Components within a spec ina spec break

engr2GW · Jan 2, 2018

Hi,
If I have a spec break from ANSI 600 (1440psig) to ANSI 300 (750psig). I believe that means that the lowest working pressure rating for any component in the 300 class region should be 750psig. My question is, is there anything wrong with or any problem with having a component higher than that? say 1000psig rating instrument or valve?

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LittleInch · Jan 2, 2018

First it's not ANSI 600 /300, it's ASME class 600 or 300. Max working pressure is determined by the flange material and temperature neither of which you mention

Flange class ratings are step changes and are maximum pressures. Any item rated lower than the flange rating will set a lower limit but a higher one won't raise the max working pressure but just cost more.

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engr2GW · Jan 2, 2018

@ LittleInch, Thank you for the response and correction. I was not detailed enough.

As much as possible, do it right the first time...

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Components within a spec ina spec break

engr2GW

Petroleum

LittleInch

Petroleum

engr2GW

Petroleum

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