Can the temporary reduction in operating pressure be based on calculations other than those defined in section 451.7 of ASME/ANSI B31.4?
The method described in section 451.7 of ASME/ANSI B31.4 is required by the rule and must be used for all circumstances for which it is appropriate (e.g., corrosion). There are anomalies defined by the rule as immediate repair conditions for which the method of section 451.7 is not applicable (e.g., dents). These are addressed in c. below. PHMSA Pipeline Safety is considering a change to the rule to recognize that section 451.7 is not applicable to all immediate repair conditions, and may also allow alternative methods for calculating the required reduction in pressure. Until the rule is changed, however, the specified method must be used in all instances in which it applies. c. Is section 451.7 of ASME/ANSI B31.4 applicable for calculating the temporary pressure reduction required for top-side dents with metal loss (195.452(h)(4)(i)(C)) and dents greater than 6% of the pipe diameter (195.452(h)(4)(i)(D))? No. The calculation in Section 451.7 of ASME/ANSI B31.4 is applicable to determi
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- Can the temporary reduction in operating pressure be based on calculations other than those defined in section 451.6.2.2 (b) of ASME/ANSI B31.4?
- Can the temporary reduction in operating pressure be based on calculations other than those defined in section 451.7 of ASME/ANSI B31.4?
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