Reciprocating Pumps Introduction
machinery and any other industry which is present in the world. High pressure
is the main characters of this pump and this high pressure output are being
used in places like starting of the engine or you can say the building of
pressure in the fluids. But there are used in limited application because they
require lots of maintenance. There are several reciprocating pump pdf books available in market.
that is the reason they do not require any type of priming for their
functioning in the starting period of the pump. So let’s discuss about this
pump in much more detail.
Parts and design of the Reciprocating pump
- A piston
- Inlet and outlet valve
- Relief valve
- Piston rings
this works same like an I.C engine but there is no combustion in this but the
whole process is same as we have in the I.C engine.
Material Used in Making of the pump
form which has the stiffness and less wear and tear are used and brass can also
Working principle of the reciprocating pump
just like an I.C engine. First of all the piston has the function of providing
the suction force, so that the liquid can be lifted up or can be sucked in with
great force. After that comes the compression part which will impart the
required pressure energy to the fluids. In this part of the phase the piston has
to do a great work so that the liquid can be compressed properly and its
pressure can increase to the desired level. The inlet and the outlet valve open
at a certain pressure which is set by the manufacturer.
single acting type which means it can suck from one side and transmit to the
same side only. But we can have the double reciprocating pump too which have
the function of the giving suction and discharge simultaneously in each stroke.
This pump can be used as the compressor also but for that we have to have a
good valve arrangement which can operate with good frequency.
positive displacement pump which means that the fluid can only move in one direction
and can never reverse back. So due to this the pump is always started with the
outlet valve open otherwise the pressure will keep on building and this will
lead to rupture of the pipeline or even the pump itself. But if relief valve is
fitted then this pressure will come down.
Maintenances required on the reciprocating pump
the pressure as much as we want but since there are so many moving parts in
this pump. So the wear and tear is a lot in this pump. So there are various
maintenances which are done with this pump in order to keep it working and also
for its long life. This is the reason why these pumps are limited in use and
only used in places where there is high suction and high pressure head is
required. Sulzer pumps are very famous. Following are the maintenances which are carried on this pump:
- The piston rings which are used are always in direct contact
with the liner body and hence they wear a lot, so we have to change them time
- The valves used in this pump have to be taken care properly
as it will lead leakage if they go bad, so they have to take care off while
maintaining of the pump.
- The gland packing from where the shaft comes out of the pump
has to be taken care in order to check its leakage.
- In coupling or the cross head of the pump by which the piston
gets the liner motion also have to check for any type of misalignment and wear
Uses of reciprocating pump
are as follows:
- The lubricating pump is a reciprocating pump and it supplies
the lubrication oil to the main engine.
- The main bilge suction pump is also a reciprocating pump.
- For ballast they are sometimes used.
Advantages of Reciprocating pump
- Gives high pressure at the outlet.
- Gives high suction lift.
- Priming is not required in this pump.
- They are used for air also.
Disadvantages of Reciprocating pump
- High wear and tear, so requires a lot maintenance
- The flow is not uniform, so we have to fit a bottle at both
- The flow is very less and cannot be used for high flow
- More heavy and bulky in shape.
- The initial cost is much more in this pump.
providing us with high pressure. But as we have seen that there are lots of maintenance
which are required in this pump. So we can say these pumps are used in places
where there is a specific purpose for them to be used. So this was all about
the reciprocating pump.