10 | INSTALLATION, OPERATION and MAINTENANCE MANUAL
b. When the cleaning cycle is controlled from a remote or automated control
center, establish fail safe procedures to avoid automatic startup while servicing
equipment in the circuit.
c. On heat exchangers that include safety screens, ensure the screens are
correctly installed prior to starting the cleaning cycle (see Section 13.3).
3.8. List of Safety Precautions
a. The welded and gasketed chambers of an APV welded plate pair may have
different pressure and fluid capabilities. Ensure the fluids are connected
correctly. (See page 24)
b. The lifting equipment must be in good condition and used in full compliance with
the manufacturer’s specifications and limitations. (See page 40)
c. Never exceed 120° between the lifting wires at any time. (See page 40)
d. If the ceiling height does not allow for a safe lifting angle, dollies or creepers
can be used to move the equipment. (See page 41)
e. Always observe correct procedures for lifting and/or moving equipment.
Qualified personnel should perform the lifting and moving. Personnel must
follow prescribed rigging practices. (See page 41)
f. Do not use a forklift truck to lift a heat exchanger unless it is securely mounted
to a pallet or skid. (See page 41)
g. Startup and shutdown of the heat exchanger must be undertaken slowly and
smoothly. This is to avoid any pressure shocks or water hammering, which can
damage the equipment or cause leakage. Pressure changes must occur
gradually, at a maximum rate of 1.7 bar (25 psi) every 10 seconds. Similarly,
temperature changes must be gradual and limited to less than 10
o
C (18
o
F) per
minute. Operators should monitor and record pressure and temperature
changes in at least the mentioned intervals. (See page 50)
h. Exceeding the design temperatures and pressures can be harmful to the
equipment and personnel and must be avoided. (See page 54)
i. Sudden changes in the operating pressures and temperatures must be avoided.
Shock cooling of the APV GPHE may cause leakage, due to sudden contraction
of the sealing gaskets. (See page 55)
j. Temperature and pressure cycling must be limited to the rate changes specified
in Section 11-1 (startup and shutdown). (See page 55)
k. Never open a pressurized GPHE. (See page 55)
l. Always wear protective gloves and cut-resistant sleeves when handling plates
or any other objects with sharp edges (nuts, tie bars, safety screens, etc.). (See
page 56)
To Next Page
Loading...