BUTT WELD LAP JOINT STUB END
- Payment Type:
- L/C, T/T
- Incoterm:
- FOB, CFR, CIF
- Min. Order:
- 10 Piece/Pieces
- Min. Order:
- 10 Piece/Pieces
- Delivery Time:
- 18 Days
- Transportation:
- Ocean, Land, Air, Train/TNT/DHL
- Port:
- Beijing Air Port, Tianjin New Port, Zhengzhou Train Station
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Contact Now| Place of Origin: | Cangzhou,China |
|---|---|
| Productivity: | 1000pcs/month |
| Supply Ability: | 1000pcs/month |
| Payment Type: | L/C,T/T |
| Incoterm: | FOB,CFR,CIF |
| Certificate: | ISO/CE/API |
| HS Code: | 73072100 |
| Transportation: | Ocean,Land,Air,Train/TNT/DHL |
| Port: | Beijing Air Port,Tianjin New Port,Zhengzhou Train Station |
What is Lap Joint Stub End Fittings ?
Lap Joint Stub ends are buttweld fittings that can be used (in combination with a lap joint flange) alternatively to welding neck flanges to make flanged connections.
Lap Joint Stub end Fittings are mechanical joints that comprises of two components: The Stub End, which essentially a short length of pipe, which has one end that is flared outwards and the other end prepared to be welded to pipe of the same Nominal Pipe Size (NPS), material and of a similar wall thickness.
Lap joint pipe flanges slide directly over the pipe and are most commonly used with stub end fittings. A pipe is usually welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of lap joint stub end fittings is that there will not be any issues with bolt hole alignment.
Specifications
| Type | Long/Short Lap Joint Stub Ends |
| Standards |
ASME / ANSI – B 16.9 ‘Factory-Made Wrought Buttwelding Fittings’ASTM A234 - Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service. ASTM A403 – ASME SA403 – ‘Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings’ ASME B16.25 – ‘Buttwelding Ends’ ASME B16.28 – ‘Wrought Steel Buttwelding Short Radius Elbows and Returns’ MSS SP-43 – ‘Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications’ |
| Dimension | ANSI B16.9, ANSI B16.28, MSS-SP-43 Type A, MSS-SP-43 Type B, JIS B2312, JIS B2313 |
| Thickness | 2mm – 100 mm / SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS |
| Size | 1/2” TO 24”,or per drawing |
TYPES OF STUB ENDS
Type “A”: this type is produced and machined to fit lap joint flanges.The mating surfaces of the stub end and the lap joint flange have a matching profile and surface. The lap thickness of type A stub ends is > = the minimum wall thickness of the connected pipe. The outside the stub end and the lap joint flange have a matching profile and surface. The lap thickness of type A stub ends is > = the minimum wall thickness of the connected pipe. The outside corner of type A has a radius to accommodate the lap join flange, whereas the inside corner is squared.
Type “B”: this type of stub ends is suited for standard slip-on flanges acting as lap-joint flanges. The lap thickness of type B stub ends is >= the minimum WT of the connecting pipe. The lap of these type of stub ends has generally a serrated face. To ensure tight joints, chamfers on the ID side of the flange are required.
Type “C”: this last type can be used both with lap joint and slip-on backing flanges and are fabricated out of pipes. The lap of C-type stub ends is flared over and the lap thickness is 75% of the connecting pipe WT. Type C has a short fillet outer radius able to host any back up flange.
Materials and Grade
Carbon Steel :
ASTM A234 Gr. WPB
ASTM A420 Gr. WPL6/WPL3.Astm A420 Pipe Fitting
EN10253-2 P235GH P265GH 16Mo3
DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404
Alloy steel :
ASTM A234 wp5 / wp9 / wp11 / wp22 / wp91,A234wp11 Pipe Fitting
ASTM A860 Wphy70/WPHY52/A860 Wphy60/WPHY65/WPHY42
MSS SP-75 WPHY42/WPHY52/WPHY60/WPHY65/WPHY70
13CrMo4-5 10CrMo9-10
Stainless Steel:
ASTM A403 WP316/316L
ASTM A403 WP304/304L
Stub Ends assembly
Stub ends and lap joint flanges can be assembled following this process:
The Lap Flange is slipped over and onto the Stub end Flange.The Stub End Flange is then welded onto a pipe spool, using an approved Welding. Procedure Specification (WPS), by a qualified Welder.The Lap Joint Flange backing Flange, can revolve around the Stub End,which is now attached to the piping spool.
The bolt holes of the Lap Joint Flange can now be orientated and aligned with the bolt holes of a mating Flange of the same ASME designate rating and NPS.
The Lap Joint Flange can be mated to any Flange covered in ASME B16.5, Weld Neck, Slip On, Threaded, Socket Weld, another Lap Joint Flange.
It can also be mated to a fabricated plate Flange with compatible, bolting dimensions.
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