Carrier Aquazone 50WD handleiding

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Handleiding

Table 3 — Water Quality Guidelines

CONDITION

MATERIAL

NOTE(S):

a. Heat exchanger materials considered are copper, cupronickel, 304 SS (stainless steel), 316 SS, titanium.

CLOSED

RECIRCULATING

b. Closed recirculating system is identified by a closed pressurized piping system.

OPEN LOOP AND RECIRCULATING WELL

c. Recirculating open wells should observe the open recirculating design considerations.

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

All N/A pH < 7.5 and Ca Hardness, <100 ppm

Index Limits for Probable Scaling Situations (Operation outside these limits is not recommended.)

Scaling indexes should be calculated at 150°F for direct use and at 90°F for indirect HX use. A monitoring plan should be implemented.

Ryznar Stability Index

All N/A 6.0 to 7.5

If >7.5 minimize steel pipe use.

Langelier Saturation

Index

All N/A –0.5 to +0.5

If <=0.5 minimize steel pipe use.

Based upon 150°F direct well, 85°F indirect well HX.

Iron Fouling

Iron Fe

(Ferrous)

(Bacterial Iron Potential)

All N/A <0.2 ppm (Ferrous)

If Fe

(ferrous) >0.2 ppm with pH 6 to 8, O

<5 ppm, check for iron bacteria.

Iron Fouling

All N/A <0.5 ppm of Oxygen

Above this level deposition will occur.

Corrosion Prevention

d. If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious corrosion problems exists.

Sulfides in the water quickly oxidize when exposed to air, requiring that no agitation occur as the sample is taken. Unless tested immediately at the site, the sample will

require stabilization with a few drops of one Molar zinc acetate solution, allowing accurate sulfide determination up to 24 hours after sampling. A low pH and high alkalinity

cause system problems, even when both values are within ranges shown. The term pH refers to the acidity, basicity, or neutrality of the water supply. Below 7.0, the

water is considered to be acidic. Above 7.0, water is considered to be basic. Neutral water registers a pH of 7.0.

To convert ppm to grains per gallon, divide by 17. Hardness in mg/l is equivalent to ppm.

All 6 - 8.5

Monitor/treat as needed.

6 to 8.5

Minimize steel pipe below 7 and no open tanks with pH <8.

Hydrogen Sulfide (H

All N/A <0.5 ppm

At H

S>0.2 ppm, avoid use of copper and cupronickel piping or HXs.

Rotten egg smell appears at 0.5 ppm level.

Copper alloy (bronze or brass) cast components are acceptable to

<0.5 ppm.

Ammonia Ion as

Hydroxide, Chloride,

Nitrate and Sulfate

Compounds

All N/A <0.5 ppm

Maximum Chloride Levels Maximum allowable at maximum water temperature.

50°F (10°C) 75°F (24°C) 100°F (38°C)

Copper N/A <20 ppm NR NR

Cupronickel N/A <150 ppm NR NR

304 SS N/A <400 ppm <250 ppm <150 ppm

316 SS N/A <1000 ppm <550 ppm <375 ppm

Titanium N/A >1000 ppm >550 ppm >375 ppm

Erosion and Clogging

Particulate Size and

Erosion

All <10 ppm of particles and

a maximum velocity of 6

fps. Filtered for maximum

800 micron size.

<10 ppm (<1 ppm “sandfree” for reinjection) of particles and a maximum

velocity of 6 fps. Filtered for maximum 800 micron size. Any particulate

that is not removed can potentially clog components.

Brackish All N/A Use cupronickel heat exchanger when concentrations of calcium or

sodium chloride are greater than 125 ppm are present. (Seawater is

approximately 25,000 ppm.)

LEGEND

HX — Heat Exchanger

N/A — Design Limits Not Applicable Considering Recirculating Potable Water

NR — Application Not Recommended

SS — Stainless Steel

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