Full ring ovalization test for determining the susceptibility to cracking of linepipe steels in sour service. Test method

BS 8701:2016

Full ring ovalization test for determining the susceptibility to cracking of linepipe steels in sour service. Test method

Status : Current   Published : June 2016

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HARDCOPY



What is this standard about?

This is a new British Standard on how to test for corrosion and environmentally assisted cracking in oil and gas pipelines. It is a revision of HSE guidance document OTI 95 635 which is referenced in ISO 15156, the flagship document for upstream material selection for sour service.

Who is this standard for?

It will be used by the manufacturers of pipelines that are designed to transport petroleum, petrochemicals and natural gas products. 

Why should you use this standard? 

Sour service cracking problems in pipeline steels are caused by the presence of wet hydrogen sulphide (H2S). This standard provides a protocol for ensuring such pipelines are properly tested to avoid environmental damage from pipeline failure.

The test method determines the susceptibility of pipeline steels, bands, flanges and fittings including all associated welds. It details an industry-proven technique for assessing pipeline steels by stressing a full ring specimen in a sour environment using mechanical means to deform the pipe by ovalization.

The test exerts a known stress level at two regions of a full ring section of pipe steel. The pipe specimen is then exposed internally to a sour test solution, although some cases require the sour media externally.

Ultrasonic monitoring and hydrogen permeation measurements are then conducted regularly during the exposure period. Both crack initiation and propagation can therefore be monitored. Finally a metallographic study of indications is undertaken to classify any defects found by the ultrasonic survey. 




Standard NumberBS 8701:2016
TitleFull ring ovalization test for determining the susceptibility to cracking of linepipe steels in sour service. Test method
StatusCurrent
Publication Date30 June 2016
Normative References(Required to achieve compliance to this standard)BS EN 12668, BS EN ISO 2400, BS EN ISO 7963, BS EN ISO 8044, BS EN ISO 9712, BS EN ISO 11666, BS EN ISO 16810, BS EN ISO 17640, ASTM D1193, NACE TM0177
Informative References(Provided for Information)BS EN ISO 9001, BS EN ISO 9002, BS EN ISO 9934, BS EN ISO 16811, BS EN ISO 15156-3, ASTM A370, OTI 95 635, Control of Substances Hazardous to Health Regulations, 1988 (COSHH)
Draft Superseded By16/30319903 DC
DescriptorsAlloy steels, Vanadium steels, Tungsten steels, Titanium steels, Silicon steels, Niobium steels, Nickel steels, Molybdenum steels, Manganese steels, Low-alloy steels, High-alloy steels, Copper steels, Cobalt steels
ICS77.060
CommitteePSE/17
ISBN978 0 580 89474 9
PublisherBSI
FormatA4
DeliveryYes
Pages56
File Size65.49 MB
Price£254.00


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