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一、目前检定气体涡轮流量计时选取的取压位置流量计仪表系数的计算中大气压力、流量计处和标准装置处的气体压力都参与其中,由此可见,不同取压位置会对计算结果产生不同影响。按照国标和检定规程规定,表体有取压孔的要在表体取压,当一些流量计表体没有取压孔时,一般在流量计前段管道上取压。不同位置的取压会对流量计的检定结果产生怎样的影响,笔者选取了国内外几种品牌的气体涡轮流量计(准确度等级见表1)
First, the current verification of gas turbine flowmeter selected pressure position meter meter factor calculation of the atmospheric pressure, flowmeter and standard equipment at the gas pressure are involved, we can see that different pressure location will result in the calculation Different effects. In accordance with the national standard and test procedures, body pressure gauge hole to take pressure on the body, when some flow meter body does not take pressure on the hole, usually in front of the flow meter to take pressure on the pipeline. Different positions of the pressure on the flowmeter will result in the test results, the author selected several brands of gas turbine flowmeter (accuracy grade in Table 1)