Community Research and Development Information Service - CORDIS

Abstract

The emergence of standards on leak-tightness of industrial valves has given rise to a set of problems associated with the way in which leak-tightness is both measured and expressed. Issues surround:

-The specified gas:
End users prefer a leakage targets in gases representative of the duty. Valve manufacturers and test houses prefer the use of helium as a safe, detectable, inert test gas, widely used for leak testing in many other contexts.

-The measurement method:
Many end users prefer a leak-tightness result expressed in terms of ppmv measured by sniffing, since this is the format of Environmental Protection Agency (EPA) targets in the USA and is widely used across the world for on-site leakage detection and repair (LDAR) programmes.

The work reported here provides relevant technical data and analysis to help resolve these issues by:

- Investigating measurement methods and recommending means by which scatter in the relationships between ppmv and leak rate can be dramatically reduced.

-Evaluating measurements of leakage of different gases under similar conditions to identify means of predicting leakage of various gases from measurements of helium leakage.

Experimental work was concentrated on valves representative of typical volatile organic compound (VOC) duties over a range of sizes and types (but particularly 4" Class 300 gate valves) with several different packing types (but mostly graphite) over a range of leakage rates/ representative of this duty.

Additional information

Authors: Authors from the following Institutions/Affiliations contributed to this work:, BHR GROUP LIMITED, CETIM, NELES AUTOMATION, CHESTERTON, EUROPEAN SEALING ASSOCIATION, ASSOCIATION FRANCAISE DES INDUSTRIES DE LA ROBINETTERIE, ELF ANTAR, INFICON, ALCATEL CIT
Bibliographic Reference: EUR 19772 EN (2000). Euro:Free of charge
Availability: available from: Documentation Service OF DG Research fax: +32-2-2958220
ISBN: ISBN: 92-894-0502-3
Record Number: 200013243 / Last updated on: 2001-04-20
Category: PUBLICATION
Original language: en
Available languages: en
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