Pump Shaft Sleeves

 Pump Shaft Sleeves

A shaft sleeve is a cylindrical hollow metal tube placed over the shaft to protect as it passes through the packing. Pump shafts are often protected from erosion, corrosion, and wear at leakage joints, seal chambers, internal bearings and in the waterways by renewable sleeves. The most common shaft sleeve function is that of protecting the shaft from packing wear at the stuffing box. A shaft sleeve used between two multistage pump impellers in conjunction with the inter-stage bushing to form an inter-stage leakage joint is called an inter-stage or distance sleeve.

These are used in single stage pumps. Impeller and sealing gland are not directly  mounted on  shaft.  A  sleeve  is  fitted  between  the  bore  of  the impeller and OD of the shaft and keyed with the shaft i.e. impeller rotate with the sleeve along with the shaft. The wearable part in this type of assembly is the  sleeve,  which  is  far  less  expensive  than  the  shaft.  The  function  of  the impeller sleeves is to protect the shaft from wear and coming in contact with the pumping fluid.

Pump shaft sleeve

Pump shaft sleeve

Pump shafts are usually protected from erosion, corrosion, and wear at seal  chambers,  leakage  joints,  internal  bearings,  and  in  the  waterways  by renewable  sleeves. The  most  common  shaft  sleeve  function  is  that  of protecting the shaft from wear at packing and mechanical seals. Shaft sleeves serving other functions are given specific names to indicate their purpose. For example,  a  shaft  sleeve  used  between  two  multistage  pump impellers  in  conjunction  with  the  interstage  bushing  to  form  an  interstage leakage joint is called an interstage.

In medium-size centrifugal  pumps  with  two  external  bearings  on opposite  sides  of  the  casing  (the  common  double-suction  and  multistage varieties), the favoured shaft sleeve construction uses an external shaft nut to hold the sleeve in an axial position against the impeller hub.Sleeve  rotation  is  prevented  by  a  key,  usually  an  extension  of  the impeller key. The axial thrust of the impeller is transmitted through the sleeve to the external shaft nut.In larger high-head pumps, a high axial load on the sleeve  is  possible  and  a  design  similar  to  that  shown  in  Figure  1  may  be preferred. This design has the advantages of simplicity and ease of assembly and maintenance.  It also provides space for a large seal chamber and cartridge-type mechanical seals. When shaft sleeve nuts are used to retain the sleeves and impellers axially, they are usually manufactured with right- and left-hand threads.  The friction  of the  pumpage and  inadvertent contact  with stationary parts or bushings will tend to tighten the nuts against the sleeve and impeller  hub  (rather  than  loosen  them).  Usually,  the  shaft  sleeves  utilize extended impeller keys to prevent rotation.

Some manufacturers favour the sleeve, in which the impeller end of the sleeve  is  threaded  and  screwed  to  a  matching  thread  on  the  shaft.  A  key cannot be used with this type of sleeve, and right- and left-hand threads are substituted so that the frictional grip of the packing on the sleeve will tighten it against the impeller hub. As a safety precaution, the external shaft nuts and the sleeve itself use set screws for a locking device. In pumps with overhung impellers,  various  types  of  sleeves  are  used.  Most  pumps  use  mechanical seals,  and  the  shaft  sleeve  is  usually  a  part  of  the  mechanical  seal  package supplied by the seal manufacturer.

Many  mechanical  seals  are  of  the  cartridge  design,  which  is  set  and may be bench-tested for leakage prior to installation in the pump.

For  overhung  impeller  pumps  that  utilize  packing  for  sealing,  the packing  sleeves  generally  extend  from  the  impeller  hub  through  the  seal chambers (or stuffing boxes) to protect the pump shaft from wear. If  a  hook-type sleeve is  used,  the  hook  part  of  the sleeve is  clamped between the impeller and a shaft shoulder to maintain the axial position of the sleeve.

A hook-type sleeve used to be popular for overhung impeller pumps that operate at high temperatures because it is clamped at the impeller end and the rest of the sleeve is free to expand axially with temperature changes. But with  the  increased  use  of  cartridge-type  mechanical  seals,  the  use  of  hooktype sleeves is diminishing.

In  designs  with  a  metal-to-metal  joint  between  the  sleeve  and  the impeller hub or shaft nut, a sealing device is required between the sleeve and the  shaft  to  prevent  leakage.  Pumped  liquid  can  leak  into  the  clearance between the shaft and the sleeve when operating under a positive suction head and air can leak into the pump when operating under a negative suction head. This seal can be accomplished by means of an O-ring, or a flat gasket. For high temperature services, the sealing device must be either acceptable for the temperature to which it will be exposed, or it must be located outside the high temperature liquid environment. According to an alternative design used for some high-temperature  process pumps, the  contact surface of the  hook-type sleeve and the shaft is ground at a 45-degree angle to form a metal-to-metal seal.  That  end  of  the  sleeve  is  locked,  but  the  other  is  free  to  expand  with temperature  changes. When  O-rings  are  used,  any  sealing  surfaces  must  be properly finished to ensure a positive seal is achieved.

All bores and changes in diameter over which O-rings must be passed should be properly radiused and chamfered to protect against damage during assembly. Guidelines for assembly dimensions and surface finish criteria are always listed in O-ring manufacturers’ catalogs.

At Global Pumps & Spares, we keep a full range of shaft sleeves in ready stock.
Shaft Sleeves are available for Kirloskar Pumps, KSB Pumps, Beacon Pumps, Mather Platt (Wilo) Pumps, etc
Shaft Sleeve M.O.C. –  EN8, EN19, C.I, S.S 410, S.S 304, S.S 316, Bronze etc.
Manufactured from best quality raw materials, the Pump Shaft Sleeves are available in different grades and sizes as per the needs of our esteemed customers.
More details at http://www.globalpumps.in/shaft-sleeves.html



Ref:  share.pdfonline. com/28e0ed0290b f4decb032241d4b333b67/ PROJECT FINAL.pdf

Pump Impellers

 Pump Impeller

This is the main rotating parts of the pump that imparts the centrifugal acceleration  to  the  fluid.  Impellers  may  be  classified  in  many  ways.  For example:  According  to  the  direction  of liquid  flow  in  reference  to  the  axis  of
rotation of the shaft:

pump impeller

pump impeller


Types of Pump Impellers

i) Axial flow

ii) Radial flow

iii) Mixed flow

According on suction type

i) Single suction

ii) Double suction

According to mechanical construction of vanes

i) Closed vane type

ii) Open vane type

iii) Semi open type.

An impeller in a pump is the part that the motor spins and  that actually does the work of moving the water. Due to it’s design when the impeller spins it creates a vacuum that pulls the water or liquid in the middle of an opening on the front of the impeller (suction side)  and throws it to the outside through the discharge where it is then channeled to the output of the pump.

The impeller is the fan like disc that actually propels the liquid in the pump chamber.

Impeller makes the flow to acquire speed and velocity  in a centrifugal pump. The purpose of pump is increasing the pressure of the water.

A centrifugal pump  has an intake that allows liquid to enter the pump. Inside of the intake apparatus is a disc with fins which is attached to a motor . The propeller turns at a high speed and gives the ability to pump more water.

Impellers of pumps are classified based on the number of points that the liquid can enter the impeller and also on the amount of webbing between the impeller blades.

Impellers can be either single suction or double-suction.  In a single-suction impeller ,liquid enters the center of the blades from only one direction. In a double-suction impeller, liquid enters the center of the impeller blades from both sides at he same time.

Impellers can be open, semi-open, or enclosed. The open impeller consists only of blades attached to a hub. The semi-open impeller is constructed with a circular plate  attached to one side of the blades. The enclosed impeller has circular plates attached to both sides of the blades.

The impeller sometimes contains balancing holes that connect the space around the hub to the suction side of the impeller. The balancing holes have a total cross-sectional area that is considerably greater than the cross-sectional area of the annular space between the wearing ring and the hub. The result is suction pressure on both sides of the impeller hub, which maintains a hydraulic balance of axial thrust.

Impellers are selected on the basis of the pump design requires and the application of the pump.

Generally speaking, the higher the number of vanes in the impeller,  the greater is the efficiency of the impeller. The performance curve of a pump is also affected by the number of vanes.

The brake horsepower varies as a cube of the impeller diameter.

At Global Pumps & Spares, we keep a full range of Impellers  in ready stock.
Impellers  are available for Kirloskar Pumps, KSB Pumps, Beacon Pumps, Mather Platt (Wilo) Pumps, etc
Impeller  M.O.C. –  EN8, EN19, C.I, S.S 410, S.S 304, S.S 316, Bronze etc.
Manufactured from best quality raw materials, the Pump Impeller  are available in different grades and sizes as per the needs of our esteemed customers.
More details at http://www.globalpumps.in/impellers.html

Availability of Kirloskar Pump spare parts

Pumps are a very important part of a factory’s operations.

Breakdown of a pump can lead to serious problems in operations, including complete stoppage of the factory.

Due to this pump repairing has to be done quickly and efficiently. To repair a pump, availability of spare parts is very crucial. Without all required spare parts, the pump cannot come into operation again. Even if a single spare part is not available, the whole pump becomes unusable.

We offer all types of spare parts for Kirloskar centrifugal pumps. The most important spare parts in a pump are impeller, shaft, shaft sleeve, bearing housing, casing cover, oil seal, mechanical seal, etc.

We have ready stock of Kirloskar pump spare parts. Spare parts for Kirloskar pumps are available in various material of construction (MOC) like Cast Iron (CI), Stainless Steel (SS) , Bronze, CF8M etc. Within these MOCs various grades are available like SS410 , SS316 etc

Kirloskar pump spares

Kirloskar pump spares


Distributors of Kirloskar pumps are an essential part in the supply chain. Distributers of Kirloskar pumps should ensure availablity of materials as factories rely on them.

Details of spare parts that are available for Kirloskar pumps are available at the webpage http://www.globalpumps.in/kirloskar.html