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Model Number :
ASTM A 312/A 312M
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Description
Applications
The Main Grades Used
Dimension of Welded and Seamless Stainless Steel Pipe
[Permissible Variations in Outside Diameter]
|
NPS Designator
|
Permissible Variations in Outside Diamete
|
|||
|
Over
|
Under
|
|||
|
in
|
mm
|
in
|
mm
|
|
|
1/8 to 1-1/2 incl.
|
1/64 [0.015]
|
0.4
|
1/32 [0.031]
|
0.8
|
|
Over 1-1/2 to 4, incl.
|
1/32 [0.031]
|
0.8
|
1/32 [0.031]
|
0.8
|
*ASTM A 999 : Table 3
[Permissible Variations in Wall Thickness]
|
NPS Designator
|
Tolerance, % from Nominal
|
|
|
Over
|
Under
|
|
|
1/2 to 2-1/2 incl. all t/D ratios
|
20.0
|
12.5
|
|
3 to 18 incl. t/D up to 5%
|
22.5
|
12.5
|
*ASTM A 312 : Table 3
[Permitted Variations in Length]
* ASTM A 312 : Section 13
[Outside Diameter and Schedule]

*ASTM A 312 : Table 3
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