Hydrostatic Test on addition to existing freezer
Hydrostatic Test on addition to existing freezer
(OP)
Picture an existing 20,000 sq ft industrial freezer where 30 years ago the fire sprinkler contractor did not fully sprinkler the building.
Decades later the local authority having jurisdiction requires additional sprinklers, about 60 heads, be added to this freezer and now he wants to see a hydrostatic test.
It's a standard dry system and when it has tripped in the past they simply take the pipe outside to let it thaw out.
We can't heat the building because frost under the slab will heave and most likely destroy the building. I can not see how we can do a hydro. I know, we have to destroy the building to save it with sprinklers?
Is there anywhere I can find a saving grace on this rather peculiar situation?
Decades later the local authority having jurisdiction requires additional sprinklers, about 60 heads, be added to this freezer and now he wants to see a hydrostatic test.
It's a standard dry system and when it has tripped in the past they simply take the pipe outside to let it thaw out.
We can't heat the building because frost under the slab will heave and most likely destroy the building. I can not see how we can do a hydro. I know, we have to destroy the building to save it with sprinklers?
Is there anywhere I can find a saving grace on this rather peculiar situation?





RE: Hydrostatic Test on addition to existing freezer
RE: Hydrostatic Test on addition to existing freezer
RE: Hydrostatic Test on addition to existing freezer
You could always go for the up-sell, convert it to a single-interlock pre-action and tell the owner he'll never have to worry about flooding the system again... unless there's a fire, of course.
RE: Hydrostatic Test on addition to existing freezer
And yes, the valve trips, the pipe is taken apart to thaw but what about the hydro after it is put back together again?
RE: Hydrostatic Test on addition to existing freezer
RE: Hydrostatic Test on addition to existing freezer
Does it say do the air till it warms up, or air test is good enough?
Not near the book.
Yes I saw a company try to anti freeze a deep freeze warehouse once, took a number of tries before it passed, plus a lot of anti freeze
I take it this is a freezer for food?? The one I saw had to use food grade anti freeze
RE: Hydrostatic Test on addition to existing freezer
Can they some how isolate the new stuff and only test that?
Or set down with someone and try some common sense, that kind of not testable??
Can you use this out of 25, to argue that a hydro should not be done??
13.4.5.2.2.1
Dry pipe valves protecting freezers shall be trip tested in a manner that does not introduce moisture into the piping in the freezers.
RE: Hydrostatic Test on addition to existing freezer
http://www.nfsa.org/?page=EOD
RE: Hydrostatic Test on addition to existing freezer
RE: Hydrostatic Test on addition to existing freezer
1. We have added a sectional valve to shut off the piping to the freezer. The valve was locked or monitered
2. Most of the freezers we have serviced have dry heads
3. Signs were added to remind us of the purpose of the valve, and if the system was wet, dry, an antifreeze loop, and what kind of antifreeze
RE: Hydrostatic Test on addition to existing freezer