API Standard 520 - Sizing, Selection, （API标准520 -分级,选择,）.pdf

API Standard 520 - Sizing, Selection, Installation of Pressure Relieving Devices Part I, Sizing Selection Last update: June 16, 2005 Standard Section Inquiry # Question Reply 520 Part I 7th - Jan. 3.3.3.1 520-I-01/03 Question 1: Is this a correct interpretation of Section 3.3.3.1.3 in Reply 1: Yes. The latest revision to RP 520 Part 1 is intended to permit 2000 that the backpressure was specified to not exceed the allowable the backpressure for a conventional pressure relief valve to go up to but overpressure? not exceed the allowable overpressure. For cases such as the fire case, and as shown in your examples, a backpressure over 10% is permissible. Question 2: If my interpretation of 3.3.3.1.3 is correct, would Reply 2: API cannot respond to this question as it is outside the scope relief valve manufacturers be re