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Permissible variations in outside diameter.
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Tolerance |
| Nom. pipe size ins. |
PLUS |
MINUS |
| 1/8 to 1 1/2, incl. |
1/64 (0.015) |
1/32 (0.031) |
| Over 1 1/2 to 4, incl. |
1/32 (0.031) |
1/32 (0.031) |
| Over 4 to 8, incl. |
1/16 (0.062) |
1/32 (0.031) |
| Over 8 to 18, incl. |
3/32 (0.093) |
1/32 (0.031) |
| Over 18 to 24, incl. |
1/8 (0.125) |
1/32 (0.031) |
Permissible variations in wall thickness
Seamless and Welded Austenitic Stainless Steel Pipe have a minimum wall thickness that at any point shall not be more than 12.5 per cent under the nominal wall thickness specified.
See ASTM A530 for additional information.
Electric Fusion Welded Austenitic Chromium Nickel
Alloy Steel Pipe for High Temperature Service.
Five classes of pipe are covered as follows:
Class 1 - Pipe shall be double welded by processes
employing filler metal in all passes and shall be completely
radiographed.
Class 2 - Pipe shall be double welded by processes employing
filler metal in all passes. No radiography is required.
Class 3 - Pipe shall be single welded by processes
employing filler metal in all passes and shall be completely
radiographed.
Class 4 - Same as class 3 except that the weld pass exposed
to the inside pipe surface may be made without the addition of
filler metal (see 5.2.2.1 and 5.2.2.2).
Class 5 - Pipe shall be double welded by processes employing
filler metal in all passes and shall be spot radiographed. |
Permissible variations in wall dimensions.
Permissible Variations - The dimensions at any point in a
length of pipe shall not exceed the following:
Outside Diameter - Based on circumferential measurement,
¡À 0.5% of the specified outside diameter.
Out-of-Roundness - Difference between major and minor
outside diameters, 1%.
Alignment - Using a 10-ft or 3-m straightedge placed so that
both ends are in contact with the pipe, 1/8 in. (3mm).
Thickness - The minimum wall thickness at any point in the
pipe shall not be more than 0.01 in. (0.3mm) under the
nominal thickness. |
See ASTM A530 for additional information. |
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