Cooling Water Quality And Treatment; Minimum Coolant Requirements - Kohler SFGLD480 Operation & Maintenance Manual

Generator set models 750/1000rezk

Table of Contents

Minimum coolant requirements.

PARAMETERS

Aspect and odour

pH value 25ºC

Total hardness

-2

Sulphates SO

Chlorides Cl

Nitrates

Total dissolved solids (TDS)

Conductivity @ 25ºC

Total alkalinity

Iron Fe

Aspect and Odour: Water-borne chemical compounds like phenols, several hydrocarbons, chlorine, organic

matters in any state of decomposition or the products of outgassing algae and fungi can give water a very

strong odour and taste, even if said compounds exist only in very small concentrations. Salts or minerals give

water a salty or metallic taste, but not always an odour.

Particles such as clay and silt, a.o., although not dissolved, are transported by water in either of two ways: as

a colloidal solution or in a dissolved condition that only persists while these particles are carried away by the

flow of water. Colloids will settle only if undergoing coagulation or flocculation (clumping of particles).

Ph: The pH value expresses the acidity or alkalinity of an aqueous system. To be precise, it is the measurement

of the hydrogen ion "activity" in a given sample; in practical terms, it is a measure of the hydrogen ion concentration

in a sample Since the pH scale is logarithmic and inverse, any increase in pH by one unit corresponds to a tenfold

decrease in the hydrogen ion molar concentration. The lower end of the scale (pH = 0) defines the acidity

equivalent to a solution of 1.0 M HCl whereas the upper end of the scale (pH = 14) represents the alkalinity

equivalent to a solution of NaOH 1.0 M.

Total hardness: The sum of temporary and permanent hardness. This is the sum of water dissolved metallic

ions. It is always stated in mg /l CO3Ca

Temporary hardness: caused by acid calcium or magnesium carbonate. These bicarbonates precipitate, as

water warms up, to form insoluble carbonates.

Permanent hardness: due to the contents of sulphates, nitrates and calcium, magnesium, sodium and iron

chlorides. These salts do not precipitate as solutions.

Sulphates: Salts that dissociate in an aqueous solution and form ions which combine with calcium and

magnesium. These compounds combine with hydrogen to form acids which turn water corrosive.

Chlorides: The amount of chloride ions present in the system enhances the conductivity of water and affects

the protective film on the metallic surface, creating a favourable atmosphere for corrosion.

Nitrates: Salts that, in an aqueous solution, combine with hydrogen to form aggressive corrosive acids that

may damage the cooling system.

Total alkalinity: Water alkalinity may be defined either as the water capacity to neutralise acids, react with

hydrogen ions, or accept protons or as a measure of the water total contents of alkaline substances (OH-).

Determining total alkalinity and different forms of alkalinity is important in chemical coagulation, softening and

corrosion control processes.

PRODUCT INFORMATION

IO-C-M-20-001e