pipe tape for steam boiler low water cut off

Blackmajah

I am replacing a McDonnell Miller 67 low water cut off on a steam boiler. Do you need to use teflon pipe tape on the fittings for the boiler nipples that attach to the boiler and the gauge glass tapings and nipple into the LWCO?

The old one I took off did not have anything on any of the threads of the fittings.

Thanks

Matt

gerry gill

I do..

sometimes tape and dope.

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tim smith

Teflon tape, NO

Problem with teflon tape is that it is a poor conductor of current which as a post from johnNY below shows is what you need for it to prove to ground. Just use pipe dope so you are not separating the brass to iron connection, you will have less problems with nuisance lockouts. Tim
ooops, missed that it was a #67 lwco. :0

Bruce Stevens

Go with the Teflon

or tape and dope easier to get apart later on, Tim is correct if using a probe type LWCO

Ken_40

Teflon tape..

is fine. Remember, the PRIMARY purpose of pipe dope is to act as a lubricant! This allows mating of the two threads to a depth and natural seal that is ALMOST waterproof of itself.

The SECONDARY purpose of dope is to fill those minute voids where the threads do not perfectly mate.

All dope is removed between threads that are in full engagement and male to female contact is electrically continuous in adequate numbers to assure adequate electrical pathway with absolutely no resistance to current flow for the purposes we must be concerned with.

The only exception possible might be the over application of any dope, and the under-tightening of the pipe. It is remotely possible to over-dope and under torque anything. The joint might not leak - and yet be electrically "disconnected."



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