Clayton Steam Generator model EO-100-1M
PAGE 34 / 70
Instruction Manual, doc.nr.: MAN18206 Rev A PSC
CHAPTER 8 :
PERIODIC MAINTENANCE.
8.1
GENERAL
Like any other piece of mechanical equipment, the CLAYTON steam generator must receive periodic
inspection and attention to maintain the efficiency and service it is designed to perform.
The following service recommendations require a few minutes each day and will maintain the efficiency of
the unit and minimize repairs and replacements.
A pad of monthly maintenance log sheets is included with each steam generator. Proper use of these sheets
provides an accurate record and serves as a daily reminder of routine maintenance. Extra pads are available
at request.
8.2
FEEDWATER TREATMENT
The importance of feed water treatment is discussed in detail in the
"FEED WATER TREATMENT
MANUAL".
To prevent internal corrosion and to eliminate scale formation, proper control of feed water
must be given serious consideration before start – up, during operation and wet shut down.
For automated plants that operate without permanent supervision, supplemental feedwater control
monitoring devices with lock-out function shall be provided on installation level.
8.3
DAILY SERVICE
8.3.1
FEEDWATER CONTROL
Test feed water according to the specifications of the
"Feed water Treatment Manual".
8.3.2
STEAM PRESSURE AND TEMPERATURE
Record feed water pressure and steam temperature. By comparing the measured values with those recorded
at initial start-up, coil restrictions can be noted.
8.3.3
STEAM TRAP TIMING
Check the operation time of the steam trap
( via manometer [41] )
under normal conditions , malfunctioning
of the generator can be noted. If a component such as the water pump (
which has a fixed pumping rate)
does
not work properly, the opening time of the steam trap will differ from above values.
8.3.4
MANUAL BLOWDOWN
Manual blow down is used to control dissolved solids and to remove suspended solids and sludge.
The manual blow down operation should be performed every 10 to 12 hours of operation. By daily chemical
test, the blow down frequency can be determined more accurately. At shutdown the blow down may be
performed any time during the day but at least one hour before the final shutdown.
Blow down sequence (see also instruction plate) :
•
With plant operating at normal steam pressure, close feed water intake valve
[20]
and open coil drain
valve
[25]
and separator drain valve
[32].
•
Progressively close steam discharge valve
[47]
in such a manner that steam pressure will remain just
below the modulation pressure. This will permit continuous burner operation.
•
Shut off plant after 60 s. Put switch
[S1]
in position "stop".
NOTE :
If the steam generator is equipped with an automatic blow down system,
the manual blow down may be eliminated from daily operation as long as the feed water
is tested daily for total dissolved solids
(TDS)
