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本文描述了一种最新研制出的独特的活塞式气体标定管装置及其现场检定气体流量计,提高计量精度的优点。该气体标定管已经过天然气流量标定装置测试,并经Colorado工程实验站公司(CEESI)测定验证其计量特性、复现性和精度。该活塞式标定管设计与现有的活塞式液体标定管相似,为一双向体积管,采用一特制的活塞随气体在标定过的、已知容积的管段内移动。它的结构设计能适应在现场运行条件下检定诸如气体涡轮流量计或孔板流量计。该设备能便捷地与待标的现场流量计串连起来。推动活塞,通过标定管段的压差小于4in水柱。在质量鉴定试验时,用未经处理的天然气标定了一台标准涡轮流量计。试验结果表明涡轮流量计脉冲计数的复现性为±0.05％。还在CEESI实验站与空气标定系统串连,标定了该话塞式标定管的精度。这项研究证实了,用一台轻便活塞式气体标定装置能成功地对气体计量设备进行就地检定,提高流量计量精度。
This article describes a newly developed unique piston gas calibration tube device and its field test gas flowmeter to improve the metrology accuracy advantages. The gas calibration tube has been gas flow calibration device test, and by Colorado Engineering Laboratory Station Company (CEESI) measured to verify its metrology, reproducibility and accuracy. The design of the piston calibration tube is similar to the existing piston type fluid calibration tube. It is a bi-directional tube with a special piston moving with the gas in the calibrated tube segment of known volume. Its structural design accommodates the verification of gas turbine or orifice flowmeters in field operation. The device can be easily and in-line with the field flow meter to be marked. Pistons, through the calibration of pipe pressure is less than 4in water column. At the qualification test, a standard turbine flow meter was calibrated with untreated natural gas. The test results show that the repeatability of the pulse count of the turbine flow meter is ± 0.05%. CEESI experimental station is still in series with the air calibration system, calibration of the cuffed calibration tube accuracy. This study confirms that a portable piston gas calibration device can be used to perform on-site verification of gas metering equipment to improve flow measurement accuracy.