Flumen OPTI-RZP 50 ... 80

Design

Application

• Recirculation between nitrification and denitrification in the biological wastewater treatment
• Returning return activated sludge to the activated sludge tank or for sludge treatment
• Water circulation for aquaculture (fish farming)
• Special applications

Liquid

For pumping in commercial areas of:

• Sewage containing faeces
• Return activated sludge
• Process water

Equipment/function

• Thermal motor monitoring with bimetallic strip
• 3-chamber system
• Single-stage planetary gear
• Flow housing
• Operation with variable frequency drive possible

Type key

Technical data

• Mains connection: 3~230 V, 60 Hz/3~460 V, 60 Hz
• Fluid temperature: 3 … 40 °C (37 … 104 °F)
• Submerged operating mode: S1 (continuous duty)
• IP rating: IP68 (permanently immersed)
• Insulation class: H
• Max. switching frequency: 15/h
• Max. immersion depth: 20 m (66 ft)

Materials

• Housing: EN-GJL-250 (ASTM A48 Class 35/40B)
• Seal:
  • Motor/sealing chamber: FPM (FKM)
  • Gasket/gear chamber: SiC/SiC
  • Gear chamber/pre-chamber: FPM (FKM)
  • Fluid side: SiC/SiC
• Propeller: 1.4408 (ASTM A 351)
• Flow housing: 1.4571 (AISI 316TI)

Construction

Hydraulics

Propeller made of solid material with clogging-free propeller geometry. Pump in non-clog design flow housing with guide claw and two flange claws. The guide claw ensures smooth function when lifting and lowering the recirculation pump. The flange claws can be readjusted, ensure optimum centring on the discharge pipe and stabilise the recirculation pump at high operating pressure.

Alternative version with flange connection for direct screwing to the discharge pipe.

Gear

Single-stage planetary gear with exchangeable transmission. Gear bearings have been dimensioned large to absorb resulting stirring forces and not transfer these to the motor bearing.

Motor

Surface-cooled submersible motor in three-phase current design with permanently lubricated und large-size rolling bearings. The motor winding is equipped with temperature monitoring. The motor heat is given off directly to the surrounding fluid via the motor housing. The connection cable is designed for heavy mechanical loads, sealed water pressure-tight against the fluid and is sealed longitudinally watertight. The connection cable has bare cable ends and is 10 m (33 ft) long as standard.

Seal

The system is sealed by a 3-chamber system:

• Pre-chamberThe high-volume pre-chamber has been filled with gear oil to absorb any leakage at the seal on the fluid side. A mechanical seal is used as the seal on the fluid side. A rotary shaft seal seals towards the gear chamber.
• Gear chamberThe gear chamber has been filled with gear oil to guarantee continuous lubrication of the planetary gear and the gear bearings. A mechanical seal seals towards the sealing chamber.
• Sealing chamberThe high-volume sealing chamber is filled with white oil and absorbs any leakage from the gear chamber. A rotary shaft seal seals towards the motor.

Scope of delivery

• Recirculation pump with attached flow housing and connection cable
• Installation and operating instructions

Options

• Thermal motor monitoring as temperature controller and temperature limiter
• Thermal motor monitoring with PTC sensor
• Fluid temperatures up to 60 °C (140 °F), depending on the motor type and motor capacity
• Sealing chamber monitoring
• Ex-rated in accordance with ATEX, FM and IEC-Ex
• Ceram coating for housing parts made of grey cast iron

Accessories

• Lowering device
• Auxiliary lifting device
• Cable bollard to secure the hoist cable
• Additional rope anchoring
• Fixation sets with anchor bolts