Niel
|
You always want to wrap seal tape around threaded pipe fitting in a clockwise direction.
In most cases for a new joint you should apply only two or three wraps of tape. On older fitting where the threads may be damaged you may consider adding a few more wraps, but keep the number of warps to a minimum.
15 years ago
Source:
|
icekid
ASKED BY
|
hi niel,
im looking for standard wraps of teflon on the threaded pipe, because my sub ordinate always use 1 roll of teflon tape on a single pipe. and it create cracks on the fittings, that why i want to know the proper placing of teflon to prevent leaks on the future due to over placing of teflon.
15 years ago
Source:
|
Niel
|
It is a common mis-perception that more is better.
you should only use just enough tape to ensure that all the cracks, dings and variations between the two internal threads and the external threads are sealed.
NPT pipe is tapered. As a result the more you tighten the joints the better the seal. Using too many layers of tape only gets in the way of the seal and reduces its effectiveness.
There is a possibility for a leak path between each and every layer of tape. If you could be sure that you could put on exactly one layer tape that would be ideal, but that is generally not considered possible. As a result using the standard of two to three wraps helps ensure that you get good coverage and guarantees that there is at least one layer of teflon over the entire surface of the thread, but not so many that the possibility of leaks between layers will occur.
15 years ago
Source:
|