Maintenance | 8
Hidrostal AG 35 / 49
8.4.4 Checking the oil
8.4.4.1 Purpose of checking the oil
The oil chamber acts as a barrier between the pump chamber on the one
side and the drive on the other. It prevents the medium leaking into the drive
unit.
The oil also dissipates heat from the drive unit to the medium and thus cools
the pump.
The oil chamber is sealed using a mechanical seal on the pump chamber
side and the drive side.
A mechanical seal is a "dynamic seal" which does NOT seal perfectly.
However, there is only little leakage through an intact seal.
Operational wear, in particular when conveying abrasive media, increases
the leakage of the mechanical seal to the pump chamber, and allows more
of the medium to enter the oil chamber.
Provided that the pump is fitted with a moisture sensor (option for BN3 and
BK3 only), and the sensor signals are properly evaluated by the control unit,
an alarm is triggered if an excessive amount of liquid leaks into the oil
chamber. The pump can then be shut down and repaired before costly
damage is caused to the drive unit.
If
• the pump is NOT fitted with a moisture sensor or
• the moisture sensor is NOT analysed by the system control
• a non-conductive medium is circulated or
• you are unsure whether the moisture sensor is working correctly or if its
measurements are evaluated correctly,
the oil must be checked regularly.
In this way, any damage of the mechanical seal on the pump chamber side
can be detected in time, and the pump can be shut down and repaired
before costly damage is caused to the drive unit.
If the mechanical seal functions properly, the oil is not subject to operational
wear, and can be used for an almost unlimited time.
Personnel:
• Trained personnel
Protective equipment:
• Safety goggles
• Protective clothing
• Safety shoes
Required tools:
• Clean collection tank
• Transparent beaker
• Funnel with a fine-particle sieve and/or filter paper
Prerequisites:
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