Gland Packing Too Tight. The shaft’s purpose is to transmit the rotational motion and power (torque) from the driver to the pump shaft components, mainly the impeller(s). Centrifugal Pump Bearings: Tips for Improving Reliability and Reducing Failure. The low hardness of both pieces indicates insufficient mechanical properties. SATURDAY This causes the shaft to flex and then fail. The guidelines below might help or at least eliminate some of the more usual problems we experience in a callout: The centrifugal pump is not primed – re-prime the pump and check that the pump and suction line is full of fluid. The new recommended heat treatment resulted in lower amount of discontinuous Cr-carbides along with significant amount of fine precipitates uniformly distributed throughout the matrix which led to an optimum combination of both hardness (59 HRC) and toughness (6.5 J) required for the application. In such cases reliable functioning of the pump is an absolute necessity. The chemical analysis, mechanical tests such as tensile, micro-hardness, and impact tests in addition to microstructural analysis such as optical microscopy and Scanning Electron Microscopy (SEM), Investigation on the premature failure of suspension coil spring of a passenger car, which failed within few months after being put into service, has been carried out. Even if a pump has been properly laser aligned at installation, it can still become misaligned during operation due to dynamic load shifts and thermal growth. Mechanical failure of critical pump parts: Check bearings and impeller for damage. Both Mechanical Seal and Magnetic Drive Centrifugal pumps can suffer from running dry if the pump hasn’t been designed to combat it. Centrifugal pump composition is relatively simple, which mainly composed of four parts: prime mover, impeller, pump shell, and shaft seal device. Counter Service Only, 3636 Belvedere Rd. Inherent material defect in association with deficient processing led to the failure of the spring. Further examinations were conducted by heat treatment simulations to explore properties after heat treatment. If approximately 25 vol % lower bainite appears in 673 K tempered martensite of the steel, a 1700 M Pa yield-stress grade steel with high toughness and moderate ductility levels can be attained. Centrifugal pumps are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow. For a mechanical seal pump, running dry could lead to pump cavitation and therefore seal damage. Most of the hydraulic equipments in Romania are operating from more than 30 years. The resonance occurred as a result of intense erosion of pump impellers derived mainly from cavitation phenomenon that caused about 20% of the impeller mass decrease. This study investigates the failure of an industrial cooling water pump which experienced a drive shaft failure. Here are the failure analyses. Vibration is typically caused by misalignment between the motor and pump shafts for long coupled centrifugal pumps. Centrifugal pump efficiencies range from 50% to 95% efficient depending on the flow rate, pressure, and pump configuration. Hanger material is ASTM A182 Grade F22 Class 1. Mechanical failure (failure of hydraulic balancing device). The analysis adjudged hardness variation in the shaft due to materials processing issues as the root cause of the failure. The most common centrifugal-pump lubrication-application system is the oil bath fed by a bottle oiler. Continuous working of the centrifugal pumps is essential in process industries such as paper mills, textile mills and refineries, for non-stop operation of the plants. Though this has happened, it’s more likely that the bearings fail before the shaft. Shafts of centrifugal pumps are both load bearing and power transmitting component which are usually composed of martensitic stainless steel. Allowing the pump to dry run can lead to catastrophic pump failure (depending on circumstance). Shaft bent due to damage - through shipment, operation, or overhaul: Dismantle pump and inspect shaft.
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