Half a Millimetre of Wear-Ring Wear and the Curve Slips? NL-WRG-6 Pump Wear-Ring Clearance and Volumetric Efficiency Bench (pump performance test)

The wear ring (sealing ring) of a centrifugal or circulator pump is the precision clearance between impeller and casing. Every bit of added clearance adds internal leakage from the high-pressure side back to the suction, and the H-Q curve slides down and to the left. The process is invisible: the casing looks new, the motor current reads normal, the user only notices “the water is not what it used to be”. The line checks a wear ring with a caliper on inner and outer diameter and releases it within tolerance. How the clearance pairs up once fitted, how long it lasts in sandy water, how far the curve drops after wear — none of the three has a number, so a “performance decay” complaint ends in a whole-pump replacement.

What the NL-WRG-6 clearance and efficiency bench measures

• Six stations with regulated supply from 0 to 1.0 MPa, full performance tests on the GB/T 3216 grade-1 basis, each station an independent closed loop (the pump performance test accuracy basis applied to wear-part comparison)
• Clearance measurement: new and worn rings measured in pairs, feeler and pneumatic gauges both, a clearance-to-performance table built per model
• H-Q curve before and after: the same pump run with a new ring and a worn ring over a fifteen-point sweep, decay landing directly on the chart
• Volumetric efficiency: back-calculated from measured leakage against theoretical flow, the internal leakage share visible at a glance
• Sandy-water accelerated wear: proportioned sandy water circulated, curves re-measured per period, wear rate correlated with water quality
• Vibration and noise coupling: growing clearance lifts low-frequency vibration, captured in parallel as an indirect indicator on the pump test bench acquisition chain
• Shaft power and temperature rise: internal leakage turns into heat, casing temperature trend against wear output
• Material comparison: cast iron, bronze, sintered and coated rings on the same bench, wear-resistant selection backed by data
• Barcode binding, clearance, curves and efficiency exported per unit for ring and casing lot comparison

Applicable standards

GB/T 3216 (rotodynamic pumps – hydraulic performance acceptance tests, grades 1, 2 and 3) as the performance basis, with IEC 60335-2-41 and GB 4706.1 covering the safety side; clearance criteria, sand concentrations and wear-rate limits can follow the customer standard, sampling to GB/T 2828.

Stations and throughput

Six stations on closed-loop regulated supply align clearance measurement, performance curves and volumetric efficiency in one run, replacing “two diameters and release” with a wear-part report built on a clearance-to-performance table. Incoming rings, final pump re-tests and after-sales decay disputes share one bench, grounding an unspecific “weaker than before” complaint in millimetre-level data.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of pump wear-ring clearance and efficiency benches, pump test bench ranges, pump performance test systems, level sensor life test machines, dishwasher test equipment and washing machine test equipment.

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