PR186-234503-E01 Summary of Substantive Changes between API 1104 Twenty-first and Twenty-second Editions

The application of requirements contained in many industry codes and standards requires some interpretation by the user and by the regulator who is called upon to enforce their use. There are often differences in the way requirements are interpreted because of unclear rationale behind the requirements or novel or non-traditional applications. Some industry codes and standards contain guidance in the form of commentary sections or companion documents. This is not the case for API Standard 1104, Welding of Pipelines and Related Facilities, where requests for interpretation are common because of unclear requirements or an absence of information pertaining to rationale.

This white paper summarizes the changes between the Twenty-first and Twenty-second Editions of API 1104. This white paper may be useful when transitioning welding practices and procedures to the requirements in the Twenty-second Edition from earlier editions of the standard.