Repair manual

MAINTENANCE INSTRUCTIONS FOR
STEAM GENERATORS
(EXCEPT THOSE EQUIPPED WITH TWO PROBES)
WARNING: Steam under pressure may cause
serious Injury and bodily harm when It is accidentally
or carelessly released. Therefore, service of the steam
generator should only be performed by trained and
experienced personnel, thoroughly familiar with
servicing steam generators.
CAUTION: Never work on the steam generator when
It is hot or pressurized.
Every steam generator shipped is equipped with at least
one corrosion resistor (cathodic). The larger capacity
steam generators will have two corrosion resistors
The hand hole plate and gasket on your steam generator
stops the escape of steam through the hand hole
opening during operation.
1) Turn of all energy sources to steam generator.
Drain steam generator
2) Remove hand hole cover plate from steam
generator.
3) Hang corrosion resistor from the right side of the front
stay rod. away from the probes. Clean scale and rust off
a portion of the stay rod. so the hanger will rest on the
bright, bare metal
4) Re -install the hand hole plate, along with a new
gasket.
The hand hole plate should be cleaned and examined
every time it is removed. If the hand hole plate is chipped
or cracked, or over three years old. install a new one.
Because continuous use and possible abuse cause
metal fatigue which weakens the hand hole plate. a new
one should be installed at least every three years.
CAUTION: Never tighten the hand hole plate nut
when steam generator is in use, hot, or otherwise
pressurized. Never tighten nut over 15 footpounds
torque. Overtightening may cause uneven stress,
which may result In the weakening and possible
breakage of the plate.
Replace the gasket whenever the hand hole plate is
removed or replaced. Keep a spare gasket on hand at all
times.
Replace the gasket at least once a year. or sooner if it is
cracked, torn or hardened.
Leakage of water past the hand hole plate should not be
allowed to continue, as this will cause pitting of the
metal in contact with the gasket.
5) After re-installing the hand hole plate, close the steam
generator drain valve. Turn on energy sources.
6) Start up and operate steam generator long enough to
observe that it is operating properly.
The corrosion resistor is sacrificial and must be replaced
at regular intervals just before it is entirely consumed.
Frequency of replacement can only be established by a
regular inspection for how much of the protector remains
and whether scaling or pitting has begun. Scaling
indicates a very hard w ater condition Pitting indicates an
excess acid condition. In either case. more protectors or
more frequent replacement of them is necessary. The best
way to reduce servicing time and to assure long generator
life is to provide feed water that is low in solids content
and low in gas content. Water that is fit to drink can still
be high in impurities that are highly detrimental to a steam
generator Consult a water treatment specialist in your
area for recommendations concerning steam generator
feed water treatment.
Under average conditions, the corrosion resistor provides
about six months of service. An average condition would
meet each of the following tests:
1) Less than 8 hours of steam generation a day.
2) One generator blowdown every day.
3) Moderately hard water. Less than 85 ppm.
4) Water containing less than 60 ppm Total Dissolved
Solids.
CLEVELAND RANGE CO., 1333 EAST 179th ST., CLEVELAND, OHIO 44110
Manufacturer reserves right of design improvement or modification as warrantee
Distribution of hard water in the
U.S. is shown on map. right. Areas
shown in black have hardest
water, while relatively soft water is
found in white areas. Shaded areas
require supplemental teed water
treatment to remove or to reduce
the hardness.
This map is a general represen-
tation and exceptions do exist.
Consult a local water treatment
specialist for a water sample test.
0
-
60
parts per
million
60-120 parts per million
120-180 parts per million
above 180 parts per million