126.96.36.199 Condenser Cleaning. All piping systems with lines to the condenser should be
completed and the lines to the condenser flushed with service water. Lines not having
spray pipes in the condenser may be flushed into the condenser. Those with spray pipes
should be flushed before making the connection to the condenser. Clean the interior of
the condenser and hot well by vacuuming and by washing with an alkaline solution and
flushing with hot water. Remove all debris. Open the condensate pump suction strainer
drain valves and flush the pump suction piping. Prevent flush water from entering the
pumps. Clean the pump suction strainers.
188.8.131.52 Condensate System Chemical Cleaning. Systems to be acid and alkaline cleaned
are the condensate piping from condensate pump to deaerator discharge, boiler feedwater
piping from deaerator to economizer inlet, feedwater heater tube sides, air preheat
system piping, and chemical cleaning pump suction and discharge piping. Systems to be
alkaline cleaned only, are the feedwater heater shell sides, building heating heat
exchanger shell sides, and the feedwater heater drain piping. The chemicals and
concentrations for alkaline cleaning are 1000 mg/L disodium phosphate, 2,000 mg/L
trisodium phosphate, non-foaming wetting agent as required, and foam inhibitors as
required. The chemicals and concentrations for acid cleaning are 2.0 percent
hydroxyacetic acid, 1.0 percent formic acid, 0.25 percent ammonium bifluoride, and
foaming inhibitors and wetting agents as required.
a) Deaerator Cleaning. Prior to installing the trays in the deaerator and
as close to unit start-up as is feasible, the interior surfaces of the deaerator and
deaerator storage tank shall be thoroughly cleaned to remove all preservative coatings
and debris. Cleaning shall be accomplished by washing with an alkaline service water
solution and flushing with hot service water. The final rinse shall be with
demineralized water. After cleaning and rinsing, the deaerator and deaerator storage
tank shall be protected from corrosion by filling with treated demineralized water.
b) Cycle Makeup and Storage System. The cycle makeup and storage system,
condensate storage tank, and demineralized water storage tank shall be flushed and
rinsed with service water. The water storage tanks should require only a general hose
washing. The makeup water system should be flushed until the flush water is clear.
After the service water flush, the cycle makeup and storage system shall be flushed with
demineralized water until the flushing water has a clarity equal to that from the
c) Condensate-Feedwater and Air Preheat Systems. The condensate-feedwater
and air preheat systems (if any) shall be flushed with service water. The condensate
pumps shall be used for the service water flushing operations. Normal water level in
the condenser should be maintained during the service water flushing operation by making
up through the temporary service water fill line. After the service water flush, the
condensate-feedwater and air preheat systems shall be flushed with demineralized water.