{"id":240,"date":"2021-05-26T13:47:31","date_gmt":"2021-05-26T13:47:31","guid":{"rendered":"https:\/\/www.siekmann-rohrbogen.de\/pipe-bends\/"},"modified":"2024-01-29T14:59:08","modified_gmt":"2024-01-29T14:59:08","slug":"pipe-bends","status":"publish","type":"page","link":"https:\/\/www.siekmann-rohrbogen.de\/en\/","title":{"rendered":"Elbow made from seamless pipe"},"content":{"rendered":"\n
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SIEKMANN elbows \nspecial. elbow. production.<\/p>\n<\/div><\/div>\n\n

Pipe elbows according to EN 10253, DIN 2605 or ASME B16.9<\/h1>\n\n

Siekmann has been offering pipe elbows made of seamless pipe, steel or stainless steel, in Germany for decades. Our strength lies in the forming of thick-walled pipe elbows as well as in the area of special pipe elbows. In addition, as a manufacturer, we keep a small stock of blanks. In addition, we can also offer you individual items at short notice. We also manufacture new products in small quantities and within very short production times. \n<\/p>\n\n

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Our delivery programme includes seamless pipe elbows with thick walls, special materials, special radii, bends with leg extensions. As well as pipe bends manufactured as 45, 90 or 180 degree bends (intermediate dimensions also possible). We are particularly specialised in the production of pipe elbows with full utilisation (type B) according to the standard EN 10253-2 or 10253-4 or part 2 according to DIN 2605. Our products are used in refineries, power stations, oil drilling platforms, heat exchangers, in mechanical engineering and in many other areas. \n<\/p>\n<\/div>\n\n\n\n

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If you would like to buy pipe bends, please contact us. We will be happy to help you. <\/p>\n\n\n\n

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On our contact page<\/a><\/div>\n<\/div>\n\n\n\n

you will also find a form to request pipe bends directly from us.<\/p>\n<\/div><\/div>\n\n

Delivery programme pipe elbows:<\/h2>\n\n
Outer diameter:<\/td>14,0 mm \u2013 219,1 mm<\/td><\/tr>
Wall thickness:<\/td>1 mm to 50 mm, depending on outer diameter<\/td><\/tr>
Angles:<\/td>15\u00b0, 30\u00b0, 45\u00b0, 90\u00b0, 180\u00b0 and in between<\/td><\/tr>
Type:<\/td>Type 2D, 3D, 5D, long radius (LR), short radius (SR) – further bending diameters can be found under bending diameter<\/td><\/tr>
Standards:<\/td>EN10253 type A and B, DIN 2605 part 1 and 2, ASME B16.9, production according to customer specifications,<\/td><\/tr>
Tolerances:<\/td>In general, we manufacture according to the common tolerances of the pipe elbow standards. However, it is often the case that we also manufacture elbows with narrower tolerances. In this case we have the possibility, for example, to produce the pipe bend with a bending diameter of +\/- 1mm.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

We supply seamless elbows made of carbon steel, high alloy steel or stainless steel. In addition, our extensive experience in heat treatment enables us to form a wide range of materials. By the way, you will find a list of materials in the materials section.<\/p>\n\n

Our production is subject to strict quality controls. Dimensional checks are carried out during the manufacturing process. This enables us to detect faults all the earlier. Siekmann is monitored by T\u00dcV Nord and is ISO9001:2015 certified. Because of this, we can guarantee continuous improvement.<\/p>\n\n

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Materials for elbows<\/h2>\n\n\n\n

Over the years, we have been able to gather a wide range of experience in the field of tube forming. Carbon steels, high-alloy steels and stainless steels are among our processing materials. Below you will find a list of the materials from which we can manufacture elbows:<\/p>\n\n\n\n

EN \/ DIN()<\/h3>\n\n\n\n
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  • P235GHTC1\/2 (St 35.8 I\/ III), P265GH, S355J2H<\/li>\n\n\n\n
  • 16Mo3 (15Mo3), 10CrMo9-10 (10CrMo910), 13CrMo4-5 (13CrMo44)<\/li>\n\n\n\n
  • X11CrMo5, X11CrMo9-1, X20CrMOV11-1, X10CrMoVNb9-1, X10CrWMoVNb9-2, 7CrMoVTiB10-10<\/li>\n\n\n\n
  • P215NL (TTST35N\/V), 12Ni14 (10Ni14)<\/li>\n\n\n\n
  • P355N (StE355), P355NH (WStE355), P355NL1 (TStE355), P355NL2<\/li>\n\n\n\n
  • L290NB (StE 290.7), L360NB (StE 360.7)<\/li>\n\n\n\n
  • 1.4301, 1.4306, 1.4361, 1.4362 (Lean Duplex), 1.4401, 1.4404, 1.4410, 1.4435, 1.4436, 1.4439, 1.4462 (Duplex), 1.4466 (Super Duplex), 1.4501, 1.4539, 1.4541, 1.4547, 1.4550, 1.4571 1.4841, 1.4749, 1.4828, 1.4878, , 1.4876, 1.4952, 1.4835, 1.4877, 1.4910<\/li>\n<\/ul>\n\n\n\n

    ASME<\/h3>\n\n\n\n
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    • WPA, WPB, WPC, WP1, WP5, WP9, WP11, WP12, WP22, WP32\/27, WP91, WP92, WP304, WP304 H, WP304L, WP310, WP316, WP316L, WP316TI, WP321, WP347, WP347H<\/li>\n\n\n\n
    • \u00a0WPL 3, WPL6, X42, X52, WPHY52, WPHY60<\/li>\n\n\n\n
    • S30815, S31000, S31050, S31500, S31726, S31803, S32760, N08904<\/li>\n\n\n\n
    • Alloy 800H, DMV310N<\/li>\n<\/ul>\n<\/div><\/div>\n\n
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      Standards for fittings and pipe bends<\/h2>\n\n\n\n

      EN 10253-2<\/h3>\n\n\n\n

      This is the current standard for fittings for welding in unalloyed and alloyed ferritic steels with special test requirements. Several DIN standards for different fittings have been combined into one European standard. Furthermore, the pipe bend part is decisive for us here. We deliver according to the types 2D, 3D, 5D and also many special radii in between. Furthermore, EN 10253-2 also includes a part for elbows with full utilisation (type B). “Type B” elbows have a significantly increased wall thickness on the inside of the elbow compared to the wall thickness at the welding ends, as the inside of the elbow is the most heavily stressed area in an elbow. The standard also includes various options that can be specified. <\/p>\n\n\n\n

      For example: Option 15 – Each fitting shall be hardness tested.<\/p>\n\n\n\n

      EN 10253-4<\/h3>\n\n\n\n

      This standard deals with fittings for welding made of austenitic and austenitic-ferritic (duplex) steels with special test requirements. For the most part, this standard corresponds to EN 10253-2. In addition, however, there are, for example, occasionally different bending radii compared to EN10253-2. Consequently, our team will be happy to inform you about the differences. The options explained in EN10253-2 are also included in -4. However, they differ fundamentally.<\/p>\n\n\n\n

      Option 15: An inspection certificate 3.2 according to EN 10204 shall be issued.<\/p>\n\n\n\n

      DIN 2605<\/h3>\n\n\n\n

      DIN 2605 is the former pipe bend standard that has now been replaced by EN10253. Here, different wall thicknesses apply to the elbows with full utilisation compared to the new standards. This standard is also not as comprehensive as EN10253 and only includes a section on elbows and no other fittings.<\/p>\n\n\n\n

      ASME B16.9<\/h3>\n\n\n\n

      This standard contains all technical delivery conditions for fittings manufactured according to ASME standard. Among other things, here is also a part for the elbows. The wall thicknesses are given in “schedule” series and the outside diameters in inch dimensions.<\/p>\n<\/div><\/div>\n\n

      What is a pipe bend?<\/h2>\n\n
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      A pipe bend is a pipe fitting that is used to enable changes of direction in pipework systems. There are various types of pipe bends, which can differ in terms of outer diameter, wall thickness, bending radius, angle and material. They are typically made from either welded half-shells or seamless pipe. Pipe bends are used in various areas such as power plant construction, mechanical engineering, heat exchanger and plant construction, and more.<\/p>\n\n

      Pipe Elbow Type A – Type B Difference<\/h2>\n\n

      Type A pipe bend:<\/h3>\n\n

      The fittings have the same wall thickness at the weld ends as at the bend body. The resistance to internal pressure is less than that of a pipe of the same outside diameter, wall thickness and material. For this reason, they are also referred to as pipe bends with reduced serviceability. The wall thickness of the whole fitting body and the pipe connection must be at least -12.5% of the normal wall thickness.<\/p>\n\n

      Type B pipe bend:<\/h3>\n\n

      The fittings have an increased wall thickness on the inside of the bend body. The internal compressive strength is equivalent to that of a pipe of the same outside diameter, wall thickness and material. For this reason, it is also referred to as a pipe bend with full utilisation. The wall thickness on the inside of the bend must be increased compared to the wall thickness of the joint. The required wall thickness is calculated using a complex formula that takes into account the outside diameter, the wall thickness and, in particular, the bend diameter. As a result, pipe bends with particularly narrow bend diameters require significantly increased wall thicknesses on the inside.<\/p>\n\n

      Difference between EN10253-2 and EN10253-4<\/h3>\n\n

      The EN10253-2 and EN10253-4 standards classify pipe bends into two different types, whereby they are given different designations in the current standards. In EN10253-2, they are designated as type A and type B, while EN10253-4 designates them as type A and type B.<\/p>\n\n

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      Seamless elbow 76.1 x 12.5 – 2D Bending diameter 126<\/p>\n\n\n\n

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      Type A Wall thickness inside: 11.0 mm<\/strong><\/p>\n<\/div>\n\n\n\n

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      Type B Wall thickness inside: 16.8 mm<\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n

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