Rexa SUPRA

Design

Liquid

For pumping in commercial areas of:

• Untreated sewage
• Sewage containing faeces
• Process sewage
• Wastewater (with small amounts of sand and gravel)

Equipment/function

• Heavy-duty cast iron design.
• Sealing chamber to collect any leakage from the mechanical seal on the fluid side.
• Leakage chamber to collect any leakage from the mechanical seal on the motor side (motor dependent).
• Motor dependent monitoring devices:
  • Winding temperature with bimetallic or PTC sensor.
  • Leakage detection for sealing chamber, leakage chamber, and motor/terminal compartment.

Type key

Technical data

• Mains connection: 3~400 V, 50 Hz
• Immersed operating mode: continuous duty (S1)
• Non-immersed operating mode:
  • T motor: 15 minutes short-time duty (S2-15) or 30 minutes short-time duty (S2-30)
  • FK/FKT/HC motor: continuous duty (S1)
• IP rateing: IP68 (permanently immersed)
• Insulation class: H
• Fluid temperature: 3 … 40 °C (37 … 104 °F)
• Max. immersion depth: 20 m (66 ft)

Materials

• Hydraulic housing: EN-GJL-250 (ASTM A48 Class 35/40B) or EN-GJS-500-7 (ASTM A536 70-50-05)
• Impeller:EN-GJL-250 (ASTM A48 Class 35/40B) or EN-GJS-500-7 (ASTM A536 70-50-05)
• Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B) or EN-GJS-500-7 (ASTM A536 70-50-05)
• Seals:
  • Static: Nitrile (NBR)
  • On the fluid side: SiC/SiC
  • On motor side: SiC/SiC or C/Cr
• Shaft: Stainless steel 1.4021 (AISI 420)

Construction

Hydraulics

Discharge port with a horizontal flange connection. The maximum dry solids content is 8 % for vortex, single-channel, and two-channel impellers. For three-channel and four-channel impellers is the maximum dry solids content is 5 %. The follow impeller types are available:

• Vortex impeller
• Single-channel impeller
• Multi-channel impeller

T motor

Surface-cooled submersible motor without cooling system for wet installation. The housing parts transmit the waste heat of the motor directly to the fluid. The motor itself is dry. Permanently lubricated rolling bearings are used for the motor bearings. The power cable is longitudinally watertight and has bare cable ends. Depending on the motor size and the motor power, the motors can be installed dry and operate in short-time duty.

FK motor

Self-cooling submersible motor with active cooling system for wet and dry installation. The cooling system is filled with white medical grade oil and is unpressurised. An impeller on the motor shaft continuously circulates the coolant. The cooling flange transmits the waste heat to the pumped fluid. Permanently lubricated roller bearings are used for the motor bearings. The power cable is longitudinally watertight and has bare cable ends.

FKT motor

Self-cooling submersible motor with active cooling system for wet and dry installation. The cooling system is designed with a closed cooling circuit. The filled coolant is a mixture of water and glycol. An impeller driven by the motor shaft continuously circulates the coolant. The cooling system is unpressurised when cold. A built-in pressure relief valve limits the maximum operating pressure to 3 bar (43 psi). The cooling flange transmits the waste heat to the pumped fluid. Permanently lubricated roller bearings are used for the motor bearings. The power cable is longitudinally watertight and has bare cable ends.

HC motor

Self-cooling submersible motor with active cooling system for wet and dry installation. The cooling system is designed with a closed and hermetically sealed cooling circuit. The filled coolant is a mixture of water and glycol. A magnetically driven impeller on the motor shaft continuously circulates the coolant. The cooling system is unpressurised when cold. A built-in pressure relief valve limits the maximum operating pressure to 3 bar (43 psi). The cooling flange transmits the waste heat to the pumped fluid. Permanently lubricated roller bearings are used for the motor bearings. The power cable is longitudinally watertight and has bare cable ends.

Seal

All motors have a sealing chamber. The sealing chamber collects any leakage from the fluid side mechanical seal. Fluid and motor side seals are available in the follow designs, depending on the motor type:

• Design H: Mechanical seal for the fluid side, rotary shaft seal for the motor side
• Design G: Two independent mechanical seals
• Design K: Block seal cartridge with two independent mechanical seals

Operating fluids

All operating fluids are potentially biodegradable and not dangerous to the environment:

• White medical grade oil
• Water-glycol mixture (35 % glycol and 65 % water)

Motor efficiency classes (based on IEC 60034-30)

In addition to the standard motors, IE3 (Premium Efficiency) motors are also available. The IE3 motors are based on the same design as the standard motors. The motors are therefore identical in terms of equipment and function.

Scope of delivery

• Pump
• Fitted accessories as ordered
• Installation and operating instructions

Options

• Special voltages
• Pumping fluids up to 60 °C (140 °F)
• Motor dependent monitoring devices:
  • Winding temperature monitoring with PTC sensors as an upgrade for motors with bimetallic sensors
  • Sealing chamber and motor/terminal compartment leakage monitoring
  • Motor bearing temperature monitoring
  • Vibration monitoring
• Ceram coating for abrasive and corrosive fluids
• Digital Data Interface for easy integration into control systems and monitoring:
  • Ethernet interface for easy connectivity
  • Easy integration into existing control systems using ModBus/TCP or OPC UA
  • Save daily time and decrease workload with convenient remote monitoring
• Ex-rated according to
  • ATEX
  • FM
  • IECEx

Accessories

• Suspension unit for stationary wet installation
• Pump foot for portable installation
• Foot elbow for stationary dry installation
• Level controls
• External moisture probe for leakage detection
• Fixation sets with anchor bolts
• Slinging gear
• Switchgear and relays