Pressure Gauge Range Selection For Hydrotest

See asme b31 1 appendix j 1 2 10.

Pressure gauge range selection for hydrotest.

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 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.

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 is the requirement for the range of the gauge relative to the calculated hydrotest pressure per asme viii. Maximum test pressure but should not exceed 200. Pressure gauge selection considerations in selecting a pressure gauge 4 range the maximum operating pressure should not exceed 75 of the full scale range.

The normal operating range should be in the middle half of the range between 25 and 75 of the full scale range. Making sense of different ranges on hydraulic pressure gauges. Shop hydrostatic testing of piping systems or. Normally a gauge used is 41 2.

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. 2 water selection criteria for hydrotest. 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. P t minimum test gauge pressure.

Range of the master test gauge should be greater than the. Minimum accuracy should be 1 with minimum sensitivity of 0 5.