BS 9690-2:2011

This standard BS 9690-2:2011 Non-destructive testing. Guided wave testing is classified in these ICS categories:

• 19.100 Non-destructive testing

This part of BS 9690 specifies the basic requirements for screening pipes and similar tubular objects using the guided wave testing (GWT) method, including set-up, data collection and basic interpretation of the data. It is intended to be read in conjunction with BS 9690‑1.

NOTE 1 Some background to the GWT method is given in Annex A.

This part is applicable to the testing of ferritic carbon and low-alloy steel pipes (tubes used for the transport of fluids) and structural tubulars (tubes used for load-bearing constructions) in the diameter range 1 inch (25 mm) to 60 inches (1.52 m), with maximum wall thickness of 2.2 inches (55 mm).

NOTE 2 The term “pipes” is used throughout this document to mean pipes, pipelines and structural tubulars within this scope of materials and dimensions.

This part of BS 9690 is applicable to the use of the GWT method using the pulse-echo technique with the transducer mounted on the outside of pipes for which the testing is straightforward. Advanced cases, in which the factors listed in Clause 4, items a) to i), are encountered so that the testing is not straightforward, fall outside the limitations of the scope as given above. For such cases, additional provisions are necessary.

For some of the advanced cases that are currently not covered by BS 9690 it might be possible to inspect using specific instructions provided by the GWT equipment manufacturers. These instructions are likely to differ between manufacturers according to the details of the equipment. Such instructions are referred to here as “supplementary instructions”. The intention is that some of these advanced cases will eventually be covered by other parts of BS 9690 as commonly accepted approaches emerge.

For those advanced cases that are not covered by other parts, it is necessary for supplementary procedures to be added to those specified in this part of BS 9690. It is necessary for any such supplementary procedures to be documented and agreed between the inspector and the clients [see 5.2, item a)].