Primer and Cement pump to pvc?

[Kinetic]

I have a PanWorld 200ps and it has a threaded 1" input. The previous owner looked to have used teflon tape to attach some pvc to it. The output seems to be glued on. I have a union ballhead attached to the pipe that goes into the pump, should I take this segment and cement it to the pump? Or should I simply use teflon?

 

[MorandiWine]

I would never solvent weld or glue anything to a pump or a thing that you will need to service!! Always use teflon to seal it and always use teflon on threaded fittings.

Have fun

tyler

 

[Blu50Stang]

Re: Primer and Cement pump to pvc?

<a href=showthread.php?s=&postid=7701966#post7701966 target=_blank>Originally posted</a> by Kinetic
The previous owner looked to have used teflon tape to attach some pvc to it. The output seems to be glued on.

So it's teflon taped AND glued


I agree with the previous post. It's best to just use teflon tape on a pump's output. I always use a valve and union(or 2 if it's a closed loop pump) so that I can easily isolate, remove and service the pump.

 

[Kinetic]

Will it be more suseptable to leaking / microbubbles with just teflon? Everything else is cemented.

Is the general rule to teflon all threaded pieces and cement all slip pieces? Such as threaded bulkheads etc?

 

[Freed]

If you wrap at least 3or4 times with teflon you should be fine. Slip fittings usually get glued but depends on the situation.

 

[Mr. Ugly]

<a href=showthread.php?s=&postid=7703542#post7703542 target=_blank>Originally posted</a> by Kinetic
Is the general rule to teflon all threaded pieces and cement all slip pieces?

Yep, that's how it's intended to be done. More than just a general rule

Oh, and no need to teflon straight threads on union nuts, only on tapered pipe threads.

 

[Kinetic]

ah, I tefloned my unions too =P can't hurt right?

 

[Freed]

Won't hurt but not necessary because of the o-ring inside the union itself.

 

[Mr. Ugly]

You gotta watch out with teflon. More is not better. I've seen elbows and other fittings split over time from the pressure of excess teflon. This can happen months later.

There were at least two cases in our research labs where contractor installed PVC piping failed and flooded due to this.

You probably won't split a union though. But if it were me, I'd remove it, just because it isn't correct to use teflon there

 

[GreshamH]

Spears has a PDF on their site about teflon and how most people use WAY too much. Typical wrap is like twice as much as needed. 3 - 4 wraps, like Norman said

 

[Sparkss]

I have seen too much teflon split a bulkhead. As has bene said, more is definitely not better. And I would never glue a thread, espeically not to a pump housing.

 

[Kinetic]

cool! thanks guys!

I've also upgraded all my bulkheads to sched 80, just to be safe =X

 

[Vincerama2]

An alternative is to use plumbers joint compound, which is basically a teflon paste. But be warned that it can get messy.

V