Wouldn't you want the valve as close to the wet riser inside anyway?
If you buried steel (I'd use ductile) wouldn't you use galvy 40 anyway?
Now you have no freezing issues assuming it doesn't drop underground.
Tom
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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