Armstrong, Motor Mounted, Horizontal End Suction Pump, Series 4280Motor mounted version of the horizontal end suction pump, with flanged connections. Radially-split volute with center-line discharge. Motor features heavy duty, grease-lubricated ball bearings. Supplied with self-lubricating mechanical seal and bronze balanced cast impeller designed for smooth performance and long life. Available in bronze fitted, all bronze and all iron construction.

Armstrong, Motor Mounted, Horizontal End Suction Pump, Series 4280

Design Features

  • Easy maintenance due to back pull-out design

  • Extensive interchangeability of parts

  • Manufactured and inspected to rigid standards

  • Quiet operation

  • Self venting center-line discharge

  • Confined casing gasket

  • Drilled and tapped gauge connections are standard on suction and discharge ports

  • Mount with motor feet only, or motor and pump feet for convenience

Typical Specifications

  • Provide Armstrong single stage, single end suction, motor mounted centrifugal pumps, with rising head characteristics to pump shut off. Refer to the schedule for pump flows and heads and motor speed, efficiency, enclosure and power requirements.

  • The pumps shall be Armstrong Series 4280 motor mounted horizontal end suction pump.

  • Pump Construction:
    1) Pump casing shall be cast iron, suitable for 175 psig working pressure at 140°F. (Ductile Iron for pressures to 250 psig). The casing shall be hydrostatically tested to 150% maximum working pressure. The casing shall be radially split to allow removal of the rotating element without disturbing the pipe connections.The casing shall be equipped with a drilled and tapped drain connection. Suction and discharge connections shall be provided with drilled and tapped pressure gauge connections.
    2)Pump impeller shall be fully enclosed type. Dynamically balanced.
    3) Provide a shaft sleeve, extending the full length of the mechanical seal area.
    4) Mechanical Seal shall be single spring inside type with carbon face rotating against an O-ring mounted Ni-Resist seat. EPDM elastomer with stainless steel spring and hardware shall be provided.

  • Motor power requirements shown on the pump schedule are the minimum acceptable and have been sized for continuous operation without exceeding the full load nameplate rating over the entire pump curve, exclusive of service factor.

Series 4280 Product Information
Series 4280 I&O Instructions


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