On Oct 23, 6:21*pm, "HeyBub" wrote:
DD_BobK wrote:
On Oct 23, 5:01 am, "HeyBub" wrote:
Evan wrote:
On Oct 22, 11:05 pm, J Burns wrote:
The other day I bought a 1-oz tube of Harvey's Faucet and Valve
Grease. It's little like vaseline but stickier and more viscous.
The tube
says it resists high temperatures.

I can imagine several plumbing applications for it. Has anyone used
grease instead of teflon tape?

@J Burns:

In what application ?

Using teflon tape on threaded pipe fittings to provide an extra
level of
sealant in the threads is the primary application of teflon tape...

In some applications like gas piping, pipe dope is required in place
of using teflon tape...

The avowed purpose of Teflon tape is to make threading the pipe
easier by providing a slippery surface. It is the deformation of the
threads that provides the sealing of the joint.

Teflon tape does provide SOME sealing, but can't be counted on to
provide a complete one. If it did, pipe dope would not be required
for certain application.

Hey Bub-

Why do you insist on spreading this wrong information?

"avowed purpose of Teflon tape is to make threading the pipe easier
by providing a slippery surface. It is the deformation of the threads
that
provides the sealing of the joint."

In several previous A.H.R threads it was clearly established
that........
NPT threads DO NOT SEAL BY THREAD DEFORMATION.

The design & mfr of the threads create a spiral leak path between the
thread crests and valleys.
NPT threads, correctly cut, MUST HAVE A SEALANT TO NOT LEAK.

Only NPTF threads (dry seal) depend on thread deformation to seal.

I am amazed by your inability to absorb new information to replace
wrong information.

Sigh.

"The use of [Teflon] tape in tapered pipe threads performs a lubricating
function, which more easily allows the threads to be screwed together, to
the point of deformation, which is what creates the seal." Wikipedia.

"For NPT threads a sealant compound or Teflon tape must be used for a
leak-free seal. For NPTF no sealant is needed for a sealing." ANSI/ASME
B1.20.1


And what is your point?

"The use of [Teflon] tape in tapered pipe threads performs a
lubricating
function, which more easily allows the threads to be screwed together,
to
the point of deformation, which is what creates the seal." Wikipedia.

The Wikipedia "entry" that you quote:

"The use of [Teflon] tape in tapered pipe threads performs a
lubricating
function, which more easily allows the threads to be screwed together,
to
the point of deformation, which is what creates the seal."

is wrong..........

as it relates to NPT threads ("normal" pipe threads).
NPT threads are probably the only type encountered by readers of this
newsgroup.

The frequency of use of NPTF pipe threads is vanishing small.....
this being a residential newsgroup most readers will seldom, if ever,
encounter them.

NPTF thread are typically used in systems where tape & dope are
prohibited. typically hydraulic systems with close clearance
"servo" valves.


This quote

"For NPT threads a sealant compound or Teflon tape must be used for a
leak-free seal. For NPTF no sealant is needed for a sealing."
ANSI/ASME B1.20.1

is correct.

And will notice there is no mention of lubrication.

cheers
Bob