Armstrong, Split Coupled, Vertical In-Line Pumps, Series 4300Armstrong's Vertical In-Line pump is a design innovation that continues to lead the industry. Armstrong improved the efficiency and utility of commercial pumps by designing the Vertical In-Line pump in the early 1970s. Armstrong continues to play a leading role in educating engineers around the world on the value of Vertical In-Line installations, and offers a wide range of sizes and options. Armstrong Vertical In-Line pumps combine excellent operating efficiency with very low vibration. In installations all of the world, substituting vertical in-line pumps has led to significant cost savings in piping and system efficiency.

Armstrong, Split Coupled, Vertical In-Line Pumps, Series 4300

Design Features

  • Industry standard motor designed for Vertical In-Line operation

  • Heavy cylindrical bracket with 360° register on each flange provides a rigid union of pump and motor

  • Motor shaft run-out limited to 0.025 mm T.I.R. (Total Indicator Reading)

  • Axially split, spacer type rigid coupling permits seal maintenance without disturbing pump or motor. Lightweight high tensile aluminum, precision bored and designed to reduce bearing load

  • Shaft deflection at mechanical seal limited to 0.05 mm T.I.R.

  • Mechanical seal, accessible and easily replaceable (Outside multi-spring balanced mechanical seal illustrated. See page 5 for mechanical seal options)

  • Gland plate with flush connection ensures liquid at seal faces and positive venting of seal chamber

  • Dynamically balanced impeller assures smooth vibration-free operation

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

  • Liberal inlet passageways and straightening vanes provide optimum suction performance and quiet operation

  • Ribs cast integral with volute. Machined surface to accept floor support when specified

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

  • Coupling guard fully encloses access openings

Typical Specifications

  • Provide Vertical In-Line (VIL) pumps, single stage, single or double suction type, with pump characteristics which provide rising heads to shut off. Refer to pump schedule for pump flows and heads and motor speed, enclosure, efficiency and power requirements and other system conditions. Provide Armstrong Series 4300 split-coupled type VIL units, with rigid spacer type coupling.

  • Pump Construction: Pump Casing - Cast Iron with 125 psig ANSI/PN16 flanges for working pressure below 175 psig (12 bar) at 150°F (65°C) and Ductile Iron with 250 psig ANSI/PN25 flanges for working pressures to 375 psig (25 bar) at 150°F (65°C). Suction and discharge connections shall be flanged and the same size and shall be drilled and tapped for seal flush and gauge connections.

  • Impeller - Bronze, fully enclosed type. Dynamically balanced. Two-plane balancing is required where installed impeller diameter is less than 6 times the impeller width.

  • Shaft - Provide Stainless Steel pump shaft.

  • Coupling - Rigid spacer type of high tensile aluminum alloy. Coupling to be designed to be easily removed on site to reveal a space between the pump and motor shafts sufficient to remove all mechanical seal components for servicing and to be replaced without disturbing the pump or motor.

  • Mechanical Seals - Shall be Stainless Steel multi-spring outside balanced type with Viton secondary seal, carbon rotating face and silicon carbide stationary seat. Provide 316 stainless steel gland plate. Provide factory installed flush line with manual vent.

  • All split coupled pumps shall be provided with a lower seal chamber throttle bushing to ensure seals maintain positively cooling and lubrication.

  • Seal flush line accessories, if required to improve seal chamber cleanliness: Supply in the flush line to the mechanical seal a 50 micron cartridge filter and sight flow indicator, to suit the working pressure encountered.

  • Filters shall be changed, by the installing contractor, after system is flushed and on a regular basis until turned over to the owner.

  • Alternately, a maintenance-free accessory needing pump differential pressures exceeding 70 ft./30 psig/200 kPa for effective operation: Supply in the flush line to the mechanical seal a maintenance-free sediment separator, with sight flow indicator.

Series 4300 Brochure
Series 4300 I&O Instructions