Dilution Water Quality
Water used to dilute Chemical Specialties fluids
must meet certain minimum standards for purity. Impurities in dilution water
can increase metal corrosion, aggravate pitting of cast iron and steel,
reduce the effectiveness of corrosion inhibitors, increase inhibitor
depletion rate, cause formation of scale and other deposits on heat transfer
surfaces, and cause clogging of system components.
To assure inhibitor effectiveness, the levels of
chlorides and sulfates in water used to dilute Chemical Specialties fluids
should be less than 25 ppm each. Total hardness should be less than 100 ppm
expressed as ppm calcium carbonate. (See Tables on product label). Distilled
or deionized water is recommended. lf good quality water is unavailable,
pre-diluted solutions of fluids are available from Chemical Specialties.
Note: Use of well water will void all
To ensure maximum effectiveness for corrosion
protection, the inhibitor package is designed for a minimum 25-30 volume
percent concentration of glycol in water.
As indicated above, good quality water must be used for fluid make-up. In
addition, any flush water remaining in the system should be taken into
account when introducing and diluting Chemical Specialties fluids. In an
industrial system, it is not unusual to have left over flush water of up to
20 percent of the total system volume, although 10 percent is more common.
Introducing Chemical Specialties Glycol Fluid Products into Your
In most cases, solutions containing glycol-based heat transfer fluid are
mixed on a volume basis. If you wish to mix by weight percent, use Table 2
to obtain the volume-to-weight conversion. Following is the mixing procedure
for installing these fluids:
1. Calculate the quantity of fluid needed to achieve the desired results.
Table 5, which provides the number of gallons per 100 feet of pipe, may be
helpful in the calculation.
2. Introduce a sufficient quantity of water to check the system for
tightness. Pressure testing the system at this stage can be helpful. Often
pressure testing can be accomplished during the initial cleaning or flushing
of the system.
3. Drain enough water from the system to provide space for the inhibited
glycol quantity as calculated in Step 1.
4. Add the correct amount of fluid and any water needed to completely
refill the system, allowing for liquid expansion as needed due to the
5. Circulate for at least 24 hours to ensure complete mixing. Check the
liquid concentration with a refractometer or other method to assure that the
correct mixture is obtained.
Increasing or Decreasing the concentration of Inhibited Glycol in the
It is sometimes necessary to increase the concentration of the glycol
solution in your system, either to protect against cold weather, or to
replace fluid lost through leakage or moisture absorbed from the atmosphere.
There are other conditions which may require the dilution of inhibited
glycol already in the system. Either adjustment can be carried out in batch
or continuous operation.
Mixing Chemical Specialties Fluids with other manufacturer's products
Chemical Specialties fluids are formulated using proprietary corrosion
inhibitors for assurance of materials compatibility and non-toxicity
characteristics. Dilution and mixing of Chemical Specialties fluids with other
manufacturer’s products may compromise these critical requirements, is not
recommended, and may void any warranty.