Module pipe 

American National Standard taper pipe threads, NPT (ASME B1.20.1), from 1/16 to 2 inch, in millimetres: a 60° thread on a cone tapering 1 in 16 on the diameter, so that its radius changes by TAPER per unit of length.

Each size is given by its threads per inch, the pipe’s outside diameter, the pitch diameter E0 at the small end of the external thread (the pipe’s end), the hand-tight engagement L1 and the effective thread length L2. An internal thread is cut so that a pipe screwed in by hand reaches L1 in: its pitch diameter at the face it is tapped from is E1 = E0 + L1 / 16. The thread is h = 0.8 P high, truncated equally at its crest and its root from the sharp V of height H = 0.866 P, so its major and minor diameters are h either side of the pitch diameter.

A tapped hole for it is reamed to the taper, its diameter at the face the minor diameter there, E1 - h.

Structs

PipeSize

One size of NPT.

Constants

SIZES

The sizes of ASME B1.20.1 Table 2 from 1/16 to 2, smallest first.

TAPER

How much an NPT thread’s radius changes per unit of length: half its taper of 1 in 16 on the diameter.

Functions

npt

The size called name: 1/2.