MT8 Hydra-Cell Pro Metering Pump

Seal-Less Triplex High-Pressure Metering Pump — 0.06 to 8 GPH, up to 3,500 PSI

The Wanner Hydra-Cell^® Pro MT8 is a precision metering pump with a difference. Introduced in 2016, it features a triplex pump head — three pumping chambers sharing a common inlet and outlet manifold — that delivers virtually pulseless flow while meeting API 675 performance standards for accuracy, linearity and repeatability.

Flow rates range from 0.06 to 8.0 GPH with discharge pressures to 3,500 PSIG. The seal-less design eliminates packing and dynamic seals, making the MT8 ideal for difficult, shear-sensitive or particulate-laden fluids.

Virtually Pulseless Flow

Conventional single-chamber metering pumps produce significant pulsation and often require pulsation dampeners. The MT8’s three chambers and paired check valves generate six pulses per shaft revolution. Depending on the gearbox ratio, pulse frequency ranges from approximately 1.8 to 36 pulses per second, resulting in flow that appears pulseless for most applications.

This high-frequency characteristic, combined with a patented hydraulic piston and replenishment system, satisfies API 675 requirements for steady-state accuracy, linearity and repeatability.

API 675 Performance

Yellow area = API 675 ±1% accuracy requirement; blue area = ±0.5% range; dots = actual performance

Yellow area = API 675 ±3% linearity requirement; dots = actual performance

Yellow area = API 675 repeatability standard; dots = flow rate after speed changes

Seal-Less Design Advantages

The MT8 has no leakage paths between the process fluid and the mechanical portions of the pump. Unlike plunger-style metering pumps that rely on packing (which wears and can create fugitive emissions or contamination), the diaphragm edges are simply clamped between the pump body and head. There is no dynamic seal.

• No packing to adjust or replace
• Can run dry indefinitely without damage
• Handles restricted or blocked suction without diaphragm damage
• Particulates ≤ 200 microns do not lodge in a packing interface or accelerate wear

Technical Specifications

Key Innovations

• Internal pressure relief valve
• One-piece check valve cartridge for simplified maintenance
• Dual-shaft gearbox option — one motor can drive two pumps for double flow, proportional injection of two fluids, or an installed spare

Typical Applications

• Mixing polymers for water treatment
• Dosing phosphates, ammonia and other chemicals for boiler water treatment
• Metering methanol for wastewater nitrification
• High-pressure process chromatography
• Injection of additives in the plastics industry
• Production of polyurethane foam
• Shear-sensitive fluids with suspended particles (≤ 200 microns)

Flow Control

Most customers control MT8 flow electronically with a variable-frequency drive (VFD). Response from zero to maximum RPM is typically 0.5–1.3 seconds — faster than mechanical stroke-length adjustment — and VFDs integrate easily with flow meters, pressure transducers and plant automation systems. A manual stroke-adjustment option is also available.

Additional Technical Resources

• MT8 Catalog Pages, Performance Data, Part Numbering System and IOM