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© 2016 mbh pumps (gujarat) pvt. ltd.
Self Priming Mud Pump
© 2016 mbh pumps (gujarat) pvt. ltd.
Self Priming Mud Pump
1. INTRODUCTION
MBH SP type pumps are centrifugal pumps with an added feature of self priming
mechanism. The pump casing is to be filled initially with the pumping liquid after its
installation. The design of SP type pump allows pumping out certain amount of mud,
dirt and suspended solids. These pumps are suitable for handling water and non-
Corrossive liquids ambient temperature.
Pumps when properly installed and given proper care in operation and maintenance
should operate satisfactorily for a long period.
When pump is revived some time before actual use of pump, it should be inspected
out-side in a dry place. The shaft should be rotated freely before use.
2. PRINCIPAL OF OPERATION
The self priming action of the pump works on diffusion principal. Initially the complete
pump casing is filled with the pumping liquid which is retained by its flap valve assembly.
When the pump starts, due to centrifugal action, flap assembly opens and the air from
suction branch mixes with liquid. The mixture of air and liquid which is transferred into
large casing outside the pumping chamber and air escaped through delivery branch.
De-aired liquid again diffuses with the impeller and carries off more air from suction
branch. No sooner all the air is eliminated, diffusion of the liquid stops and the pump
works as a centrifugal pump with its full efficiency.
3. OPERATION & MAINTENANCE
3.1. OPERATION PROCEDURE
Install pumpset on foundation. Operate the pump as per following instructions.
(i) Fill the pump casing with clear water/pumping liquid through the priming plug
provided on top of the body. Close the plug after filling.
(ii) Turn the lantern ring grease cup 2 to 3 turns. This should be carried out as per need.
(iii) Do not run the pump dry.
(iv) If the pump is idle for some time due to dirt/dust collected, the impeller sticks. Give
jerk at the free end of the shaft to ensure free rotation.
(v) If the pump is used to handle water containing solids and silt, it is necessary to
wash out the same with clean water, before restarting. Restarting of pump should
be done after filling clean water.
(vi) The bearings should be lubricated regularly.
3.2 WARNING:
(i) When dirty water is handled by the pump of diesel engine set the same water should
not be used for engine cooling. In such a case radiator cooling is recommended
or use air cooled diesel engine.
(ii) Use correct grade grease in grease cups. Servo Gem-2 (Indian Oil Make) or
equivalent is recommended.
3.3 MAINTENANCE TIME TABLE :
(1) DAILY CHECK
(2) PERIODICAL
(I) Priming Time
(i) Pressure gauge reading
(ii) All pipe connections
(ii) Bearing Temperature
(ii) Suction strainer (if any)
(iii) Leak through stuffing box
(iv)
Noise
and
vibration
(v)
Voltage
and
current.
Open the pump, check and clean interior parts.
(i) Remove impeller, replace of vanes are worn seriously.
(ii) Replace shaft sleeve if worn out.
(iii) Replace gland packing of worn out.
(iv) Replace worn out parts.
(v) Replace wear plates of worn out.
3.4 PUMP MAINTENANCE PROCEDURE
(A) Dismantling Procedure
a) Remove the suction and the Delivery Pipe connection. Drain the pump Remove
the grease Cups. Pipe Nipples etc. Separate the Pump from Engine/Motor and
Base Plate.
b) Remove Suction Flange and Delivery Flange. Remove Suction Cover with Flap
Valve assembly from Delivery Casing.
c) Dismantle the Driving Unit (i.e. Assemble of Stuffing Box Housing, Bearing Housing,
Shaft, Ball Bearing, Impeller etc.) by loosening the nuts from Delivery Casing.
d) Loosen Impeller Nut, Tighten the release bolts in the tapping of Impeller, and take
out the impeller. Ensure removal without damage to vanes.
e) Loosen the Gland and remove Stuffing Box, Packing Lantern Rings and washer for
Stuffing Box Packing.
f) Take out the pump Coupling by unscrewing the Grub Screw, Remove Coupling
Key, Bearing Nut and Driving End Bearing Cover.
g) Remove Shaft Sleeve, Pull the Shaft by using Press or Puller. Bearing should not
be removed by hammering.
h) Remove N.D.E. Wearing Plate from Delivery Casing by loosening Countersunk
Head Screw. Remove D. E. Side Wearing Plate from Stuffing Box Housing by
loosening Countersunk Head Screw on applicable models.
i) After dismantling all the parts, it is necessary to clean and inspect them. The following
parts are to be checked for wear and damage and are to be replaced, if necessary.
• Impeller • Pump Shaft • Ball Bearing • Gland • Lantern Rings
• Water Deflector • Wearing Plates • Stuffing Box Packing • Rubber Flap
• Keys • Shaft Sleeve • Flat Gasket for Shaft Sleeve
