T41 • E41 Series Regenerative Turbine Pumps

Performance Curves Dimensions Design Features Optional Features Accessories

Capacities to 24 GPM
Heads to 600 Feet
Low NPSH Requirements

MTH T41 • E41 Series

Close-coupled and pedestal mounted regenerative turbine pumps represent the most economical, high performance alternative for low flow (1/2 to 22 GPM) clean fluid applications involving moderate to high pressures (heads to 600 feet).

By combining the latest concepts in hydraulic turbine pump design with precision computer controlled manufacturing, the T41/E41 Series pumps deliver high efficiency operation even at low NPSH. Costs are controlled by efficient manufacturing processes and highly optimized pump designs. Maintenance costs are kept to a minimum by combining an easily serviceable design with the use of high quality components to provide long life.

Water Passage Design

MTH masters one of the most critical design considerations for regenerative turbine pumps -- the shaping of water passageways to achieve highest capacity and pressure while minimizing horsepower requirements. By optimizing water passageway cross-sectional profiles for each impeller, MTH has improved both efficiency and pressure in the T41/E41 Series, exceeding the levels realized by previous techniques.

Impeller Profile

One of the most notable improvements in regenerative turbine pump technology incorporated in T41/E41 Series pumps involves the ability to determine the optimum impeller width and blade length. These factors have a significant effect on the required horsepower versus pressure curve for regenerative turbine pumps. By optimizing these for each T41/E41 Series pump, peak efficiency is improved and “off peak” horsepower requirements are reduced as well.

Impeller Blades

After the most favorable impeller profile has been determined for a particular water passageway cross-section, MTH calculates the number of blades needed to maximize the performance of that pump. Current blade design in T41/E41 Series pumps increases both efficiency and design pressure without the manufacturing difficulties associated with producing contoured blade impellers. State-of-the-art computer controlled machines simplify manufacturing of the various MTH impellers utilized in the T41/E41 Series. The result is a high performance pump providing efficiency characteristics exceeding those of more expensive units.

NPSH Requirements

T41/E41 Series regenerative turbine pumps meet low net positive suction head (NPSH) requirements without efficiency loss. This is achieved by keeping the inlet fluid velocity low and then gently accelerating to passageway velocities. Special ramps are responsible for an almost shockless fluid entry into the impeller blades and account for the high inlet efficiency in the T41/E41 Series pumps.

E41 Series

Similar to the T31 Series, the E41 takes advantage of our custom manufactured dual face D3 motors that incorporate a 304 stainless steel shaft and heavy-duty bearing. The stainless steel shaft eliminates the necessity of a shaft sleeve, thereby reducing the parts count and simplifying maintenance and servicing procedures. All D3 motors also feature a two-pole 50//60Hz rating, as well as CE Mark approval useful for OEM’s with worldwide customers. The three-phase versions of the D3 motors feature a compact TEFC enclosure and a range from 1/3 to 3HP. The single phase D3 motors have an ODP enclosure and a range from 1/3 to 2HP. The E41 is available in horizontal close-coupled and vertical flange mounted configurations only. Please see Design Features for more detailed information on both T41 and E41 motor options.

Horizontal Closed Coupled

The contractor shall furnish (and install as shown on the plans) an MTH T31 Series horizontal close coupled regenerative turbine type pump model _______ size 3/4 by 3/4 of (ALL BRONZE) (316 STAINLESS STEEL) construction. Each pump shall have a capacity of ____GPM when operating at a total head of _______feet. Suction pressure will be _____feet with a liquid temperature of _____°F.

The pump is to be furnished with a mechanical seal with stainless steel metal parts, _____ elastomers, ceramic seat and carbon washer.

The pump casing shall be vertically split, two piece design, end suction and (top discharge) (90° discharge) (180° discharge) (270° discharge) with water passageways in each piece. The impeller shall be hydraulically self-centering and no external adjustment shall be necessary.

The pump shall be close-coupled to a _____ HP _____ Phase _____ Hertz _____Volt _____RPM horizontal (open dripproof) (totally enclosed) motor, with 304SS shaft, 204 ball bearing and CE Mark.

The motor shall be sized to prevent overloading at the highest head condition listed in the specifications.

Vertical Flange Mount

The contractor shall furnish (and install as shown on the plans) an MTH T31 Series horizontal pedestal mount regenerative turbine type pump model_________ size 3/4 by 3/4 of (ALL BRONZE) (316 STAINLESS STEEL) construction. Each pump shall have a capacity of ____GPM when operating at a total head of _______feet. Each pump shall have the capacity of _____ GPM when operating at a total head of _____ feet. Suction pressure will be _____ feet with a liquid temperature of _____°F.

The pump is to be furnished with a mechanical seal with stainless steel metal parts, _____ elastomers, ceramic seat and carbon washer.

The pump casing shall be a vertically split two piece design, end suction and (top discharge) (90° discharge) (270° discharge) with water passageways in each piece. The impeller shall be hydraulically self-centering and no external adjustment shall be necessary.

The pump shall be mounted on a bearing pedestal with sealed, grease lubricated ball bearings having a two year minimum design life under maximum pump differential pressure of 300 PSI.

Pump and motor shall be mounted on a common steel baseplate (with cast iron drip pan). The pump is to be flexible-coupled with aluminum coupling guard to a NEMA standard _____ HP _____Phase _____Hertz _____Volt _____RPM horizontal (open dripproof) (totally enclosed) (explosion proof) motor. The motor shall be sized to prevent overloading at the highest head condition listed in the specifications. Coupling alignment shall be checked after installation.

Horizontal Pedestal Mount

The contractor shall furnish (and install as shown on the plans) an MTH E41/T41 Series vertical close coupled flange mount regenerative turbine type pump model_________ of (BRONZE FITTED) (ALL IRON) (ALL BRONZE) construction. Each pump shall have a capacity of ____GPM when operating at a total head of _______feet with a style ____ suction flange and a 1” discharge. Suction pressure will be ____feet with a liquid temperature of ____degrees F.

The pump is to be furnished with a mechanical seal with stainless steel metal parts, Buna elastomers, ceramic seat and carbon washer. A stainless steel shaft or a shaft sleeve shall be furnished in pumps up to three horsepower and a 316 stainless steel shaft in pumps five horsepower and larger.

The pump casing shall be vertically split two piece design with water passageways accurately machined into each piece. The impeller shall be hydraulically self centering and no external adjustment shall be necessary.

The pump shall be close coupled to a standard NEMA “C” face HP ___phase ___Hertz ___voltage ___RPM horizontal (OPEN DRIPPROOF) (TOTALLY ENCLOSED) (EXPLOSION PROOF) motor. The motor shall be sized to prevent overloading at the highest head condition listed in the specifications.

Close Coupled Engineering Specs Vertical Flange Mount Engineering Specs Pedestal Mount Engineering Specs

For a copy of the T41•E41 Manual and T41•E41 Parts List, go to the Product Support Page.

Download a printable version of the T41 • E41 Product Bulletin in .pdf format.

Download a printable Spanish version of the T41 • E41 Product Bulletin in .pdf format.