Daily Checks; Weekly Checks; Six Monthly Checks; Periodic Check Of The Safety And Emergency Devices - OMAC B Series Operation And Maintenance Manual

Rev.4 del 01/2011 O.M.A.C. s.r.l.

5.2.1 Daily checks

• Visual inspection of all sealing parts and of the general operation of the LDPU.
• If one experiences a loss of mechanical seals, see to replace them as soon as possible, to prevent the process fl uid from entering the bearings
box or stagnating on the ground.

5.2.2 Weekly checks

• Check the oil level of the pump and motor unit, eventually top-up with oil of the kind indicated by the manufacturers, after having checked the
proper amount and the degree of viscosity on the respective use and maintenance manuals.
• Inspect the pumping chamber and free it from any scaling due to the kind of process fl uid.
• Check that there is no seizing between the rotors and the static surfaces of the pumping body.
• Check that the mechanical safety valve on the cover, when provided, is not blocked by a long period of inactivity. To check simply remove the
adjustment screw completely (pos.59 page 29) and then adjust the calibrations of the spring again.

5.2.3 Six monthly checks

• If the LDPU works constantly at high temperatures, above 120°C, check the integrity of the pump lubricant oil; if it has gone dark in colour, see
to its replacement. The same goes for the motorisation unit; keep to the instructions of the manufacturer.
• Check that the distribution gears have not reached such a play to enable the rotors to come into contact; in this case replace the worn
gears.
• Check the stiffness of the shafts: if there is even minimal axial or radial play, see to the replacement of the bearings.
• Check the corrosion condition of the bearings box; if needed re-paint with suitable paint and protect it from premature wear. The "B series lobe
displacement pump" is painted as standard with EPOXY ENAMEL GLOSS RAL 7032.
NOTE
By systematically following these checks, the pump will maintain its original performances unchanged for many years.
5.3 Periodic checks of the safety and emergency devices
When the LDPU is fi tted with an electric control panel, one must carry out weekly checks for the correct operation of the actuators and operation of the
relative warning lights.

5.4 Indication of dangerous temperatures

In the event of pumps predisposed for pumping products at high temperatures up to 150°C, there is a signal placed on the same pump that warns the
operators of the presence of high temperature surfaces, as shown in fi gure C:

5.5 Oils present

• Check the oil level placed on the side of the pump daily; it must always be completely full when the pump is switched off.
• If needed, restore the level by adding oil with reference to section 1.3.12 of this UMM, relating to the degree of viscosity and the proper
amount, expressed in litres, for every LDPU size.
• If the pump is used with vertical openings, check the proper position of the vent cap and level and if needed invert them.
• Oil replacement must take place after a run-in period of about 150 working hours, subsequently every 2500 hours.
• If the gear box works constantly at temperatures above 90°C, lubricate with oil with a higher degree of viscosity (see section 1.3.12) and
replace it every 1000 working hours.
5.6 Tests and checks
Listed below are the checks to be performed, at predetermined intervals, on the LDPU.
5.6.1 Lubrication
The LDPU has other mechanical elements that during maintenance require lubrication: these components are the sealing parts.
In assembly and disassembly operations there are the specifi cations relating to the surfaces to be lubricated with grease and the stages in which this
operation must be carried out.

5.6.2 Single mechanical seals

• Mechanical seals do not require any maintenance.
• When there is a leak, caused by wear and contact surfaces, see to replace the whole seals (see disassembly instructions).
• In case of extended operation with worn seals, check that some process fl uid leaks outside the pumping body.
IMPORTANT:
it is recommended to not let the mechanical seals turn when dry.
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
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Chap.5 - pag.