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Process Fundamentals Repairing Pump Leaks - Barnummech USA

Barnum Equipment Sales (BES) sells all major brand pumps and replacement parts, including but not limited to ALFA LAVAL, AMPCO, FRISTAM, and WAUKESHA. BES also provides expert service assistance and pump sizing.

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Process Fundamentals Repairing Pump Leaks - Barnummech USA

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  1. P sales@barnummech.com 800.641.1722 •barnummech.com Common Causes of CentrifugalPump Leaks Hygienic centrifugal pumps areuniversal infood&beverageandtheyvarywidely dependingontheapplicationandthe productcharacteristics.Onethingtheyhave in common is that over time they may leak. There are numerous causes of pump leaks butwiththerighttoolsandsparepartsmost leakscanberepairedbyonsitepersonnel. When dismantling a pump, do not assume that the first worn or damaged part is the onlycauseofthepumpleak.Werecommend taking the time to perform simple mainte- nance by inspecting and replacing all of the partswhicharewornordamaged. Some manufactures sell service kits, while others sell only individual parts. The parts contained in the service kit may vary from one manufacturer to another. In any case, for simplepumprepairswerecommendstocking common spare parts which can cause or con- tribute to pumpleaks. Common SpareParts Note:Someofthepartsbelowmaynot applytoyourpumptype. 1 ROATATINGSEALO-RING(S)—Theo-ring(s) should maintain a round shape and be flexible (notbrittleorstiff).Theo-ringtypicallyfailsdueto allowing the pump to run dry, or improper flush- ing after batch transfers. It is important to use a sanitary food-grade lubricant on the o-ring when replacing. 2 ROATATING SEAL —Check the seal for cracks, breaks or chips, and ensure that the seal is a consistent thickness. The rotating sealtypically fails due to allowing the pump to run dry, improper flushing after batch transfers, wear, thermal shock, or physicalabuse. 3 STATIONARY SEAL —The stationary seal may wear out over time. Check to ensure it aligns smoothly with the engagement pin on the drivecollar. 4 SPRING —The spring tension can be damaged by the product or chemicals and evenimpacted by weather. Ensure that the spring is stiff enough to holdtension. Rotating sealo-ring(s) Rotatingseal Stationaryseal Spring Casinggasket 5 CASING GASKET —Check the gasket for wear, breaks or tears. Ensure that the gasket is a consistentthickness. ©2021 Barnum MechanicalInc.

  2. P sales@barnummech.com 800.641.1722 •barnummech.com Repairing Hygienic Centrifugal PumpLeaks 4 SHAFT(S) —Check the pump and motor shafts to ensuretheyareundamagedandstraight.Astheyare coupled,itisimportanttocheckthembothtoensure they are in parallel and in angular alignment. Check the alignment when the equipment is at normal operating temperature as thermal expansion can skew themeasurements. There are other parts failures which occur less often. Nevertheless, experiencedmaintenance personnel can replace or adjust these parts too. Some repairs (such as shaft alignments) may require specializedtools. Note:Someofthepartsbelowmaynotapply to your pumptype. 5 CUP ENGAGEMENT PIN —The cupengagement pin may wear out. Ensure the pin is undamaged and the drive collar aligns completelywith thecup. Backplate and alignmentpins Impeller Impeller pinhole Shaft Cup engagementpin Volute Voluteclamp 1 BACKPLATE — For many pumps the backplate acts as the sealing surface for the rotatingseal. Check to ensure the backplate is smooth. It should not be scared, pitted, or excessively worn. 6 VOLUTE —Volutes sometimes fail because of piping bind. This can occur if process pipingis not precisely aligned and causes pressure on thevolute. 7 VOLUTE CLAMP —Ensure that the clampholds the casing tightlytogether. 2 IMPELLER —Check the impeller to ensure the blades are smooth and in alignment. Use a feeler gauge to measure the clearance gap betweenthe impeller and the backplate when inspecting or replacing. (Check the pump specs for the specific gaprecommendation.) Barnum Equipment Sales (BES) sells all majorbrandpumpsandreplacementparts, including but not limited to ALFA LAVAL, AMPCO, FRISTAM, andWAUKESHA. BES also provides expert serviceassistance and pumpsizing. Barnum Equipment Sales is a divisionof Barnum MechanicalInc. 3 IMPELLER PIN HOLE —The pin hole cansome- times get lopsided. Ensure the pin fits into the hole, engages the impeller, and does not fall out. If the hole is lopsided, the shaft must be replaced. ©2021 Barnum MechanicalInc.

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