Bryant 234B - Manual (Page 12)

SEP/02/2008/TUE 08:20 AM UTC TECH PUB
CLEANING STEAM BOILERS
Caution: The boiler should not be left unattended
d u r i n g the cleqn-out process.
1, Skimming off Impurities
Some of the impurities in the boiler water will float
on the water .and must be skimmed off. Run a tem­
porary connection from the skimmer tee.
With the boiler empty and cool, slowly begin to add
After water has' entered boiler-never before-
turn main gas burners and adjust flame at main
manual shut-off valve so that the water being added
is kept just below boiling point. Avoid boiling and
turbulence-
Gradually raise hot .Water level to tee being careful
not to raise it above the opening in the tee. Skim
until there is no trace of impurities. Repeat process
if necessary.
Water may be checked to make sure it is free from
oil by drawing off a sample at the skimming tee. If
the sample its reasonably free from oil, it will *not
froth when ^boiled on a stoye. This test does not
indicate the amount'of sedment which may lay in
the bottom of the boiler. It is therefore necessary
that the iboiler ;be further cleaned by 'blowing down'. ,
2. “Blowing Down" Boiler
Before blowing down the boiler, fill if to the water
line. Light burners and allow five pounds of steam
pressure to build up. Run a temporary connection
from one of the drain valyes to a .nearby sewer.
... Cotih.ect .to a .drain ^v^lve oh ihe oppp the..
boiler from the feed water inlet, if possible. Shut
off the gas burners, open drain valve and blow down
entire contents of boiler.
Allow boiler to thoroughly cool and slowly refill to
water line. Repeat Step 2 as many times as required
' until blow'off water is 'clear........ ......... . ............
FAX No, 317 240 5662 P. 012
Sal Soda (washing soda) is sometimes usOd for ex­
ceptionally dirty boilers buf its Use requires'e?i-
treme caution. The boiler can be seriously harmed
if the soda is not thoroughly washed out or at least
sufficiently so that the water does riot ekceed the
pH value of 7 to 8. Soda is difficult to ;remo,ve and
requires a lengthy process of repeatedly Hushing
the boiler to assure complete removal. t/
If spjla is insisted ripon it is recommended that a
solution of one pound dissolved in a pail of hot
water, be prepared for each ten gallons of boiler
water. (Check water capacity of boiler). Pour the
solution in any convenient opening at, or above the
flow tapping. Fill boiler to flow tapping and adjust
fire manually to maintain simmering for live or six
hours. Increase fire to build up five pounds pressure
and blow down boiler. '
Blow down boiler again as in Step 2, then flush con­
tinuously until it is certain-that boiler is free of the
soda. After the boiler has ‘been thoroughly cleaned,
add fresh, clear water to the proper level in the
heating system. If the degree of acidity or alkalinity
of the water must be adjusted, it is recommended
that the water be mildly alkaline, not exceeding a
pH value of 7 to 8.
).
3. Using Cleaning Compound
If an exceptional amount of dirt or sludge seems to
be present in the boiler, a boiler cleaning compound
made by a reputable manufacturer may be used ac­
cording to the instructions of the manufacturer of
the compound. When any type of cleaning compound
is used, care must be taken to thoroughly flush all
traces of the compound out of the boiler.
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