New Shaft Seal Weeping Within Three Months and a Wear Mark on the Shaft? NL-PMS-6 Mechanical Seal and Axial Load Bench, Six Stations (pump performance test)

Pumps that stay perfectly dry for the first few days, then weep at the shaft seal within two or three months, and come apart with a wear mark around the shaft and a dry-running scar on the seal faces. Mechanical seal failure is rarely a material choice problem; duty eats the life instead: a short dry run, abrasive particles in the medium, axial shocks from frequent starting, or a misaligned installation — any one of them alone can wear a face pair through in tens of hours. Type testing on the line usually runs the rated point for a few hours, so whether the seal still holds after a 30-second dry run, an abrasive medium and two thousand starts is unknown before shipment; when the floor under the customer’s unit is wet, the whole batch comes back and the freight and downtime sit with the manufacturer.

What the NL-PMS-6 mechanical seal and axial load bench measures

• Six stations in parallel, each with its own water circuit and drive, individually programmed for speed, medium, abrasive loading and start-stop profile (the seal and reliability branch of a pump performance test)
• Dry-run tolerance: a set dry period followed by restored flow, logging leakage, face temperature rise and whether sealing recovers
• Frequent starting: start-stop cycles at a realistic household rate of dozens a day, with the leakage trend logged every thousand cycles
• Axial load and vibration logged together: three-axis vibration and axial displacement recorded in sync to locate the duty point where the seal is offset-loaded
• Abrasive and aerated media: set particle size and concentration to quantify face wear rate and the effectiveness of the flush arrangement
• Quantified micro-leakage: collected liquid weighed, so leakage in the 0.1mL per hour range is resolved without waiting for a drip
• Temperature rise and input power: friction signature used as an early warning of impending failure
• Barcode and batch binding, with raw data exported per unit for seal and shaft sleeve lot comparison

Applicable standards

GB/T 3216 (rotodynamic pumps – hydraulic performance acceptance tests), GB/T 5656 (centrifugal pumps – technical conditions), JB/T 4127.1 (mechanical seals – technical conditions), GB/T 29531 (measurement and evaluation of vibration in pumps) and GB/T 2828 sampling; criteria can follow the customer’s standard and the seal type.

Stations and throughput

Six stations running continuously compress a “fit it and run for a few days” verification into leakage, axial load and temperature data, so different seal and sleeve combinations can be compared in one batch. Incoming seals, pump assembly and end-of-line units can all be sampled batch by batch, stopping early weeping and field rework before shipment.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of mechanical seal and axial load benches, pump performance test and pump test bench systems for hydraulic and endurance work, level sensor life test machines, washing machine test equipment and dishwasher test equipment.

Keywords: pump test bench, pump performance test, level sensor life test, dishwasher test equipment, washing machine test equipment.