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Primary Examiner: Husack, Ralph
Assistant Examiner:
Attorney: Howson and Howson

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Title: Inhibition of stress-corrosion cracking of steel pipeline

Abstract: A method for inhibiting stress-corrosion cracking of a steel pipeline transmitting gas under elevated pressure provided with an external protective coating and means for cathodic protection, and steep pipe and pipelines so protected are described. The method consists of introducing a composition containing at least one of the inhibitors, calcium monobasic phosphate, sodium monobasic phosphate, sodium tripolyphosphate and potassium silicate, into a buried pipeline environment. The inhibiting composition may be simply introduced to the environment adjacent the pipeline or it may be incorporated in a coating on the pipeline, either in the primer or in a top coating thereover or in an intermediate coating between a conventional primer and topcoating, or in a tape applied to the pipeline.

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Inventors: Fessler, Raymond Roy (Columbus, OH, US)
Berry, Warren Elmer (Columbus, OH, US)
Wenk, Russell Lee (Westeville, OH, US)
Parkins, Redvers Nicholson (Newcastle-upon-Tyne, EN)

Application Number: 477169
Filing Date: 1974-06-06
Publication_date: 1976-08-03
Assignee: American Gas Association, Inc. (Arlington, VA)
Primary Class(es): 427/136 106/14.12, 106/14.21, 138/145, 138/DIG6, 156/187, 252/387, 427/403, 427/409, 427/419.1, 427/427
Other Classes:
US Patent Ref:

2685523	Aug, 1954	Cross et al.	106/14.
2861892	Nov, 1958	Radd et al.	106/14.
2883289	Apr, 1959	Furey et al.	106/14.
3070065	Dec, 1962	Hill	117/94.
3333973	Aug, 1967	Freiman	106/14.
3354169	Nov, 1967	Shafer et al.	117/104.
3357927	Dec, 1967	Marsh et al.	106/14.
3468687	Sep, 1969	Thomas	106/14.
3689305	Sep, 1972	Hausmann	117/94.

Other Refs: Other References: fraser, Corrosion Control in Idle Pipelines, Materials Performance, Mar. 1974, pp. 29-30.
Holzworth et al., Inhibition of Stress Corrosion in Type 304 Stainless Steel by Lithium Silicate, Corrosion-Nace, vol. 25, No. 7, July 1969, pp. 287-288.