Multiquip Submersible Centrifugal Pump | 2 HP | Cast Iron/Steel | Max 145 GPM | Max 66 ft. Head | 230V | 49.2 ft. Cord | ST3020BCUL

Heavy-Duty 3-Inch Submersible Dewatering for Demanding Applications

The Multiquip ST3020BCUL is a 3-inch submersible centrifugal pump designed for reliable water removal in construction, industrial, utility, municipal, and residential applications. With a maximum pumping capacity of 145 GPM and a maximum head of 66 feet, the ST3020BCUL provides dependable performance for moving water from standing areas, excavations, well casings, manholes, flooded rooftops, basements, and other locations requiring effective dewatering.

Built for demanding pumping environments, the ST3020BCUL features a durable cast ductile iron impeller, oil-bathed dual silicon carbide mechanical seals, internal thermal overload protection, stainless steel hardware, sealed and lubricated motor bearings, a heat-conducting steel and cast-iron motor housing, and a 49.2-foot molded power cable. Its 2 HP, 230V single-phase motor and compact 6.9-inch diameter housing provide a practical combination of pumping capacity and installation flexibility.

Product Features:

• 145 GPM Maximum Flow: Delivers up to 145 gallons per minute for efficient dewatering and water-transfer applications.
• 66-Foot Maximum Head: Provides up to 66 feet of total head for moving water through vertical discharge applications.
• 3-Inch NPT Discharge: Features a replaceable 3-inch NPT male discharge port for connection to compatible discharge hose and piping.
• 2 HP Heavy-Duty Motor: Uses a 2 HP industrial-grade electric motor designed for reliable pumping performance in demanding applications.
• Cast Ductile Iron Impeller: Uses a durable wear-resistant ductile iron impeller designed for dependable centrifugal pumping performance.
• Dual Silicon Carbide Mechanical Seals: Features an oil-bathed, corrosion-resistant dual mechanical seal system to help protect internal pump components.
• Internal Thermal Overload Protection: Built-in thermal protection helps protect the motor against overload conditions and excessive operating temperatures.
• 6.9-Inch Compact Diameter: The streamlined pump design allows the unit to fit into pipes as small as 6.9 inches in diameter.
• 49.2-Foot Power Cable: Includes a 49.2-foot molded power cord with strain-relief protection for extended electrical connection reach.
• 230V Single-Phase Operation: Operates at 230V, single-phase, 60 Hz for compatible electrical installations.

What Is a Submersible Dewatering Pump?

A submersible dewatering pump operates while submerged in the water being removed. The ST3020BCUL uses a centrifugal impeller to move water through its 3-inch discharge, making it suitable for a wide range of water-removal applications. Multiquip identifies this model for construction applications such as standing water, well casings, excavations, site drainage, and manholes, as well as industrial and residential applications.

145 GPM Flow Rate and 66-Foot Maximum Head

The ST3020BCUL maximum pumping capacity of 145 GPM and a maximum head of 66 feet. The published performance curve illustrates the relationship between flow and total head, while actual pumping performance depends on discharge elevation, hose length, fittings, pipe configuration, and other system resistance. The maximum flow and maximum head ratings should therefore not be interpreted as occurring simultaneously.

Durable Ductile Iron Impeller

The ST3020BCUL uses a cast ductile iron impeller designed for wear resistance and dependable pumping performance. It has the impeller as cast ductile iron and specifies a 3-inch suction and discharge size. The pump also incorporates a durable strainer base designed to provide passage for debris while limiting the entry of particles larger than approximately 0.2 inches (5 mm).

230V Single-Phase Electrical Operation

The ST3020BCUL operates at 230V, single-phase, 60 Hz. The current 2026 specification lists 52.2 amps of starting current and 10.5 amps of running current, with an operating speed of 3,450 ±30 RPM. The pump is equipped with a NEMA L6-20P plug and a 49.2-foot (15-meter) molded power cable with strain-relief protection.

Built-In Thermal Overload Protection

Internal thermal overload protection is standard on the ST3020BCUL and helps protect the motor from overload conditions. The ST3020BCUL features Class A motor insulation and counterclockwise rotation. Multiquip also states that the ST3020BCUL is designed with internal thermal overload protection and does not require additional electrical protection for that function.

Compact Housing for Confined Installations

The ST3020BCUL features a narrow 6.9-inch (176 mm) overall diameter and a streamlined housing designed to fit into pipes as small as 6.9 inches in diameter. It lists an overall height of 27.9 inches (708 mm) and a dry weight of 72.8 pounds (33 kg). A plated steel and polypropylene carry handle provides a practical means of handling the pump during transportation and positioning.

Minimum Pumping Level and Submergence

The ST3020BCUL has a minimum pumping level of 3 inches (75 mm) and a minimum submergence of 19 inches (482.6 mm). For proper operation, the pump should be positioned upright on a suitable platform rather than operated on its side. The platform helps prevent the pump from burrowing into soft sand or mud during operation.

Float Switch and Control Box Options

The ST3020BCUL can be used with compatible Multiquip float switches and control boxes when automatic water-level operation is required. The current documentation identifies the CB6 control box for manual, automatic, and float-switch operation and lists compatible SW1A, SW1WOPA, and SW2A float-switch configurations. The CB6 is a 230V single-phase controller and includes two SW1WOPA float switches. Float-switch and control-box installations should be configured according to Multiquip's installation requirements and applicable electrical codes.

Construction, Industrial, and Residential Applications

The ST3020BCUL is designed for a broad range of dewatering and water-transfer applications. Multiquip identifies construction uses including standing water, well casings, excavations, site drainage, and manholes; industrial applications including water supply from lakes and rivers, wastewater, quarries, flooded rooftops, and irrigation; and residential applications such as flooded basements, swimming pools, decorative waterfalls, and fountains.

Warranty

The Multiquip ST3020BCUL has a 1 Year Warranty from the date of purchase for the pump. Multiquip separately lists three-month warranty periods for hoses, float switches, and the CB6 control box. Warranty coverage remains subject to the manufacturer's current New Product Limited Warranty terms, conditions, exclusions, and applicable procedures.

Why Choose the Multiquip ST3020BCUL Submersible Pump?