Description

Bell & Gossett 1535 Series 356T 2HP Pump | Ultimate Product Guide

The Bell & Gossett 1535 Series represents a benchmark for reliability in commercial and industrial pumping applications. The model 356T is a powerful, foot-mounted, end-suction centrifugal pump designed for heavy-duty continuous operation. With a robust 2 HP, 3500 RPM, 3-phase motor and a high-capacity 5-1/4″ impeller, this pump is engineered to handle high-flow, high-head demands in HVAC, industrial transfer, and pressure boosting systems.

Its defining feature is the back-pullout design, which allows for complete servicing of the seal and rotating assembly without disturbing the motor or piping. Combined with versatile mounting options (vertical or horizontal) and bronze-fitted construction for enhanced corrosion resistance, the Bell & Gossett 1535 offers unparalleled flexibility and serviceability for demanding environments.

Detailed Technical Specifications

Performance Range (Series Capability)

• Flow Range: Up to 240 GPM

• Head Capabilities: Up to 115 ft.

• Sizes Available: 1” through 1-1/2”

• HP Range: 1/3 HP to 5 HP

B&G 1535 vs. Other Pump Types: Comparison Table

This table highlights the position of this industrial workhorse against other common pumps.

Frequently Asked Questions (FAQ)

Q1: What does “bronze-fitted” mean?
A: This indicates that key wear components like the impeller, seal ring, and sometimes the mechanical seal faces are made of bronze. This provides superior corrosion resistance compared to all-cast-iron construction, especially in water applications, extending the pump’s life.

Q2: What is the advantage of the back-pullout design?
A: This is a major service advantage. It allows a technician to disassemble the entire rotating element (impeller, shaft, seal, bearing bracket) by simply unbolting it and pulling it back from the volute. The motor stays in place, and the piping does not need to be disturbed, saving significant time and labor during maintenance.

Q3: Can this pump be used with potable water?
A: While the “bronze-fitted” construction is more corrosion-resistant, the primary pump body is still cast iron, which can rust and is not typically approved for direct potable water contact. It is best suited for closed-loop heating/chilling, industrial water, irrigation, or other non-potable applications.

Q4: Why is it foot-mounted?
A: The foot mount provides a solid, stable base for the pump and motor assembly. This is crucial for larger, more powerful motors (like this 2 HP unit) to absorb vibration, ensure proper alignment, and prevent stress on the piping connections. It is designed to be anchored to a concrete pad or base.

Q5: What does “close-coupled” mean in this context?
A: It means the pump volute and the motor are mounted directly together on a common frame (the foot mount), with the pump shaft connecting directly to the motor shaft. This eliminates the need for a separate coupling and guard and ensures perfect alignment.

Q6: Is the motor included?
A: Yes, close-coupled pumps like the 1535 series are sold as a complete unit with the motor already mounted and aligned at the factory.

Pros and Cons

Pros:

• Exceptional Serviceability: The back-pullout design makes maintenance and seal replacement faster and cheaper.

• High Performance: Capable of moving very high flow rates (GPM) against significant pressure (head).

• Robust Construction: Built with heavy-duty cast iron and corrosion-resistant bronze fittings for long life in tough environments.

• Mounting Flexibility: Can be installed vertically or horizontally to fit unique space constraints.

• Stable Operation: The foot-mounted design provides excellent vibration damping and stability for high-HP applications.

• Proven Brand: Bell & Gossett is a legendary name in commercial hydronics with a reputation for reliability.

Cons:

• Not for Potable Water: Cast iron construction makes it unsuitable for drinking water systems.

• Requires 3-Phase Power: The three-phase motor requires a commercial/industrial electrical supply, limiting its use in residential settings.

• Higher Noise & Vibration: operates at a high 3500 RPM, which is louder and produces more vibration than 1750 RPM pumps.

• Space Requirements: The foot-mounted design has a larger footprint than a simple in-line circulator.

• Higher Energy Consumption: A fixed-speed, 3500 RPM 2HP motor consumes significant energy compared to variable-speed alternatives.

Conclusion & Best Applications

The Bell & Gossett 1535 Series 356T pump is a heavyweight champion designed for reliability and ease of maintenance in the most demanding scenarios. It is the ideal choice for system designers and facility managers who value long-term serviceability over initial cost.

You should choose this pump if:

• You need a pump for industrial transfer, large HVAC systems, or pressure boosting.

• Ease of maintenance is a critical factor, and the back-pullout feature is highly valuable.

• You have a stable 3-phase power supply and a solid base (pump pad) for mounting.

• The application involves non-potable water or other fluids compatible with cast iron and bronze.

For high-flow, high-head applications where downtime is costly, the service-friendly design of the B&G 1535 pump makes it an outstanding investment.

Disclaimer: This pump requires a 3-phase power supply and is designed for professional installation. Proper grounding and electrical connections per the NEC are mandatory. Always ensure the pumped fluid is compatible with the pump’s construction materials (cast iron, bronze).