SMLS: The abbreviation SEAMLESS means seamless. In fact, the term Manisman refers to the first manufacturer of this type of pipe, and the correct term is Manisman pipe, seamless pipe or seamless, and the term MANNESMANN is not used in any request and is emphasized again. Due to a common mistake in the pipe market, in this article we use the term Manisman pipe instead of seamless pipe or wireless.Size or nps or DN: Indicates the OD or outer diameter of the manganese tube.In requests, when the title is written in size, they must specify the unit, which is denoted by "inches" and "millimeters" by mm. You can see it up to 10 inches in the table below.ASTM: stands for American Society for Testing and Materials, and the number after it identifies the type of Mannesmann pipe material. are:Mannesmann pipe ASTM A 106 GR.B and ASTM A 53 GR.B:These two materials are very similar and the most important difference between them is that ASTM A53 GR.B is produced both as Mannesmann pipe and as welded seam pipe, but ASTM A106 GR.B material is produced only as Mannesmann pipe (seamless). ) Is produced.Is it possible to use Manisman A106 GR.B pipe in sour gas (H2S) condition according to NACE standard?The answer to this question is yes but conditional.Clearly in NACE MR 0175 to A 106 Gr.B is mentioned but pipe A 106 Gr.B that wants to be sent for sour gas conditions must meet the requirements of NACE MR 0175-3 (ANNEX A), ie the percentage of nickel, phosphorus, sulfur must be the maximum specified in this standard and the carbon equivalent is 0.037, although The material of the A106 pipe is made of steel and has a high resistance according to the decay test, but for more certainty, the percentage of sulfur should be measured so that it is not more than one hundredth of a percent.In the market, only API PSL2 pipes are known as sour gas pipes, however, these pipes are very similar to A106 pipes and their main difference is in the impact test at zero degrees, so even API PSL2 pipes can be used. In the presence of sour gas, it must meet the requirements of NACE MR 0175-3 (ANNEX H) standard, API 5L requirements as well as ISO 3183 requirements.This type of pipe is used for high heat and temperature, Manisman A335 pipe has 13 grades, among which 5 grades that are more used include P5, P9, P11, P22 and P91.It should be noted that Mannesmann A335 pipe belongs to the family of Mannesmann alloy pipe.This standard belongs to stainless steel pipes, which is known as steel pipe in the market and its full term is STAINLESS STEEL, and has 3 main categories: A312 TP 316, A 312 TP 304 and A312 TP 321.This type of Manismann pipe is mostly used in corrosive environments or environments with high oxidation.API: stands for American Petroleum Institute and has two main families, PSL1 and PSL2.The most widely used Manismann pipes of this standard are from the PSL1 family and API 5L pipes.Under normal temperature conditions, this pipe and A106 GR B pipe can be used as a substitute for each other, but in high temperature conditions, AP-5L Mannesmann pipe can not replace Manisman A 106 GR B pipe.BE edge: which stands for BEVEL END, is the most common type of mannequin pipe edge, which is angled and is used for better connection of pipes for welding lips or BUTWELD.In the market, this type is called conical edge.PE edge: which stands for PLAIN END, which is flat-shaped and is used for pipes smaller than 2 inches.The reason for not using PE edge in some pipes smaller than 2 inches is that their type of welding is by welding method from 90 degree point or FILLET WELD and it is used to connect Mannesmann pipe to connections with SOCKET edge.Of course, a pipe with PE edge can also be used to connect the Manismann pipe to the SLIP ON flange.TE edge, which stands for THREAD END and means threaded end, and is usually used for small pipes.Of course, when they want the Manismann pipe to be threaded in the application, the type of thread must also be mentioned. One of the most important types of thread is the NPT thread, which is the American standard thread, and the angle between the two threads is 60 degrees in our country. The most requested is the BSP thread type, which is the English standard for thread, also known as G thread, and the angle between the two threads is 55 degrees.For this reason, in some requests where the TE edge type is required, instead of writing TE, only the thread type, such as NPT, is mentioned.Indicates the standard by which the sizing requirements of Manismann pipe can be understood, including NPS or nominal pipe size, OD or outside diameter of pipe, THICKNESS or pipe thickness, pipe length, type and angle of pipe edge and. .. Cited.Among the most important standards for dimensions are ASME B 36.10 and ASME B 16.25 for carbon steel pipes and ASME B 36.19 for stainless steel pipes. Related is also specified.