Question (48):

According to API RP 520, for pressure safety relief valves the percent maximum relieving pressure

for fire sizing is  ____________ % of the MAWP?

(a) 121%

(b) 100%

(c) 170%

(d) 75%

Difficulty Level: Easy

NCEES Topic/Sub-topic: Facilities Engr. / Relief and safety system sizing

Comment: See fig. 10.10 on page 178 SPE Pet. Engineering Certification and PE License Exam Reference Guide, Ali Ghalambor, Ph.D., P.E. (2020 Update). Pressure relief systems should bedesigned to handle emergency situations and not continuous venting to atmosphere. Design of pressure relief systems should also take into consideration hydrate formation due to rapid escape ofexpanded natural gas.

Answer & Reference(s):  (A): Page 420 & 421. Petroleum Engineering Handbook Vol III (Facilities and Construction Engineering) by Kenneth E. Arnold et al

Answer & Reference(s):  (A): Page 178. SPE Pet. Engineering Certification and PE License Exam Reference Guide, Ali Ghalambor, Ph.D., P.E. (2020 Update