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Title: API 14.3/AGA3 Mechanical Specifications Old - Vs - New
Author: Steven P. Klak
Source: 1993 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1993
Abstract: In February of 1991, API and AGA issued a revised orifice meter standard that significantly changed many of the mechanical requirements of orifice meters. The revised standard is referred to as API 14.3 Part 2 or AGA 3 Part 2. In the two years since its release the standard has gained wide acceptance and with good reason - adherence to the new requirements promises improved measurement accuracy. The new document is technically sound. The old standard was based on old, limited data. The new standard is based on a great amount of recent test data. The new standard is much clearer with regards to what is exactly required. Because of this, the interpretation and understanding is much easier. Most of the changes involved reducing the tolerances allowed within the orifice meter, clarifying old requirements and adding a few new ones. The purpose of this paper is to present the new requirements, discuss practical interpretations, and offer possible inspection methods.

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