Does anybody know any internet site where i can download a program for sizing safety-relief valves?
I mean a kind of valve selector.
I used to have a crosby size program, but its not working good.

My suggestion, get any PSV manual and write a spreadsheet to do the sizing.  After you've created that, you will understand what goes into sizing a PSV for the various cases and how variations affect the sizing a lot more than punching numbers into a program.

Personally, I hate it when vendors can't give me the formulas how their equipment work but will send me a program that no one understands what is in it.

Anderson Greenwood and Crosby are both owned by Tyco's flow control division.  I could not find a link on their website to download their sizing program though I know they have one.

I'd try to find a local office and see if they can make a copy available for downloading or get what you want to you in another format.

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