The "Hole" question has two parts.
1: Is there a "Seismic" requirement?
2: If there is no seismic requirement, is there some other requirement by
"Spec." or local code?
If the answer to question (1) is yes, the 8" sleeve or core is an
appropriate alternative to Flex couplings.
If the answer to (1) is "NO!" but (2) is yes, then meet the requirements as
stated in the requirement. (Size of core {If allowed} or sleeve should be
spelled out, if not you only need a "Hole" large enough for the pipe to fit
thru.
If the answer to both (1) and (2) is no, then no sleeve or core is required.
I've seen many contractors just chop a hole in a block wall with a hammer,
and patch it back around their pipe with Sakrete. (I'm not recommending
that, but it happens and is "legal".)
Just some thoughts on sleeve's in general, and that should include core
drilled hole's as well.
Sleeve's / core's serve many purposes, but some of the original reasons they
became part of the "Standard Practice" for all mechanical trades was that
they provide for differential expansion, settling of structures, seismic
relief, vibration transmission, and ease of repair/replacement.
Think of steam lines that expand and contract, passing thru walls. If they
are "cemented" in place, the wall either will move, the pipe will deflect,
or the joint between the two will fail. All of these can have bad
consequences. Steam is probably the most severe example, but the same thing
occurs with most mechanical systems. HW, CW, Condensate, steam,
refrigeration and yes to a lesser extent FP.
Nice 95'F day, you fill a FP system with 55'F water. Pipe contracts. Since
you're not doing anything to keep the water at 55'F as it equalizes with the
ambient temp. it expands. Same thing happens with ambient temp. change for
the seasons. A warehouse may be 100'F at the roof in the summer, but only
maintained at 50'F in winter. So even our "Static" system "MOVES" with
Temperature. It can transmit vibration. And it's much easier, and less
costly to replace a pipe section passing thru a sleeve/core than one
"cemented" in place.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dewayne
Martinez
Sent: Monday, July 11, 2011 4:53 AM
To: [email protected]
Subject: RE: Pipe Sleeves
I know I am late on this one but I have to know. My fitters commonly
core a 6in hole in the stair landing for 4in pipe when running
standpipes. It looks like we should be coring a 8in hole per 9.3.4.2.
Am I reading this correct?
Thanks,
Dewayne
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