RGS-J series Whispair gas pumps are heavy duty units for continous service featuring a proprietary design that reduces noise, pulsation, and horsepower levels over conventional gas pumps. An exclusive wrap-around plenum and Whispair jet elimininate rapid of air into the blower from the discharge area - a major problem with conventional gas pumps.

Performance Table

Design Features

CASING - The gas pump casing is of one piece close grained cast iron construction with seperate headplates. The casing is suitably ribbed to prevent distortion under the most severe operating conditions and incorporates the Roots Whispair feature for reduced pulsation, noise and horse-power levels.

IMPELLERS - The impellers are made from ductile iron with a tension strength of 60,000 PSI. They are statically and dynamically balanced by removing metal from the impeller body and operate without liquid seals or lubrication.

SHAFTS - The gas pump shafts are alloy steel forgings flange connected to the impeller body with high-tensile socket head capscrews. Labyrinth seals are machined into the shafts to minimize air leakage.

TIMING GEARS - The impellers are timed by a pair of accurately machined forged steel gears that operate in an oil bath. The wide-faced spur gears are manufactured to AGMA standards and are carburized and ground with a hardness of 58-60 Rc. On 1000J frame size units, the gears are secured to the shafts by a taper fit. Larger sizes use a taper locking device providing an easily adjustable and releasable mechanical shrink fit. No shaft-weakening keyways or locking pins are required.

BEARINGS - The impeller/shaft assemblies are supported at each end by double row squerical roller bearings designed for long life. The thrust end bearings are fixed to control the axial location of the impeller assembly in the unit. An inboard bearing is used on 1000J through 1400J frame size V-belt driven gas pumps to minimize drive shaft stresses.

LUBRICATION - The bearings and gears are lubricated by a positive pressure lubrication system completed mounted and piped on the gas pump unit. The lube system consists of an integral direct-driven oil pump, distributing piping, oil sump in the bottom of the gear housing, suction strainer, relief valve, oil pressure gauge, low oil pressure safety switch and oil cooler. Bearing life is extended by up to 50% through the use of cool, pressurized lubrication.

TESTING - Each Roots rotary blower is given a complete mechanical run and one-point flow test at full speed and pressure to ensure mechanical integrity and verify performance. The units are operated at elevated pressure rise for a minimum of one hour after temepratures have stabilized. Flow, pressure and temperature readings are logged during the test and each blower must meet suitable vibration levels in three different planes before been certified as acceptable.