pump repair options & alternatives

Pump repair options &

alternatives

Presented by Bob Gaskeyof

1

My background

• Worked in a foundry and machine shop

• 27 years in aftermarket pump industry

• Worked for a Sturm Machine distributor-traveling drafting team

• Expertise with older vintage pumps

• Expertise with pump retrofits

2

My background

• Project manager on several wastewater cso deep tunnel pump repairs

• Worked in a foundry and machine shop

• Worked for a large full service pump distributor

• Currently the Pump Repair Manager with Pumping Solutions in Blue Island, IL.

3

Course Overview

• Emphasis on large water pumps typically found in fresh water, wastewater, power, steel & general manufacturing.

• Promote awareness of options to consider when faced with the decision to repair or replace pumps.

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Goals of the course• Machining principles

• How centrifugal pumps are made

• Stabilizing your pump and motor train

• Take ownership & responsibility of your pumps

• Establishing warranty clarity

• Tracking and logging your pumps

• Application scenarios

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Why keep older pumps running?

• Capital budgets

• Piping changes

• Foundation changes

• Pumps may not be able to be taken off line

• Build quality of older pumps-mass

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Reasons for replacing pumps?

• Completely different technologies

• Efficiency/energy savings

• Manufacturer out of business

• Parts are obsolete

• Worn our beyond repair

• Duty point has changed

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Pump repair considerations

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Pump repair shop check list

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• Crane capacity

• Press configuration/capacity

• Balancing capabilities

• Horizontal/vertical lathe capacity

• Cleaning methods

• Experience of personnel

• Engineering capabilities

• Experience repairing similar pumps

Balancer capacity

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Balancer capacity

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Balancer capacity

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Balancer capacity

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Press capacity

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Horizontal lathe capacity

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Vertical lathe capacity

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Welding equipment & procedures

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Repairs-on site inspections

• Inspect shop before repair is awarded

• Inspect pump after initial disassembly & cleaning

• Inspect pump when rotor is assemble and ready for final assembly

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Repair documentation -establishing warranty clarity

• Repair documentation

• As found sizes

• As built sizes

• Shaft TIR

• Balance report

• Bearing housing sizes/concentricity

• Casting NDE report

• Metal certification

• Hardness report

• Alignment report

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Repair documentation

• Accurate reports help narrow the trouble shooting process.

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Shaft TIR

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Balance report

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Metal certification

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Alignment report

Taking pump out of standard

• Impeller bores

• Wear ring sizes

• Pump case machining

• Design upgrades

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Parts swapping in repairs

• Newer pumps lend themselves to a parts swapping philosophy.

• Older pumps that have been repaired and re-machined repeatedly do not lend themselves to a parts swapping philosophy.

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All or nothing strategy

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Evolution of pump metallurgy

• Bronze fitted pumps

• 1970’s pressure from aftermarket pump part companies.

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Rotor stabilization

• Pump, motor (or turbine) gear box

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Vibration analysis can expose:

• Multiple types of unbalance

• Eccentric rotor

• Bent shaft

• Multiple types of misalgnment

• Resonance

• Mechanical looseness

• Rotor rub

• Journal bearing issues32

• Rolling element bearing failure

• Hydraulic & aerodynamic forces

• Gear issues

• AC induction motor issues

• AC synchronous motor issues

• DC motor and control issues

33

Vibration analysis can expose:

• Belt drive issues

• Pulley issues

• Beat frequency vibration

• Soft foot, sprung foot & foot related resonance

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Vibration analysis can expose:

Seal Advantages

• Seals-less drag on shaft sleeve thus saving energy

• When applied, installed with an appropriate piping plan-housekeeping

• Run dry capabilities

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Packing Advantages

• Can help stabilize the rotor

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Pump machining principles

• Centrifugal pumps are made up of individually machined components that mate together with register fits to form one common concentric centerline.

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Pump part machining

• Faces must be flat, parallel & perpendicular

• Accurate sizes

• Most important-concentric common centerline

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