code API 510:
5.8.7.2 To minimize the risk of brittle fracture during a pressure test, the metal temperature should be maintained at least 30 °F (17 °C) above the MDMT or MAT for vessels that are more than 2 in. (5 cm) thick and 10 °F (6 °C) above
the MDMT or MAT for vessels that have a...
Gentlemen,
This is clearly stated that API 650 can be used up 2.5 PSI
then 1.1.1 confusing me stating
because ATM pressure is 14.5 PSI!
what is mean by: approximating atmospheric pressure ( internal pressure not exceeding weight of the roof plates.)?