Drain Discharge Capacity Testers

Name: Drain Discharge Capacity Testers
Brand: Qualitest North America
Availability: InStock
Rating: 4.84 (287 reviews)

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Geosynthetics and Geotextile Testing Equipment

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Drain Discharge Capacity Testers

Drain Discharge Capacity Testers | ISO 18325 & ASTM D4716 Longitudinal Flow Testing

A drain discharge capacity tester measures the longitudinal water flow a prefabricated vertical drain carries under constant head. Geotechnical laboratories, drainage board manufacturers, and ground improvement contractors run the test before drains go into soft clay. Published methods include ISO 18325 and ASTM D4716. Qualitest supplies both vertical and horizontal frame configurations.

The measured value, written qw, feeds directly into well resistance calculations. A drain that under-delivers on flow stretches the consolidation timeline, and the shortfall usually surfaces months into a preload program. Bench testing keeps that risk in the laboratory. Each configuration in this range targets a different level of test control.

Why Choose Qualitest for Your Drain Discharge Capacity Tester

Qualitest North America supplies testing and measurement equipment to laboratories, quality teams, and manufacturers, backed by responsive technical support and calibration service. The drain discharge capacity tester range is built for reliable, standards-driven results, so you can source confidently from a single partner. Our team helps you match the right configuration to your samples, applicable standards, and throughput, then supports you through installation and beyond.

Request a Quote

Tell us the drain product you test, the confining pressure your method calls for, and your expected specimen throughput, and we will point you to the right configuration. Contact the Qualitest team for pricing and lead times.

Applications

Discharge capacity testing supports quality control wherever band drain accelerates settlement in compressible ground.

Drainage Board Manufacturing: lot-by-lot production control on core channel geometry and filter membrane flow performance.
Soft Soil Ground Improvement: incoming verification of drains headed for embankment, reclamation, and port ground over soft clay.
Highway and Railway Subgrade Works: confirmation of the drainage performance assumed in settlement acceleration under road and rail embankments.
Land Reclamation and Marine Clay Sites: qualification of drains for long preload programs where well resistance drives the schedule.
Water Conservancy Engineering: testing of drainage strip used in dike, reservoir, and canal foundation treatment.
Third-Party Testing Laboratories: independent measurement of supplier-declared discharge capacity for tender and contract compliance.

Drain Discharge Capacity Tester Range

Three configurations cover the range from routine production QC through confined high-pressure research testing. The main differences are frame orientation, applied confining pressure, and how the test water is conditioned.

Model	Frame and Pressure	Water Conditioning	Description
QualiGTX™ DDCT V120 Automatic Vertical Drain Discharge Capacity Tester	Vertical column, automatic operation	Standard supply	Entry-level bench for routine flow measurement on 100 × 450 mm specimens. Runs on single-phase 220 V with a compact 800 × 700 mm footprint, which suits production QC labs adding drainage board testing to an existing program.
QualiGTX™ DDCT H Horizontal Drain Discharge Capacity Tester	Horizontal frame, constant pressure regulation	Integrated thermostatic tank, heating and refrigeration	Mid-range unit with a 10-inch touchscreen and rapid specimen loading. The heated and refrigerated water supply holds viscosity steady between specimens, which matters when results from different days go into the same QC record.
QualiGTX™ DDCT V Vertical Drain Discharge Capacity Tester (350 kPa)	Vertical frame, 10 to 350 kPa confining pressure	De-aeration system with dissolved oxygen analyzer, 5 °C to 100 °C thermostatic control	Research-grade instrument that loads the drain across the full working stress range while flow continues. De-aired water and onboard oxygen verification remove bubble blockage from the result, so the capacity curve against pressure reflects the drain alone.

How to Choose the Right Drain Discharge Capacity Tester

For routine production QC on drainage board: choose the DDCT V120 for a straightforward automatic flow measurement at the lowest footprint and power requirement.
For high-volume incoming inspection: choose the DDCT H, where fast specimen loading and temperature-stable water keep throughput up without sacrificing repeatability.
For capacity loss under working stress: choose the DDCT V, the only configuration that applies 10 to 350 kPa confining pressure during flow.
For research, tender testing, or ISO 18325 conformance work: choose the DDCT V, since de-aired water and dissolved oxygen verification are required where the reported number must stand up to scrutiny.
For a lab already running geosynthetics testing: match the frame orientation to your bench layout first, then confirm the pressure and water conditioning your governing method calls for.

Drain Discharge Capacity Testers | Available Products