GNA5-1-1 / 4

Burks Series GNA5-1-1/4 Base Mounted Centrifugal Pumps are available in 1750 RPM, with capacities to 1100 GPM, heads to 95 feet; and in 3500 RPM with capacities to 950 GPM, heads to 380 feet. The base mounted pump models are rated for use on inlet pressure to 100 PSI and in case working pressures to 200 PSI, with suction sizes from 1 ½" to 5", and discharge sizes from 1 ¼" to 4".

Burks GNA5-1-1/4 Series Frame-Mounted Centrifugal Pumps

Heavy-Duty Performance with Simplified Maintenance

The Burks GNA5-1-1/4 Series frame-mounted centrifugal pumps are designed for commercial, industrial, and municipal applications requiring dependable performance, easy serviceability, and long operating life. Featuring a rugged frame-mounted design and proven Burks hydraulic engineering, this series delivers reliable flow for water circulation, pressure boosting, liquid transfer, cooling systems, and process water applications.

Engineered for continuous-duty service, the GNA5-1-1/4 Series combines efficient hydraulic performance with robust construction, making it an ideal solution for facilities that demand long-term reliability and minimal downtime.

Key Features

• Frame-mounted end suction centrifugal pump design

• Heavy-duty power frame for extended bearing life

• Back pull-out construction allows servicing without disturbing piping

• Radial split casing provides strength and simplified maintenance

• Enclosed bronze impeller for high hydraulic efficiency

• Self-adjusting mechanical shaft seal for dependable sealing performance

• Replaceable casing wear ring helps extend pump life

• Stainless steel shaft for corrosion resistance and durability

• Centerline discharge helps reduce piping strain

• Factory tested for dependable performance and quality assurance

• Available in bronze-fitted, all-bronze, and all-iron construction options

Performance and Connection Sizes

The GNA5-1-1/4 Series is designed for medium-capacity pumping applications where reliability and serviceability are essential.

Performance Highlights

• Capacities up to 110 GPM

• Heads up to 95 feet at 1750 RPM

• Heads up to 380 feet at 3500 RPM

• Horsepower ranges from 1 HP to 10 HP

• 1-1/2" suction connection

• 1-1/4" discharge connection

• Maximum liquid temperatures up to 225°F with standard seals

• Inlet pressures up to 100 PSI

• Casing working pressures up to 200 PSI

• Available in 1750 RPM and 3500 RPM configurations

• Designed for continuous-duty operation

The 1-1/2-inch suction connection provides efficient flow into the pump, while the 1-1/4-inch discharge connection delivers strong pressure performance for commercial and industrial systems.

NPT Threaded and Flanged Connection Options

The GNA5-1-1/4 Series is available with connection configurations to accommodate a variety of piping systems and installation requirements.

NPT Threaded Connections

NPT-threaded models offer a practical and cost-effective solution for facilities seeking simple installation and maintenance.

Benefits of NPT Connections

• Lower installation costs

• Simplified piping modifications

• Compact footprint

• Easy pump replacement

• Ideal for commercial and OEM applications

• Reduced installation complexity

Flanged Connections

Flanged configurations are preferred in larger piping systems where secure connections and ease of maintenance are priorities.

Benefits of Flanged Connections

• Improved piping support and alignment

• Easier pump removal during maintenance

• Enhanced reliability in demanding applications

• Ideal for industrial and institutional installations

• Simplifies long-term servicing

Built for Easy Maintenance

One of the key advantages of the GNA5-1-1/4 Series is its frame-mounted back pull-out design. This allows maintenance personnel to remove the rotating assembly without disconnecting piping or disturbing the pump casing, reducing downtime and labor costs.

The heavy-duty bearing frame provides additional support for demanding operating conditions, while the replaceable wear ring helps maintain hydraulic efficiency over time.

Optional High-Temperature Service

For applications involving hot water, hot oil, and heat transfer fluids, selected GNA5-1-1/4 models are available with a Jacketed Seal Cavity option. This specialized design helps protect the mechanical seal in elevated-temperature applications and can significantly extend seal life.

Typical Applications

• HVAC heating and cooling systems

• Chilled water circulation

• Cooling tower operation

• Boiler feed and hot water circulation

• Industrial process water systems

• Water transfer and distribution

• Pressure boosting systems

• Manufacturing facilities

• Municipal water applications

• Commercial building services

Why Choose the Burks GNA5-1-1/4 Series?

The Burks GNA5-1-1/4 Series combines the durability of a frame-mounted design with the efficiency and performance expected from Burks centrifugal pumps. With flow rates up to 110 GPM, horsepower options up to 10 HP, and a maintenance-friendly back pull-out construction, this series delivers reliable operation, simplified servicing, and long-term value for demanding commercial and industrial pumping applications.