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      Pipe Fittings

   
 

A pipe fittings is defined as a part, used in piping system to change direction or function, which is mechanically joined to the system. Probably the simplest way to achieve this end would be to bend the pipe in the direction required, but this process will stretch and thin the outer wall whilst thickening and wrinkling the inner wall. This results in flow resistance and accelerated wall erosion.

A second method sometimes used is a mitred joint. Where pipe are cut to the correct angle and welded together to achieve the desired change. Whist the cross-section area and wall thickness are maintained a great deal of efficiency is lost due to friction and turbulence resulting from the severe changes is direction; for example a single-mitred bend offers about six times the resistance of a swept elbow.

For these reasons swept fittings are preferred on most piping systems, particularly where internal pressure, flow and corrosion are major considerations.

Butttweld Fitting

TYPES & APPLICATIONS OF BUTT WELD FITTINGS

A piping system using Butt welding Fittings has many inherent advantages over other forms.

  • Welding a fitting to the pipe means that is permanently leakproof.
  • The continuous metal structure formed between pipe and fitting adds strength to the system.
  • Smooth inner surface and gradual directional changes reduce pressure losses, turbulence and minimises the action of corrosion and erosion.
  • A welded system utilises a minimum of space.

 

SEAMLESS BUTTWELD FITTINGS

Seamless butt welding fittings are produced from seamless tube and pipe by either a hot or cold forming process. Seamless butt welding fittings are available in standard sizes, as published in the relevant product tables, and in non-standard sizes. Standard size fittings are generally ex stock.

 

WELDED BUTTWELD FITTINGS

Seam-welded buttwelding fittings

Seam-welded butt welding fittings are produced from hotrolled, annealed and pickled sheet or plate, formed into half shells or segments and longitudinally seam-welded. Seam-welded butt welding fittings are available in standard sizes, as published in the relevant product tables, and in non-standard sizes. Standard size fittings are generally ex stock.

Welding

Welding is carried out by Codequalified personnel (ASME Bailer and Pressure Boiler Vessel Code, Section 9; Lloyds Register of Shipping; TÜV and others) whose qualifications are reguarly checked and approved. Established welding methods include automatic plasma arc, automatic. TIG, pulsed TIG, MIG and shielded-electrode techniques.

Terms of supply

Unless otherwise agreed, seamless butt welding fittings are supplied according to technical delivery condition DIN 86086. Seamwelded butt welding are supplied in the as-welded condition.

End preparation

Square cut and deburred, alternatively: bevelled as specified.

Marking

All butt welding fittings are marked with alloy name, outside diameter, wall thickness and heat number. Additional information like standard and alloy numbers can be added on request.

  • Elbows
    seamless and seam-welded DIN 86090
  • Tee Pieces
    DIN 86088
  • End Caps
    DIN 86011 Edition 10.70
  • Branches
    DIN 86087
  • Reducers
    Reducers concentric/eccentric, seamless and seam-welded, DIN 86089
Material Standards and Grades
Stainless steel elbow ASTM A403 WP Gr. 304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L
Carbon steel elbow ASTM A 234 WPB, WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70
Low temperature carbon steel elbow ASTM A420 WPL3 / A420WPL6
Alloy steel elbow ASTM / ASME A/SA 234 Gr. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91
Duplex steel elbow ASTM A 815 UNS NO S 31803, S 32205
Nickel alloy elbow
  • ASTM / ASME SB 336
  • UNS 10276 (HASTELLOY C 276 Elbow)
  • UNS 2200 (NICKEL 200 Elbow)
  • UNS 2201 (NICKEL 201 Elbow)
  • UNS 4400 (MONEL 400 Elbow)
  • UNS 8020 (ALLOY 20 / 20) CB 3
  • UNS 8825 (INCONEL 825 Elbow)
  • UNS 6600 (INCONEL 600 Elbow)
  • UNS 6601 (INCONEL 601 Elbow)
  • UNS 6625 (INCONEL 625 Elbow)

TWO HALVES BUTTWELD FITTINGS

 
   

 
     
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