It sounds like someone is confusing the domestic water system with the fire
service.  Typically, the domestic water piping shall be desinfected by a
method such as written in your email.  You might want to get clarification
from the engineer if they mean to have this process happen also on the fire
service piping and where it's written in the code that it needs to be done
this way..

2008/8/15 RFI - Bismarck [EMAIL PROTECTED]

>
>
> …Upon completion of the sprinkler installation, the system shall be
> sterilized with an approved chlorinating material before system is placed
> in
> operation.  The amount of chlorine applied shall be such as to provide a
> dosage of not less than 50 ppm.  The chlorinating materials shall be
> introduced into the water supply lines and sprinkler systems in a manner
> accepted by the engineer.  Following a contact period of not less than 8
> hours, the chlorinated water shall be flushed from the system with clean
> water until the residual chlorine is not greater than 0.4 ppm.  All valves
> in water lines being sterilized shall be open and closed several times
> during the 8-hour period.
>
>
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