Rexa NORM
Norm pump
- Optimised impellers and low NPSH values facilitate smooth operation – even under partial or overload conditions.
- High overall efficiency ensures low operating costs
- Optimised design in the bearing bracket and additional sealing gap on the mechanical seal on the fluid side provide high reliability
- Easy impeller replacement due to back pull-out design and spacer coupling as standard. This makes it possible to remove the impeller without dismantling the hydraulics from the pipeline and the motor from the baseplate
- Shut “back pull out” unit: Dismantling without draining the oil in the sealing chamber.
Logos/Certifications
Recommended services
Design
Sewage pump for stationary dry well installation in continuous operation in two versions:
- Unit: Hydraulics with standard motor, connected via coupling, fully mounted on baseplate
- Bare shaft: Hydraulics mounted on baseplate, coupling pre-assembled
Application
Pumping of
- Untreated sewage
- Sewage containing faeces
- Process water
- Wastewater
Equipment/function
- Winding temperature with PTC or Pt100 sensor (motor dependent)
- Optional external pencil electrode for the sealing chamber monitoring
Type key
Example: | Wilo-Rexa NORM-E25.74-480DAH315S6 |
Rexa | Sewage pump |
NORM | Hydraulics with standard motor, connected via coupling, fully mounted on baseplate |
E | Type of impeller:
|
25 | Nominal diameter of pressure connection, e.g. DN 250 |
74 | Performance indicator |
480 | Impeller diameter |
D | Version flange hole:
|
A | Standard material version |
H | Type of installation: Horizontal |
315S | Construction size standard motor |
6 | Number of poles (nominal speed of the hydraulics) |
Technical data
Hydraulics:
- Fluid temperature: 3…70 °C
- Ambient temperature: 3…40 °C
Motor:
- IEC standard motor, connection B3
- Operating mode: S1
- IP rating: IP55
- Insulation class: F
- Motor efficiency class: up to IE4
Materials
- Hydraulics housing: EN-GJL 250
- Impeller: EN-GJL 250
- Hydraulics shaft: Stainless steel 1.4021
- Bearing bracket: EN-GJL-250
- Static gaskets: NBR
- Sealing on pump side: SiC/SiC
- Sealing on motor side: NBR
- Coupling: Stainless steel
- Baseplate: EN-GJL 250 or steel (dependent on type)
Construction
Hydraulics
Hydraulic system with axial suction ports, radial discharge ports and bearing brackets as a single unit. The connections are configured as flange connections.
Seal
Bearing bracket with sealing and leakage chamber for admission of fluid ingress via the seal. Fluid-side seal via a bidirectional mechanical seal, coupling-side seal as a rotary shaft seal. The sealing chamber is filled with medical white oil, the leakage chamber is shut up to the coupling. Optionally, the sealing chamber can be monitored with an external pencil electrode.
Motor
IEC standard motor version B3 permanently connected with the hydraulics via spacer coupling. Three-phase current motor with thermal motor monitoring and motor efficiency class up to IE4.
Scope of delivery
- Sewage pump as a unit:
- Hydraulics
- Standard motor in three-phase version without connection cable
- Fully mounted on baseplate and connected via a coupling
- Installation and operating instructions
- Sewage pump as a bare shaft:
- Hydraulics mounted on baseplate
- Coupling pre-assembled
- Installation and operating instructions
Options
- Ceram coating for abrasive and corrosive fluids
- IEC standard motor in corresponding version
- ‘Bare shaft’ version
Accessories
- External pencil electrode for monitoring the sealing chamber
- Switchgear, relays and plugs
- Fixation sets with anchor bolts