Seamless Pipe Manufacturers in Pakistan: ERW & LSAW Oil & Gas Pipes

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Seamless Pipe Manufacturers in Pakistan
Seamless Pipe Manufacturers in Pakistan

Familiarize yourself with the three types of Seamless Pipe Manufacturers in Pakistan use in the petrochemical industry. Seamless, ERW (electric resistance welding) and LSAW (vertical submerge arc welding). Seamless pipes are produce by pulling the billet. Through solid drill rods. 

Seamless Pipe Manufacturers in Pakistan

Seamless Pipe Manufacturers in Pakistan are made of heat treatment ingots and are drill to form the pipe section. The word seamless means no pimples.

  • Seamless steel pipes are use in various applications in the oil and gas industry.
  • Upstream operation (OCTG tube)
  • Aquatic environment (transfer and distribution of liquids such as oil, gas, vapors, acids and slurries)
  • Downstream (pipeline process for refining oil and gas derivatives)
  • Public plumbing for municipal services
  • The most common types of pipes in the oil and gas industry are:
  • ASTM A53, A106, A333 and API 5L (types of carbon steel pipes for hot and cold carbon steel)
  • The ASTM A335 grade P5 to P91 (chrome-molybdenum alloy steel pipe for high temperature and pressure) for use in refineries and power plants)
  • ASTM A312 300 and 400 series (stainless steel pipes 304, 316, 321, 347)
  • The ASTM A790 / A928 (two-phase and super-two-phase pipes with dual ferrite and austenite structures)
  • Material specifications for different nickel alloys (Inconel, Hastelloy, Cupronickel, Monel, Nickel 200)
  • Specifications of non-ferrous pipes (aluminum, copper, brass, chronicle)

Some requirements are for seamless pipes only (such as ASTM A106). Compatible with seamless and welded pipes (such as ASTM A53).

Carbon Steel Pipe

Carbon steel pipes (A53, A333, A106, API 5L) have the largest market share. The main application of Seamless Pipe Manufacturers in Pakistan is because it can be use for high and low temperature applications. (And higher grades are use as an increase in temperature and pressure or if the transport fluid is more aggressive). In the upstream oil and gas industry, API 5CT is the main specification for OCTG (Petroleum Domestic Pipeline) pipes.

Do not confuse Seamless Pipe Manufacturers in Pakistan with seamless steel pipe. In fact, there are important differences between pipes and tubes. Not only does this make sense, but the term “pipe” basically applies to all pipes use to transport liquids. On the other hand, the term “pipe” refers to sections of pipe (various shapes, circles, ellipses, squares) that are use in structural / mechanical applications. Measuring systems such as boilers and heat exchangers and pressure equipment in buildings. And heater heater

Seamless pipe prices

Seamless pipes are usually 20 to 30 percent more expensive than ERW pipes due to their higher cost per ton and relatively complex production process. (More obvious than the ERW and LSAW pipe production process) and due to the number of seamless pipes, pipe manufacturers are quite limited. 

For specific sizes and needs (for example, 20 pipes or thick pipes of special or exotic materials, for example ASTM A335 P91 pipes), pipe suppliers are available per tonne (for example). Or per meter) and so in some parts of the world

As a result, estimating the price of a pipe using the standard price per ton of pipe is a misunderstanding. All “carbon steel” or “stainless steel” regardless of actual diameter. Wall thickness and specific grade: All of these factors are consider to avoid cost overruns during future project implementation. In addition, prices fluctuate daily. (Especially alloy pipes containing chemical compounds such as molybdenum, nickel, copper and chromium, which are trade daily on the Seamless Pipe Manufacturers in Pakistan Metal Exchange or ferroalloy market).

Seamless pipe size

  • Specifications ASME B36.10 and B36.19 cover the size and weight of seamless pipes for the petrochemical industry. (This requirement also applies to welded pipes):
  • Specifications ASME B36.10 targets the size of carbonless and low-alloy pipes. (Size and weight) 1/8 to 24 inches
  • Specifications ASME B36.19 Covers the size and weight of stainless steel, duplex stainless steel, seamless nickel alloys and welded pipes.
  • ASME pipe size specifications can be purchase online from the ASME website or the IHS online store.

Available commercial seamless pipes are define by the nominal size of the pipe. (Represents the approximate capacity of the pipe fluid) and uses the “program” to indicate the thickness of the pipe. (Usually Table 40 for carbon / alloy pipes, 10S, 40S and 80S for stainless steel and nickel alloy pipes)

Seamless pipe production process

Soft seamless steel pipes from 1/8 to 6 inches are use for “plug milling process” or “extrusion process” (use for small diameters) and “core milling process” for large diameters. ERW pipe (electric resistance welder)

ERW pipes are produce using steel coils. First the coil is screw. It is then smooth, cut, and finally shap into a tube by electric welding at both ends.

ERW pipes are 1/2 to 20 inches in size and are made of carbon steel (ASTM A53 is a common specification) and stainless steel (ASTM A312). In terms of dimensions, ASME B36.10 and ASME B36.19 are: Key reference requirements (API 5L for welded ERW pipes)

ASME and API size charts show the common combination of nominal pipe size and wall thickness (define as “program”) and show the weight of ERW pipes in kilograms (or pounds).

In recent years, ERW pipes have emerge as an efficient alternative to seamless pipes. The latest welding technologies use by ERW pipe manufacturers in terms of price and performance (such as high frequency welding HFI and HFW) advances in these welding technologies are declining. Over time, the technological advantages of seamless pipes over ERW pipes make them adaptable, at least for some applications. Seamless Pipe Manufacturers in Pakistan benefit from the excellent mechanical strength of the billets. Always relative to the coil and the plate

ERW pipe production process

As shown in the figure below, ERW pipes are first made of un-screw, cut, manufacture, welded and test steel. The most common oil and gas pipe welding technology, “High Frequency Induction Technology” (ERW-HFI), involves applying induction current to the outer surface of the pipe to form a strong connection. Weld the steel coils very tightly on both sides.

LSAW pipe (long submarine welding)

LSAW pipes (“underwater arc welding”) are produce by cutting, bending and welding steel sheets (JCOE process).

There are two main types of LSAW pipes. Vertical (single or double welded seam, DSAW) and helical (call HSAW, SSAW or SAWL pipe). So the difference between DSAW and LSAW is that the DSAW pipe is welded. LSAW pipe has a single seam weld on the outer surface, but the outer seam of the pipe. The ERW pipe is made of winding steel.

LSAW welding pipe

The oil and gas industry uses large diameter API 5L LSAW pipes to effectively transport hydrocarbons over long distances. HSAW / SSAW helical welded pipes are use for non-critical applications such as water delivery and distribution. (Not for oil and gas)

LSAW pipe production process

LSAW pipes are produce in a process call JCOE, which starts with steel plates as shown below. ERW pipe in front of seamless

Advantages and disadvantages of Seamless Pipe Manufacturers in Pakistan

Seamless Pipe Manufacturers in Pakistan are made of strong steel blocks and are not welded. This may indicate a weak area. (Affect by general corrosion, erosion and failure)

Seamless pipes are more predictable and accurate in terms of roundness and oval shape than welded pipes.

The main disadvantage of seamless pipes is that they cost more per ton than ERW pipes of the same size and grade. (Seamless pipes and ERW pipes compete in the range of 2 to 20 inches.)

Delivery time may be longer. This is because the number of seamless pipe manufacturers is less than welded pipes. (Barriers to entry from welded pipes to seamless pipes are less)

Seamless pipes can have conflicting wall thicknesses along the entire length of the pipe. The usual error margin is +/- 12.5%.

Advantages and disadvantages of ERW pipes

Welded pipes are cheaper than seamless (ERW type HFI) because they are produce using steel coils as raw materials in more complex production facilities. The welded pipes have less manufacturing time than seamless pipes. Because the production base is high

The wall thickness of the welding tube is uniform. Both pipes, which are made using coils (ERW) or plates (LSAW), require high bearing control. Main “disadvantage” of welding pipes is that welding is consider a weak factor. This may have been true in the past, but it has become increasingly false due to advances in welding technology over the past decade.

Conclusion

Advance ERW-HFI welded pipes are ideal for seamless pipe in Pakistan. Help end users reduce prices and delivery time by 20-25%. Valve pipes are the most influential factor in the cost of plumbing in factory construction (in principle, pipes cover 5-7% of the total factory cost; pipes make up about 60-70% of this cost, valves 15-25 These are the average standard numbers in the oil and gas industry. Refer to carbon steel materials (stainless steel pipes, two phase, nickel alloy, pipe weight may be larger). Seamless Pipe Manufacturers in Pakistan can have different colors. (Paint on the outside) indicates the type of liquid to be carried.

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