scope:

Defence Standard 02-729 'Requirements For Non-Destructive Examination Methods' comprises:

⎯ Part 1 Radiographic

⎯ Part 2 Magnetic Particle

⎯ Part 3 Eddy Current

⎯ Part 4 Liquid Penetrant

⎯ Part 5 Ultrasonic

This Defence Standard (Def Stan 02-729 Part 5) covers the procedures and methods to be used for the Quality Assessment of Ultrasonic Examining Authorities and for the Ultrasonic Examination of welded and brazed joints, cast and wrought materials, weld metal cladding, pipes and tubes in HM Submarines and Surface Ships not in Class. The methods described are the minimum requirements for the detection of surface and sub-surface imperfections and for the measurement of plate, and tube wall, thickness.

This standard also includes the minimum requirements for the ultrasonic examination of RN GRP structures for the detection of delamination(s).

This standard does not contain acceptance criteria for any imperfection thus revealed.

The effective application of ultrasonic examination techniques and methods described in this standard may be restricted in materials with inherently high or variable attenuation or which produce severe scattering of the ultrasonic beam. Complex shapes may also limit satisfactory application and the examination is to be applied at stages during manufacture when the geometry of the component is relatively simple, provided that subsequent specified treatments of the material do not render the examination ineffective.

This standard does not specify the extent to which ultrasonic examination is required. This will be stated in the Contract Documents.

This Defence Standard does not apply to nuclear plant and machinery to which DG Ships/PS/5108 applies.

A check off list of what relevant issues should be addressed in the Contract is given at Annex A.