Title: Double tracer gas process for locating conduit leaks

Abstract: A process for locating leaks in an underground protective conduit disposed about a carrier pipe, and comprising the insertion of a double tracer gas into the protective conduit for the purpose of detecting leaks in the protective conduit. The process comprises the use of a double tracer gas which includes about two and one-half (21/2) to ten (10) percent methane and about ninety (90) to ninety-seven and one-half (971/2) percent argon.

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Inventors: Heim, Paul M. (Franklin, MA, US)

Application Number: 969284
Filing Date: 1978-12-13
Publication_date: 1980-02-26
Assignee: Heath Consultants, Incorporated (Stoughton, MA)
Primary Class(es): 73/40.7
Other Classes:
US Patent Ref:

2486199	Oct, 1949	Nier	73/40.
2928247	Mar, 1960	Hubbell	73/40.
2996661	Aug, 1961	Roberts	73/40.
3036457	May, 1962	Wood et al.	73/40.
3085423	Apr, 1963	Champion	73/40.
3106089	Oct, 1963	Scott et al.	73/40.

Other Refs: 23295492317649

Jan, 1975	DE
Feb, 1977	FR

Primary Examiner: Goldberg, Gerald
Assistant Examiner: Roskos, Joseph W.
Attorney: Mentag; Robert G.