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B31.4 - Cases No. 4
A Caseistheofficialmethodofhandlingareplytoaninquirywhenstudyindicates or that the Code wording needsclarification, when the reply modifies the existing requirements oftheCode, or grantspermissiontousenewmaterials or alternative constructions. ASME hasagreedtopublish Cases issued bytheB3 1Committee concerning B31.4 as part of theupdateservicetoB31.4.ThetextofproposednewandrevisedCasesand in Mechanical Engineering forpublicreview. A reaffirmations of currentCasesappear notice alsoappears in Mechanical Engineering when new and revised Cases are approved. NewandrevisedCases, as well as announcements ofreaffirmedCasesandannulments,thenappearinthenextupdate.AllCasescurrentlyineffectatthetimeofpublicationof a newEditionoftheCode are included with it as asupplement. 1998 Edition The page numbers for the Cases supplements included with updates to the start with C-1 andcontinue consecutively through the last Cases supplement to this Edition. as follows: TheCaseincludedwiththissupplementis

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COPYRIGHTAmerican Society of Mechanical Engineers Licensed by Information Handling Services

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CASES OF THE CODE FOR PRESSUREPIPING

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B31 CASE 167

B31 Case 167 U e of Mechanically Applied Composite Material Wrap for Pipeline Repairs, B31.4 s
Approval Date: April 1997
This case shall expireon April 30,2000, unless previously annulled or reaffirmed

Inquiry: Under what conditions may mechanically appliedcompositematerialwrap be used forpipeline repairscovered bypara.451.6.2(b)?

Reply: It isthe opinion of the committee that if itisnotpracticaltotakethepipelineoutofservice, be repaired the by nonleaking corroded may areas installation of a mechanically applied composite material...