14
Water treatment is required for satisfactory operation of steam boilers to prevent both deposition of scale and
corrosion from acids, oxygen and other harmful elements that may be in the water supply. A qualified water
treatment specialist should be consulted to establish a proper water treatment program
.
8.5 Element Replacement Procedure (4-Bolt Style Element)
CAUTION:
Before element replacement, make certain main power to the unit is turned off, that there is no
pressure in the unit, and that the unit is drained below the element opening.
NOTE:
To prevent hazardous conditions of leaking water / steam at the element terminal ends, defective
elements or element gaskets should be replaced immediately upon leak detection
.
8.5.1
Adequately tag wire and then remove wires from defective elements
8.5.2
Remove element by removing the four (4) attachment nuts
.
8.5.3
Install replacement element with the new gasket and torque nuts to 10 -15 ft. lbs
.
WARNING:
Do not exceed 15 ft. lbs.
8.5.4
Connect phase wires to new element.
8.5.5
When the unit is filled and pressurized, check for leaks.
Table 2
Recommended Feedwater and Boiler Water Properties
FEEDWATER
Type
of
Boiler
Hardness (ppm)
pH
Oxygen
(cc/l)
TDS
(ppm)
Total Dissolved
Solids
Hot Water
0 – 10
7.5 – 9.5
4.0
0 – 500
Steam
0 – 5
7.5 – 9
.03
0 – 350
BOILER WATER
Type
of
Boiler
Hardness (ppm)
pH
Oxygen
(cc/l)
TDS
(ppm)
Total Dissolved
Solids
Hot Water
0 – 10
7.5 – 9.5#
0
0 – 5000
Steam
0
7.5 – 9.5#
0
0 – 3500
# - The limit of 9.5 pertains to copper elements; a pH of 10.5 is allowable for Incoloy elements.
