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testing with hydrion paper which is used in the
same manner as litmus paper, except it gives
specifi c readings. A color chart on the side of the
small hydrion dispenser gives the reading in pH.
Hydrion paper is inexpensive and obtainable
from any chemical supply house or through your
local druggist. The pH should be higher than
7, but lower than 11. Add some of the washout
chemical (caustic soda), if necessary, to bring the
pH within the specifi ed range.
f. Boiler is now ready to be put into service.
2. WATER BOILERS
a. Filling of Boiler and System — General —-In a
hot water heating system, the boiler and entire
system (other than the expansion tank) must be
full of water for satisfactory operation. Water
should be added to the system until the boiler
pressure gauge registers 12 psi. To insure that the
system is full, water should come out of all air
vents when opened.
b. Boiling Out of Boiler and System. The oil and
grease which accumulate in a new hot water
boiler can be washed out in the following
manner.
i.
Remove relief valve using extreme care to
avoid damaging it.
ii. Add an appropriate amount of recommended
boil out compound.
iii. Replace relief valve.
iv. Fill the entire system with water.
v.
Start fi ring the boiler.
vi. Circulate the water through the entire
system.
vii. Vent the system, including the radiation.
viii. Allow boiler water to reach operating
temperature, if possible.
ix. Continue to circulate the water for a few
hours.
x.
Stop fi ring the boiler.
xi. Drain the system in a manner and to a
location that hot water can be discharged
with safety.
xii. Remove plugs from all available returns
and wash the water side of the boiler as
thoroughly as possible, using a high-
pressure water stream.
xiii. Refi ll the system with fresh water.
c. Add appropriate boiler water treatment
compounds as recommended by your qualifi ed
water treatment company.
d. Make pH or Alkalinity Test.
After boiler and system have been cleaned and
refi lled as previously described, test the pH of
the water in the system. This can easily be done
76
by drawing a small sample of boiler water and
testing with hydrion paper which is used in the
same manner as litmus paper, except it gives
specifi c readings. A color chart on the side of the
small hydrion dispenser gives the reading pH.
Hydrion paper is inexpensive and obtainable
from any chemical supply house or through
your local druggist. The pH should be higher
than 7 but lower than 11. Add appropriate water
treatment chemicals, if necessary, to bring the pH
within the specifi ed range. With this lower level
of protection, care must be exercised to eliminate
all of the free oxygen in the system.
e. Boiler is now ready to be put into service.
C. FREQUENT WATER ADDITION
N
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A leaky system will increase the volume of make-up
water supplied to the boiler which can signifi cantly
shorten the life of the boiler. Entrained in make-up
water are dissolved minerals and oxygen. When the
fresh, cool make-up water is heated in the boiler the
minerals fall out as sediment and the oxygen escapes
as a gas. Both can result in reduced boiler life. The
accumulation of sediment can eventually isolate
the water from contacting the cast iron. When this
happens the cast iron in that area gets extremely hot
and eventually cracks. The presence of free oxygen
in the boiler creates a corrosive atmosphere which, if
the concentration becomes high enough, can corrode
the cast iron through from the inside. Since neither of
these failure types are the result of a casting defect the
warranty does not apply. Clearly it is in everyone's best
interest to prevent this type of failure. The maintenance
of system integrity is the best method to achieve this.
D. ATTENTION TO BOILER WHILE NOT IN
OPERATION.
N
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