API STD 5T 1 ADD 1:2003

The purpose of this standard is to provide definitions of imperfections and defects that occur in steel pipe; no criteria as to severity are addressed. The word imperfection as used herein refers to metallurgical and other features of steel pipe products, which may or may not be injurious to the use of the product. Definition of injuriousness is outside the scope of this document. Defects are defined in the respective pipe standards. It should be noted that the definitions are listed in English, French, German, Italian, Japanese, and Spanish.