Pump guides & technical resources
Practical guides on pump selection, repair, and troubleshooting — written for chemical and process plants.
Comparison guides
3Magnetic Drive vs Mechanical Seal Pumps for Chemical Transfer
Magnetic drive pumps use a sealed magnet coupling and can transfer dangerous chemicals with zero shaft leakage. Mechanically sealed pumps transmit power directly and are simpler to maintain. Choose a magnetic drive pump for hazardous, toxic, or expensive fluids where any leak is unacceptable, and a mechanical seal pump where flow and simplicity matter more.
PTFE vs Polypropylene Chemical Pumps
PTFE pumps handle hotter, more aggressive chemicals, but cost more. Polypropylene pumps are the economical choice for moderate acids and temperatures up to roughly 80-100 C. Choose PTFE for hot or highly corrosive chemicals, and polypropylene for everyday acid and alkali transfer at normal temperatures.
Industrial Pump Repair vs Replacement: A Practical Decision Guide
Pump repair vs replacement: repair when the casing is sound, spares are available, and the cost is a fraction of replacement. Replace when the casing is corroded or cracked, the pump is obsolete, or repeated failures show the design no longer suits the duty.
Technical guides
3Pump Cavitation: Meaning, Symptoms, Causes, and Fixes
Pump cavitation is the formation and collapse of vapour bubbles inside a pump when local pressure drops below the liquid vapour pressure. It sounds like gravel passing through the pump, damages the impeller, and reduces flow. Fix it by increasing suction head, lowering liquid temperature, or reducing suction-line losses.
NPSH Explained for Chemical and Process Pumps
NPSH (net positive suction head) is the suction head available to a pump after subtracting liquid vapour pressure. NPSHa must exceed NPSHr, or the pump cavitates. Increase NPSHa by raising the liquid level, lowering the pump, or reducing suction friction losses.
Mechanical Seals in Chemical Pumps
A mechanical seal prevents leakage where the pump shaft passes through the casing, using two precision faces pressed together. Correct face material, a working flush, alignment, and no dry running are the essentials for a long seal life in chemical duty.
Repair guides
3Chemical Pump Seal Failure Troubleshooting Guide
Pump seal failure troubleshooting guide: confirm the seal material matches the chemical, check the flush is flowing and clean, verify alignment and shaft run-out, and inspect the faces for the failure signature. Fix the root cause before fitting a new seal.
Magnetic Drive Pump Dry Running: Damage and Prevention
Dry running destroys magnetic drive pumps: the internal bearings overheat and seize, and the ceramic shaft can fracture in minutes. Prevent it with suction-level protection, a dry-run sensor, and correct venting and priming before every start.
Boiler Feed Pump Low Pressure: Causes and Checks
A multistage boiler feed pump loses pressure mainly through stage wear: eroded impellers, enlarged diffuser clearances, or worn wear rings that let water bypass between stages. Check suction conditions first, then measure head against the curve before overhauling.
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