Search Our Know-How in Action Case Studies

62 KHIAs found
90 Year Old Cast Iron Lake Discharge System
Date Created: 12/12/2019
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 5831ST

Belzona 5811


Problem : There was no way to replace the old bonnets, valves and pipe without bringing in a crane to take the old bonnets up 100ft to the top. The customer wou...
Belzona helps in the Restoration of an Irrigation Pipeline
Date Created: 7/3/2019
Industry: Fluid Flow (FLOW)  |  Application: TCC-Tanks and Chemical Containment Areas (TCC)  |  Products:

Belzona 1121 (Super XL-Metal)

Belzona 1982 (SuperWrap 2)

Belzona 9381 

Belzona 5821 


Problem : The internal walls of the pipeline were suffering from serve corrosion and wear over time. Outright replacement of the pipe wasn't an option as the pi...
BELZONA REPAIRS BROKEN FLANGE
Date Created: 9/18/2015
Industry: Fluid Flow (FLOW)  |  Products:

Belzona 1111 (Super Metal)

Belzona 9341 (Reinforcement Sheet)

Belzona 9411 (Release Agent)


Problem : Broken flange collar was causing material to spill out when in operation.
Belzona knows how to rebuild a diaphragm pump
Date Created: 11/16/2019
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 5831 (ST Barrier)


Problem : This 30" diaphragm pump was not performing as it should, so Belzona was asked to rebuild it. The pump was originally installed in the 1960's and has b...
Belzona Repairs and Protects Draft Tube
Date Created: 2/9/2022
Industry: Fluid Flow (FLOW)  |  Products:

Belzona 9111 (Cleaner Degreaser)

Belzona 1311 (Ceramic R-Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : Corrosion and cavitation on the draft tube caused by pressure fluctuations. 
Water Pump that the Customer Intends to Replace Comes to Life with Belzona
Date Created: 9/14/2020
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-metal)

Belzona 1321 (Ceramic S-metal)

Belzona 9111 (Cleaner - degreaser)


Problem : Abrasion caused by corrosion in the pump body as a result of long operating time
BELZONA SUPERWRAP II SEALS THROUGH CRACKS ON A 90 DEGREE FLANGE FOR A CHILLER PUMP
Date Created: 12/31/2017
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona Superwrap II


Problem : The Customer attempted to repair the cracks. However, leaks still existed after the pump was reinstalled onto the chiller return line and tested. The ...
Repair Of Cavitation Damage on Impeller
Date Created: 7/7/2020
Industry: Fluid Flow (FLOW)  |  Application: SOS-Ships and Offshore Structures (SOS)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : Due to cavitation damage of seawater, impeller has pitting damages on surface and blades causing low efficiency pumping.
No More Leaks on a Cooling Tower with Belzona
Date Created: 11/30/2018
Industry: Fluid Flow (FLOW)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1321 (Ceramic S-Metal)

Belzona 9341 (Reinforcement tape) 


Problem : This water pipe was leaking due to antibacterial agents present in the water damaging the substrate and causing corrosion pitting.
Internal refection of a centrifugal pump using Belzona
Date Created: 1/31/2019
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1311 (Ceramic R-Metal)

Belzona 1811 (Ceramic Carbide)

Belzona 1341 (Supermetalglide)


Problem : The inside of this pump was badly damaged by entrained solids as it pumps river water. The high speed of the fluid also accelerated the deterioration.
Belzona Restores a pump Impellor
Date Created: 9/21/2022
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products: Belzona 1311 (Ceramic R Metal), Belzona 1341 (SuperMetalGlide),
Problem : The impeller had suffered from significant erosion corrosion damage, leading to the need to replace.
BELZONA SAVES REFINERY $50,000
Date Created: 3/7/2008
Industry: Fluid Flow (FLOW)  |  Application: HEX-Heat Exchangers (HEX)  |  Products:

Belzona® 1111 (Super Metal)

Belzona® 1321 (Ceramic S-Metal)


Problem : Galvanic corrosion and erosion resulting in loss of thickness and gasket sealing surfaces. This allows for working fluid to bypass portions of the mu...
BELZONA EXCEEDS THE COMPETITION IN PUMPS PROTECTION
Date Created: 10/14/2011
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1321 (Ceramic S-Metal)


Problem : Erosion of coating done by a competitor
BELZONA REPAIRS PUMP CASINGS AND ADHERES TO ALL SURFACES
Date Created: 10/14/2011
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : Cavitation around the wearing ring
Belzona Rebuilds and Protects Pump Casing and Impeller
Date Created: 11/2/2012
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R Metal)

Belzona 1321 (Ceramic S Metal)


Problem : Pump casing and impeller had become damaged due to erosion-corrosion
Belzona Rebuilds and Protects Cavitated Fan Vanes
Date Created: 11/5/2012
Industry: Fluid Flow (FLOW)  |  Application: FBC-Fans, Blowers and Compressors (FBC)  |  Products:

Belzona 1311 (Ceramic R Metal)

Belzona 1321 (Ceramic S Metal)


Problem : The fan blades were suffering from the effects of cavitation damage.
Belzona Rebuilds and Protects Fans
Date Created: 11/5/2012
Industry: Fluid Flow (FLOW)  |  Application: FBC-Fans, Blowers and Compressors (FBC)  |  Products:

Belzona 1311 (Ceramic R Metal)

Belzona 1321 (Ceramic S Metal)


Problem : Belzona was required to rebuild and protect damaged fan blades
BELZONA REPAIRS POROUS GEARBOX
Date Created: 10/13/2017
Industry: Fluid Flow (FLOW)  |  Application: ENC-Engines and Casings (ENC)  |  Products:

Belzona 5892


Problem : The gearbox was found to be porous and was leaking oil. This loss of oil was hampering the proper operation of the gearbox. The exact areas which were...
BELZONA PROTECTS PUMP IMPELLER FROM CAVITATION
Date Created: 10/12/2017
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1341 (Supermetalglide)

Belzona 2141 (ACR Elastomer)


Problem : A pump impeller was found to be suffering heavily from cavitation whilst in service. Characteristic cavitation damage was found on the impeller vanes....
Heat Exchanger Repair & Coating with Belzona
Date Created: 8/9/2021
Industry: Fluid Flow (FLOW)  |  Application: HEX-Heat Exchangers (HEX)  |  Products:

Belzona 1311 (Ceramic R Metal)

Belzona 1321 (Ceramic S Metal)


Problem : Welding was ruled out due to the risk of heat distortion. A tight turnaround was required for the item.
Belzona Impeller Repair
Date Created: 8/27/2019
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 4311 (Magma CR1)

Belzona 9111 (Cleaner Degreaser)


Problem : The pump and impeller were corroded due to contact with sulfuric acid at approximately 20% concentration, caused by back feed into the system, with th...
BELZONA REPAIRS A VACUUM PUMP
Date Created: 9/23/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 9341 (Reinforcement Tape)


Problem : The outlet port had corroded to the point a hole had formed; a competitor's patch product had been applied but failed after a short time.
BELZONA SAVES WASTEWATER GRIT PUMP
Date Created: 9/15/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal) 

Belzona 1811 (Ceramic Carbide) 

Belzona 2111 (D & A Hi-Build Elastomer) 


Problem : This grit pump got extremely worn and had been rebuilt with an alternative method, which lasted only 3 months.
BELZONA RESCUES A SNOW PLOW HYDRAULIC PUMP
Date Created: 9/15/2014
Industry: Fluid Flow (FLOW)  |  Application: ENC-Engines and Casings (ENC)  |  Products:

Belzona 1111 (Super Metal)

Belzona 9341 (Reinforcement Sheet)


Problem : The pump had been repaired with brand X, fell apart after five minutes of use.
BELZONA IMPROVES PUMP EFFICIENCY
Date Created: 9/20/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1341 (Supermetalglide)


Problem : The local water utility company wanted to coat new pumps to increase efficiency and protect against erosion-corrosion.
BELZONA PROTECTS PAPER MILL FAN PUMP
Date Created: 9/21/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1391T


Problem : Pumping stock at 125˚F, with calcium carbonate added, goes through a boil out process using sodium hydroxide and phosphoric acid at 165˚F. With the we...
Hydro Power Kaplan Turbine Case Coated with Belzona
Date Created: 7/26/2021
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : The impeller shell of the Kaplan turbine at a Hydro power plant was badly damaged by cavitation and wear over several decades.
Belzona Coats 2 x Pemo Pumps
Date Created: 2/18/2020
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1321 (Ceramic S-Metal)

Belzona 1341 (Supermetalglide)

Belzona 9111 (Degreaser)

 


Problem : Due to the sand in the water, it damaged the pumps within a short time (6 months). As a result, the pumps were only giving an output pressure of 6 bar...
Belzona Repairs Cooling Water Pipe at a Steel Plant
Date Created: 11/29/2018
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 1111 (Super Metal)

Belzona 5831 (ST-Barrier)

Belzona 5811 (Immersion Grade)

Belzona 9341 (Reinforcement Tape)

Belzona 9111 (Cleaner/Degreaser)


Problem : Corrosion had caused heavy damage on cooling water pipe, therefore weakening the jacket. This may have eventually led to a through-wall defect which w...
PUMP REPAIR AND EFFICIENCY ENHANCEMENT WITH BELZONA
Date Created: 10/17/2005
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona® 1111 (Super Metal)

Belzona® 1341 (Supermetalglide)


Problem : The pump had significant corrosion.
END SUCTION PUMP REPAIRS WITH BELZONA
Date Created: 10/17/2005
Industry: Fluid Flow (FLOW)  |  Application: PDP-Positive Displacement Pumps (PDP)  |  Products:

Belzona® 1811 (Ceramic Carbide)

Belzona® 1812 (Ceramic Carbide FP)


Problem : The pumps had suffered severe erosion and significant corrosion caused by solids entrainment.
BELZONA PREVENTS EROSION-CORROSION ON PUMP
Date Created: 9/17/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1341 (Supermetalglide)


Problem : Erosion/Corrosion of the pump volute and impeller.
BELZONA PREVENTS CORROSION CAUSED BY SWEATING PIPE WORK
Date Created: 9/17/2014
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 5831 (ST-Barrier)


Problem : Corrosion on the carbon steel caused by sweating pipe work.
Belzona Helps Rebuild End Cooler Headers
Date Created: 8/1/2018
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1511 (Super HT-Metal)


Problem : Severe pitting, corrosion appeared on the covers after years of operation. The worst of the pitting was about 8mm deep
Belzona Saves Fishing Boat Cooling-Water Circulating Pump
Date Created: 1/25/2018
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : Cooling-water circulating pump, totally damaged by cavitation.
Belzona Repairs and Restores Pump
Date Created: 10/17/2017
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1341 (Supermetalglide)


Problem : Erosion and Corrosion damage
Belzona 1381 tank protection
Date Created: 7/8/2020
Industry: Fluid Flow (FLOW)  |  Application: TCC-Tanks and Chemical Containment Areas (TCC)  |  Products:

Firstly we have considered going with Belzona 1321/1331, but then this customer specified the temperature - close to 60°C, so we offered him Belzona 1381.


Problem : The problem was an abrasion from water (with salt - CaCl2, CaS04, CaOH, MgOH …) + silica sand. They missing 3,5 mm of the wall (at the bottom of the t...
PVC pipe repair
Date Created: 11/10/2020
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 1221 (ES- Metal)


Problem : To use classical kind of repair was problem (too thick wall) also new pipe bend was not available.
Pump repair with Belzona
Date Created: 10/18/2017
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R Metal)

Belzona 1391 (HT)


Problem : Corrosion and erosion from chemicals (caustification plus CaCO3 and CaO)
Cold Plate Bonding and Traditional Composite Wrap Restores Discharge Pipe
Date Created: 7/12/2017
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 1121

Belzona 1111

Belzona 5811

Belzona 9341

Belzona 9331


Problem : Years of pumping salty river water eroded this discharge pipe which feeds an irrigation ditch. The severe reduction in wall thickness resulted in nume...
BELZONA PROTECTS AUGER MIXER
Date Created: 4/6/2006
Industry: Fluid Flow (FLOW)  |  Application: SHM-Solids Handling Machinery (SHM)  |  Products: Belzona® 1811 (Ceramic Carbide)
Belzona® 1311 (Ceramic R Metal)
Belzona® 1321 (Ceramic S Metal)

Problem : Severe abrasion wears shaft and flights. Hard inserts welded on edges.
Cooling Water Spools after 5 years in service with Belzona
Date Created: 10/30/2018
Industry: Fluid Flow (FLOW)  |  Products:

Belzona 1321 (Ceraminc S-Metal)


Problem : Corrosion and erosion from the sea water going through the spools. 
CAVITATION PROTECTION FOR WATER PUMPS WITH BELZONA
Date Created: 12/22/2009
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1341N (Supermetalglide)

Belzona 2141 (ACR-Fluid Elastomer)


Problem : General erosion/corrosion damage and severe cavitation leads to reduced pump efficiency.
BELZONA REPAIRED PUMPS IN 1986 AND STILL RUNNING
Date Created: 2/3/2008
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1321 (Ceramic S-metal)

Belzona 9411 (Release Agent)


Problem : 7% sand in the main river water supply pumps wore out 3 pumps in under 7 years.
Impeller Refurbishment Completed by Belzona
Date Created: 5/14/2020
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1391T


Problem : The impeller had eroded over time and now required re-profiling and a protective coating to protect the surface from the potential erosion in the futu...
BELZONA SAVES MORE THAN 1 BILLION US DOLLARS
Date Created: 9/15/2008
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona® 1111 (Super Metal)

Belzona® 1311 (ceramic R Metal)

Belzona® 1321 (Ceramic S Metal)


Problem : Extreme erosion & corrosion of the internal body. Fifteen vanes badly eroded.
BELZONA RESTORES LIFT STATION PUMP
Date Created: 9/25/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 1321 (Ceramic S-Metal)


Problem : The suspected damaged pump was removed, disassembled and blasted to show the extent of erosion and cavitation.
Belzona Protects New Pumps with Anti-corrosion Coating with Drinking Water Safety Certificate
Date Created: 3/22/2024
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products: Belzona 5811DW2 (DW Immersion Grade)
Problem : Customer required that the internal flow surface of the new pumps be coated with a drinking water - approved coating.
Belzona Energy-saving Coatings Improve Pump Efficiency
Date Created: 3/22/2024
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products: Belzona 1341 (Supermetalglide)
Problem : The pump efficiency test of the customer's new pump found that the target value was not reached.
Belzona Provides New Pumps with Anti-corrosion Protection
Date Created: 3/22/2024
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products: Belzona 5821
Problem : The pump factory's new pumps are coated with Belzona anti-corrosion coating to provide anti-corrosion protection.
BELZONA REPAIRS AND PROTECTS ROTOR FROM EROSION-CORROSION
Date Created: 9/17/2014
Industry: Fluid Flow (FLOW)  |  Application: FBC-Fans, Blowers and Compressors (FBC)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1341 (Supermetalglide)


Problem : During the overhaul of this plant’s Nash Vacuum Pump it was determined that the components were showing extreme signs of erosion and corrosion and cou...
BELZONA PROTECTS CENTRIFUGAL PUMPS AGAINST EROSION-CORROSION
Date Created: 9/8/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1121 (Super XL-Metal)

Belzona 1341N (Supermetalglide)


Problem : The project, consisting of ten new centrifugal pumps destined for a municipal facility, was experiencing difficulties in achieving consistent performa...
BELZONA SAVES PUMP FROM REPLACEMENT
Date Created: 9/8/2014
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1341 (Supermetalglide)

Belzona 1121 (Super XL-Metal)


Problem : The pumps from one of this well-known amusement park’s water rides had badly corroded with severe loss of metal. The corrosion was so thick that the p...
BELZONA FILLS THE VACUUM
Date Created: 4/29/2019
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 4341


Problem : Due to chemical attack caused by the sulfuric acid at elevated temperatures, the pump has lost material on all components. As a result the tolerances ...
Split pump keeps it cool with Belzona
Date Created: 3/11/2019
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1812 (Ceramic Carbide FP)

Belzona 1321 (Ceramic S-Metal)


Problem : Heavy erosion caused by suspended particles in the fluid.
Graphite Heat Exchanger restored with Belzona
Date Created: 4/18/2019
Industry: Fluid Flow (FLOW)  |  Application: HEX-Heat Exchangers (HEX)  |  Products:

Belzona 1391T


Problem : The tube sheet and some of the tubes have been severely damaged due to a combination of chemical and erosive attack. The loss of material causes a red...
Galvanic Corrosion on a Flange Solved by Belzona
Date Created: 2/5/2019
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona 1161 (Super UW-Metal)

Belzona 5831 (ST-Barrier)


Problem : Dissimilar metals were used for the flange connection, leading to galvanic corrosion.
Multistage pump gets the Belzona treatment
Date Created: 8/22/2018
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona 1111 (Super Metal)

Belzona 5821


Problem : During routine maintenance some signs of mild impingement erosion and corrosion, leading a small amount of wall loss, was identified.
Underground Seawater Pipeline SuperWrapped with Belzona
Date Created: 10/30/2018
Industry: Fluid Flow (FLOW)  |  Application: VPF-Valves, Pipes and Fittings (VPF)  |  Products:

Belzona SuperWrap II

Belzona 1982

Belzona 9381

Belzona 9382


Problem : Internal corrosion of pipeline and initial stages of weld degradation has been observed.
BELZONA REPAIRS WASTEWATER PUMPS
Date Created: 8/16/2005
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona® 1341 (Supermetalglide)


Problem : Corroded diffuser, casings and impellers leading to low efficiency of the pumps.
BELZONA CASTING IMPERFECTION REPAIR
Date Created: 8/23/2005
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona® 1311 (Ceramic R-Metal)

Belzona® 1321 (Ceramic S-Metal)


Problem : Defects in casting caused holes and cracks in the pump.
BELZONA REBUILDS AND PROTECTS VANES
Date Created: 8/29/2005
Industry: Fluid Flow (FLOW)  |  Application: CEP-Centrifugal Pumps (CEP)  |  Products:

Belzona® 1311 (Ceramic R-Metal)

Belzona® 1321 (Ceramic S-Metal)


Problem : Vanes of the impellers were severly cavitated.

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