Standard for Pressure Gauge
Standard for Pressure Gauge
(OP)
We have completed the Nitrogen preservation of a 10'' 16Km pipeline in a swamp location at a pressure of 0.6bar. I have requested for the installation of 0-2bar pressure gauge for the monitoring of pressure over a period of 3 years before the pipeline will be used. The contractor supplied a gauge of 0-10bar which was rejected. I know that there is a standard specifying the use of gauge with range of 1-1/2 to 3 times the desired pressure but can't say the code governing the practice. Can someone help me with the governing code or standard.





RE: Standard for Pressure Gauge
RE: Standard for Pressure Gauge
Good practice is that the max pressure of the fluid is no more than ~75% of the max pressure on the guage. Working range is anywhere up to that point.
I agree that approx. 5% of the range of a guage is too low.
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RE: Standard for Pressure Gauge
1.1 Range – The range of the instrument should be approximately twice the maximum operating pressure. Too low a range may result in (a) low fatigue life of the elastic element due to high operating stress and (b) susceptibility to over- pressure set due to pressure transients that exceed the normal operating pressure. Too high a range may yield insufficient resolution for the application.
http://www.ashcroft.com/installationandmaintenance_pdf/upload/manual-pressure-gauges-large.pdf
ASME B40.100-2005
4.3.1 Operating Pressure.
The pressure gauge selected should have a full-scale pressure such that the operating pressure occurs in the middle half (25% to 75%) of the scale. The full-scale pressure of the gauge selected should be approximately 2 times the intended operating pressure.
RE: Standard for Pressure Gauge
My wife's grandfather was a boiler engineer in a Canadian paper mill. He actually gave me a pressure gauge from the 1920's that still functioned, and is a work of art. I had always heard that one should specify the range to be two times the normal operating pressure, and I asked him for the reasoning for doing so.
He said that by doing so, an operator could quickly scan a bank of gauges (of different pressure ranges) some distance away, and if they all pointed to 12 o'clock, the system was happy.
Makes sense to me.
donf
RE: Standard for Pressure Gauge
TTFN

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RE: Standard for Pressure Gauge