3GC Self priming triple screw pump for oils transfer

A robust self-priming triple-screw (three-spindle) positive-displacement pump designed for reliable transfer of fuel oil and similar non-corrosive lubricating oils. The pump uses one driven screw and two hydraulically driven idler screws that mesh with the pump insert to form a series of sealed chambers. As these chambers progress from inlet to outlet they move liquid axially and deliver a continuous, low-pulsation, constant flow under pressure.

Key features and benefits

• Positive-displacement rotary design: provides steady axial flow with minimal pressure pulsation and low noise.
• Self-priming with high suction capability: suitable for suction lift applications where priming is required.
• Long service life: idler screws are hydraulically driven and operate with an oil film between mating parts, reducing mechanical friction and wear.
• Low starting torque and vibration: moving parts have low inertia, improving start/stop behavior and reducing stress on drivers and piping.
• Safety provisions: pumps sized above the mid flow range are fitted with safety valves to protect the pump, driver and piping; excess pressured oil can be returned to the suction chamber.
• Flexible installation: available in horizontal or vertical layouts for marine installations; can be driven by AC or DC motors.

Applications

• Transfer and handling of fuel oil, lubricating oils and other non-corrosive oils (no solid particles).
• Marine fuel and oil transfer systems (marine-design 3GC variant).

Performance ranges (standard capabilities)

• Flow range: 0.2 to 590 m3/h
• Maximum working pressure: up to 100 bar
• Maximum liquid temperature: up to 150 °C

Configuration notes

• Available in general design (3G), marine design (3GC) and special-design variants to suit specific applications.
• For smaller flow models (approx. 0.2 to 6.5 m3/h) the casing and insert may be manufactured as a single part; mechanical seals are used on the shaft.

If you need dimensional drawings, material options, seal choices, or electrical drive specifications for a particular duty point (flow, pressure, viscosity and temperature), request the model and operating conditions so the correct configuration can be recommended.