This is similar to what they are doing at Bomgaars in Central City.
Installing a 6:" off of a 4"
Thanks
Roger
----- Original Message -----
From: "George Church" <[email protected]>
To: <[email protected]>
Sent: Thursday, November 11, 2010 8:09 AM
Subject: RE: reduce then increase pipe sizes
We've got a project where we need 8" UG for the calcs, and the main in the
street is 6". 6x6 tap, increase to 8, we're on our way. The water purveyor
is not going to replace a block or two of existing UG.
And look at 13D systems- certainly not unusual to have a 3/4 UG supply
increased to 1" for the sprinkler riser after the tee.
glc
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Cliff
Whitfield
Sent: Thursday, November 11, 2010 8:59 AM
To: [email protected]
Subject: RE: reduce then increase pipe sizes
Todd,
I've seen this done in the past. In fact, there are a lot of times when
it's done by the water purveyors during a tap on the main underground
line.
Not sure of a specific code reference. If common sense is an option you
can
point to NFPA 20 that allows a smaller size supply to feed a fire pump (ie
6" line feeding an 8" pump) if you go a certain number of feet (in pipe
diameters) back and increase the pipe at that point.
I believe the whole basis for hydraulic calculations is that if you can
prove it works within the boundaries set forth in the standards then it is
acceptable. You can reduce pipe sizes to balance a system when you are
working with foam. I don't think this is really any different.
Cliff
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Todd
Williams
Sent: Thursday, November 11, 2010 7:51 AM
To: [email protected]
Subject: reduce then increase pipe sizes
I am working on an existing system where we have to tie in a new 2-1/2"
main
into an existing 3". Since they do not make a 3x2-1/2 mechanical tee, that
option is out. My proposal is to utilize an existing plugged 2" outlet,
install a 2 x 0-6 TxG nipple and then increase to 2-1/2". It works
hydraulically with 18+ psi left over (reducing the 2-1/2" main not an
option
hydraulically).
I don't see anything in the Code that states that it is not allowed.
However, the AHJ says it isn't. Before I argue the point, am I missing
something?
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860.535.2080
www.fpdc.com
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