ASTM A691 91 Pipe specification includes electric fusion welded along with filler metal added, alloy steel pipe and carbon. Also, it is fabricated by analyzing its pressure vessel plate as well as strength levels even it is appropriate for high-pressure services at maximum temperature. Perhaps, heat treatment is required to get all the desired mechanical properties and to fulfill with relevant code requirements. Moreover, supplementary requirements are given for utilizing when additional examination and inspection is desired.

The specification of this pipe covers its outer diameter 16 (400mm) and thickness wall goes up to 3 in. (75mm) broad. The pipe also having other dimensions are provided according to user' needs and willing. The pipes are divided as per steel grades and are elected in classes according to which kind of heat treatment it is being given. Its surface treatment method includes galvanized, bare, painting black, anti-corrosion coating and varnished. Also, its ends of different kinds like cut square, coupling, grooved, plain end, beveled, threaded etc. it covers length single random, double random and residue depends on customer's needs.

It is tested using many methods such as eddy current testing, ultrasonic examination, physical and chemical property inspection and hydrostatic testing. ASTM A691 91 Pipe packaging is completed by arranging small pipes in the big bundle with sturdy steel strips and large loose pieces. Also, it is covered with the plastic woven box, which may be comfortable for lifting operation. It is loaded in 40feet to 20feet container and in bulk. If you want special and more reliable packaging of it, you can.