Water Passage DesignMTH masters one of the most critical design considerations of regenerative turbine pumps - the shaping of water passageways to achieve maximum capacity and pressure while minimizing horsepower requirements. By optimizing water passageway cross-sectional profiles for each impeller, MTH improves both efficiency and pressure over the standards realized by other techniques.
One of the most notable improvements in regenerative turbine pump technology, incorporated in T31 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 parameters for each pump, peak efficiency is improved and “off peak” horsepower requirements are reduced as well.
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 the T31 Series 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 T31 Series. The result is a high performance pump providing efficiency characteristics exceeding those of much more expensive units.
T31 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 this gentle fluid entry into the impeller blades and account for the high inlet efficiency of the T31 Series pumps.
Pumping capacity varies only slightly as pressure changes. Steep pressure characteristic overcomes temporary line resistances.
T31 impellers utilize balancing holes to promote hydraulic self-centering and to eliminate the need for external adjustment. The impeller exerts no thrust load on the bearings, thereby extending service life. Self-centering is equally effective whether mounted in the horizontal or vertical position.
Custom manufactured D3 motors feature a 304 stainless steel shaft and heavy duty ball bearing for extended life. Single phase and three phase ODP and three phase TEFC enclosures are standard, as well as a two-pole, 50Hz/60Hz ratings, and UL and CE Marks.
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.
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.
For a copy of the T31 Manual and T31 Parts List, go to the Product Support Page.
Download a printable version of the T31 Product Bulletin in .pdf format.
Download a printable Spanish version of the T31 Product Bulletin in .pdf format.
Download the complete T31 Series Section (curves and dimensions) from the Standard Products Catalog.
