Leslie Controls NYC Heat Exchanger - Manual (Page 13)

Page 13 of 25
rain). During transportation, ensure that they are not
exposed to mechanical damages.
STARTUP
To prepare heat exchanger for operation, it should initially
be:
Mounted properly
Filled with working fluids
Deaerated
All connections checked for leaks
During startup, first open valves, then start pump of
heated medium followed by opening cycle of heating
medium. Valves should be opened gradually in order to
achieve a steady increase in flow and pressure. Pressure
increase/decrease should not exceed 72 psi/min (0.5
Mpa/min).
Figure 11 - Complete Installation Diagram
Figure 12 - Insulation tied with straps
Insulation is mainly used to reduce heat loss, and also
offers operator some degree of personal protection from
hot surface of unit. Insulation should be designed for
temperatures up to 130°C.
CLEANING
Heat exchangers are cleansed by flushing units with
fluids which do not react with stainless steel.
Dirt deposit in heat exchanger will result in an increase in
pressure drop, lower temperature difference in heated
medium or a higher exit temperature on heating medium
side. Flushing can be done without removal of heat
exchanger from system.
Following fluids are prohibited for use as a flushing agent:
Hydrochloric acid up to 0.1% concentration
Solutions which contain MCI
Chlorides (MgCl
2
NaCl between 0.01 – 1%, CuCl up to
1%, CaCl
2
from 5% to saturation, KCL, MgCl
2
)
Any fluid which should deposit alkaline residue or
phosphorous
Cleaning solutions are easily accessible at businesses
carrying chemical cleaning agents for heat exchangers or
tubing and piping applications. As a guideline to
purchasing cleaning solutions, check for following
products data:
- Compatibility with stainless steel