Pipe Dope
- Thread starter whejdak
- Start date
stonesfan68
Well-known member
It will be fine. Rector Seal No. 5 is good for gases up to 2600 PSI.
RectorSeal No. 5
RectorSeal T + 2 will work for compressed air as well.
RectorSeal No. 5
RectorSeal T + 2 will work for compressed air as well.
leadsled
Member
I like loctite 567
Spareparts
Well-known member
I don't use tape of any kind on air or hydraulic lines, someone will over apply tape and small pieces
always get into valves, especially pilot controlled valves.
always get into valves, especially pilot controlled valves.
msharley
Well-known member
Yes.
For screw pipe connections it will be fine.
Pipe Dope is a lubricant...allowing the tapered threads to "mate".
Firebrick43
Well-known member
Rector seal number 5 and loctite 567 are pretty damn good.
Loctite 545 is the bomb for air and hydraulic lines.
Loctite 545 is the bomb for air and hydraulic lines.
The correct way for those tape is don’t wrap it on the first thread
nadogail
Well-known member
When possible I avoid tape and reach for liquid or paste pipe dope.
Doozer75
Well-known member
Doozer75
Well-known member
Monza Harry
Well-known member
I do not like the tape and dope approach at all. The proper dope is the answer. The 545, 567, and 590 are all pretty good but for stubborn leaks I use Loctite 577. I took a quick look at the "Henkel" site and without opening the MSDS's I didn't see the upper temp rating for any of these, and with compressor discharge temperatures of 300°+ possible that should be checked before making your final choice.
At 1 shop I worked at we were to use "RTV silicone" on pipe fittings as re-tapping the hardened parts at that time was problematic at best [deformed slightly due to heat treat] now that is considered pretty hack for sure but it did work], however changing your mind about sealant was equally problematic! RTV is also pushing the temperature limits as well. Edit: 650° should be enough. Harry
www.henkel-adhesives.com
www.permatex.com
At 1 shop I worked at we were to use "RTV silicone" on pipe fittings as re-tapping the hardened parts at that time was problematic at best [deformed slightly due to heat treat] now that is considered pretty hack for sure but it did work], however changing your mind about sealant was equally problematic! RTV is also pushing the temperature limits as well. Edit: 650° should be enough. Harry
LOCTITE® 577
Medium-strength, general purpose thread sealant for straight/straight and straight/taper threads and fittings. Fills the space between threaded parts and seals and locks at the same time.
www.henkel-adhesives.com
Permatex® Ultra Red® RTV Silicone Gasket Maker, 3 OZ - Permatex
www.permatex.com
ALinCarolina
Well-known member
Few years ago I called Rectorseal and asked whether #5 or Teflon would be indicated for compressed air and the CSR said either would be fine.
RAYJAY
Well-known member
use the sane myself
metalmagpie
Well-known member
Gasoila
RAYJAY
Well-known member
also blue block sealent
Doozer75
Well-known member
The only reliable method I have found for sealing
3/8" NPT 10,000 psi hydraulic fittings,
is to apply Loctite 567 or 577 to the male fitting
and wrap over the Loctite with thick teflon tape
at least 4 turns. Yes your fingers will get full of
the sealant, but prepared correctly, this will seal
10,000 psi oil, and will not extrude from the threads.
I believe Loctite PST is the same stuff.
-Doozer
3/8" NPT 10,000 psi hydraulic fittings,
is to apply Loctite 567 or 577 to the male fitting
and wrap over the Loctite with thick teflon tape
at least 4 turns. Yes your fingers will get full of
the sealant, but prepared correctly, this will seal
10,000 psi oil, and will not extrude from the threads.
I believe Loctite PST is the same stuff.
-Doozer
housewolf
Well-known member
Rectorseal #5 has been my go to for a lot of years. If you have a leaking threaded joint, it isn’t likely because you used the wrong pipe dope. If you have a problematic joint that will not hold, like annealed copper threads, Expando will do the trick.
There is dope available for O2 piping
There is dope available for O2 piping
metalmagpie
Well-known member
If you mix red lead powder (litharge) and glycerine in the correct ratio and apply it to threads, the compound will dry hard as stone. This is old school and cannot be unthreaded without heat, but it will never leak.