Depending on the construction features, the following pipe cap types are found:
- Threaded Caps: Threaded pipe caps have female threads to fit the pipe end with the caps. The thread can be straight or tapered.
- Welded Caps: Welded pipe caps can be either butt welded or socket welded caps.
- Tapered Caps: These types of pipe caps have tapered sides that help in a close fit. Tapered caps can be used as a multi-functional pipe fitting and can be used with male and female NPT threads, male straight threads, and straight tubes and bars.
- Anti-roll Caps: These pipe cap types are round in shape but with a square end to prevent pipes and tubes from rolling.
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Pipe Cap Standards
ASME B16.9 provides pipe dimensions, ratings, testing, tolerances, and marking requirements for Steel Piping cap fittings. Usual pipe end caps are manufactured from NPS 1/2 inches through 48 inches with pipe schedules 10, 20, 30, STD, 40, 60, 80, XS, XXS, 100, 120, 140, and 160 as applicable. Other pipe end caps standards are:
- ASME B16.11
- DIN 2617
- DIN 28011
- MSS SP 43
- EN 10253
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