Inhibition of stress-corrosion cracking of steel pipeline
US3973056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Jun 6, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S138/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.