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
|ANSI/ASME B 16.9/MSS SP43
|Q235,20#,35#,45#,20G,ASTM A234 WPB/WPC
|Low Tem Carbon Steel
|Q345B,16Mn,ASTM A420 WPL6
|ASTM A860 WPHY 42/46/46/60/65
|ASTM A234 WP11/WP12/WP5/WP9/WP91/WP92,15CrMoG
|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