Burnham 4FHL-107A, Инструкция по установке и эксплуатации

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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 waterside. 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 less makeup water.
Oxygen contamination of the boiler water will cause
corrosion of iron and steel boiler components, and can
lead to boiler failure. Burnham’s standard warranty does
not cover problems caused by oxygen contamination of
boiler water or scale (lime) build-up caused by frequent
water addition or by improper water chemistry as shown
below.
Une contamination de l’eau de la chaudière par l’oxygène
provoque la corrosion des composants en fer et en acier,
et peut mener à une défaillance. La garantie standard
de Burnham ne couvre pas les problèmes causés par
la contamination de l’eau de la chaudière par l’oxygène
ou l’accumulation de tartre (calcaire) qui découlent de
l’ajout fréquent d’eau ou d’une composition chimique
inadéquate comme illustré ci-dessous.
Minimum Water Quality Requirements
pH - 8.3 - 10.5
TDS - 3500 ppm
Total alkalinity ppm as CaCO
3
- 1200
Total copper ppm - .05
Oily matter ppm -1
total harness ppm -3 Chlorides - < 50 ppm
There are many possible causes of oxygen
contamination such as:
A. Addition of excessive make-up water as a result
of system leaks.
B. Absorption through open tanks and fittings.
C. Oxygen permeable materials in the distribution
system.
D.
Suction at pump and valve seals.
In order to ensure long product life, oxygen sources
should be eliminated. This can be accomplished by
taking the following measures:
A. Repairing system leaks to eliminate the need for
addition of make-up water.
B. Eliminating open tanks from the system.
C. Eliminating and/or repairing fittings which allow
oxygen absorption.
D.
Use of non-permeable materials in the distribution
system.
E. Isolating the boiler from the system water by
installing a heat exchanger.