why?? NFPA code didin't specify any requirement to FLUSH internal Sprinkler piping inside the Building.
NFPA - 13 (16.6), says to have a provision of flushing system.
You could also have a look at FM to have a flushing system on it.
in NFPA 13,under System Acceptance its required to flush only underground piping and Lead in connection.
also reference above needs only flushing provision but doesn't require internal piping flushing before putting in work
Enclosing NFPA - 13, 2019 edition to have a reference.
Also, FM global data sheet recommendations (220.127.116.11) on this, shall give the flushing installation guidelines to have a way forward.
Flushing is recommended for internal piping and fittings, before it is in system.
as our sprinkler system is not grid and as NFPA hasn't made it mandatory to flush internal sprinkler piping my contractor want to install sprinkler and flushing valves without flushing.
NFPA 13 requires the flushing of underground for three reasons:
1) It is typically installed by non-fire protection contractors and they are not as careful about making sure the piping stays clear of obstructions during installation. When the sprinkler contractor takes over the job (typically at the floor flange) it is important to make sure that the underground is clear because if something gets pushed from the underground into the above ground pipe, it becomes the sprinkler contractor's problem. So, it is best to make sure that the underground is clear.
2) With the underground pipe so close to the ground, it's easy for stuff to get into it. People, nature and wildlife both are capable of causing obstructive material to get into the pipe.
3) We know that stuff frequently gets in. Rocks, dirt, lunch boxes, lumber, and animals (dead and alive) have all been flushed out of underground. Since it happens so often that we find stuff in the pipe, we make sure to require the underground to be flushed.
The above ground pipe does not have as many of these problems. Once it's installed up in the air, it's hard for any person or animal to get stuff into it. I suppose that a bird could deposit stuff in the pipe once it's up there, but I've never heard of it.
When the pipe is on the ground, the sprinkler contractor is aware that they are responsible and are careful in how they treat it in that location. When the fitter picks up the pipe to install it in the air, they make sure that it is clear of obstructions.
For all of these reasons, there has never been a demonstrated need to require that every sprinkler system be flushed. Remember that we have been installing sprinkler systems for over 100 years with NFPA 13 and there has never been a rash of sprinkler systems installed with obstructions. Note that there are requirements for retrieving the pieces of the pipe that are cut out during the installation to make sure they are not trapped in the pipe.
Finally, remember that NFPA 13 is a "minimum" set of requirements. These are the rules that if you don't follow them as a bare minimum, you are negligent. But NFPA 13 does not prohibit flush testing. If you have knowledge of a problem or think that obstructions might have occurred, you have a responsibility to flush that particular system even if NFPA 13 does not require it.
thansk a lot
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