Seamless Pipe What is seamless pipe? Seamless pipe is produced in sizes from 1/8 to 36" nominal. Seamless pipe has no longitudinal seam or weld when compared to ERW pipe. In simple terms the seamless pipe is produced by piercing a solid round billet leaving behind a hollow seamless pipe....
What is seamless pipe? Seamless pipe is produced in sizes from 1/8 to 36" nominal. Seamless pipe has no longitudinal seam or weld when compared to ERW pipe. In simple terms the seamless pipe is produced by piercing a solid round billet leaving behind a hollow seamless pipe. There are two main methods of producing seamless pipe;
Hot Rotary Piercing
Extrusion Process Method
In Extrusion Process, hot billets of metal are formed into seamless pipe by forcing the billets through extrusion dies and over a forming mandrel.
Hot rotary piercing method is the most common process of producing seamless pipe. In this process hot billets are forced through rotating heavy rollers over a mandrel or piercing plug. The piercing plug creates the hole through the seamless cylindrical billets.
Seamless pipe goes through various finishing operations such as straightening, inspection, hydro testing and imaging. Seamless pipe is widely used in pressure piping, construction, petrochemical and oil refineries. Seamless pipe is available in following specifications;
ASTM A53, A106, A252, A333, A335, A501, A523, A589, API 5L and API 5CT. Most common seamless pipe is A106B and API 5L B
End finish of seam less pipe include plain ends either beveled or square cut. Seamless carbon steel pipe is available in black, bare, galvanized or with epoxy coating.
Steel Pipe Lengths
Generally steel pipe is supplied in 21 ft lengths. It is also available in Single Random Length (SRL) which could be anywhere from 16 ft to 21 ft. Double Random Length (DRL) refers to pipes that is at least 35 ft long and up to 42 ft.
Steel Pipe End Finish
There are five common type of metal pipe end finishes;
Threaded and Coupled
Threaded without Coupling
Plain End - Cut Square
Beveled for Welding - 30 deg bevel
Grooved End - Cut or rolled for mechanical coupling
Coupling for extra strong and double extra strong pipe are taper threaded and recessed for all sizes.
Most common pipe end type is plain end of beveled end. Threaded ends are also available upon request
Steel Pipe Identification and Marking
Steel pipes is available in different classification, grade, weight, schedule number etc. Hence it is important to identify steel pipe marking. Steel pipe is identified by paint stencil or stamped marking on the pipe itself or by a tag attached to it.
Steel Pipe Material
Metal Pipes are available in following material grades;
A106B/A53B/API 5L-X42/API 5L B
Stainless Steel 304
Stainless Steel 316
Super Stainless A20
Duplex Stainless D2205
Nickel Alloy A200
Nickel Alloy A400
Nickel Alloy A600
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