Operating and Maintenance Manual 09/2019 – part I
Screw compressors
37
Periodic motor inspections:
The motor inspection should be performed at least once per 2 years.
The inspection should be performed by the in-house personnel or properly qualified
personnel from specialized companies.
Any repairs or special inspections should be performed by the specialised workshop or the
manufacturer service.
Replacement or lubrication of the motor bearings must be performed in accordance with
the manufacturer’s recommendations. The permissible hours of the bearing operation to
the replacement or lubrication are presented in the table below. When any symptoms
indicating the bearing damage occur (unusual noise or increased temperatures),contact
the service immediately.
8.3.13. Safety valve
The safety valves fulfil an important function in pressure equipment and systems. They
require particularly careful and professional service. Any operational shortcomings may
damage the valve mechanism, and consequently damage the entire pressure unit.
Therefore, during the equipment operation particular attention should be paid to the
following:
- Correct setting of the safety valve, appropriate to the operating parameters of the
equipment being protected,
- Appropriate protection of the valve mechanism against unauthorized adjustment and a risk
of damage. The valve seal must be intact,
- Periodic inspections of the valve for correct operation according to the requirements of the
office of technical inspection regulations.
The safety valve operation inspection involves blowing the valve by pulling the handle
(wheel) upwards. The pin, lifted by pulling the wheel up, releases the pressure of the valve
spring and moves the head a little up and allows the compressed air to flow through the
valve.
The handle can be loosened at the pressure equal at least 50% of the operating pressure
(fig. 20 and fig. 21).
The valves delivered require no special maintenance. They should only be periodically
(every 1000 hours) blown by pulling the handle of the push pin (fig. 20 and fig. 21). Special
care must be taken while performing this operation. Keep away from the stream of air blown
out (caution – the air may be hot!).
In case of the valve leaks, contact the manufacturer service to arrange its repair. The valve
cannot be repaired by the user itself.
Blocking the pin, tightening the adjustment nut or covering the valve outlets is not allowed.
In addition to the guidelines and requirements listed in this paragraph, the user is obliged
to observe the regulations being in force in the country in which the equipment is operated.
Hours of operation until the performance of service operations
3-22 kW
Maintenance-free 40000 h
Replacement
30-55 kW
Maintenance-free 20000 h
Replacement
75-90 kW
Requiring
maintenance
4000 h
Lubrication
110-200 kW
Requiring
maintenance
3000 h
Lubrication
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