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Rev.4 del 01/2011 O.M.A.C. s.r.l.
4.5.2 First start-up
ATTENTION
The B series lobe displacement pump part of the LDPU can also operate when empty because the moving parts are not in contact with each other,
except for the sliding faces of the seals that, especially at high speeds, tend to overheat. For this reason, it is recommended to never let the B Series lobe
displacement pump operate dry for long periods so not to cause premature wear of the sealing parts.
The allowed dry operation period depends on the rotation speed and materials of the sliding faces of the seals but, in any case, it is recommended not to
exceed 5-10 minutes for soft materials and 10-15 seconds for hard carbides.
•
start the LDPU possibly on reduced speed to then increase up to working speed, checking any anomalies (pump over-pressure, piping leaks,
cavitation, vibration, etc.);
•
if the working speed is very high it is normal for the temperature of the pump gear box to reach 50°C - 60°C, especially in the fi rst hours of
operation;
4.6 Stopping instructions
When the LDPU stops one must intervene on the electric control panel, present on the machine or on the plant of the Customer, and intervene on:
•
emergency stop, if a situation of danger is occurring;
•
general selector, for a machine stop.
Once one of the two buttons has been pressed, one must:
•
disconnect power and block the power device so that the LDPU cannot be operated;
•
close the valves placed on the suction and discharge side;
•
de-pressurise, if present on the LDPU, the pneumatic safety valve on the front cover;
•
empty and de-pressurise the pump and suction and delivery piping system connected to the LDPU;
DANGER
If the process fl uid is very hot, or in any case above room temperature, one must let the LDPU cool down, with particular reference to the pump and parts
in direct contact with the process fl uid, until reaching room temperature.
•
carefully read Chapter 5 relating to assembly and disassembly of the LDPU, before carrying out any maintenance or inspection operation of
the LDPU;
•
clean the outside of the pump before disassembly, as per section 3.4.1.1.
4.7 Instructions for restarting after a stop
In order to restart the LDPU one must:
•
open the valves placed on the suction and discharge side;
•
pressurise, if present on the LDPU, the pneumatic safety valve on the front cover;
•
intervene on the electric control panel, present on the machine or plant of the Customer, and:
- move the selector from position "0" to position "1" or "2", according to the rotation direction;
- press the START button.
4.8 Switch-off
To switch off the LDPU one must press the STOP key on the electric control panel present on the machine or on the plant of the Customer.
4.9 Emptying
To empty the LDPU, after machine down time, one must operate in the machine as described below:
•
stop the plant, as described in section 4.6;
•
use a hex spanner to remove the screws of the front the front cover and move the cover away from the pumping chamber;
•
let the remaining fl uid drain into a container to dispose of it according to the existing regulatory framework.
Once the excess fl uid has drained from the pump body, fully remove the cover and continue with the required operations
(maintenance, parts replacement, dismantling, etc.).
Via Giovanni Falcone, 8
42048 Rubiera (RE) - Italy
E-mail:info@omacpompe.com SitoWeb:www.omacpompe.com
O.M.A.C. s.r.l.
Tel.0522/629371 - 629923 Fax 0522/628980
5
Chap.4 - pag.
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