2007 NFPA 13 design
75 ft FDC pipe lay
the advantages I see to placing the check valve as
close as possible to the riser (and above ground
in the riser room) are:
1. it is easier to maintain the valve.
2. you can see leaks that are at the valve.
3. don´t necessarily have to bury the upstream
pipe below the frost line
disadvantages
1. need galvanized pipe for the dry section
2. need to dig a rock sump to accept drainage
of the ball-drip valve (not a big problem)
3. probably faster corrosion of dry pipe than with
wet pipe underground vaulted check-valve arrangement.
Corrosion of the pipe is a big reason to go with an
underground vault check valve. Any more good reasons?
However, I am leaning toward placing the FDC check valve
above ground in the riser room, because shallow digging
effects this job. We have 2 feet of soil over hard, bedrock.
scot deal
excelsior fire
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