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Certain state and local codes may restrict the use of some
chemicals listed for cleaning and maintaining the boiler.
Check with local authorities before proceeding with the
use of any chemicals.
L’utilisation de certains des produits chimiques indiqués
pour le nettoyage et l’entretien de la chaudière peut être
restreinte par les codes municipaux ou provinciaux. Il
convient de s’informer auprès des autorités locales avant
de procéder à l’utilisation de tout produit chimique.
B.
Drain about 5 gallons of hot water from boiler
into a container and dissolve into it 1 pound of
caustic soda and one pound of trisodium
phosphate for each 50 gallons of boiler water.
C.
Add solution through exposed tapping, and
reinstall safety valve.
D.
Fill the entire system with water.
E.
Start firing the boiler.
F.
Circulate the water though the entire system.
G.
Vent the system, including the radiation.
H.
Allow boiler water to reach operating
temperature, if possible.
I.
Continue to circulate the water for a few hours.
J.
Stop firing the boiler.
K.
Drain the system in a manner and to a location
that hot water can be discharged safely.
L.
When the boiler has cooled down to 120°F or
less, remove plugs from all available returns and
wash the water side of the boiler as thoroughly as
possible, using a high-pressure water stream.
M.
Refill the system with fresh water, and bring
water temperature to 180°F promptly in order to
drive off any dissolved gases.
7. WATER BOILER OPERATION
The following guidelines relating to system water
temperature fluctuation and flow through boiler must be
observed.
A.
It is important to operate your boiler in such a
manner as to prevent temperature fluctuation of
more than 40°F at any time. Rapid temperature
changes within the boiler can create stresses in
the boiler metal. These stresses can cause
damage to the boiler by loosening tubes, or in
more severe instances can crack tube sheet
ligaments, furnaces, or waterlegs.
B.
It is equally important to insure that there is
circulation through the boiler of at least 1/2 GPM/
BHP at all times when the boiler is firing.
8. BOILER WATER TREATMENT
Boiler water treatment will help maximize the
effectiveness and prolong the life of pressure
vessels.
The general objectives of boiler water
treatment are:
A.
Remove corrosive gases from feedwater and
boiler water.
B.
Prevent sludge and scale deposits on the water
side heating surfaces.
C.
Prevent foaming and carryover.
Consult with a local water treatment company regularly
engaged in the treatment of boiler water for advice in
maintaining the proper feedwater, boiler water, and
condensate chemistry.
Pour obtenir des conseils sur le maintien d’une composition
chimique adéquate pour l’eau d’alimentation, l’eau de
la chaudière et le condensat, consulter le personnel
d’une station de traitement des eaux locale qui traite
régulièrement des eaux de chaudière.
Certain state and local codes may restrict the use of
some chemicals listed for cleaning and maintaining
the boiler. Check with local authorities before
proceeding with the use of any chemicals.
9. MAKE PH OR ALKALINITY TEST
After boiler and system have been cleaned and
refilled as previously described, test the pH of the water
in the system. This can easily be done 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 exact readings. A small color chart
on the side of the 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 8.3 but lower
than 10.5. Add some washout chemical (caustic soda), if
necessary, to bring the pH within the specified range.
10. FREQUENT WATER ADDITION
If, during normal operation, it is necessary to add water
more frequently than once a month, consult a qualified
service technician to check your system for leaks.
S’il est nécessaire d’ajouter de l’eau plus d’une fois par
mois à une chaudière utilisée normalement, consulter un
technicien d’entretien qualifié afin de vérifier la présence
de fuites dans votre système.
A leaky system will increase the volume of make-up
water supplied to the boiler which can significantly
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
