pressure testing standards for hyd line

[kruser]

I am looking for pressure testing standards, particularly analog chart resolution requirements. How much percentage of a chart's scale should be considered acceptable (example: 7500psi test on 20,000psi chart is 37.5%)? I would expect to use between 60 to 80%. Is there a standard?

 

[snubengr]

Remembering back to my instrumentation days, I think that in general, pressure measuring devices which utilize bourdon tubes, are at the highest accuracy between 30% and 80% of the range. I think that most, if not all, analog chart recorders use bourdon tubes for pressure measurement.

However, it's been a long time, so I stand to be corrected on any or all of the above.

Cheers,

Snubengr

 

[Fracball]

kruser:

I know of one standard that addresses this - API Spec 16C. During equipment tests, it requires that measurements be made in the range of 25% to 75% of the gauge full scale deflection.

Fracball