90 year old system, 250 ft long building. Have to remove about 1/2 of
branch lines and re-do riser nipples and cut riser to pitch main.
Messing with an old system can be a recipe for disaster. If you did
one for every pipe size, this would require 8-10 drum drips, which
could be made up in the shop and connected to the main with
mechanical tees. Sounds a whole lot easier and cheaper to me. This
owner has a good track records maintaining systems.
At 02:17 PM 8/27/2010, you wrote:
There used to be a "Manifold drain" allowed for very small DP systems with
like 1" branch lines. I think that now it's called "Tie-in Drains"
8.16.2.5.3.5 anyway it's still for trapped branch lines. If the drains, One
for each pipe section of main are not "Too Much Money" why would
"Re-hanging" the main be too much? I'd rather re-hang 40 pieces of main than
pipe 40 drum drips to it and then have to rely on the owner to service them
"As Required"
T.
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860.535.2080
www.fpdc.com
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