AERCO Steam Generator - Manual (Page 12)

INSTRUCTIONS – AERCO HELITHERM STEAM GENERATOR MODEL SS1B-PLUS
SG-101-10
ROUTINE MAINTENANCE
The constant flexure of the coils under varying
load conditions automatically provides a
descaling action and prevents a buildup of brittle
scale. A periodic blow-down (draining) is
required lo remove accumulated solids.
After the first 3 months of initial operation, drain
the Generator as outlined below. Examine the
water being drained:
a. If the amount of solids appears to be
heavy, set a schedule to drain the
Generator every 3 months.
b. If the amount of solids appears to be
light, set a schedule to drain the
Generator every 6 months.
c. Even if the amount of solids appears
to be very light, drain the Generator
at least once each year.
d. Also, see the TROUBLESHOOTING
and CORRECTIVE MAINTENANCE
which follow. If descaling by
thermal shock is required, schedule
that procedure in ROUTINE
MAINTENANCE
Check the pressure control at least once every 3
months. Make any necessary adjustments per
steps OP4 through OP8 of the OPERATING
PROCEDURES Section.
DRAIN THE HEATER as follows:
RM1. Close all stop valves in the Primary
Steam inlet and Condensate outlet lines.
RM2. RM2. In this order, close the stop valves
in:
a. the Cold Water inlet line
b. the Secondary Steam outlet line,
RM3. Carefully open the relief valve in the
Generator top head to relieve pressure
in the Generator shell.
RM4. With the relief valve being held open (to
prevent creating a vacuum), open the
drain valve and drain the Generator
completely.
RM5. To refill the Generator and place it back
into service, close the drain valve and
follow steps OP1, OP12 and OP13 in
the OPERATING PROCEDURES
Section.