Figure 56.70-15(g)-Acceptable types of welded pipe connections
tn = nominal thickness of branch wall less corrosion allowance, inches.
tc = the smaller of 1/4 inch or 0.7tn.
te = nominal thickness of reinforcing element (ring or saddle), inches (te = 0 if there is no added reinforcement).
tmin = the smaller of tn or te.
tw = dimension of partial penetration weld, inches.
Table 56.70-15-Reinforcement of Girth and Longitudinal Butt Welds
Thickness (in inches) of base metal | Maximum thickness (in inches) of reinforcement for design temperature | ||
Below 0 °F or above 750 °F | 350° to 750 °F | 0 °F and above but less than 350 °F | |
Up to 1/8, inclusive | 1/16 | 3/32 | 3/16 |
Over 1/8 to 3/16, inclusive | 1/16 | 1/8 | 3/16 |
Over 3/16 to 1/2, inclusive | 1/16 | 5/32 | 3/16 |
Over 1/2 to 1, inclusive | 3/32 | 3/16 | 3/16 |
Over 1 to 2, inclusive | 1/8 | 1/4 | 1/4 |
Over 2 | 5/32 | (1) | (1) |
1 The greater of 1/4 in. or 1/8 times the width of the weld in inches.
NOTES:
46 C.F.R. §56.70-15