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O.M.A.C. s.r.l.
Via Giovanni Falcone, 8 42048 Rubiera (RE) - Italy Tel.0522/629371 - 629923 Fax 0522/628980
E-mail:info@omacpompe.com SitoWeb:www.omacpompe.com
Rev.4 del 01/2011 O.M.A.C. s.r.l.
Chap.5 - pag.
CHAPTER 5: B SERIES LDPU MAINTENANCE
Where provided, the contents of this chapter is specifi cally addressed to the internal company maintenance operator. This person, named directly
and formally by the Customer company management; has at least two years experience in this role and has the required technical abilities for operating
in safety conditions and interpret the technical indications contained in the above mentioned documentation properly.
DANGER
Before disconnecting the LDPU from its energy supplies, make sure that the plant or part of it is contained in complies with the following conditions:
absence of product and eventually washing;
absence of residual pressure;
temperature of contact surfaces not dangerous.
Before carrying out any maintenance operation on the LDPU pump, ensure one has carried out the pump and plant stopping operations, described in
section 4.5 “Use of the line: stopping instructions”
During the LDPU assembly and disassembly operations, as during its routine and extraordinary maintenance, one must wear the personal protection
equipment, according to the operation and risk connected to the activity performed by the appointed operator, as described in section 1.9.
5.1 Troubleshooting and solving problems
FAILURE: HIGH POWER ABSORPTION BY GPVL
POSSIBLE CAUSES: REMEDIES:
Excessive medium viscosity Decrease the speed of the pump, increase the temperature of the medium
Low medium temperature Increase the temperature of the medium, heat the pumping case (within the limits given by the manufacturer)
Excessive back-pressure
Remove possible obstructions in the outlet piping, increase the piping diameter, reduce its lenght and the number of the
bends
Too tight packing gland Loosen the packing gland and tighten it rightly (see instructions)
Excessive pump speed Decrease the speed of the pump
Piping press on pumping case Check the piping alignement, if necessary fi t fl exible expansion joints, and fi x the piping on the plant structure
Not aligned joint Check the alignement between pump and drive device
Worn out bearings Replace the bearings by the manufacturer
Worn out or untimed gears Replace the gears or time them according to the instructions
Wrong quantity / quality of gears oil Act according to the manufacturer’s instructions
Parts in contact in the pumping case Check the design pressure coincides with the operating pressure
Worn out rotors Replace rotors
FAILURE: GPVL JUST STARTING BLOCK
POSSIBLE CAUSES: REMEDIES:
Excessive medium viscosity decrease the speed of the pump, increase the temperature of the medium
Low media temperature increase the temperature of the medium, heat the pumping case (within the limits given by the manufacturer)
Excessive back-pressure
Remove possible obstructions in the outlet piping, increase the piping diameter, reduce its lenght and the number of the
bends
Worn out or untimed gears replace the gears or time them according to the instructions
Parts in contact in the pumping case Check the design pressure coincides with the operating pressure
FAILURE: UNPRIMED OF THE PUMP
POSSIBLE CAUSES: REMEDIES:
Insuffi cient N.P.S.H (Net Positive Suction Head)
Increase the head, the piping inlet diameter, reduce the suction piping lenght and the number of the bends, decrea-
se the speed of the pump and the temperature of the medium, check that the increase (caused by the decreasing
temperature) is suitable to the motor power
Medium evaporates in inlet
Increase the head, the piping inlet diameter, reduce the suction piping lenght and the number of the bends, decrea-
se the speed of the pump and the temperature of the medium, check that the increase (caused by the decreasing
temperature) is suitable to the motor power
Air enters in inlet Check and tighten suction piping connections, tighten the packing glands and, if necessary, replace them
Presence of air in the suction Fill pumping case and feeding piping with liquid, expelling air
Not enough liquid level in the tank in the suction Increase medium level, lower suction opening position
Dirty or blocked valve or suction fi lter Clean fi lters
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