Heat Controller HTV Series - Water Quality Standards

Heat Controller, Inc. HTV/HTD/HTH SERIES
22
Notes:
• Closed Recirculating system is identified by a closed pressurized piping system.
pen recirculating design • Recirculating open wells should observe the o
considerations.
WATER QUALITY STANDARDS
Table 3: Water Quality Standards
Water Quality
Parameter
HX Material Closed Recirculating Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limit
pH Calcium
Hardness Method
All - pH ‹7.5 and Ca Hardness ‹100ppm
Index Limits for Probable Scaling Situations (Operation outside these limits is not recommended)
Scaling indexes should be calculated at 150°F operation for direct use and HWG applications, and at 90°F for indirect HX use. A monitoring
plan should be implemented.
Ryznar Stability Index All -
6.0 - 7.5
If >7.5 minimize steel pipe use
Langelier Saturation
Index
All -
-0.5 to +0.5
If <-0.5 minimize steel pipe use. Based upon 150°F
Direct well, 85°F Indirect Well
Iron Fouling
Iron Fe (Ferrous)
(Bacterial Iron Potential)
All -
<0.2 ppm (Ferrous)
If Fe (ferrous) >0.2 ppm with pH 6 - 8, ppm check for
Iron Fouling
All -
<0.5 ppm of Oxygen
Above this level deposition will occur
Corrosion Prevention
pH All
6 - 8.5
Monitor/treat as needed
6 - 8.5
Minimize steel pipe below 7 and no open tanks with pH <
Hydrogen Sulfide (H
2
S) All -
<0.5 ppm
At H
2
S>0.2 ppm, avoid use of copper and copper nickel
Rotten egg smell appears at 0.5 ppm level
Copper alloy (bronze or brass) cast components are okay
Ammonia ion as
Hydroxide, Chloride,
Nitrate and Sulfate
Compounds
All - <0.5 ppm
Maximum Allowable at maximum water temperature
50°F 75°F 100°F
Maximum Chloride Levels
Copper
Cupro Nickel
304 SS
316 SS
Titanium
-
-
-
-
-
<20 ppm
<150 ppm
<400 ppm
<1000 ppm
<1000 ppm
NR
NR
<250 ppm
<550 ppm
<550 ppm
NR
NR
<150 ppm
<375 ppm
<375 ppm
Erosion and Clogging
Particulate Size & Erosion All
<10 ppm of particles and a
maximum velocity of 6 fps filtered
for maximum 800 micron (800mm,
20 mesh) size
19
Notes:
• Closed Recirculating system is identified by a closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design
Notes:
• NR - Application not recommended
• “-“ No design maximum
Water Quality Standards