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ASTM A234 WPB BUTT WELDING PIPE FITTING CAP ASME B 16.9 MSS SP43

What is a CAP nipple and what about its specification and advantages.

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What is a BW cap ?

Basically a cap will be applied, to shut down the end of a pipe. The Cap, as it is shown in the image below, is available for all pipe dimensions, and is sometimes also used for other purposes.End Caps are used for blocking off or sealing the end of a pipeline. The end cap is welded on at its weld prep to the relevant sized pipe within the pipeline that requires blocking off/sealing. Once in place, unlike a blind flange that can be unbolted to allow access to the pipeline, the end cap is firmly fixed.

Specification of a BW cap

Size Range 1/2″-48″/DN15-DN1200
Thickness Schedule SCH10-SCH160,XSX
China Standard GB/T12459,GB/T13401,HG/T21635/21631,SH348/3409
America Standard ANSI/ASME B 16.9/MSS SP43
Europe Standard EN10253
Carbon Steel Q235,20#,35#,45#,20G,ASTM A234 WPB/WPC
Low Tem Carbon Steel Q345B,16Mn,ASTM A420 WPL6
Pipeline Steel ASTM A860 WPHY 42/46/46/60/65
Alloy Steel ASTM A234 WP11/WP12/WP5/WP9/WP91/WP92,15CrMoG
Stinless Steel ASTM A403 WP304/304L/304H,316,316L,310S,317,347,904L

Advantages of BW caps

Butt welding capss have the following benefits

  • allow strong, and leak-proof, piping connections
  • minimize pressure drops and the turbulence inside the pipeline
  • have a long service life
  • are rather cheap to purchase and deploy
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