Rajat HT temp for testing : Ambient Temp (Room Temp conditions) HT Test Pressure : varies with design pressure x 1.5 times (as per applicable design code) + correction or multiplication factor for allowalble stress drop at appropriate design temperature for the particular material used. Design temperatuer : is for the process service temperature. You have to apply a correction factor or multiplication factor for appropriate design temperature for HT test pressure at Room Temp conditions. ( i.e., test at room temperature) for the stress value shown as per applicable design code (See respective Tables for allowable stress for design temperature for the particular material in use) and test the vessel with this correction factor pressure conditions. Trust this answers your querry. C.V.Srinivasan Nishi Engineers Pvt Ltd India Sept 29, 2006 E-mail: nishi@vsnl.com >i would appreciate it if anybody could explain :- >- Is the Hydrostatic temprature same as the design pressure >and if not >- How do u check at what temprature hydrostatic test needs >to be carried out.

I think the latest applicable code for HT pressure is 1.3 times of the design pressure. Please advice.