noted-

The test requirements of this standard are transverse tensile (except for small diameter pipe), bend tests and nick break tests for butt welds and nick break tests for fillet welds.

Again, this limited degree of testing is generally acceptable because of the control exercised on the design and selection of materials and because a pipeline is a well defined and well understood 'structure'. In some special circumstances (e.g. very high yield strength steels, pipelines for arctic conditions or subsea pipelines) more extensive procedure testing is desirable particularly in terms of guaranteeing fracture properties or maximum HAZ hardnesses. In these cases API 1104 is not a sufficient standard for procedure approval.