS PER ASTM SPECIFICATIONS FOR PIPES
| Pipe
Specification ASTM | Nominal
Pipe Size | Permissible
Variations in Outside Diameter (mm) | Permissible
Variations in THK | Permissible
Variations in Length (mm) | Straightness
Tolerance | ||
| Over |
Under | Over |
Under |
Max.
Curvature in any Metre length | |||
|
A/B
106 Cs Seamless Pipe for high temp. A312 Seamless & Welded Austenitic SS Pipes A333 SEamless & Welded Pipes for LT Service A335 SEamless Ferritic Alloy Steel Pipe for High Temp. Serv. |
3
to 40 Incl. | 0.4 |
0.8 |
12.5% (Except for Welded Pipe will Filter Metal Added) |
6 |
0 |
Upto
125 mm O/D and 12mm THK pipe -0.767 mm Over 125mm O/D to 200 mm O/D inclusive -1.15 mm Over 200 mm O/D to 324 mm O/D inclusive -1.52 mm |
|
Over
40 to 100 Incl. | 0.4 |
0.8 | |||||
| Over
100 to 200 Incl. | 1.6 |
0.8 | |||||
| Over
200 to 450 Incl. | 2.4 |
0.8 | |||||
| Over
650 to 850 Incl. | 3.2 |
0.8 | |||||
| Over
850 to 1200 Incl. | 4.0 |
0.8 | |||||
| All
Sizes Upto 1200 NB | 4.8 |
0.8 | |||||
| A
358 ERW Austenitic Cr-NiAs pipe for High Temp. Serv. |
450
to 750 (SCH 6S & 10 S) | +0.5
% -0.5% (Based on Circum-ferencial Measurement) | -0.3
mm |
.3
mm / 8 mtrs. | |||
| A
409 ERW Large Dia Austenitic Steel Pipes | +0.2% -0.2% (for T<4.8 mm) 0.4% -0.4% (For T>4.8mm) (Based on Circum-ferencial Measurement) | -0.46
mm |
4.8
mm/ 3 mtrs. | ||||
