I know That teflon tape is not used in fuel oil heating system lines
because the fuel dissolves teflon tape.
Bill Bina
On 6/23/2015 12:38 AM, Russ & Melody via CnC-List wrote:
Hi Josh,
Good point made regarding tapered thread sealing qualities and the
lube aids to obtaining a good mechanical seal.
I'm a little dismayed that you used Teflon tape on the exhaust
fittings. This is probably the worst application for the product
(second being any system with a pump in it). It is best used in
domestic water situations.
At about 660 degrees F Teflon tape decomposes and emits a toxic fume.
Fatal to birds in the home when the frying pan gets too hot and
probably not good for humans in a small space either.
I whole heartedly support the use of high temp anti-seize. It might
stink a wee bit on the first couple of runs but it probably won't harm
you.
Cheers, Russ
/Sweet /35 mk-1
At 04:08 AM 22/06/2015, you wrote:
Most if not all pipe dopes and Teflon tape sealers are not really
there to "seal" the threads of a NPT fitting from leaking. They are
simply there to lubricate the threads so a sufficiently tight
connection can be made. The lubricant may also help in
disassembly. By design the mechanical compression as a result of
the tapered threads is what is actually supposed to prevents leaks.Â
Yes, you can use all manner of sealants which may "help" but a proper
NPT connection shouldn't need it.Â
That being said, I used Teflon tape on my exhaust (3GM35F). Just 2
wraps. I may have difficulty getting the joint apart, who knows.Â
I also used a bench vice to provide enough counter-torque.
As a suggestion I would give high temp anti-seaze a try. It is
usually copper colored and most auto parts stores should carry it.Â
If you've ever replaced an O2 sensor they include a small tube.
Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
_______________________________________________
Email address:
CnC-List@cnc-list.com
To change your list preferences, including unsubscribing -- go to the bottom of
page at:
http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
