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IV. Water Trim and Piping
Failure to properly pipe boiler may result in improper operation and damage to boiler or structure.
Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components, and can
lead to boiler failure. Burnham's Warranty does not cover problems caused by oxygen contamination of
boiler water or scale (lime) build-up caused by frequent addition of water.
A.
Design and install boiler and system piping to
prevent oxygen contamination of boiler water and
frequent water additions.
1. 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.
2. 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. Isolating the boiler from the system water by
installing a heat exchanger.
f. Use properly designed and operating air
elimination devices in water piping.
B.
Design boiler piping and flow rate to obtain proper
temperature rise though the boiler. (See Table 4)
Pressure relief valve discharge piping must be
piped such that the potential of severe burns
is eliminated. DO NOT pipe in any area where
freezing could occur. DO NOT install any shut off
valves, plugs or caps. Consult Local Codes for
proper discharge piping arrangement.
C.
Install Safety Relief Valve. See Figure 16.
Components are located in Water Trim Carton. Safety
Relief Valve must be installed with spindle in vertical
position.
1. Install ¾" NPT x 3½" lg. nipple in tapping "C". See
Figure 3.
2. Install safety relief valve on ¾" NPT nipple.
24
Table 4: Flow Rate, Temperature Rise, and
Pressure Drop
Boiler
Flow Rate
Temp. Rise
Model
(GPM)
Thru Boiler
21
20° F
805H
14
30° F
10
40° F
26
20° F
806H
17
30° F
13
40° F
28
20° F
807HE
19
30° F
14
40° F
34
20° F
808HE
22
30° F
17
40° F
38
20° F
809HE
25
30° F
19
40° F
42
20° F
810HE
28
30° F
21
40° F
Figure 16: Safety Relief Valve Installation
Boiler
Min. Boiler
Pressure
Piping NPT
Drop
1½"
3'
1¼"
2'
1¼"
1'
1½"
3'
1½"
2'
1¼"
1'
2"
3'
1½"
2'
1¼"
1'
2"
3'
1½"
2'
1½"
1'
2"
3'
2"
2'
1½"
1'
2"
3'
2"
2'
1½"
1'
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