Pipe Threads, NPT and BSP, Read for Sleep

This episode reads three Wikipedia articles aloud, in the order the articles give them: National pipe thread, British Standard Pipe and Pipe thread. It is meant for listening and for sleep. Nothing in it needs to be followed.

National pipe thread

American National Standard Pipe Thread standards are United States national technical standards for screw threads on threaded pipes and pipe fittings. They include tapered and straight thread series. Each type has a full name and an abbreviation, such as NPT, NPS, NPTF or NPSC. NPT is defined by ANSI/ASME standard B1.20.1. The taper rate is 1 inch of diameter in 16 inches of length. The thread has a 60 degree included angle, the same angle as the Sellers thread. NPTF, defined by ASME B1.20.3, is designed to seal without PTFE tape.

British Standard Pipe

British Standard Pipe (BSP) has been adopted as standard in plumbing and pipe fitting, except in North America. Parallel threads are marked G and taper threads are marked R. The thread form follows British Standard Whitworth, with flanks at 55 degrees and rounded crests and roots. At least 41 sizes have been defined. ISO 7 covers threads where the pressure-tight joint is made on the threads, and ISO 228 covers threads where it is not.

Pipe thread

Both systems specify a taper of 1:16. Tapered joints seal through the threads themselves, sometimes with tape or pipe dope. Straight threads rely on an O-ring for the seal.

How it is read

Each section is read under its own heading, and tables are read one row at a time. After each section, a short note says what that section governs and how the other system handles the same thing.

Sources