I guess my questions are, is this a common installation for a conventional relief valve and am I correct in interpreting it as meeting the intent of API 520? Section 5.3.3.2.1 states "Balanced valves can typically be applied where the total backpressure ( superimposed plus built-up) does not exceed approximately 50 % of the set pressure. The choice of a conventional PSV caught my attention given the high back pressure.įrom API 520 Section 5.3.3.1 the clauses strictly refer to built up back pressure not exceeding 10% of set pressure (21% for fire, etc). This relief valve already exists in the plant I work at and relieves into the suction side of the pump it protects. Variable Superimposed Back Pressure: 20 kPag I have come across a conventional relief valve that has challenged my understanding of API 520, so I am here to ask for some insight.Ĭonstant Superimposed Back Pressure: 2100 kPag
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |