Allweiler POSITIVE DISPLACEMENT PUMP 2YZ7 MODEL USNH1300ER46 6" FLANGED ENDS 660 GPM @ 400 PSI

Allweiler POSITIVE DISPLACEMENT PUMP

2YZ7

MODEL USNH1300ER46

6" FLANGED ENDS 660 GPM @ 400 PSI

The Allweiler USNH1300ER46 (often referred to within the broader SNH / SMH series framework) is a heavy-duty, self-priming three-screw positive displacement pump manufactured by CIRCOR Allweiler It is primarily engineered for marine, offshore, power generation, and industrial applications involving the high-volume transfer of lubricating liquids

Key Technical Specifications

The exact model breakdown represents a high-capacity unit designed for reliable fluid circulation: [1, 2]

• Flow Rate: Delivers up to 660 Gallons Per Minute (GPM) / ~2,500 liters per minute at nominal speeds.
• Maximum Pressure: Rated up to 400 PSI (approx. 27–28 bar working pressure boundary).
• Temperature Range: Operates cleanly between 176°F and 392°F (80°C to 200°C).
• Operating Speed: Typically paired with industrial motor configurations running up to 1,175 RPM or similar 4/6 pole drive limits.
• Connections: Standardized 1-Inlet and 1-Outlet flanged connections. [1, 2]

Model Code Breakdown

• U / SNH / SMH: Denotes the specific installation casing style, internal bearing arrangements, and series footprint. "SNH" models typically feature a horizontal foot-mounted or flange-mounted configuration with an internal fluid-lubricated bearing. [1, 2, 3]
• 1300: Represents the size or displacement capacity frame of the rotor/stator screw assembly. [1, 2]
• E: Indicates the design stage or specific modification profile of the internal housing.
• R46: Indicates a right-handed (clockwise) rotation configuration coupled with a specific pitch angle layout for optimal hydraulic flow rates. [1, 2]

Core Applications & Fluid Handling

The pump features a pulse-free, low-noise design where the main driving screw hydraulically turns two secondary idler sealing screws. This prevents metal-to-metal contact and minimizes long-term wear. [1, 2, 3]

• Marine & Offshore: Perfect for forced heavy lube-oil circulation, cargo pumping, main engine lubrication, and seal oil systems.
• Power Plants & Engineering: Used in fuel oil injection, transfer lines, high-pressure hydraulics, and oil-firing systems.
• Compatible Fluids: Built for chemically neutral, lubricating fluids including marine diesel, heavy fuel oils (HFO), lube oils, hydraulic fluids, synthetic resins, and vegetable oils. [1, 2, 3, 4]