API 1104 does not predefine the diameter or wall thickness ranges/limits for welding procedures when they are qualified to the section 5 and 12 requirements which covers all welding processes except welds that will be evaluated to the Appendix A ECA weld acceptance criteria. It is up to the owner company or contractor to set the wall thickness and diameter ranges. Many used the suggested limits which are the ones specified for welder qualifications. API 1104 does consider wall thickness range/group an essential variable; therefore, once the wall thickness range is specified on the WPS, it cannot be changed without qualifying a new procedure. The diameter range is not an essential variable and therefore it can be changed without qualifying a new procedure.
Only welder qualifications have defined diameter and wall thickness limits for single qualification. Diameter 2.375" - 12.75"; greater than 12.75". Wall thickness 4.8mm - 19.1mm; greater than 19.1mm.
On Sat, Mar 12, 2011 at 5:04 AM, vijay kumar <vijaykumaar80@gmail.com> wrote:
Dear All,
i have a pqr 20" thk 11.91 mm as per api1104 ,for the production weld
we can apply this to 10" pipe of same grade material.
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