1.1 This specification covers seamless and welded high-strength low-alloy steel pipe NPS 1/2 to NPS 26, inclusive. Pipe having other dimensions may be furnished provided such pipe complies with all ot This specification covers standard requirements for seamless and welded high-strength low-alloy steel pipe NPS ½ to NPS 26, inclusive. The material shall be utilized in pressure piping service, and other general purp