Draft for comments on the local verification regul

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The results obtained in Hunan Province's "ultrasonic gas meter" are more likely to be related to the basic tearing capacity of materials. The release of the exposure draft of the verification regulations of interested parties

green energy not only solves the crisis of energy shortage, but also solves the contradiction between energy and environment. Strong policy support is an important factor for the broad prospects of green energy. In recent years, with the support of the national clean energy policy, natural gas market consumption is hot

on February 19, 2019, Hunan provincial market supervision and Administration Bureau issued the draft for comments on the local verification regulations of ultrasonic gas meters in Hunan Province, and solicited public comments

ultrasonic gas meters have advantages in volume, maintenance and intelligent expansion compared with previous membrane gas meters because of their full electronic structure, no mechanical transmission part, no mechanical noise in operation, no magnetic induction components, and their measurement is not easily affected by the magnetic field. Therefore, the market capacity of ultrasonic gas meters is rapidly increasing

however, at present, there is no corresponding national metrological verification regulation or calibration specification for ultrasonic gas meters. Only Beijing Tianjin Hebei, Shanghai, Jiangxi, Chongqing, Henan and other provinces and cities have issued local metrological verification regulations. Hunan gas companies cannot use ultrasonic gas meters for trade settlement. Therefore, Hunan market supervision and Administration Bureau initiated the formulation of local metrological verification regulations for ultrasonic gas meters and recently completed the draft for comments

Hunan provincial local verification regulation of ultrasonic gas meter is mainly drafted by Hunan Institute of Metrology and testing, with Hunan Yintong Technology Co., Ltd., Changsha Xinao Gas Co., Ltd., Zhejiang Weixing Intelligent Instrument Co., Ltd. and Liaoning Sikai Technology Co., Ltd. participating in the drafting, and is under the jurisdiction of Hunan market supervision and Administration Bureau

this regulation is mainly based on the international recommendations R 2:2012 gas meters (gas meters) of the international organization for Legal Metrology (OIML) and the European standard for slow response control en14236:2007 ultrasonic domestic gas meters (household ultrasonic gas meters), with reference to the national verification procedures JJG "membrane gas meters" and JJG "ultrasonic meters", and based on the current situation of ultrasonic gas meters in China. It is equivalent to international recommendations and EU standards in terms of main technical indicators

the terms used in this procedure, except for those specifically defined in this specification, adopt JJF 1001 general measurement terms and definitions and JJF 1004 flow measurement terms and definitions

the documents cited in this procedure include JJG ultrasonic flowmeter, JJG membrane gas meter, JJF 1001 general measurement terms and definitions, JJF 1004 flow measurement terms and definitions, gb/t 6968 membrane gas meter, gb/t gas flowmeter, jb/t domestic ultrasonic gas meter, en14236:2007 ultrasonic domestic gas meters, OIML R 2:2012 gas meters

this regulation is prepared in accordance with JJF rules for the preparation of national metrological verification regulations. This procedure specifies the scope, reference documents, terms and measurement units, overview, measurement performance requirements, general technical requirements, measurement instrument control, appendices, etc

this regulation is the first local verification regulation of Hunan Province. This procedure is applicable to the first verification, subsequent verification and in-service inspection of ultrasonic gas meters for closed pipelines with the maximum working pressure not exceeding 50kPa and the maximum flow not exceeding 100m3, transferring more employees to other departments/h as far as possible, and taking the time difference method as the measurement principle

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