Water Quality Standards; Hot Water Generator - Heat Controller HEV Series Installation, Operation & Maintenance Manual

Installation, Operation & Maintenance
Table 3: Water Quality Standards
Water Quality
Parameter
Scaling Potential - Primary Mea urement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.
pH/Calcium Hardness
Method
Index Limit for Probable Scaling Situation -
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
2+
Iron Fe (Ferrous)
(Bacterial Iron potential)
Iron Fouling
Corro ion Prevention
pH
Hydrogen Sulfide (H2S)
Ammonia ion
as hydroxide, chloride,
nitrate and sulfate
compounds
Maximum
Chloride Levels
Ero ion 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.
HEV/H SERIES

WATER QUALITY STANDARDS

Heat
Closed Loop
Exchanger
Recirculating
Material
All -
All -
All -
All -
All -
All 6 - 8.5
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 Hardne
(Operation out ide the e limit i 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 (Ferrou )
If Fe 2+ (ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria
<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.
18
Heat Controller, Inc.
<100ppm
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