Bell & Gossett Series 1531 Model 5G Pump 20 HP 1750 RPM Motor

The Bell & Gossett Series 1531 Model 5G combines a 20 HP, 1,750 RPM four-pole motor with a 13.5-inch nominal impeller, extra-large volute, and close-coupled configuration. Its 6-inch suction and 5-inch discharge connections establish important fitment references for district cooling and industrial bulk-fluid process installations.

The NEMA JM motor frame identifies a specific mounting interface for replacement planning, while the 5G case size separates this pump from smaller Series e-1531 configurations. Hydraulic selection still requires the actual flow, head, NPSH, pressure, temperature, and curve data for the intended system duty.

Key Specifications of the Bell & Gossett Series 1531 Model 5G Close-Coupled End Suction Pump

- The 20 HP motor establishes the listed power class for electrical planning and equipment replacement comparison.
- Operating at 1,750 RPM, the four-pole motor affects curve selection and rotating-equipment coordination.
- A 5G case uses 6-inch suction and 5-inch discharge connections, requiring compatible piping dimensions.
- The 13.5-inch nominal impeller identifies the supplied hydraulic configuration for curve and trim review.
- Close-coupled construction combines pump and motor in one assembly, affecting layout and service clearance.
- The NEMA JM frame provides a defined motor fitment reference for mounting and replacement evaluation.
- District cooling and industrial bulk-fluid processing are the documented application contexts for project screening.

Hydraulic Performance, Efficiency and Application

District cooling and industrial bulk-fluid processing are the listed applications for this pump. The supplied SKU information does not provide an exact flow, head, NPSH, pressure, pump curve, or efficiency value, so the 13.5-inch impeller cannot establish a guaranteed operating point.

Installation and System Requirements

Verify 6-inch suction and 5-inch discharge piping, NEMA JM motor fitment, electrical compatibility, rotation, connection alignment, and service clearance before installation. Bell & Gossett warranty coverage requires proper installation and intended use, making the applicable installation manual important during commissioning.

Warranty, Support and Maintenance

Bell & Gossett provides an 18-Month Limited Warranty from shipment or a 1-Year Limited Warranty from installation, whichever occurs first, covering defects in materials and workmanship. Misuse, alteration, negligence, improper installation, and operation contrary to instructions are excluded. Mulmotor provides product-information support before purchase and assistance with order-related questions.