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Weld Nipple Fittings

Weld Nipple Fittings

Weld nipple fittings are manufactured as per relevant as per industry standards such as DIN : 2353, DIN 3851, ISO : 8434 -1, ISO : 8434 – 4, IS:8805, BSI 5200, JIC, SAE J 514 / ISO 8434-2 etc.

Weld nipple fittings are guaranteed interchangeable with products of other manufacturers corresponding to DIN 2353 in India and / or abroad.

Weld nipple Fittings are manufactured in Steel, Stainless Steel 304/316 & Brass. O-ring supplied with the fitting is made of NBR (e.g. Perbunan) having shore hardness of 90º + 5º & temperature range of -35º up to +100º C.FPM (e.g. Viton -25º up to +200º C) can also be supplied on request.

Weld nipple fittings are used for very high pressure application areas such Steel plants , Shipyards.

Weld nipple fittings are in Complex shapes such as elbows, tees, etc are manufactured from hot forging, which has obvious advantage over plate in extreme strength & high impact resistance.

Weld Nipple fittings with an O-ring seal between weld nipple and fitting body give impressive tear out resistance and sealing integrity.

Weld nipples fittings conform with DIN 3865 form A Fitting bodies and nuts are fully interchangeable for weld nipple and for 2/progressive ring fittings of the same series and external tube diameter.

weld nipple fittings Materials and surface protection Steel phosphated and oiled, O-ring of NBR (e.g. Perbunan). Stainless steel 1.4571, O-ring of FPM (e.g. Viton)

weld nipple fittings Welding suitability and weld ability Weld nipples, tube bend weld nipples and ASK types made of steel are weldable according. to usual techniques. Types made of 1.4571 (stainless) are suitable for arc welding. The welding filler should be selected in accordance with DIN 8556 part 1 with consideration of the type of application and the welding technique.

Nominal Pressure (PN) of complete weld nipple fittings The nominal working pressure (PN) of a complete weld nipple fitting is dependent upon the least rated component, i.e. tube, weld nipple or fitting. The component out of these three with the lowest rated pressure or working pressure determines the nominal pressure (PN) of the complete fitting.

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Permissible temperature range
Assembly process

For weld nipples fittings, tube bends with weld nipples and ASK types of steel with O-rings of

  • NBR (e.g. Perbunan): –35°C to + 100°C
  • FPM (e.g.viton): –25°C to + 200°C
  • Cut off the tube square, deburr and bevel the end of the tube in conformance with DIN 2559.
  • Slide nut onto the weld nipple.
  • Weld nipple to the tube according to normal welding procedure. The tube and nipple must be aligned. Before welding, please remove the nut.
  • Dress the weld on the inside and outside.
  • Fit the O-ring without twisting. The taper, the nut and the cone must all be clean.
  • Oil the nut, taper and cone and thread before assembly
  • Screw on the nut by hand. Fully tighten using a spanner with 1/4 to 1/2 turns. Make sure that the tube with the weld nipple is assembled straight and without in built stress.

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