monometer selection?
monometer selection?
(OP)
Hii...during hydrostatic testing of piping (B31.3 or API 1104) what is the criteria for pressure gage selection...?
Eg. desing pressure is 10bar , so test pressure is 1.5 times design pressure so 15bar...which one of the pressure gage should be used...?(a 25bar gage or 40bar or 60bar)
thanks...
Eg. desing pressure is 10bar , so test pressure is 1.5 times design pressure so 15bar...which one of the pressure gage should be used...?(a 25bar gage or 40bar or 60bar)
thanks...





RE: monometer selection?
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RE: monometer selection?
RE: monometer selection?
Digital gages are entirely different. Digital gages should be used closer to their upper limit. Manufacturer certs for digital gages always state accuracy as % of full scale reading. Again using ASME B&PV Code as standard, acuracy of digital gage must be 1% of reading. If your gage is certed at .25% accuracy (standard gage), you need to be above 25% of full scale to achieve 1% of reading accuracy.
JR97
RE: monometer selection?
Patricia Lougheed
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RE: monometer selection?
I worked in my home-town refinery carrying tools as an apprentice in the instrument craft after I graduated - before starting my engineering career. I rebuilt and calibrated pressure gauges and did not find pressure gauges to be non-linear at the high end. However, the bottom 5 % is just slop. We liked to select the test gauges used for gauge calibration to match the selected gauge. We did calibration mostly to the top of the scale.
If the test gauge was non linear near the top, it matched the process gauge well. We checked the test gauges with dead-weight.
RE: monometer selection?