Install Instructions

Operation
Brazed Plate Heat Exchangers Installation, Operation, and Maintenance Manual 9
WARNING:
A heat exchanger is a pressure vessel designed for operation at certain
specific limits of pressure and temperature. The cooling or process system,
which includes the heat exchanger, must be safeguarded with safety valves
and controls so that these heat exchanger design conditions are not
exceeded. All operating personnel should be made aware of these specific
design pressures and temperatures prior to start-up.
1. Insure the entire system is clean prior to start-up to prevent plugging of passages with debris. The
use of strainers or settling tanks in pipelines leading to the heat exchanger is recommended. The
recommended strainer size is 20-24 mesh.
2. Start operating gradually. See Table 6 for suggested start-up and shut-down procedures for most
applications. If in doubt, consult the nearest Xylem Heat Transfer representative for specific
instructions.
3. Do not operate the heat exchanger under pressure and/or temperature conditions in excess of the
specified design limits shown on the nameplate attached to the heat exchanger.
4. Drain all fluids when shutting down to eliminate possible freeze-up and/or corrosion issues.
Type of
Fluid
Relative
Temperature
Type of
Fluid
Relative
Temperature
Start-Up
Procedure
Shut-Down
Procedure
Liquid Hot Liquid Cold
Start both fluids
gradually at the
same time.
Shut down both
fluids gradually at
the same time.
Gas Hot Liquid Cold
Start cold fluid first
then hot fluid.
Shut down hot fluid
gradually then cold
fluid.
Condensing
Gas
Hot Liquid Cold
Start hot fluid first
then slowly start
cold fluid. Avoid
temperature
shock.
Shut down cold
fluid first then hot
fluid.
Liquid or
Gas
Hot
Vaporizing
Liquid
Cold
Start hot fluid first
then cold fluid.
Shut down cold
fluid first then hot
fluid.
TABLE 6