Crown Boiler 24-12, 24-11, 24-10, 24-08, 24-06, 24-05, 24-09 Frequent Water Addition, Oxygen Corrosion

M. FREQUENT WATER ADDITION

IMPORTANT

IF, DURING NORMAL OPERATION, IT IS NECESSARY TO ADD MORE WATER PER MONTH THAN INDICATED BELOW, CONSULT A QUALIFIED SERVICE TECHNICIAN TO CHECK YOUR SYSTEM FOR LEAKS.

EXCESSIVE WATER ADDITION:

(Gal/Month)

24-03	16½	24-08	44
24-04	22	24-09	49½
24-05	27½	24-10	55
24-06	33	24-11	60½
24-07	38½	24-12	66

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 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. The maintenance of system integrity is the best method to prevent these types of failure.

N.OXYGEN CORROSION:

WARNING

Oxygen contamination of the boiler water will cause corrosion of iron and steel boiler components, and can lead to boiler failure. Crown's standard warranty does not cover problems caused by oxygen contamination of boiler water or scale (lime) build-up caused by frequent addition of water.

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.

In order to insure long product life, oxygen sources must 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.Consult your local water treatment specialist for specific recommendations.

53