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We perform under high pressure 1 Plunger PumpBasic Theory (1/11) A reciprocating positive displacement pump is one in which a piston displaces a given.

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Presentation on theme: "We perform under high pressure 1 Plunger PumpBasic Theory (1/11) A reciprocating positive displacement pump is one in which a piston displaces a given."— Presentation transcript:

1 We perform under high pressure 1 Plunger PumpBasic Theory (1/11) A reciprocating positive displacement pump is one in which a piston displaces a given volume at each stroke. Example: A cylindrical solid (e.g. piston) has displaced its volume from the large container to the small container. Volume B (displaced fluid) is equal to the piston volume A

2 We perform under high pressure 2 Plunger PumpBasic Theory (2/11) All reciprocating pumps have a fluid handling portion commonly called:Liquid end That has displacing solid called:Plunger or piston A container to hold the liquid called:Liquid cylinder A suction valve to admit fluid from the suction pipe into the liquid cylinder. A discharge check valve to admit flow from the liquid cylinder into the discharge pipe. Packing to seal the joint between the plunger (piston) and the liquid cylinder preventing liquid leaking out of the cylinder and xxx from leaking into the cylinder

3 We perform under high pressure 3 Plunger PumpBasic Theory (3/11) Suction stroke Plunger moved up Pressure in cylinder reduced When pressure becomes less than that in the suction pipe Single acting pump Suction valves opens Liquid flows into cylinder and fills the volume being vacated by up works movement of the piston Discharge valve is closed by high pressure in the discharge pipe

4 We perform under high pressure 4 Plunger PumpBasic Theory (4/11) Discharge stroke Single acting pump Plunger moves down causes an increase in Pressure of the liquid contained thein Pressure becomes immediately higher than suction pressure Causes to close suction valve Further plunger movement further rise of liquid pressure When equal to that in discharge pipe discharge valves opens

5 We perform under high pressure 5 Plunger PumpBasic Theory (5/11) Discharge stroke Single acting pump Liquid flows into discharge pipe Volume =>equal to plunger displacement less small losses

6 We perform under high pressure 6 Plunger PumpBasic Theory (6/11) Double acting pump Two suction and two discharge valves

7 We perform under high pressure 7 Plunger PumpBasic Theory (7/11) Liquid end Crank - and throw device - Driven by motor electrical Diesel engine (Combuston engine) Drive gear internal external

8 We perform under high pressure 8 Plunger Pump Theory (8/11) This type of pump is used when: Dependability is of prime importance even when the pump is operated continuously for long periods an where the pressure is very high. Cast liquid end plunger pumps are used for low and moderate pressure Forged liquid end plunger pumps are used for high pressure

9 We perform under high pressure 9 Plunger Pump Theory (9/11) Liquid cylinder Commonly made out of forged steel Stuffing boxes and valves chambers Are usually integral with the cylinder Plunger Are made by a number of materials. Plunger must be hard and smooth as possible to reduce friction and to resist wear by the plunger - packing. Hardened chrome alloy steels and steel coated with hard metal alloy or ceramics are must commonly used.

10 We perform under high pressure 10 Plunger Pump Theory (10/11) Stuffing box Vary widely depending upon service conditions - soft square packing - solid molded rings of square - V lip or U lip Oil and grease can be integrated into a lantern between stuffing box ring to reduce friction and reduce packing and plunger wear.

11 We perform under high pressure 11 Plunger Pump Theory (11/11) Very feasible machine Can operate at any point of pressure and flow within the limitations of the particular design. The maximum speed of a particular design is primarily limited by the frequency with which the valves will open and close smoothly The pump will operate against any pressure imposed upon it by the system it by the system it is serving. Maximum pressure rating of a particular design is determinant by the strength of the liquid end.

12 We perform under high pressure 12 Thank you for your attention ! Plunger Pump Theory


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