Pressure Gauge Range Selection For Hydrotest

Asme section viii hydrostatic test pressure gauge 03 21 2013 10 08 am what we do offshore is we have a class 0 05 pressure calibrator which is calibrated yearly by a certified company.

Pressure gauge range selection for hydrotest. Shop hydrostatic testing of piping systems or. For a mechanical pressure gauge accuracy is defined either as a percentage of the full scale range or a percent of the span. The 1 5x to 4x limits only applies to analog gauges and that s because they reach their best accuracy as a percentage of full scale within this range. The size of the gauge is decided according to the client specification as per asme sec v t 1030 and sec viii div 1 ug 102 there is nothing given except the pressure range.

Selecting the right hydraulic pressure gauge for your hydraulic application. Minimum accuracy should be 1 with minimum sensitivity of 0 5. 12 in chart with stainless steel pressure element suitable range for the test pressure required one week mechanical spring loaded chart winding clock with flexible capillary inking system. Maximum test pressure but should not exceed 200.

2 water selection criteria for hydrotest. Normally a gauge used is 41 2. P t minimum test gauge pressure. To select the right pressure gauge for your application the following factors should be considered.

See asme b31 1 appendix j 1 2 10. Pressure gauge selection considerations in selecting a pressure gauge 4 range the maximum operating pressure should not exceed 75 of the full scale range. Gauge accuracy pressure gauge accuracy ranges from grade 4a to d according to asme 40 1. The pressure gauges should be calibrated within a year and the pressure range of gauge should not be less than 1 5 greater than 4 times the hydrotest pressure.

Indicate actual hydrostatic test pressures. The 1 5x to 4x is the requirement for the range of the gauge relative to the calculated hydrotest pressure per asme viii.