Naismith Engineering

Naismith Engineering
149 Heidelberg Rd
Northcote VIC 3070
Tel: 03 9489 9811
Fax: 03 9482 1474

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Vertical pump adjustable couplings

A NEW series of rigid adjustable type couplings, available through Naismith Engineering and designed for easy axial adjustment of impeller clearance in vertical pump installations, has been introduced by Lovejoy.

As an addition to the Lovejoy/Sier-Bath gear coupling line, the new RA/RAHS Series offers both close-coupled and spacer styles in standard (RA) type and high-speed (RAHS) type, which is specially balanced to API 610 8th edition tolerances.

Spacer styles provide a centre section that can be removed to let the impeller lift out for maintenance without disturbing and having to re-set its vertical clearance adjustment, or demounting either the motor or pump housing.

All styles and types are available in either AISI 1045 steel or stainless steel, for broad application across water, wastewater, power generation, refinery and many other industries.

Rigid hubs with clearance-fit bores and keyways allow easy slide-on, bolt-together installation. Twelve sizes cover bore requirements ranging from 0.44" to 10.5" with square key (or to 276mm with metric key), horsepower-per-100rpm ratings up to 2,164, and thrust capacities up to 400,000lbs.

The upper (motor) hub is indexed to the motor shaft by axial keyway and hangs on a split thrust ring fitted into the shaft's circular keyway. The lower (pump) hub, indexed to the pump shaft by axial keyway, hangs from an adjusting nut turned onto the pump shaft's threaded end.

The adjusting nut has a smooth cylindrical shape matching the hubs' outside diameter, with radial holes to allow turning with a spanner wrench.

After adjustment is set, hubs and adjusting nut are locked together with axial through-bolts. Spacers engage the lower hub's through-bolts on one end and bolt separately to the upper hub on the other end.

Naismith Engineering News

Ruland unleashes stepped bore rigid couplings with keyways (7-Aug-2007)
Ruland now offers stepped bore rigid couplings with standard keyways in each bore. The couplings are two-piece style allowing for easy assembly and disassembly without moving other components. Hardware is opposing for balance, allowing for higher speeds with reduced vibration.

Beam couplings available from Naismith Engineering (16-Mar-2007)
Flexible beam couplings with high torsional rigidity are offered by Ruland Manufacturing.

Ruland introduces double wide shaft collars to its shaft collars line (30-Jan-2007)
Ruland Manufacturing Co., Inc. has expanded its line of shaft collars to include double wide versions.

Ruland shaft collars (16-Jun-2006)
SHAFT collars are widely used components in the power transmission industry. They function as mechanical stops, clamps often used on split hubs, bearing faces, and as a means for locating components on a variety of equipment.

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