Elmo Rietschle R-WPB - Manual (Page 14)

Rietschle Thomas GmbH + Co. KG page 14 / 23
might be a change in the resistance after the machine has been operated for some time. This is caused by pipeline clogging, clogging of the tanks’ aeration openings
in wastewater treatment plants, etc., or by operators’ unfamiliarity (see Chapter 5.6).
Table 5 – Blower checks
Operating time
Check Lubrication
After 400 hours
Blower operation check.
In a dry continental climate, preserve the rotors and cylinders after a
six-week standstill. In a humid climate, preserve them sooner (see
Chapter 2.3).
Check of the oil bath levels.
First change of oil since the machine was
put into operation.
Check of the lubrication discs functioning
(the level moves slightly).
After 4,000 2) hours
Oil change
After 20,000 1) hours Oscillation power measurement (bearings)
After 40,000 1) hours
Bearings check by oscillation power measurement. Expected
replacement of the bearings.
Oil change
Notes:
1) Executed by the
Rietschle Thomas servicemen.
2) The oil change interval depends on the operating temperature of the oil bath (it also depends indirectly on both the input and output temperatures of the
transported air). If the oil temperature does not exceed 50 °C, you can change oil annually (after 8,000 hours). If the temperature is higher than 100 °C, you must
change oil four times a year (after 2,000 hours). If the temperature is 120 °C, you must change it monthly. You can detect the oil state by comparing an oil sample
with new oil. Dark and/or thick oil indicates contamination or the initial stage of carbonization; i.e., you must change it. Analyzing an oil sample is more reliable.
Table 6 – Blower set checks
Operating time
Check Lubrication
After 400 hours
Visual checks, checks of the blower set operation, bolted connections,
operating pressure, discharge temperature, noise level, and noise-
damping hood fan.
Check of the safety valve functioning (check smooth operation of the
PVO valve’s closing piston).
2)
Checks of the suction filter and the suction vacuum.
After 800 hours Checks of the driving elements, motor operation, and belt tension.
According to the electric
motors
Addition of lubricants to the bearings
according to the recommendations of the
motor Manufacturers; see the instructions
for motor operation and maintenance.
After 20,000 1) hours Expected minimal operating life of the bearings of the two-pole motors
After 30,000 1) hours
Expected minimal operating life of the bearings of the four-, six-, and
eight-pole motors
Notes:
1) Executed by the
Rietschle Thomas servicemen.
2) The control PVO valve maintenance – the valve need not be maintained during routine operation. Apart from the valve functioning check (see Chapter 5.2), you
must ensure that all joints are tight, particularly after reassembling or handling the valve. With respect to the PVO 200 valve, you must also check the tightness of
the cap in the top base if the lifting eye was used for valve handling (check the tightness with soapy water, for example). If any leakage occurs, the pressure in the
rubber bellows will drop and the valve will open. The same effect is caused by a clogged sieve or a blocked nozzle of the control valve (you must clean the sieve or
blow through the nozzle).
WARNING! During any service operation, the
blower must be turned off and secured against being
turned on. If technical conditions, cautions, and/or
warnings are violated, Rietschle Thomas cannot
provide a guarantee.
If your operation demands are unusual, please
contact Rietschle Thomas.
When contacting Rietschle Thomas, please state the
following:
• The serial number and type of the blower;
• The serial number and type of the blower set;
• The serial number and type of the motor;
• The failure(s); and
• The measures you have taken to remove the failure(s).
If the blower must be dispatched to the production plant,
please drain oil. You should also lubricate the unpainted
parts with preservative oil and put covers on the blower’s
suction and discharge sections. Motors to be dispatched
for repair must be without pulleys and/or couplings.
For an additional charge, the Rietschle Thomas
servicemen can execute the checks of blowers and blower
sets mentioned in Chapter 5.9, Table 5, including
diagnostic measurements of the bearing state and
oscillation power of the blowers and electric motors.
These precautionary activities could prevent serious
failures.
Contact addresses:
www.rtpumps.com
• Standard blowers must not be operated if the direction
of rotation is opposite.
• Standard blowers must not be pressure-overloaded; the
maximum permissible compression ratio is 2.
• Standard blowers must not be thermally overloaded.
• Standard blowers must not be operated in explosion-
hazard environments.
• The sizes of intake medium impurities must not exceed
the values stated in Chapter 3.4.
Health and Safety Protection at Work
Rietschle Thomas blowers meet European Standards for
health protection; nonetheless, they might endanger health.
In order to prevent injuries, authorized workers must
observe the following rules:
• The operators must be trained and instructed.
• All operations must be executed according to this
manual.
• No solid, liquid, and/or powdery material must be
present in the suction space.
• If you are unsure or uncertain, contact Rietschle
Thomas.
• Blowers must not be handled when the machine is in
operation.
5.11
I
NFORMATION
ON IMPROPER
5.12
I
NFORMATION ON
RESIDUAL RISKS
5.9 R
OUTINE
MAINTENANCE
AND CHECKS