Above diagrams and recommendations that follow apply to components with ends originally prepared as standard 37½º or 30º degree bevels and where the wall thickness of the thicker end to be joined does not exceed 1½ times the thinner (pipe) end.

1. The nominal thickness t₁ (pipe) and t₂ (fitting) shall comply with the design requirements of the applicable section of the ASME/ANSI B31 code for pressure piping.
2. Where the total nominal offset (t₂-t₁) does not exceed 3/32" (*) and full penetration and bonding is obtained during welding, no special treatment is required [see sketch (A)].
3. When the internal offset exceeds 3/32", taper cut in accordance with Figure (B)**...or taper weld in accordance with Figure (C).
4. When joining ends with materials of unequal minimum specified yield strengths (or unequal allowable stress), the deposited weld metal shall have mechanical properties at least equal to those of the higher strength (pipe) end.

* For service in systems operating below 20% SMYS, refer to applicable section of ASME  B31.4 or B31.8.
** No minimum when materials joined have equal minimum specified yield strengths (allowable stress).