High-head commercial water systems can evaluate the Armstrong Series 4030 4 x 3 x 10 horizontal base-mounted pump with a 50 HP three-phase motor and 3,500 RPM operating speed. Its split-coupled arrangement, self-venting back pull-out volute, steel C-channel base, and 175 psi standard pressure rating support industrial and high-rise chilled-water planning.

The optional 250 psi pressure configuration must be distinguished from the standard 175 psi rating during specification review. Stainless steel or bronze shaft-sleeve construction, coupling access, foundation requirements, and alignment clearance affect installation planning, while actual flow, head, NPSH, seal design, and efficiency require the selected pump curve.

Key Features

- The 50 HP motor establishes the listed power class for electrical coordination and equipment-room planning.
- Three-phase operation identifies the required motor phase for compatible starters and protection.
- Operating at 3,500 RPM provides the stated speed reference for hydraulic curve selection.
- The 4 x 3 x 10 pump size establishes suction, discharge, and casing dimensions.
- Split-coupled construction supports service access while retaining a separate pump and motor arrangement.
- The self-venting back pull-out volute supports service planning without treating the pump as close-coupled.
- Standard 175 psi and optional 250 psi ratings require project-specific pressure selection.

Hydraulic Performance and Application

Industrial fluid processing and high-rise chilled-water plants are the listed applications for this Series 4030 configuration. Exact flow, head, NPSH, efficiency, and performance-curve values are not supplied, so the 3,500 RPM speed and 50 HP rating cannot establish a guaranteed operating point.

Installation Requirements

Confirm 4 x 3 x 10 casing dimensions, three-phase electrical requirements, foundation strength, base anchoring, coupling alignment, shaft-sleeve selection, rotation, pressure rating, and service clearance before commissioning. The split-coupled arrangement requires mechanical alignment between the pump and motor after installation.

Warranty and Maintenance

Armstrong provides a 12-Month Limited Warranty from installation, with a maximum limit of 18 months from shipment, covering material and workmanship defects under normal use and service. Improper installation, maintenance, misuse, alteration, negligence, abnormal additives, and normal wear are excluded. Coupling alignment and mechanical-seal inspection remain important service checks. Mulmotor provides product-information support before purchase.