{"id":271,"date":"2020-09-16T09:27:29","date_gmt":"2020-09-16T05:27:29","guid":{"rendered":"http:\/\/www.sparsteel.com\/blog\/?p=271"},"modified":"2023-04-20T08:05:00","modified_gmt":"2023-04-20T04:05:00","slug":"what-are-erw-gp-gi-ms-pipes-tubes-their-manufacturing-uses","status":"publish","type":"post","link":"https:\/\/www.sparsteel.com\/blog\/what-are-erw-gp-gi-ms-pipes-tubes-their-manufacturing-uses\/","title":{"rendered":"What are ERW pipes, GP pipes, GI pipes, MS PIPES & Tubes | Their Manufacturing & Uses"},"content":{"rendered":"\n
\"erw
ERW pipes<\/figcaption><\/figure>\n\n\n\n

There are some basic differences in the dimension, manufacturing, and uses of ERW\/GP\/GI\/MS Pipes & Tubes, such as<\/p>\n\n\n\n

ERW PIPES AND TUBES <\/strong><\/h2>\n\n\n\n

ERW stands for \u201celectric resistance welded\u201d. ERW pipes and tubes are manufactured by rolling metal and then welding it longitudinally across its length. ERW pipes have a welded joint in their cross-section. It is manufactured from Strip\/Coil and can be manufactured up to 24\u201d OD. High-frequency Induction Welding Technology is used for ERW Pipes &Tubes up to 21 inches OD. ERW pipe cold formed from a ribbon of steel pulled through a series of rollers and formed into a tube which is fused through an electric charge. It is mainly used for low\/ medium pressure applications such as the transportation of water \/oil.\u00a0Spar Steel<\/strong><\/a>\u00a0is one of the leading ERW Stainless Steel Pipes and tube manufacturers and exporters to the Middle East and other MENA countries.<\/p>\n\n\n\n

Common sizes for ERW Steel Pipe and tubes are made in a variety of lengths to over 100 feet. Surface finishes are available in bare and coated formats and processing can be handled on-site to customer specifications.<\/p>\n\n\n\n

Spar Steel\u00a0is the\u00a0leading scaffolding company<\/strong>\u00a0for the supply of quality products in different ranges and dimensions of ERW\/GI\/GP Pipes and tubes in the Gulf, Dubai, UAE, and other MENA countries.\u00a0Spar Steel\u00a0is known and trusted for manufacturing with the latest advanced technology a wide range of steel pipes and tubes like MS\/ERW Pipes\/Black Pipes \/GP\/GI Pipes\/GIS Tubes\/Galvanised Pipes\/Galvanised Tubes \/ARAMCO Pipes & Tubes, etc. based on international parameters.<\/p>\n\n\n\n

GI\/GP\/MS PIPES AND TUBES<\/strong><\/h2>\n\n\n\n
\"GI
Scaffolding Tubes<\/figcaption><\/figure>\n\n\n\n

GI Pipes<\/strong> and Tubes<\/strong><\/h3>\n\n\n\n

GI stands for \u201cgalvanized iron\u201d<\/strong>. Thus, GI pipes<\/strong> are galvanized iron pipes,<\/strong> or called coated iron pipes in old terminology.\u00a0GI\u00a0carbon steel pipes are immersed in a galvanic (zinc) bath. GI\u00a0(Galvanized Iron)\u00a0Pipes\u00a0are classified into 3 grades based on their weight per meter and inner diameter thickness. The more thickness, the better the performance, and durability. According to IS 1239, each\u00a0pipe\u00a0shall bear a color strip across the circumference for identifying the \u201cclass\u201d of the\u00a0GI pipes. These\u00a0pipes\u00a0are cheaper, lightweight, and easy to handle.<\/p>\n\n\n\n

Difference between GI and GP pipes<\/h3>\n\n\n\n

The full Form of GP pipe is \u201cGalvanized Pipe\u201d<\/strong>. GP Pipes are made of thin sheets of carbon steel electroplated with zinc and then rolled into pipes.\u00a0GP\u00a0pipes<\/strong> are superior to\u00a0GI\u00a0pipes<\/strong> in terms of finish. Galvanized pipes <\/strong>are dipped in a protective zinc coating to prevent corrosion and rust.\u00a0This piping\u00a0was commonly installed in homes built before 1960. When the galvanized pipe\u00a0was invented, it became an alternative to lead\u00a0pipe\u00a0for water supply lines.<\/p>\n\n\n\n

Galvanized pipe <\/strong>and tube,<\/strong>\u00a0covered with zinc, increases the\u00a0pipes and tubes\u00a0life expectancy and make them more resistant to corrosion and mineral deposits in the line. It is a plumbing material that is\u00a0used\u00a0in water supply lines and has been\u00a0used\u00a0in homes for years.<\/p>\n\n\n\n

MS Pipes<\/strong> and Tubes<\/strong><\/h3>\n\n\n\n
\"Galvanized
Square Tubes<\/figcaption><\/figure>\n\n\n\n

MS<\/strong>\u00a0stands for \u201cMild Steel.\u201d And so,\u00a0MS Pipes<\/strong>\u00a0are made from\u00a0mild steel<\/strong>\u00a0they can easily be welded and formed in various shapes and sizes for pipelining and\u00a0tubing\u00a0purposes. These are generally used for drinking water supply i.e. Plumbing, Firefighting, and HVAC but can also be used in various other Industrial and Engineering applications.<\/p>\n\n\n\n

Mild steel\u00a0pipe\u00a0refers to the content of less than 0.25% carbon steel because of its low strength, low hardness, and softness. MS\u00a0pipes or tubes contain a small amount of carbon (0.18% or less)\u00a0steel.<\/p>\n\n\n\n

Mild Steel Pipe <\/strong>and MS Tubes<\/strong> conforming to IS:1239 Part I (1\/2\u201d to 6\u201d NB \u2013 A-Class, B Class OR C Class) large-diameter Mild Steel Pipes confirming to IS:3589 Grade FE 330 or GR FE 410 (up to 20\u2033, 508mm as per required wall thickness.)<\/p>\n\n\n\n

MS Steel Black Pipes<\/strong> and Tubes<\/strong><\/h3>\n\n\n\n

Mild Steel<\/strong>\u00a0Black Pipes<\/strong>\u00a0are called\u00a0MS Black Pipe<\/strong>\u00a0because it is not galvanized and is an ideal product to be welded into\u00a0pipes, tubes, and other kinds of tubing. It is one of the cheapest metals available in the market and can last up to 100 years if placed in a well-maintained environment.<\/p>\n\n\n\n

Sparsteel produces high-quality laser-welded pipes and tubes from 0.19 mm to 152.4 mm diameter, and various other sizes of Round Tubes, Square Tubes, and Rectangular Tubes that can be used for any application requiring the greatest performance, durability, strength, and security.<\/p>\n\n\n\n

PIPE AND TUBE MANUFACTURING PROCESS<\/strong><\/h2>\n\n\n\n
\"pipes<\/figure>\n\n\n\n

Steel pipes are long and hollow tubes that are used to convey products like liquid, gas, etc. from one place to another. They are produced mainly by two distinct manufacturing methods which result in either a\u00a0welded pipe\u00a0or\u00a0a seamless pipe. In both manufacturing methods, raw iron or steel is first cast into a more workable starting form (i.e. hot\u00a0billet\u00a0or flat strip). It is then made into a pipe by stretching the hot steel billet out into a seamless pipe or forcing the edges of a flat steel strip together and sealing them with a weld. In this heading, we will discuss the various methods involved in welded pipe manufacturing along with its history.<\/p>\n\n\n\n

In the beginning, pipe, and tube were manufactured by hand \u2013 by heating, bending, lapping, and hammering the edges together. The historical evidence pointed out the first automated pipe manufacturing process was introduced in 1812 in Britain (England).<\/p>\n\n\n\n

 And manufacturing processes of Pipes and tubes have continually improved since 1812 with the invention of scientific methods, materials, and technology. Some of them for pipe manufacturing techniques are given below:<\/p>\n\n\n\n

Lap Welding Pipe and Tube Manufacturing Process<\/strong><\/h3>\n\n\n\n

Lap welding<\/strong> was introduced in the early 1920s for the manufacturing of pipes and tubes. But now this technique is no longer in use. However, some pipes that were manufactured using the lap welding process are still in use today.<\/p>\n\n\n\n

In the process of lap welding manufacturing, steel was heated in a furnace and then rolled into the shape of a cylinder. The edges of the steel plate were then \u201cscarfed\u201d. During the scarfing process overlaying the inner edge of the steel plate, and the tapered edge of the opposite side of the plate was involved. The seam was then welded using a welding ball, and the heated pipe was passed between rollers which forced the seam together to create a bond.<\/p>\n\n\n\n

The welds made by lap welding are not as reliable as those made by modern methods later on. The American Society of Mechanical Engineers (ASME) has developed an equation for calculating the allowable operating pressure of the pipe, based on the type of manufacturing process. This equation has a variable known as a \u201cjoint factor\u201d, which is based on the type of weld used to create the seam (edge) of the pipe. Seamless pipes have a joint factor of 1.0. The lap welded pipe has a joint factor of .6.<\/p>\n\n\n\n

ERW<\/strong> Pipes and Tube Manufacturing Process<\/strong><\/h3>\n\n\n\n
\"erw<\/figure>\n\n\n\n

In the Electric resistance welded<\/strong> (ERW<\/strong>) manufacturing process, the pipe is manufactured by cold-forming a flat sheet of steel into a cylindrical shape. Then the current is passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without welding filler material.<\/p>\n\n\n\n

\"Electric<\/figure>\n\n\n\n

Several Electric Resistance Welding (ERW) processes are available for pipe production.\u00a0The two main types of ERW manufacturing processes are:<\/p>\n\n\n\n

  1. High-Frequency Welding Process<\/li>
  2. Rotary Contact Wheel Welding Process<\/li><\/ol>\n\n\n\n

    1. High-Frequency Welding <\/strong>Process<\/strong><\/h3>\n\n\n\n

    In the beginning, this manufacturing process used low-frequency A.C. current to heat the edges. This low-frequency process was used from the 1920s until 1970. In 1970, the low-frequency process was superseded by a high-frequency ERW<\/a> process which produced a higher-quality weld.\u00a0As time passed, the welds of low-frequency ERW pipe were found to be susceptible to selective seam corrosion, hook cracks, and inadequate bonding of the seams, so low-frequency ERW is no longer used to manufacture pipe. The high-frequency ERW process is still being used in pipe manufacturing.<\/p>\n\n\n\n

    There are two types of High-Frequency ERW manufacturing processes, such as<\/strong><\/p>\n\n\n\n