AERCO Steam Generator - Manual (Page 16)

INSTRUCTIONS – AERCO HELITHERM STEAM GENERATOR MODEL SS1B-PLUS
SG-101-14
DISASSEMBLY
Reference illustrations:
SG-101-4 Over-Pressure Limit System
Wiring Diagram
SG-101-8 Generator Control Box
Assembly
SG-101-9 Generator Assembly
SG-101-10 Generator Package Assembly
Special Tools Required;
(1) Torque wrench for 5/8" nuts.
(2) A block and tackle or ratchet or winch hoist
is recommended for lifting off the Generator top
head and shell, or for lifting and moving the
Generator.
NOTE that all part item numbers given in
parentheses ( ) in the instructions below refer to
those shown in Figure SG-101-8, SG-101-9, or
SG-101-10.
D1. Shut down and drain the Generator in
accordance with steps RM1 through
RM4 under ROUTINE MAINTENANCE
above.
D2. Disconnect ALL external piping from the
Generator top head, including that to the
Relief Valve (24). Disconnect the
Secondary Steam outlet piping at the
union or flanges located beyond the
outside diameter of the Generator top
head.
D3. Disconnect Union (29) located above
the Level Controller (34).
D4. Disconnect the power supply wiring to
the Control Box and the wiring between
the Control Box and the Level
Controller,
D5. Disconnect the air supply and control air
piping from the Control Box.
D6. Close the Shutoff Cock (38) in the
Primary Steam Pressure Gage line and
disconnect the Compression Fitting (25).
D7. Mark the edge of the Generator bottom
head flanges in order to indicate their
correct relative positions upon
reassembly.
D8. Remove Nuts (l4) and Studs (12) from
the Generator bottom head flanges.
D9. Using a hoist or block and tackle
attached to the Lifting Lugs (2) on the
Generator top head, CAREFULLY lift
the top head and shell STRAIGHT UP
off the Generator riser and coil,
assembly., DO NOT SCRAPE the shell
lining against the coil tubing.
D10. Clean and inspect the inside of the shell
and the Steam Riser/Condensate
Return/Coils assembly for obvious
damage.
D11. With the Condensate Return stop valves
closed, open the stop valve(s) in the
Primary Steam inlet line to allow Primary
Steam to the Generator coils. Any leak
in the coils. Steam riser, or Condensate
return will become visible quickly. Note
where the leaks are and shut off the
Primary Steam.
D12. If a coil must be replaced, use a 1-5/16"
open end wrench to disconnect the
unions holding the coils to the Steam
riser and Condensate return. Be careful
not to damage the spud threads (see
Figure SG-101-6).
D13. If either the Steam riser or Condensate
return must be replaced, it is
recommended that the Generator be
reassembled and returned to the
AERCO factory for replacement.
(AERCO has the proper factory setup,
pressure testing equipment, ready
access to any needed additional parts,
and the expertise necessary to provide
a guaranteed replacement.) Contact the
nearest AERCO Representative for
instruction for making the return.