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8. MAINTENANCE
The NX seal cooler may only be disconnected by qualified personnel, in accordance
with national regulations, the safety standards of the user and in accordance with the
users operating procedures.
Before disconnecting the equipment, verify that:
• The equipment is at ambient temperature
• The equipment is not pressurized
• The equipment is drained
Process fluid may remain in tubes, Removal of remaining fluid to adhere to site policy.
WARNING
DANGER CHEMICALS:
Dangerous chemical might be released during
removal of the system. Wear Personal Protective Equipment (PPE).
Follow all safety regulations and Plant regulations.
8.1 Remove the seal cooler from service.
8.2 Remove all end fittings connected to the lengths of tubing protruding from the
top of the cooler. Fitting ferrules and nuts cannot be removed from the primary
lengths of protruding coil and should be remain in place. Do not remove the fit-
tings directly adjacent to the top end plate. Be sure to retain all fittings and mark
them appropriately. This will minimize the likelihood of fitting leaks upon reas-
sembly.
8.3 Remove the center bolt.
8.4 Carefully pry each end plate from the main cooler body. A 5/16” eye bolt can be
inserted into each end plate to offer an adequate amount of leverage. Take care
not to use too much force, which can result in coil stretch. The outer and inner
cases can now be removed, which will expose the coiled tubing.
8.5 Clean the case and coils taking care not to damage either.
8.6 Inspect all components for damage or corrosion and replace as needed. Second-
ary sealing components such as O-rings should always be replaced.
8.7 Reassemble the unit in reverse of disassembly. Center bolt torque required is
110 lbf-ft (149 N-m) for 3/4" bolt and 250 lbf-ft (338 N-m) for 1” bolt. All fittings
should be reassembled to the manufacturer’s specifications.
