ASME 16.9 Steel pipe caps are usually welded onto end of pipe that blcok off the piping line system, it has same funtion with plugs blind flanges. It is available in material of carbon steel, stainless steel alloy steel.

Butt weld cap dimensions is 1/2" to 48" thickness covers Sch 10S, Sch 40, Sch 80, Sch 160, STD, XS, XXS. We can manufacture BW CAP in stanadrd of ASME B16.9, MSS SP 43, DIN, JIS EN.

Difference between Steel Pipe Caps Plugs

Connection

Steel pipe caps are used to connect with pipeline by welding screwing. There is one way for plugs that screw on the ends of pipe.

Shape

There are three shapes of steel pipe cap that butt weld cap, socket weld cap threaded cap. While threaded plug have hex head, round head square head.

Standard

Manufacturing standard of pipe cap is ASME B16.9 & ASME B16.11 plug is ASME B16.11

Process

The manufacturing process for threaded plug is forging casting. While for caps, it is hot press cold press forging.

Thread

Threaded cap have female thread while plug is male thread.

Steel Pipe Cap Material Grade

Carbon Steel Cap

ASTM A234 WPB/WPC, ASTM A420 WPL6, ASTM A860 WPHY 42 / 46 / 56 / 60 / 65

Alloy Steel Cap

ASTM A234 WP11 / WP12 / WP5 / WP9 / WP22 / WP91 / WP92, 15CrMoG,12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5

Stainless Steel Cap

ASTM A403 WP304/304L/304H, 316/316L, 310S, 317, 347, 904L, A815 S32205, S31803, 32750, 32760

Inspection Package of Butt Weld Cap

CAP BW SEAMLESS 36 INCH SCH 40 ASTM A234 WPB ASME B16.9

ASME B16.9 Steel Pipe Cap Dimensions

Notes:

1) The configuration of the cap is normal ellipse.

2) Length E applies for the thickness exceeding the Limitting Wall Thickness.For the caps with DN≥650(NPS26), they will be made subject to the sizes agreed between purchaser manufacturer be supplied according to manufacturer's size.

Stainelss Steel Pipe Cap Weight