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Lap Joint Stub End BW fittings

Lap joint stub end usually used with lap joint flange.BW fittings are welding with the end of pipes.Butt welded fittings are popular because of the strong and permanent connections.

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Lap joint stub end is generally a section of the lap joint flange.The stub end of the stainless steel is matched with the carbon steel flange to form a lap joint flange.


The end of Butt welded (BW) fittings are connected to the pipe system by butt welding.Butt weld fittings provide permanent leak-proof performance.BW fittings could made from seamless or welded pipe,and then through several processes formed to get the shape of pipe fittings.


Product features
The usage of lap joint stub end makes flanges can be rotated which is beneficial for aligning bolt holes. It also can adapt different thickness and material grades pipe to be connected.
where constant disconnection and dismantling of pipes are needed, are benefited through these fittings as they give a quick disassembly, allowing inspection and cleaning of pipeline.
Lap joint stub end do not need to be of the same material as pipes and short ends, but can be of lower grade, thereby reducing the total cost of flange joints in high material grade piping systems.
Because the lap joint stub end can be rotated to facilitate the alignment of bolt holes, the installation process is accelerated.

Applications where rotating back flanges are preferred (to facilitate bolting)
The most widely used fabrication tool for stub ends is the flaring machine, which is able to flare the end of the pipe and then cuts it to length.



Shape  Stub End
Size Range 1/2″ – 80″ / DN15 – 2000
Thickness Schedule SCH 10,SCH 10S, SCH 20, SCH 40,SCH 40S, STD, XS,SCH 80, SCH 80S, SCH 100, SCH 120, SCH 160, XXS
China Standard GB/T12459, GB/T13401, HG/T21635/21631, SH3408/3409
America Standard ANSI / ASME B16.9 / MSS SP 43
apan Standard JIS B2311/2312/2313
Europe Standard EN10253
Carbon Steel Q235, 20#, 35#, 45#, 20G,ASTM A234 WPB/WPC
Low Temp Carbon Steel Q345B, 16Mn, ASTM A420 WPL6
Pipeline Steel ASTM A860 WPHY 42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A234 WP11 / WP12 / WP 5 / WP9 / WP91 / WP92,15CrMoG, 12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5
Stainless Steel ASTM A403 WP304/304L/304H, 316/316L, 310S, 321, 317,347,904L
Duplex Stainless Steel ASTM A815 S32205, S31803, 32750, 32760



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