DIYbanter - View Single Post - Question just about the order of pipe dope sealant and teflon tape

dpb

On 5/11/2013 7:49 PM, wrote:
On Sat, 11 May 2013 10:22:27 -0700 (PDT), Harry
wrote:
....

I saw no place that says "no chedule 80". It says DO NOT MIX 40 and
80 schedule.
....

Well, that's not QUITE what it says...it says Sch 80 isn't be needed on
Sch 40 properly installed...Sch 80 is overkill but can't really hurt
anything.

So with Sched 40 pipe, no Sched 80 fittings.right??

Can't hurt unless again they're severely over-torqued...

What it's really trying to say is that Sch 40 fittings
_properly_installed_ are all that a Sch 40 system needs to meet the
pressure requirements that Sch 40 is rated to hold. (Which, of course,
only makes sense else't a component would be underdesigned in comparison
with the rest of the same components.)

What they're driving at is as the other responder said above is that the
correct solution to splitting Sch 40 fittings isn't to go to Sch 60 or
Sch 80 and get by w/ over-tightening them but to install Sch 40
correctly instead.

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