Move low-head process water with Bell & Gossett Series 1531 2-1/2BB, a 5 HP three-phase pump running at 1750 RPM. Its NEMA JM frame and 3-inch suction with 2-1/2-inch discharge fit larger secondary HVAC and process-water systems where steady bulk circulation matters. Confirm the pump curve, electrical data, impeller trim, suction conditions, and foundation requirements before placing the unit into service.

The four-pole motor drives a close-coupled pump assembly designed for secondary circulation and process-water transfer. The supplied data does not state voltage, amp draw, flow, head, impeller diameter, seal material, dimensions, or weight. Match the 2.5BB case size to the piping, verify the NEMA JM interface, and provide proper alignment and support during installation.

Key Features & Benefits

- 5 HP Motor: Supports larger secondary HVAC and process-water circulation duties.
- 1750 RPM Speed: Provides a four-pole reference for steady lower-speed pumping.
- Three-Phase Operation: Fits compatible commercial and industrial electrical systems.
- 2.5BB Case Size: Identifies the specified pump configuration for replacement comparison.
- 3-Inch Suction: Accommodates the larger inlet connection listed for bulk circulation.
- 2-1/2-Inch Discharge: Defines the outlet size for compatible process-water piping.
- NEMA JM Frame: Provides a motor-frame reference for equipment matching.
- Close-Coupled Design: Keeps the motor and pump in one compatible assembly.

Why Choose Bell & Gossett Series 1531 2-1/2BB

The 2-1/2BB configuration is aimed at larger hydronic and process-water systems that need a 5 HP motor, large inlet connection, and 1750 RPM operation.

- Build: Close-coupled construction, NEMA JM frame, and 2.5BB case size define the supplied equipment layout.
- Value: The four-pole motor and larger suction connection suit steady circulation where lower velocity is preferred.
- Audience: Intended for industrial maintenance buyers, HVAC contractors, process-water technicians, and facility engineers.

Applications & Use Cases

Use Bell & Gossett Series 1531 2-1/2BB for secondary HVAC circulation, process-water transfer, boiler distribution, and compatible large-pipe systems. The supplied data identifies 3-inch suction and 2-1/2-inch discharge connections but does not provide dimensions, weight, base measurements, or port reach. Verify lifting access, pipe support, alignment, and service clearance before installation.

Warranty & Support

- Warranty Terms Require Confirmation: Verify duration, coverage, registration, exclusions, and authorized service requirements with the seller.
- Confirm the 2.5BB case, 5 HP motor, 1750 RPM speed, NEMA JM frame, phase, and voltage before purchase.

Set the pump on a suitable base, align the coupling, verify the three-phase connection, and inspect suction piping before startup. Prime the casing, purge air, and monitor pressure, vibration, leakage, and bearing temperature during commissioning. Purchase the Bell & Gossett Series 1531 2-1/2BB 5 HP centrifugal pump through Mulmotor.com for authentic equipment, applicable warranty support, and pump assistance.