How do you rebuild a pump

Check if the suction and discharge valves are closed. … Switch off the power. … Disconnect the electrical wire. … Check if the pump has coupling bolts (beam, bellow, coupling, etc.) … If the pump is mounted vertically, … If the pump is mounted horizontally,

What is the centrifugal pump overhaul procedure?

What is the centrifugal pump overhaul procedure ? Put off breaker and remove fuse from motor starter box. Close suction and discharge valve. Remove suction and discharge pipe flange bolt & nut, coupling bolt of motor coupling. Remove pump foundation bolts & take out pump from motor.

What is the second thing to do in dismantling a centrifugal pump?

disconnect the electrical wires entering the electric motor cover.
disconnect the circuit pump.
remove the screws (1)
uncouple the pump unit (2) and o-ring (13)

What are the procedures in dismantling and assembling of centrifugal pump?

Disconnect the electrical wires entering the electric motor cover.
Disconnect the circuit pump.
Remove the screws (1)
Uncouple the pump unit (2) and o-ring (13)
Unscrew the caps (3), making sure you secure the impeller using a soft belt, so as not to damage the paddles.

How do you find the trueness of a centrifugal pump shaft?

Use a dial indicator and magnetic base. Zero the indicator on the outside diameter of the coupling hub. Slowly rotate the shaft to look for runout, and measure the amount. Then move the indicator to the shaft adjoining the coupling hub.

What is wear ring in centrifugal pump?

Wear rings are used to help increase pump efficiency and reduce metal to metal contact. Both impeller and case wear rings are commonly found in centrifugal pumps. These pumps are used in many applications to transfer energy by centrifugal force.

How do you rebuild a reciprocating pump?

Put off breaker and remove fuse from motor starter box.
Close suction and discharge valve.
Remove suction and discharge pipe flange bolt & nut, coupling bolt of motor coupling.
Remove pump foundation bolts & take out pump from motor.

Which of the following are to be checked while carrying out the overhaul of a pump?

CHECK THE CONDITION OF SLEEVE AND CHECK FOR GROOVES AND MARKINGS WHERE MECHANICAL SEAL IS FIXED. IF SLEEVE IS HAVING ALOT OF GROOVES THEN SLEEVE TO BE REPLACED. CLEAN THE IMPELLER, KEY, SHAFT AND TOP COVER. CHECK THE IMPELLER FOR CORROSION, PITTING, CAVITATION AND WEAR.

How do you isolate a centrifugal pump?

Close the discharge isolation valve.
Open the air vent valves in the casing.
Open the valve in the outside supply line until only liquid escapes from the vent valves.
Close the vent valves.
Close the outside supply line.

What is a pump overhaul?

Overhaul means your pump is returned to ‘as new’ condition. All bearings and seals are replaced as standard. The mechanical seal is inspected and, depending on condition, repaired or renewed. This typically includes changing the bushings and shafts, re-establishing register fits and restoring impeller clearances.

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What are the parts of centrifugal pump?

Impeller. An impeller is a rotor used to increase the kinetic energy of the flow.
Casing (Volute). The casing contains the liquid and acts as a pressure containment vessel that directs the liquid flow in and out of the centrifugal pump. …
Shaft (Rotor). …
Shaft sealing. …
Bearings.

What are the steps for efficient installation of centrifugal pump?

Foundation: The foundation of the centrifugal pump should be substantially hard enough in order to support the pump and rest of installed industrial unit. …
Mounting: …
Field Alignment: …
Piping: …
Wiring: …
Rotation: …
Grounding Motor: …
Priming Flooded Suction:

How do you measure a pump shaft?

On the back side of the “seal head” (the end which fits towards the “spring”), measure the inside diameter. This will determine the seal size diameter – which is either the shaft size or the sleeve size that the seal fits over.

How do you remove a stuck impeller on a pump?

By using a strap wrench, pool owners can gently loosen the impeller and make it easier to unthread. Depending on the model of the pump, the shaft may vary. Some pumps provide a slot on the end of the shaft to secure with a screwdriver. Often times, you can access the slot by removing the motor cap.

What is a type of reciprocating pump?

There are three types of mechanism defined reciprocating pumps: piston, plunger and diaphragm or bellows. Valves at each end of the volume alternately close and open to isolate the higher pressure volume from the suction on the compression stroke and the higher pressure discharge from the volume on the return stroke.

What is reciprocating positive displacement pump?

A Reciprocating Positive Displacement pump works by the repeated back-and-forth movement (strokes) of either a piston, plunger or diaphragm (Figure 1). These cycles are called reciprocation. … The volume of fluid moved by a piston pump depends on the cylinder volume; in a plunger pump it depends on the plunger size.

What is the best description of a multi stage centrifugal pump?

Multistage pumps are defined as pumps in which the fluid flows through several impellers fitted in series. The head of a single-stage centrifugal pump is largely governed by the type of impeller and the circumferential speed.

What is stuffing box in pump?

A stuffing box of a pump houses a gland that compresses the packing used to seal the pumped fluid. It prevents leakage along the shaft that passes through a hole in the pump. Stuffing box reliability is critical to the condition and performance of the whole fluid sealing program.

What is back plate in centrifugal pumps?

Back plate is the part of the pump which fits with the. bearing housing with the help of bolts.Back plate consist. of gland ring towards bearing side where mechanical seal or. gland packings are arranged in such a way that handled. fluid by the pump can be protected from leaking in.

What is sleeve in pump?

A shaft sleeve acts as a shield for the shaft assembly in pumps and compressors. A shaft sleeve is a hollow metal tube, cylindrical in shape, which is mounted over a shaft and shaft assembly to protect it in a corrosive environment. Shaft sleeves are commonly found in single stage pumps.

What is a repair sleeve?

are metallic sleeves and are used as counterface replacement for radial shaft seals. Applications. Shaft repair sleeves are pushed onto shafts to repair the worn counterface for radial shaft seals. They are a quick and cost-effective alternative to replacing or often costly reworking of the shaft.

What is a speedy sleeve?

The new generation SKF Speedi-Sleeve uses a proprietary stainless steel material and manufacturing process, resulting in an optimized seal counterface surface that minimizes wear on both sleeve and sealing lip. The proprietary material provides increased strength and excellent ductility properties of the sleeve.

How long does a centrifugal pump last?

Pump TypeAverage Life ExpectancyNon-SubmersibleJet Pumps5-15 yearsCentrifugal End Suction irrigation5-10 years

Do centrifugal pumps need back pressure?

Therefore, to control the flow of a centrifugal pump, simply set the output pressure to the point on the P-V diagram that allows the pump to deliver the desired flow rate. The output pressure of the pump is set using a back pressure regulator. Once the pressure is set, the flow rate to the process is established.

How many bearings are in a centrifugal pump?

Figure 2.1 illustrates the rolling bearings common to centrifugal pumps. The three most used ball bearing types are the single row deep groove ball bearing, double row angular contact ball bearing and universally matchable single row angular contact ball bearing.

What are the hazards in disassembling and assembling a pump?

Potential hazards include, but are not limited to, high temperature, flammable, acidic, caustic, explosive, and other risks. Pumping equipment Instruction, Operation, and Maintenance manuals clearly identify accepted methods for disassembling pumping units. These methods must be adhered to.

Why won't my shallow well pump build pressure?

The water pump may have suffered internal damage to a seal, bearing, or impeller. The motor will keep running but the pump is unable to develop normal pressures. “Damage” may include a broken impeller blade, scale or debris clogging the impeller or other pump components, or a failing pump seal or bearing.