Water Quality Standards - Heat Controller HP Series Installation, Operation & Maintenance Manual

Heat Controller, Inc.
Table 3: Water Quality Standards
Water Quality
Parameter
Scaling Potential - Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.
pH/Calcium Hardness
Method
Index Limits for Probable Scaling Situations -
Scaling indexes should be calculated at 150°F for direct use and Hot water generator applications,
and at 90°F for indirect HX use. A monitoring plan should be implemented.
Ryznar
Stability Index
Langelier
Saturation Index
Iron Fouling
Iron Fe (Ferrous)
2+
(Bacterial Iron potential)
Iron Fouling
Corrosion Prevention
pH
Hydrogen Sulfide (H2S)
Ammonia ion
as hydroxide, chloride,
nitrate and sulfate
compounds
Maximum
Chloride Levels
Erosion and Clogging
Particulate Size and
Erosion
Notes:
• Closed Recirculating system is identified by a closed pressurized piping system. Recirculating open wells should observe the open recirculating design considerations.
• NR - Application not recommended.
• "-" No design Maximum.
18
HP SerieS

WATER QUALITY STANDARDS

Heat Closed Loop
Exchanger
Recirculating
Material
All -
All -
-
All
All -
All -
6 - 8.5
All
Monitor/treat as
needed
All -
-
All
Copper -
-
CuproNickel
-
304 SS
316 SS -
Titanium -
<10 ppm of particles
and a maximum
All velocity of 6 fps.
Filtered for maximum
800 micron size.
Open Loop and Recirculating Well
pH < 7.5 and Ca Hardness <100ppm
(Operation outside these limits is not recommended)
If >7.5 minimize steel pipe use.
If <-0.5 minimize steel pipe use. Based upon 150 °F HWG and Direct
well, 85°F Indirect Well HX
<0.2 ppm (Ferrous)
If Fe (ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria
2+
<0.5 ppm of Oxygen
Above this level deposition will occur.
Minimize steel pipe below 7 and no open tanks with pH <8
At H2S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.
Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.
Maximum Allowable at maximum water temperature.
50°F (10°C) 75°F (24°C)
<20ppm
<150 ppm
<400 ppm
<1000 ppm
>1000 ppm
<10 ppm (<1 ppm "sandfree" for reinjection) of particlesand a maximum
velocity of 6 fps. Filtered for maximum 800 micron size. Any particulate
that is not removed can potentially clog components.
20
Installation, Operation & Maintenance
6.0 - 7.5
-0.5 to +0.5
6 - 8.5
<0.5 ppm
<0.5 ppm
100°F (38°C)
NR NR
NR NR
<250 ppm <150 ppm
<550 ppm < 375 ppm
>550 ppm >375 ppm
Rev.: 04/04/04