Carbon steel pipe — CS pipe in procurement shorthand — is the backbone of global oil and gas, industrial, and infrastructure piping systems. More carbon steel pipe is installed each year than all other pipe materials combined. The category spans everything from schedule 40 general-purpose pipe to he

DSAW — Double Submerged Arc Welded — is the welding variant that defines most large-diameter, heavy-wall line pipe used in gas transmission, offshore pipelines, and major crude oil trunklines. The name refers to the two-pass weld sequence: an inside weld first, then an outside weld, ensuring full th

ASTM A234 WPB is the de-facto standard for carbon steel butt-welding pipe fittings in moderate-temperature pressure piping. If you've ever specified an elbow, tee, reducer, or cap for a process plant, refinery, or power station carbon steel piping system, the fitting was almost certainly A234 WPB. I

Seamless carbon steel pipe — abbreviated as SMLS pipe in purchase orders and mill certificates — is the go-to specification for pressure-critical, high-temperature, and corrosive service piping. With no weld seam to act as a potential stress concentration or corrosion initiation site, seamless pipe

LSAW pipe — longitudinal submerged arc welded pipe — is the material of choice for large-diameter, high-pressure oil and gas transmission pipelines. Where ERW pipe serves the gathering and distribution world in diameters up to 24 inches, LSAW takes over from 16 inches upward, handling the heavy-wall

ERW pipe — electric resistance welded pipe — is the most widely manufactured form of steel pipe in the world. It is the pipe that runs beneath your city streets carrying gas and water, the gathering lines on onshore oil fields, and the casing strings in thousands of wells. Understanding what ERW mea