Admixture Peristaltic Pump Tube

Function

The tube's internal bore volume per revolution governs dosing accuracy. As the tube progressively fatigues from repeated compression cycles, its wall loses elastic recovery, internal volume per revolution drifts downward, and dosing consistency decreases — altering concrete workability, setting time, and, in the case of superplasticiser under-dosing on high-specification mixes, reducing early-age strength gain. Scheduled tube replacement before failure prevents both dosing-related quality incidents and the pump-head damage caused by internal tube failure under pressure.

Construction & quality

Tubes are extruded from natural rubber (NR) for standard PCE superplasticisers and water-reducing admixtures, EPDM for mildly oxidising or high-pH admixtures, or Viton/FKM for solvent-bearing or highly aggressive chemical formulations. Wall thickness is precision-controlled to ±0.2 mm across the full tube length to maintain volumetric accuracy. Tubes are reinforced with braided nylon or polyester where operating pressures exceed 2 bar. End fittings are moulded with compression-compatible collars for tool-free replacement within the pump head. Each tube is pressure-tested before dispatch.

When to replace

• Admixture dosing volume drifting from set-point on flow-meter or weight reconciliation check
• Surface cracking, blistering, or hardening visible on the tube exterior
• Internal tube split causing loss of pump prime or admixture bypass
• Abnormal increase in pump drive motor current indicating tube stiffening
• Admixture leakage from pump head end-plates around the tube collar