Material Spec for High Partial Pres. H2S Gas Pipeline 6

[mcmidkiff]

What material specification should be used for gas piplines with high partial pressure H2S (P(H2S) = 4 psig)? I am under the impression that MR0175 does not address HIC, SWC, and others and that I should spec conformance with ISO 15156-2. The pipe vendors respond that MR0175 is equivalent to ISO 15156-2. I'm confused. Should I require Full Body Normalized? Do I need to specify a max on manganese and sulfur content? Also, should I spec Gr B or is X-42 okay? I'm concerned that the actual yield of X-42 may be as much as X-60. Is there a problem with full body normalized ERW vs. seamless?

 

[JMcHaney]

The publication offered by Pipeline Research Council International at the link below (followed by copy of the abstract, etc.)provides a useful discussion of specification of line pipe, fittings, and flanges for sour-service applications.

The report discusses and provides recommendations for specifying line pipe, fittings, and flanges resistant to the four major hydrogen damage mechanisms for piping components including blistering, hydrogen-induced cracking, stress-oriented hydrogen-induced cracking, and sulfide-stress cracking.

Recommendations in this publication do not agree with some of the responses to your posting.

The publication should be available at no cost to employees of organizations that are members of PRCI.

Although I was a primary co-author of the publication, it was prepared under contract to PRCI, who owns all rights to reproduction and sale of the publication. Consequently, sale of a copy of the publication does not benefit me or the other co-authors.

With regards,
Jim McHaney

http://www.prci.com/publications/L51789.htm

Recommended Practice for Sour-Service Piping Components

Category: Materials
Project Number: PR-252-9605
Catalog Number: L51789
eBook Version Available: Yes, L51789e
Publication Date: January 01, 1997
Author(s): McHaney, J.; Bruno, T.; Buehler, W.
Research Agency: Metallurgical Consultants, Inc.
Pages: 245
Binding Type: GBC
Software Included: No
System Requirements: N/A

Click here to view Table of Contents

Abstract:

Need: Existing industry standards do not adequately address all the issues related to construction and operation of pipelines to transport fluids containing both liquid water and hydrogen sulfide (H2 S), commonly called wet sour service or sour-service applications. The lack of industry standardization for sour service is significant because some commercially available line pipe, fittings and flanges are susceptible to failure when exposed to sour service. The failures that can occur are due to damage of carbon steel as a result of the corrosion reaction between H2 S and carbon steel. Operators of sour-service systems have developed company-specific or project-specific practices and specifications for design, construction, operation and maintenance of those systems. One result of company-specific and/or project-specific specifications is a lack of standardization in sour-service line pipe, fittings and flanges. The lack of standardization in sour-service piping components results in additional costs for initial construction, modification and maintenance of sour-service systems.

Benefit: The objective of this project for the Line Pipe Research Supervisory Committee was to develop recommended practices that a knowledgeable user can apply to the specification of line pipe, fittings and flanges for use in construction of pipelines and piping systems to transport fluids containing both liquid water and H2S. Development of recommended practices for construction, modification and maintenance of sour-service systems was outside the scope of this project. This report includes a discussion of the current understanding of broad issues relating to sour-service pipelines. This discussion is a summary of the more important issues rather than a critical review of all related literature on the subject of sour service. This report includes recommended specification criteria for line pipe, fittings and flanges in expository format. These criteria provide guidance for preparation of the specifications in commercial language for sour-service line pipe, fittings and flanges. These criteria should allow users to modify existing specifications for ordinary-service piping components to specifications suitable for sour service. This project included a survey of LPRSC members and producers of line pipe, fittings and flanges recommended by committee members. The goal of these surveys was to collect current information about the range of member practices and products readily available from surveyed producers.

Result: Producers of line pipe, fittings and flanges indicate a clear preference for greater standardization of sour-service piping components. There is significant economic incentive for members of the PRCI to pursue greater standardization of sour-service piping components. This standardization of sour-service piping components could benefit both PRCl members and producers of piping components. A sizable block of users must adopt uniform specification requirements when purchasing sour-service piping components for standardization to occur. Implementation of recommendations in this report could result in uniform specification requirements for sour-service piping components. Industry technical committees would likely incorporate specification requirements that become generally accepted as de facto standards for sour-service piping components.

Price: $495.00