Thematic wordMetric standard studies natural gas orifice plate
Overview
Current, still use at natural gas flowmeter to measure without uniform international standard in the world, use flowmeter of standard orifice plate to measure fluid discharge to be put in ISO 5167-1 of two parallel standards, API 2530 (AGA No.3) . As a result of general and it is certain to be used technically at measuring natural gas to exist difference, and make natural gas orifice plate to our country metric standard brings certain difficulty. But the data of the the earliest, finest, test that flowmeter of standard orifice plate is domestic and international research most, use experience the metric method with top rate of the richest, standardization. Because this is close 20 years, euramerican flowmeter quantity expert studies with learning means undertook experimenting in great quantities study the work, gathered many test data, built the API EEC database that has place of 16376 tests data, gain common knowledge stage by stage, newest and unified pour out of coefficient computation to use API NEL formula. ISO 5167-1 standard edited 1998 compensatory already promulgated, it basically will pour out of coefficient computation formula to replace former StoIz formula with API NEL formula, install the further research of condition and commutator according to be opposite, published CD document in March 1999, this all has main effect to report of GB/T2624-93, AGA No.3. API 2530 (AGA No.3) released new version in August 2000, installation condition has bigger change, two standards all considered a large number of accurate data that come nearly 20 years, pour out of coefficient computation formula to use API NEL formulary form. Brigadier of on international two mark tends gradually unified, the text that main technique asks also will be sent to each member country, edit this metric to domestic and international discharge having bigger effect, the national standard that also establishs flowmeter of natural gas orifice plate to measure for our country offerred fundamental condition.
Conform to accelerate weights and measures technique of our country natural gas and international convention, catch up with the change of international standard, make full use of the achievement of foreign advanced standard and experience, coefficient and installation condition and straight canal end length are poured out of to spend the newest change of the requirement in going up to go up to the sky to enrage orifice plate flowmeter to measure a level like that in the international on large-scale experiment foundation in last few years in the light of international, the article undertook analytic study to this, this metric to our country natural gas standard conforms with foreign advanced standard as soon as possible the port with having very principal.
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