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Types Of Oil & Gas Pipes: Seamless, Erw, Lsaw


erw pipe that are seamless are made without seam welds and they are made from steel billets that are heated and drilled to create the tubular sections. As a result of seamless pipes being used in the oil and gas industry for types of pipes different purposes, including upstream operations, as well as midstream operations, such as carrying and distributing fluids such as petroleum, gas, slurries, steam, and acids, seamless pipes are used for a variety of different purposes. Process piping is also used in downstream operations,welded pipe such as refinement of oil and gas in secondary production. A seamless pipe can be used pipe types in a wide range of plumbing applications within this industry, including general plumbing applications.



Types of Seamless pipes used in the oil and gas industry are:

  •  Carbon Steel Seamless Pipes in grades such as ASTM A106, A333, A53, and API 5L 
  •  Chrome-moly alloy steel seamless pipes in grades like ASTM A335 Grades P5 to P91 for high temperature and pressure applications.
  • •Stainless steel seamless pipes in ASTM A312 Series of 300 and 400 such as 304, 316, 321, and 347.
  • Duplex and super duplex Seamless pipes in ASTM A790/ A928 with double ferritic and austenitic structure.
  •  Seamless Pipes are available in different nickel alloys such as Inconel, Hastelloy, Cupronickel, Monel, and Nickel.


different types of pipelines  As per the specifications of the ASME B36.10 and B36.19 specifications, the dimensions and weights of seamless pipes for the petrochemical industry are defined in the following specifications (the specifications also apply to welded pipes As per the specifications of the ASME B36.10 and B36.19 specifications, the dimensions and weights of seamless pipes for the petrochemical industry are defined in the following specifications (the specifications also apply to welded pipes):

  • The ASME B36.10 standard covers seamless carbon and low-alloy pipes of sizes (dimensions and weights) between 1/8 inch and 24 inch in diameter and weight.
  • The ASME B36.19 specification, on the other hand, specifies the dimensions and weights of seamless and welded stainless steel, duplex and nickel-alloy pipes

 The nominal pipe size represents the approximate capacity of the gas pipe material seamless pipe to transport fluids and the schedule oil and gas piping indicates the thickness of the pipe. how are pipes made Seamless pipes are available in two types: the nominal pipe size (which represents the approximate capacity of the pipe to transport fluids) and the schedule (which indicates the thickness of the pipe) (for carbon/alloy pipes, the most common schedules are schedule 40, STD, XS, XXS, and for stainless and nickel alloy pipes, the most popular schedules are 10S, 40S, and 80S).

erw tube mill process Those interested in purchasing the ASME pipe size specifications can purchase them online from the ASME website or from IHS’s online store by visiting either the ASME website or the IHS website. 


 The seamless mild steel pipes range in size from 1/8 to 6 inches in lsaw welding pipe diameter, and are manufactured using a number of different processes, such as the so-called “plug mill process” or the “extrusion process” (for small diameters) or the “mandrel mill process” (for larger diameters).

Types Of Oil & Gas Pipes: Seamless, Erw, Lsaw

ERW Pipe (Electric Resistance Welding)

This type 96 steel pipe of pipe is manufactured by using steel coils. These coils are then uncoiled, polished, cut, and then electrically oriented to form the pipe into a shape by aligning the two edges of the coils. The pipes are available in various sizes from 1/2 to 20 inches. It is important to note that ERW Pipes are available in a range of materials, such as carbon steel, which is referred to as ASTM A53, and stainless steel, which is referred to as ASTM A312. The basic recommendations of these pipes are ASME B36.10 and ASME B36.19. In terms of rates and performance, ERW pipes are an appropriate alternative to seamless pipes in terms of cost and performance.

Typical combinations of pipe nominal size and wall thickness are shown in the ASME and API dimensional charts (designated as “schedules”), as well as the weight of the ERW pipe in kg (or pounds).

A few years ago, ERW pipes emerged as a viable alternative to seamless pipes, both in terms of price and performance, as a result of the modern welding technologies adopted by manufacturers of ERW pipes (for example, HFI and HFW, high-frequency welding). As a result of these advancements in welding technologies, seamless and ERW pipes have become interchangeable, at least in certain applications (low/medium pressure and temperature), due to their technical superiority reducing over time. Despite the intrinsic advantage of seamless pipes over coils and plates, there is no doubt that seamless pipes will always benefit from the inherent strength of steel billets.


As can be seen in the picture below, erw carbon steel pipe manufacturer from steel coils that are uncoiled, cut, drilled, processed, welded and tested before they are sent to the end user.

The most commonly used welding technique for oil and gas pipes is the so-called “high-frequency induction technology” (ERW-HFI), in which an induction current is applied to the external surface of the pipe in order to create a robust seam weld which is able to bind the two sides of the steel coil in a very tight manner.

Types Of Oil & Gas Pipes: Seamless, Erw, Lsaw

LSAW Pipe (Longitudinal Submerged Arc Welding)

Submerged arc welding is used to manufacture LSAW pipes. The process involves cutting, bending, and welding steel plates together. Compared to other pipes, LSAW pipes are available in the maximum size range. They are available in sizes between 16 inches and 24 inches, but can also be used for pipelines larger than 24 inches. The two main types of LSAW pipes are described below. The longitudinal type, which includes a single or double straight seam weld, while the spiral type, which includes HSAWs, SSAWs, and SAWLs, is a type of straight seam weld.

It is a requirement that the DSAW pipes contain both a joint weld on the interior and outer sides of the pipe. It is more common for LSAW pipes to have only one seam weld on the outer cover of the pipe. API 5L large-diameter LSAW pipes are commonly used in the oil and gas industry to transport hydrocarbons over lengthy distances. In the oil and gas industry, HSAW or SSAW spiral weld pipes are not as commonly used.


A LSAW pipe is made using the so-called JCOE process in which steel plates are used as a starting material, lsaw pipe mill as shown above.


In order to make an informed decision on whether to use ERW or seamless pipes for a project, there are many factors to consider. Each of the two has different advantages and disadvantages, which should be weighed carefully in order to make an informed decision:


  • In simple terms, seamless pipes are made from a solid block of steel, which doesn’t contain any weld seams that may represent a weak point (subject to corrosion, erosion and general failure) in the pipe.
  • In comparison with pipes that have been welded, seamless pipes have more predictable and precise shapes, both in terms of roundness and ovality.
  • The main disadvantage of seamless pipes is that on the average their cost per ton is higher than the cost of ERW pipes of the same size and grade (seamless vs ERW pipes compete in the range of 2 to 20 inches).
  • It is possible that seamless pipes may take longer to deliver, as there are fewer manufacturers than welded pipes (welded pipes have lower entry barriers than seamless pipes), making delivery times longer.
  • The wall thickness of seamless pipes may vary from one end of the pipe to another. Indeed, the general tolerance for seamless pipes is +/- 12.5%


  • It is generally found that welded pipes are more affordable than seamless pipes (ERW HFI type) due to the fact that they are manufactured using steel coils as feedstock and require a less complex manufacturing process
  • Due to the larger manufacturing base of welded pipes, lead times are shorter than those of seamless pipes
  • It is important to note that welded pipes will always have a consistent wall thickness since they are manufactured using coils (ERW) or plates (LSAW), which are both subject to tight tolerances
  • As a result of the advance of welding technologies in the past ten years, there has been a significant reduction in the number of “defects” that are associated with welded pipes. While this might have been true in the past, it is becoming less and less true as welding technologies are improving.