Armstrong, dualArm, Vertical In-Line Pumps, Series 4302, Series 4382Armstrong’s new dualArm vertical in-line pumps incorporate two Series 4300 or 4380 pumps in a single casing. Series 4302 is designed with split spacer type couplings, so that the mechanical seals may be serviced without disturbing the pump or motor connections, and is available with outside balanced or inside seals. Series 4382 is the economical close coupled design. Each type is supplied with a swing discharge port to hydraulically separate the casings to prevent recirculation when only one pump operates. Isolation valves enable one pump to be isolated for service or removal with the second pump still operating.

Armstrong, dualArm, Vertical In-Line Pumps, Series 4302, Series 4382

Design Features

  • DESIGNED TO INCORPORATE TWO ARMSTRONG STANDARD SERIES 4300 SPLIT COUPLED VERTICAL IN-LINE PUMPS IN A SINGLE CASING. ALL EXISTING 4300 SERIES CATALOGUE INFORMATION AND PERFORMANCE CURVES MAY BE USED, OR DOUBLED IN THE CASE OF PARALLEL OPERATION, FOR THE SERIES 4302 VERTICAL IN-LINE PUMP

  • MOTOR - Industry standard, designed for in-line service.

  • MOTOR SHAFT - run-out limited to .001” TIR (Total Indicated Reading)

  • COUPLING - Axially split spacer type permits removal of seal without disturbing pump or motor.

  • SHAFT - Stainless Steel with deflection at mechanical seal limited to .002” TIR

  • MECHANICAL SEAL - Outside balanced or inside type, accessible and easily replaced.

  • SEAL PLATE - Flush connection ensures lubrication at the seal faces and positive venting of seal chamber.

  • IMPELLER - Dynamically balanced to assure smooth vibration free operation.

  • VOLUTE - Radially split, with equal suction and discharge flange sizes. Separate tapped openings for gauge, flush and drain connections.

  • GASKET - Confined casing gasket to meet stringent industrial temperature and pressure applications.

  • FLAPPER VALVE - in discharge port hydraulically isolates casings preventing recirculation when only one pump operates.

  • ISOLATION VALVES - allow one unit to be isolated and removed for service with the second unit still operating.

  • COUPLING GUARDS - fully enclose all access openings

Typical Specifications

Series 4302 Split Coupled Vertical In-Line Pump

Supply and install as shown on the plans and specifications, Armstrong Series 4302 dualArm split coupled Vertical In-Line centrifugal pumping unit. The cast casing with equal size suction and discharge flanges, having separate tapped flush line and pressure gauge connections, shall incorporate two radially split, single stage centrifugal pumps. Each pump shall have a cast bronze dynamically balanced impeller, stainless steel shaft, lower seal flush throttle bushing, outside balanced mechanical seal with stainless steel parts and Viton secondary seal and bronze gland plate with stainless steel studs and nuts. Each pump shall be fitted with a factory furnished flush line to the mechanical seal. The flush line is to be fitted with a manual air vent.

Each driving motor shall be an industry standard vertical solid shaft, squirrel cage induction type, built to NEMA standards (motor efficiency levels may be specified). The motor shall have _________ enclosure and be suitable for a _____ Hz, _____ Phase, _____ Volt power supply and shall be connected to the pump by means of a rigid split type spacer coupling that permits removal of the mechanical seal without disturbing the pump or motor connections. The inlet and outlet ports on the casing shall be at least one size larger than the single pump size, so that both units may operate in parallel with no loss of single pump efficiency. Each port shall be fitted with an isolation valve that allow the units to operate in parallel, or standby, yet may be used to isolate one pumping unit for servicing or removal, with the other pump still operating.

Flush line option: Supply in the flush line to the mechanical seal a 50 micron cartridge type filter (if the differential pressure exceeds 30 psig [2 bars], a Cyclone separator may be specified) and a sight flow indicator. The mechanical contractor shall change the filter cartridge after the system has been flushed and on a regular basis thereafter, until the building is turned over to the owner.

Series 4382 Close Coupled Vertical In-Line Pump

Supply and install as shown on the plans and specifications, Armstrong Series 4382 dualArm close coupled type Vertical In-Line centrifugal pumping unit. The cast casing with equal size suction and discharge flanges, having separate tapped flush line and pressure gauge connections, shall incorporate two radially split, single stage centrifugal pumps. Each pump shall have a cast bronze dynamically balanced impeller, bronze shaft sleeve and inside type single spring mechanical seal. Each pump shall be complete with a factory furnished flush and vent line.

Each driving motor shall be an industry standard vertical solid shaft, squirrel cage induction type, built to NEMA standards (motor efficiency levels may be specified). The motor shall have _________ enclosure and be suitable for a _____ Hz, _____ Phase, _____ Volt power supply. The inlet and outlet ports on the casing shall be at least one size larger than the single pump size, so that both units may operate in parallel with no loss of single pump efficiency. Each port shall be fitted with an isolation valve that allow the units to operate in parallel, or standby, yet may be used to isolate one pumping unit for servicing or removal, with the other pump still operating.

Series 4302 & 4382 Product Information
Series 4302 & 4382 dualArm I&O Instructions