The recommendations of this code apply only to above ground steel piping through 450°F. GPTC/Z380 and B31.8, prior to 2004, recommendations are similar in many ways. The differences between GPTC/Z380 and B31.8 display below:
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The longitudinal joint factors vary slightly between B31.8 Table 841.115a and GPTC/Z380 Table 192.113.
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The design factor in B31.8 Table 841.114b provides more detail than GPTC/Z380 Table 192.11.
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The allowable for the combined stress calculation in GPTC/Z380 Section 192.159-1.5e includes a "0.75" factor, while B31.8 Section 833.4 does not.
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GPTC/Z380 uses a single stress intensification factor (SIF) for both in-plane and out-of-plane loads, while B31.8 distinguishes between in-plane and out-of-plane SIFs.