Table 56.85-10-Preheat and Postheat Treatment of Welds
ASME Sec IX Nos. | Preheat required | Post heat treatment requirement (1)(2) | ||||
Minimum wall (3)(4) (inch) | Minimum temperature (5)(6)(°F) | Minimum wall and other (3)(4)(17)(inch) | Temperature (7)(8)(9)(10)(11)(12)(°F)(inch) | Time cycle | ||
Hour per inch of wall (3)(4) | Minimum time within range (hour) | |||||
P-1(16) | All | 50 (for .30 C. maximum or less) (13) | Over 3/4 in | 1,100 to 1,200 (minimum) (maximum) | 1 | 1 |
P-1(16) | All | 175 (for over .30 C.) (13) and wall thickness over 1 in | ......do | ......do | 1 | 1 |
P-3(15) | All walls | 175 | Over 1/2 in | 1,200 to 1,350 (minimum) (maximum) | 1 | 1 |
P-4(15) | Up to 3/4 in inclusive | 300 | Over 1/2 in or over 4 in nom. size or | 1,330 to 1,400 (minimum) (maximum) | 1 | 1 |
Over 3/4 in | 400 | Over .15 C. maximum | ||||
P-5(15) (less than 5 cr.) | Up to 3/4 in inclusive | 300 | Over 1/2 in or over 4 in. nom. size or | 1,300 to 1,425 (minimum) (maximum) | 1 | 1 |
Over 3/4 in | 400 | Over 0.15 C. maximum | ||||
P-5(15) (5 cr. and higher) | Up to 3/4 inclusive | 300 | All walls | ......do | 1 | 2 |
Over 3/4 in | 400 | Over 0.15 C. maximum | ||||
P-6 | All walls | 300 (14). | All walls | 1,400 to 1,500 (minimum) (maximum) | 1 | 2 |
P-8 | ......do | None required | ......do | None required |
For P-7, P-9A, P-9B, P-10C and other materials not listed the Preheat and Postheat Treatment is to be in accordance with the qualified procedure.
Notes Applicable to Table 56.85-10:
Local postheat treatment of welded branch connections must be performed by heating a circumferential band of the pipe to which the branch is welded. The width of the heated band must extend at least 1 inch beyond the weld joining the branch.
46 C.F.R. §56.85-10