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Gauges
Gauges for monitoring the pump’s working conditions
are recommended. These gauges should be placed
readable as close to the pumps in- and outlet flanges
as possible. On the ACE Optiline standard pumps there
are gauge connections for both in- and outlet.
Pressure relief valve
All systems with screw pumps must be equipped with
a pressure relief valve installed immediately adjacent
to the pump. In the standard versions of IMO ACE
Optiline pumps, this pressure relief valve is an integral
part of the pump to protect the system against excess
pressure. When liquid is circulated through the valve it
heats up in proportion to the set pressure level and the
percentage of by-passed liquid. 100% bypass can only
be tolerated for less than about 3 minutes, 50 %by-pass
generally for unlimited periods of time. If more than
50% recirculation is anticipated, a value specific to each
application should be determined by closely monitoring
the pump body temperature. If the pump is operating in
line with a separate pressure control valve (see fig.9),
the setting of the relief valve should be high enough
so as not to interfere with the control valve. Likewise, if
two pumps are operating in parallel, the setting should
be such that interference between the two valves is
avoided.
Also remember that a total bypass by the pumps
internal relief valve for longer periods will cut of the
cooling flow to the pumps magnetic coupling and
cause an overheating with destroyed magnets as a
result quite fast.
19
Oil leakage may make the floor slippery
and couse personal injury.
Fig. 8 Gauges
Fig. 9 Pressure Relief Valve
Fig. 10 External control with presssure relief valve
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