BOGE Operating instructions for C 15 series screw compressors Page 39
Optional equipment 4.1 BOGE-Duotherm BPT
Part 4: Optional equipment
4.1 BOGE-Duotherm BPT
Function
The heat recovery system BOGE-Duotherm BPT utilizes the heat energy re-
leased during compression to produce warm water free of charge (e.g. for pro-
duction systems or to supply a heater).
The plate heat exchanger is connected in the main stream of the hot oil. It com-
prises of stainless steel plates which are soldered together. These form two
separate duct systems. Compressor oil and water run through these ducts with
opposing flow directions. The hot oil transfers its heat to the colder water via
the plates.
Assembly
As a rule, the plate heat exchanger is installed into the compressor at the fac-
tory and comes equipped with all necessary pipework. Only the following work
is required during installation:
– Connect the supply and discharge water lines to the pipeline mains.
Route the pipelines to prevent transmission of stresses/tension and vibra-
tions to the heat exchanger.
– Provide venting and draining facilities.
The customer must provide the following components for installation:
– Stop valves
Stop valves in the water supply and discharge lines enable simple removal
of the heat exchanger.
– Expansion vessel and safety valve.
Separate installation
The plate heat exchanger may also be separately installed or retrofitted by the
customer.
Normally, the plate heat exchanger is held in place by the pipelines. However,
when installing larger types, the customer may have to provide a bracket.
Commissioning
Proceed as follows during commissioning:
– Check oil level in the oil circuit. If necessary, top up oil.
– Slowly open the stop valves in the water supply and discharge line.
Avoid pressure hammers!
– Vent the pipelines.
WARNING!
If the stop valves in the water supply and discharge lines are closed simulta-
neously, an enclosed space is created. If the water in this space is heated, it
expands and the pressure increases.
Therefore, an expansion vessel and safety valve must be installed to avoid
damage to the plate heat exchanger.
– Dirt trap (pore size: max. 0.02 inches)
The dirt trap at the water inlet protects the plate heat exchanger against
dirt deposits in the event of a high degree of water contamination.
– Flushing connections
The flushing connections serve to clean the plate heat exchanger.
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