Contractor shall furnish instruments, equipment, and personnel
required for the tests; the Government will furnish the necessary
water and electricity.
k.
Operational test and verification of purity of medical gas
systems. Each outlet shall be tested and installation certified as
to correctness of installation. The tests shall be performed by
an independent testing company and a certification document
provided stating that the entire medical gas system, for each
individual gas, has been tested, found correctly installed, and
the purity of the delivered gas has been verified.
3.22.9
Disinfection
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NOTE: The option of having the Contracting Officer
perform the sampling and testing shall be selected
only if Government laboratory facilities are
available and with concurrence from appropriate
laboratory personnel. At some locations, either
disinfection or installation health officers
inspsect the disinfection process. If this is
required, add a notification requirement and give
the office to notified including phone number. For
modification of existing systems, provide specific
procedures for disinfection of equipment
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After operational tests are complete, the entire domestic hot-and-cold
water distribution system to be disinfected shall be flushed as specified,
before introducing chlorinating material. The chlorinating material shall
be either liquid chlorine or hypochlorite. Except as herein specified,
water chlorination procedure shall be in accordance with AWWA C651 and AWWA
C652. The chlorinating material shall be constantly fed into the water
piping system at a concentration of at least 50 parts per million (ppm). A
properly adjusted hypochlorite solution injected into the main with a
hypochlorinator, or liquid chlorine injected into the main through a
solution-feed chlorinator and booster pump, shall be used. The chlorine
residual shall be checked at intervals to ensure that the proper level is
maintained. Chlorine application shall continue until the entire main is
filled. The water shall remain in the system for a minimum of 24 hours.
Each valve in the system being disinfected shall be opened and closed
several times during the contact period to ensure its proper disinfection.
Following the 24 hour period, no less than 25 ppm chlorine residual shall
remain in the system. Water tanks shall be disinfected by the addition of
chlorine directly to the filling water. Following a 6 hour period, no less
than 50 ppm chlorine residual shall remain in the tank. If after the 24
hour and 6 hour holding periods, the residual solution contains less than
25 ppm and 50 ppm chlorine respectively, flush the piping and tank with
potable water, and repeat the above procedures until the required residual
chlorine levels are satisfied.The system, including the tanks, shall then
be flushed with clean water until the residual chlorine level is reduced to
less than 1 ppm. During the flushing period each valve and faucet shall be
opened and closed several times. Samples of water in disinfected
containers shall be obtained from several locations selected by the
Contracting Officer. The samples of water shall be tested for total
coliform organisms (coliform bacteria, fecal coliform, streptococcal, and
other bacteria) in accordance with AWWA EWW. The testing method used shall
be either the multiple-tube fermentation technique or the membrane-filter
SECTION 15405A
Page 108
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