Finder - Model API 676 -RR and RRH -Twin Screw Pumps

The two rotors are machined from a single-block piece, and the intermeshing screws provide a synchronous operation thus balancing the axial hydraulic trhusts.

The screw bearing housing can either be internal or external in a wide variety of configutations according to customer requirements.

Screw motion is trasferred by a coupled timing gear located inside one of the bearing housing. This configuration prevents metal-to-metal contact and resultant wear between the pump screws and provides a synchronous yet rotation of the screws.

Mechanical seal seats are designed for compliance with API 682 standards.

As specified in API 676, the pump casing overpressure safety valve is supplied separately. However, it can be integrated and fitted onto the pump casing on request.

These pumps are used whenever a steady flow is required and are suitable for pumping both low and high viscosity fluids such as bitumen, mineral oils, hydrocarbons, fuel oils, etc.

Additionally, they are capable of pumping dirty fluids, even with some solid particles, as well as aggressive fluids such as acids and alkaline solutions provided the pump and its components are built with the appropriate materials.

By applying special constructive solutions, the RR and RRH twin-screw pumps are also suitable to convey fluids that include a moderate quantity of dissolved gases.

They function well at low suction pressure conditions and with low NPSHr curves.

They can be supplied both in vertical and horizontal configurations for onshore and offshore applications.