Quincy QSF Series Instruction Manual page 51

Addendum 1 - Shell and Tube Heat Exchanger Installation and Service Recommendations
Recommendations:
Replace gaskets when removing end castings. It is recommended that gaskets be soaked in oil to prevent
corrosion and ensure a tight seal.
Salt water should not be used in standard models. Use salt water in special models having 90/10 copper-nickel
tubes, tube sheets*, bronze bonnets and zinc anodes on the tube side. Brackish water or other corrosive fluids
may require special materials of construction.
When zinc anodes are used for a particular application, they should be inspected two weeks after initial startup.
At this time, by visual inspection of the anode, determination of future inspection intervals can be made based
on the actual corrosion rate of the zinc metal.
The zinc anodes must be replaced when 70% of the zinc volume has been consumed.
It may be necessary to drain the water chambers of the exchanger to protect it from damage by freezing
temperatures. Drains are provided in most standard models.
The oil chamber of the exchanger may become filled with sludge accumulation and require cleaning. It is
recommended that the unit be flooded with a commercial solvent and left to soak for one-half hour. Back
flowing with the solvent or regular oil will remove most sludge. Repeated soaking and back flowing may be
required, depending on the degree of sludge build-up.
It may be necessary to clean the inside of the cooling tubes to remove any contamination and/or scale build up.
It is recommended that a fifty-fifty percent solution of inhibited muriatic acid and water may be used. For severe
problems, the use of a brush through the tubes may be of some help. Be sure to use a soft bristled brush to
prevent scouring the tube surface causing accelerated corrosion. Upon completion of cleaning, be certain that
all chemicals are removed from the shell side and the tube side before the heat exchanger is placed into service.
Added 09/2010
Quincy Compressor – QSF Series
47