Algas SDI Direct Fired F6-ASME, Руководство по эксплуатации и техническому обслуживанию

Страница: 28 / 52

Maintenance
Algas-SDI Operation and Maintenance Manual – P/N – 54000 17
a wire brush may be used for removal. A large amount of build-
up on the outside of the heat exchanger can lead to a reduced
capacity from your vaporizer.
3. Check bottom head of the heat exchanger for pitting and/or
scaling. Should heat exchanger head thickness be less than
0.156” (5/32”) the heat exchanger should be removed from
service. Nominal wall thickness 0.250” (¼”). An Ultrasonic
thickness tester can be used to determine wall thickness.
4. Check heat exchanger for heavy ends accumulation inside the
vessel. Remove the liquid inlet valve and tilt the vaporizer on its
side to drain the heavy ends. Re-install liquid inlet valve and
uniformly torque bolts to 30-35 ft.-lbs using a star/cross pattern.
NOTE: In areas where LPG quality is poor it may be necessary for heat
exchangers to be checked for heavy ends more frequently (monthly or bi-
monthly depending on quality of LPG). Once it is verified that no
significant quantity of heavy ends are accumulating during vaporizer
operation, this maintenance can be performed on an annual basis.
Drip Leg Remove plug below the “T” on the drip leg and drain the drip leg to
prevent it from filling with contaminants and passing them into the
thermostat. NOTE: In areas where LPG quality is poor it may be
necessary for drip legs to be checked for heavy ends more frequently
(monthly or bi-monthly depending on quality of LPG). Once it is verified
that no significant quantity of heavy ends are accumulating during
vaporizer operation, this maintenance can be performed on an annual
basis.
Vaporizer Cabinet Inspect the door, inside enclosure, inlet louvers and vent caps for debris
and/or combustible material. If needed, clean areas so they are free of all
debris.
CAUTION
3. When servicing a component in the liquid or vapor line, BE
SURE that the LP-gas supply is shut off to that component
before it is removed or disassembled. The vaporizer must be
completely purged before performing service. Be sure that ALL
sources of ignition are extinguished within 25 feet of the work
area.
4. When flaring the contents of the vaporizer, be sure that the
burners are on to prevent freezing during the flaring operation.