Some issues to review;
Where is the Cl injection point?
What % or parts per million will the Cl be maintained?
Will system be batch injection or metered as new water enters sprinkler
system via jockey pump?
How will % injection Cl be maintained and monitored so as not to harm
the sprinkler system piping or the fire pump and related controls.
In what form will the Cl be stored in?
Depending on form of storage could bring some serious environmental
concerns for the Owner.
How will Cl system affect sprinkler system maintenance?
We had a stainless steel piping system that some engineer thought it would be
faster to super-chlorinate the piping instead of steam sterilization of the
piping system. We received a call from one of the plant senor managers about
helping with "rust" in the stainless steel piping system's effluent from the
sterilization process. A little latter we found that a weld on a flange was
eaten away by the "rust". We sent samples of the "rust" to a biologist. The
analysis indicated the "rust" was a bacteria colony made up of bacteria that
were chlorine breathing and carbon eating. When the pipe system was
super-chlorinated the bacteria was actually being supplied with a solution
which speed up the bacteria's ability to eat the carbon out of the molecular
structure of the pipe.
You need to get someone who works with chlorine injection systems on a daily
basis to determine if the sprinkler system can be adversely influence.
Regards
Jim Davidson
Davidson Associates
Fire Protection * Medical Gas * Code Consulting
302-994-9500 Fax:302-234-1781
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ed Cyr
Sent: Monday, July 18, 2011 4:31 PM
To: American Fire Sprinkler Association
Subject: Pond Water - Chlorine Injection into underground fire line
The water source for this wet pipe sprinkler system comes from a membrane
lined pond.
Filtration screens will be at the fire line intake at the pond.
The civil engineer is requesting that a chlorine injection system be
installed in the suction line from the pond to the fire pump.
The reason stated for this is to keep the algae at bay.
I explained that the system will become anoxic over time because of the
static nature of the system.
My question - Is this required or even necessary? I find no reference in
NFPA or FM literature.
Will chlorine have an effect on system piping, fittings or sprinklers over
an extended period.
Any feedback would be appreciated.
Thanks,
Ed Cyr
Alpha Fire Sprinkler Corp.
San Luis Obispo, CA
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