3000PB, 3700B, 4500B, 3000PVB, 3700VB, 4500VB User Manual
1. At the rear of the unit. Disconnect both the
inlets and discharge water lines.
2. Remove the drain plugs located at the bot-
tom of the aftercooler and lubricant cooler.
3. Allow the system to drain completely.
4.2.5
Water quality recommendations
Water quality considerations are crucial to the effective
operation of a water-cooled compressor and yet are the
most often ignored. Premature failure of components can
often be traced to a reduction in heat-transfer rate that
has resulted from a reduced flow rate due to scale build-
up in water-cooling lines or the coolers themselves.
To ensure maximum life expectancy and best perfor-
mance of the compressor cooling system, refer to
Table 4-3: Water tests.
4.2.5.1 Scale
Scale is formed from calcium carbonate, which precipi-
tates out of water. Calcium content tends to be higher in
water taken from wells than water taken from the surface
of lakes. A higher pH value will also assist in the forma-
tion of lime scale. In all cases calcium will form scale
when water that has dissolved calcium is heated. It then
forms lime-scale on surfaces such as the inside of pipes
and the tubing that comprises water coolers. Scale for-
mation on the inside of pipes and inside of heat exchang-
ers acts as a thermal insulator. This causes coolers to be
less effective, and piping to have reduced water flow,
making them less effective. Over time lime scale build-up
can reduce water flow by 80% or greater. This renders
the cooling system ineffective and will damage the sys-
tem. Scale can be controlled with water treatment.
Table 4-3: Water tests
Substances
Corrosivity hardness, pH, total dissolved solids,
temperature at inlet, alkalinity
Iron
Sulphate
Chloride
Nitrate
Silica
Desolated oxygen
Oil & grease
Ammonia
Monthly. If stable for 3 to 4 months,
Daily. If stable, analyze weekly.
02250216-786 R01
Subject to EAR, ECCN EAR99 and related export control restrictions.
4.2.5.2 Corrosion
As contrasted to lime scale build-up, corrosion eventually
causes a reduction in the wall thickness of pipes. High
levels of dissolved oxygen and low pH levels assist in the
creation of corrosive scale. A thin coating of lime scale is
often beneficial in helping to prevent corrosion from form-
ing.
4.2.5.3 Biological and organic fouling (slime)
The heightened temperatures of compressor cooling
operations help to reduce the likelihood that organic foul-
ing will become a major concern. In the event of an infes-
tation, commercial chemical shock treatments are
available to control any outbreaks.
4.2.6
Seawater-cooled units
If seawater is to be used for cooling, optional
copper-nickel coolers must be selected.
Water cleanliness is critical for operation of the compres-
sor. A strainer must be installed in the inlet piping of the
water system. It is also recommended that a solenoid
valve (normally closed) be installed into the water outlet
side of the compressor system. Consult the Sullair Ser-
vice Department for assistance in setting up these rec-
ommended precautionary functions. In addition, be
aware that cleaning of coolers as a result of fouling is a
customer responsibility.
Isolation valves with side drains should be installed on
both the inlet and outlet lines.
The recommended flow rate cannot be exceeded. An ori-
fice plate must be installed in the pipe-work at least 3.3 ft
Test interval
analyze quarterly.
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
4: Installation
NOTE
Acceptable concentration
Langerlier index 0 to 1
< 2 ppm
< 50 ppm
< 50 ppm
< 2 ppm
< 100 ppm
0 ppm (as low as possible)
< 5 ppm
< 1 ppm
45