Archive for January 2015

Grundfos Submersible Drainage Pumps

Overview

DWK and DPK are grundfos submersible pumps designed for dewatering and drainage applications. The cast-iron construction and the hydraulic design contribute durability and high efficiency. The differences between the DWK and DPK Grundfos Submersible pump ranges lie in the discharge arrangement and the installation type. The DWK is designed with a top discharge pipe and suction strainer, and is thus more suitable for temporary installation, whereas the DPK has a side discharge and a ring-stand or auto coupling (as accessories), and is suitable for permanent installations.

Applications

DWK/DPK are excellent Grundfos Submersible pumps for dewatering and draining applications. The combination of compact design with high-pressure capability makes the pumps suitable for use in pits, whether for temporary or fixed installation. The installation design options provide the flexibility needed to cover many needs.

Grundfos Submersible Applications include:

  • Construction sites
  • Excavations
  • Tunnels
  • Fish ponds
  • Drainage pits.

 

Features and benefits

  • Durability
  • High efficiency
  • Installation flexibility
  • High-pressure capabilities, cost-effectiveness.

Grundfos CR-Pumps

The basic pumps CR pumps range, which can be applied in almost any industrial solution, is already in itself the broadest range available. Through our modular approach, we have made it even broader.

The basic CR pumps range is available in four different materials: cast iron, two grades of stainless steel, and all-titanium. There are eleven flow sizes pumps, capable of producing up to almost 50 bar of pressure, and with a variety of shaft seals, rubber materials and supply voltages.

 

Grundfos CR Pumps

Pumps parts which are typically vulnerable to difficult liquids or particularly demanding operating conditions can be optimised for their purpose and designed for specific requirements.

 

Applications Pumps

CR pumps provide a complete range of pumps solutions so that all applications, industrial and domestic, can benefit from the Grundfos pumps touch. The applications that can be covered include the following:

  • Process water systems
  • Washing and cleaning systems
  • Seawater systems
  • Pumping of acids and alkalis
  • Ultrafiltration systems
  • Reverse osmosis systems
  • Swimming baths.

 

Features and benefits pumps

  • Reliability
  • High efficiency
  • Service-friendly
  • Space-saving
  • Suitable for slightly aggressive liquids
  • High corrosion resistance
  • Single-pump solution making high pressures possible.

Ebara - End Suction Pumps

ebara-pumps-end-suctionEnd Suction Volute Pump.
Features:

  •  Easy Confirm to JIS Standard JIS B8313 with 2 pole and 4 pole choice.
  • BPO (Back Pull Out) Type can be dissembled and inspected without removing the suction and discharge piping.
  • Top centerline discharge, foot support under casing for maximum resistance to misalignment and distortion from pipe loads.

 

Application:

  • General Water supply
  • Hot and cold water circulation
  • Irrigation
  • Industrial Water

Grundfos end-suction pumps

Grundfos end-suction pumps are used in water supply, industrial pressure boosting, industrial liquid transfer, HVAC (heating, ventilation and air-conditioning), and irrigation.
Grundfos end-suction pumps are multi-purpose pumps suitable for a variety of different applications requiring reliable and cost-efficient supply. End-suction pumps are used in five main areas of application: water supply, industrial pressure boosting, industrial liquid transfer, HVAC and irrigation by Grundfos end-suction pumps

The Grundfos NB/NBG pumps are all non-self-priming, single-stage, centrifugal volute pumps with axial suction port, radial discharge port and horizontal shaft. The NB/NBG range consists of close-coupled pumps with their main dimensions in accordance with either EN733 or ISO2858.

Applications for Grundfos end-suction pumps

Grundfos offers a virtually limitless range of close coupled (NB) end-suction pumps. Their sturdiness and reliability make them ideal for use in demanding environments such as the following:

  • District heating plants
  • Heating systems for blocks of flats
  • Air-conditioning systems
  • Cooling systems
  • Wash down systems
  • Other industrial systems.

 

Features and benefits Grundfos end-suction pumps

  • Optimised hydraulics in housing and impeller = unimpeded liquid flow
  • O-ring seal between pump housing and cover = no risk of leakage
  • pumps Housing, impeller and wear ring in different materials = improved corrosion resistance, no sticking elements
  • Pump is CED coated to increase corrosion resistance
  • Available with IE1, IE2 and IE3 motors
  • Available in a number of shaft seal and material variants
  • PN 10,16 and 25 bar
  • For temperatures up to 140 °C.

Grundfos - Fire Systems

fire-pump-grundfosOverview fire systems by Grundfos pump

NBF is an end-suction pump made for fire sprinkler pump applications. NBF is a close-coupled type and NKF is a long-coupled type.

The NKF fire system is an NBF or NKF end-suction pump integrated with a coupling and a driver, which may be an electric motor or a diesel engine, assembled on a base frame.

Electric pump types can be ordered as a COMPACT model (inclusive of a controller integrated onto the baseframe).

Diesel-driven NKF. A controller always forms a part of the system.

Materials Pump

The pump materials are in compliance with EN 12845 and prEN12259-12:

  • Impeller and wear rings are made of bronze
  • Wet parts such as shaft, washers and nuts are made of stainless steel
  • Castings are made of cast iron.

Controller Pump

Grundfos offers a complete, factory-assembled controller in a steel plate cabinet, suitable for wall mounting or to install free-standing. The controller pump complies with the EN 12845 standard. The controller for diesel-powered pump is always mounted on the base frame.

Electric motor

The electric motor is an MG or MMG motor complying with local standards for electric motors. As from 16 July 2011, the motors used in Europe will be IE2 = EFF 1 motors.

Diesel engine

The diesel engine can operate continuously at full load at site elevation with rated output in accordance with ISO 3046-1:1986. The pump reaches full operational speed within 15 seconds; the engine is capable of starting at a room temperature of 5 °C.

Each complete engine pump unit is tested on the manufacturer’s test bed for at least 1.5 hours at rated flow rate, and the result recorded on the test certificate.

Applications Pump

The Grundfos fire pump units are typically used in fire-fighting applications for supplying water to fire-hose reels, fire hydrants or sprinkler systems.

Features and benefits Pump

  • Pump are made according to EN12845 and PrEN12259-12
  • Electric or diesel powered
  • Designed pump for superior functionality and performance reliability
  • Simple installation and easy maintenance
  • Compact design Pump
  • Customised and reliable solutions
  • Widest range from one supplier.

Wilo-Comfort Pump

wilo-comfort-pump-transfer-pompaDesign

 

Highly efficient water-supply unit ready for connection (non self-priming). With 2 to 6 vertically arranged Helix VE series stainless steel high-pressure centrifugal pumps in glanded version switched in parallel; every pump is equipped with an integrated air-cooled frequency converter, including Comfort Controller CCe

 

 

Application

 

  • Fully automatic water supply and pressure boosting in residential, commercial and public buildings, hotels, hospitals, department stores and for industrial systems.
  • Pumping of drinking water, process water, cooling water, fire water (apart from fire-extinguishing systems in accordance with DIN14462) or other water mixtures that do not attack the materials used chemically or mechanically and do not contain abrasive or long-fibre constituents

 

Type key

 

Example: Wilo-COR-4 Helix VE 1603/K/VR
COR Compact pressure boosting system with integrated speed control of each pump
4 Number of pumps
Helix VE Pump series
16 Rated volume flow [m3/h] of the single pump
03 Number of single pump stages
K With cartridge mechanical seal
5.5 Rated motor power P2 in kW [only included if more than one motor is available for types with the same hydraulic output]
CCe Control device; CCe = Comfort Controller for pumps with integrated frequency converter

 

Special features/product advantages

 

  • Sturdy system with Helix VE stainless steel high-pressure circulation pumps with integrated frequency converter that can be controlled from 25 Hz to 60 Hz
  • High-efficiency pump hydraulics
  • Entire system is pressure-loss optimised
  • Integrated dry-running detection with automatic deactivation via the motor control electronics
  • Maximum degree of control using the CCe control device with additional functions, micro-computer control and touch display

 

Technical data

 

  • Mains connection 3~400 V ± 10%, 50 Hz; 3~380/440 V ±10 %, 60 Hz
  • Max. fluid temperature +50 °C (+70 °C optional)
  • Ambient temperature max. 40 °C
  • Operating pressure 16 bar (25 bar optional)
  • Inlet pressure 10 bar
  • Nominal connection diameters on discharge side R 1½ ‐ DN 125
  • Nominal connection diameters on inlet side R 1½” – DN 125
  • Speed range 1500-3770 rpm
  • Protection class: IP 54
  • Fuse protection on mains side A, AC 3 according to motor power and EVU regulations
  • Approved fluids (other fluids on request):
    • Drinking water and domestic hot water
    • Cooling water
    • Fire water

    Note on fluids: Approved fluids are generally waters which do not attack the materials used, neither chemically nor mechanically, and do not contain any abrasive or long-fibre constituents. System in accordance with DIN 1988 (EN 806)

 

Equipment/function

 

  • 2-6 pumps per system of the Helix VE 4 to Helix VE 16 series, with IE2-equivalent standard motors and variable auto control with integrated frequency converter for each pump
  • Automatic pump control via Comfort Controller CCe
  • Parts that come in contact with the fluid are corrosion-resistant
  • Base frame made of galvanised steel, with height-adjustable vibration absorbers for insulation against structure-borne noise
  • Check valve on the suction and pressure sides of each pump
  • Non-return valve on the pressure side of each pump
  • Diaphragm pressure vessel 8 l, PN16, pressure side
  • Pressure sensor, pressure side
  • Pressure gauge, pressure side
  • Optional low-water cut-out switchgear with pressure gauge, suction side

 

Description/design

 

  • Base frame: galvanised steel, with height-adjustable vibration absorbers for comprehensive insulation against structure-borne noise; other versions on request
  • Pipework: complete pipework made of stainless steel, suitable for the connection of all piping materials used; the pipework is dimensioned according to the overall hydraulic performance of the pressure boosting system
  • Pumps: 2 to 6 pumps of the Helix VE 4.., 6.., 10.., 16.. series are used, which are connected in parallel. The air-cooled frequency converters mounted on the pump motor enable infinitely variable control between 25 Hz and a maximum of 60 Hz for all pumps of this series. All parts which come in contact with fluid are made of stainless steel for the Helix VE 4.., 6.., 10.., 16..; other versions on request. KTW/WRAS/ACS approval for all parts that come in contact with the fluid
  • Valves: With the Helix VE 4.., 6.., 10.., 16.. series, every pump is fitted on the suction and pressure side with a check valve with DVGW approval mark and on the pressure side with a non-return valve with DVGW/KTW approval
  • Diaphragm pressure vessel: 8 l/PN16 to be arranged on the discharge side. With a diaphragm made of butyl rubber, with DVGW/KTW approval, completely safe in accordance with food safety laws for testing and inspection purposes, with drain and throughflow valve with DVGW/KTW approval in accordance with DIN 4807.
  • Pressure sensor: 4 to 20 mA, located on the discharge side for controlling the central Comfort Controller CCe
  • Pressure indication: pressure gauge (ø 63 mm) arranged on the discharge side; additional digital indication of the discharge pressure on the alphanumeric touchscreen on the Comfort Controller
  • Switchgear/controller: The system is equipped with a Comfort Controller CCe as standard

 

Materials

 

For the series with Helix VE 4 to VE 16:

  • Impellers, diffusers, stage housing made of stainless steel 1.4307
  • Pump housing made of stainless steel 1.4301
  • Shaft made of stainless steel 1.4057
  • 1.4404 shaft protection sleeve
  • O-ring gaskets made of EPDM (FKM gasket on request)
  • Pipework made of stainless steel 1.4571

 

Scope of delivery

 

  • Factory-mounted, connection-ready pressure boosting system checked for functionality and impermeability
  • Packaging
  • Installation and operating instructions
  • Transport eyes for self-assembly

 

Planning guide

 

Inlet pressure

The maximum inlet pressure (see Technical data) must be taken into account when configuring the system. The maximum permissible inlet pressure is calculated from the maximum operating pressure of the system minus the maximum pump delivery head at Q = 0

Pressure reducer

Fluctuating inlet pressure is compensated by the speed control integrated into each single pump as long as the pressure fluctuation is not greater than the difference between the setpoint pressure value and the zero-delivery head of the single pump at minimum speed. If the pressure fluctuation is greater, a pressure reducing valve must be installed upstream of the system.

Volume flow

Up to 155 m3/h (43 l/s) system configuration in accordance with DIN 1988 (EN 806); with standby pump up to 185 mm3/h (51 l/s) during operation of the standby pump as an auxiliary peak-load unit

Residual-current-operated protection

switch

When installing residual-current-operated protection switches in conjunction with frequency converters, bear in mind that only universal-current-sensitive residual-current-operated protection switches in accordance with DIN/VDE 0664 are to be fitted.

Wilo-WMS low-water cut-out switchgear

The series Helix VE pump being used is already equipped with an integrated dry-running detection as safety equipment for the pump. Nevertheless, the installation of a low-water cut-out switchgear is required in cases where the pressure boosting systems are connected directly to a public mains power supply; that prevents the inlet pressure in the mains supply line from falling below 1.0 bar. Please order directly when ordering the pressure boosting system. The WMS will then be installed in the pressure boosting system, electrically wired and fully tested by Wilo during the final functional test.

Standards/directives

The overall system conforms with the requirements of

  • DIN 1988 Part 5
  • DIN 1988 Part 6* (**)

* The specifications in DIN 1988 (EN 806) and of the water-supply companies are to be observed. Regarding the electrical components, the system conforms with the requirements of

  • VDE 0100 Part 430/Part 540
  • VDE 0110 Part 1/Part 2
  • VDE 0660 Part 101/Part 107 and
  • DIN 40719/IEC 754

Always observe the specifications in DIN 1988 (EN 806) when using and operating the pressure boosting system.(**) That does not apply to fire extinguishing systems in accordance with DIN 14462. Please request these separately.

grundfos - Dosing DMX

DMX-dosing-grundfosGeneral

The Grundfos DMX range has proven its worth in dosing applications worldwide. With their robust diaphragm-based design and their high-quality motors DMX pumps require minimum maintenance and are best choice for many dosing applications. The DMX range is highly versatile: it covers a wide flow range and offers a variety of dosing head sizes, materials and accessories.

Accurate dosing – all the time

The diaphragm design ensures that the dosing flow variation is below ± 1.5 % and the linearity deviation is kept below 4 % at all times. This allows very precise dosing of your chemicals – as much as necessary, as little as possible.

Smooth and low-pulsation dosing

The DMX series combines sophisticated drive technolo­gy and gear kinematics to ensure smooth and low-pulsation dosing without pressure peaks. This means less stress to all system components, such as tubes and valves, and leads to longer

service

intervals for the entire system.

Motors to match application needs

For applications with specific motor requirements, the versatile DMX range offers high-quality motors for 50 Hz, 60 Hz, 100 Hz (with Variable Frequency Drive VFD), as well as EX classified or ATEX-certified motors, if required.

Perfect material selection – for housing and liquid-wetted parts

The smaller DMX models have plastic housings offering chemical resistance and all the protec­tion necessary for many applications. The larger models have a robust cast-aluminium housing with epoxy coating to meet all application needs. Investment costs and running costs for spare parts are kept low over the years: A wide choice of materials for dosing head, valves and accessories allow selecting exactly the degree of chemical resistance required. All liquid-wetted parts need to be resistant to the chemicals used. The diaphragm is made of NBR and PTFE-coated.

Compact design – saves money and space

DMX pumps are available in 12 different dosing head sizes. Careful design work has kept them all very compact. This saves material costs and allows placing several pumps right next to each other in confined spaces. Double-head versions (DMX models 226 and 227) offer a very cost-efficient way to save space or to dose two different chemicals. The extra capacity offered by double-head versions can also be used to gain higher flow rates for a single chemical.

Accessories ensure perfect operation of the entire system

A wide range of accessories specially designed for the DMX series help optimise performance: AR control electronics (contact signal control with multiplier and divisor function, 4-20 mA control or stroke frequency control via display and key pad, low-level/empty signal), integrated relief valve, dosing controller, diaphragm leakage detection, servomotor for automatic stroke length adjustment, PTC motors with Variable Frequency Drive (VFD). We also offer system components such as pressure loading valves and pulsation dampers.

Applications

Disinfection, coagulation, flocculation, precipitation, etc. in:

  • Drinking water treatment
  • Waste water treatment
  • Pulp and paper industry
  • Textile industry
  • Cleaning water treatment
  • Food & Beverage industry, dairies
  • Cooling tower water treatment
  • Low-pressure boiler feed water treatment

Grundfos Pumps - horizontal multistage pump CM - CME

horizontal, multistage, end-suction centrifugal pumps-grundfos pumpsThe Grundfos Pumps horizontal multistage pump CM (=Centrifugal Modular) has been created with compactness and modularity as two of its central features, making numerous configurations possible. The pump is basically composed of a series of interchangeable modules, all of which have been designed to work together seamlessly, no matter what the application.

The pumps are of the close-coupled type.

The difference between the CM and the CME pump ranges is the motor. CM pumps are fitted with mains-operated motors, whereas the motors for CME pumps have an integrated frequency converter.

Both CM and CME Grundfos Pumps have mechanical shaft seals.

The CM and CME Grundfos Pumps are available in cast iron or stainless steel (AISI 304/DIN 1.4301 stainless steel, which is for water and non-corrosive liquids, and AISI 316/DIN 1.4401 stainless steel, which offers a high degree of corrosion protection against aggressive liquids).

Applications of Grundfos Pumps

The CM or CME Grundfos Pumps is a multi purpose pump for both industry and water boosting in general.

It is compact, noiseless, reliable and flexible, and this make it an optimal solution for installation and interaction with other components in small and large systems or as a stand-alone pump.

Features and benefit Of Grundfos Pumps

  • Compact design
  • Modular construction/customised solutions
  • Worldwide usage
  • High reliability
  • Service-friendly
  • Wide performance range
  • Low noise level
  • High-performance hydraulics
  • Electro-coated cast-iron parts
  • Customised solutions
  • Grundfos motor
  • E-solutions
  • High efficiency.

Wilo Pumps - CronoNorm NL Series

Design Of Wilo Pumps

 

Single-stage low-pressure centrifugal Wilo Pumps with axial suction point, according to EN 733 and ISO 5199, mounted on a baseplate.

 

Application Wilo Pumps

 

  • For pumping heating water (in accordance with VDI 2035), water-glycol mixtures and cooling and cold water without abrasive substances in heating, cold water and cooling water systems
  • For applications regarding the municipal water supply, irrigation, building services, industry, power stations etc. (e.g. circulation, transfer and pressure-boosting tasks)

 

Type key of Wilo Pumps

 

Example NL 40/200B-11/2
NL Standard pump with axial suction
40 DN for the pressure flange
200B Nominal diameter of impeller
11 Rated motor power P2 [kW]
2 number of poles

 

Special features/product advantages of Wilo Pumps

 

  • Reduced life-cycle costs through optimised efficiency levels
  • Bidirectional, force-flushed mechanical seal
  • Low NPSH values, best cavitation properties
  • Shaft coupling with or without intermediate sleeve
  • Shaft deflection satisfies the requirements of ISO 5199

 

Technical data of Wilo Pumps

 

  • Minimum Efficiency Index (MEI) ≥ 0.4
  • Permissible temperature range of -20°C to +120°C
  • Mains connection 3~400 V, 50 Hz
  • Protection class IP 55
  • Nominal diameter DN 32 to DN 150
  • Max. operating pressure 16 bar

 

Scope of delivery

 

  • Wilo Pumps with free shaft end or
  • Wilo Pumps on baseplate with coupling and coupling protection or
  • Completely mounted pump on baseplate with electric motor
  • Installation and operating instructions

 

Materials of Wilo Pumps

 

  • Wilo Pumps housing and pressure lid: EN-GJL-250
  • Bearing bracket: EN-GJL-250
  • impeller: EN-GJL-250
    (special version: G-CuSn10)
  • Shaft: X20Cr13
  • Mechanical seal: AQ1EGG
    (other mechanical seals on request)

 

Description/design of Wilo Pumps

 

  • Wilo Pumps Single-stage low-pressure centrifugal pump as baseplate pump with axial suction piece with flanged bearing bracket and axis mounting for flexibly coupled drives.
  • Spacer coupling (sleeve coupling) available as an option; they make it possible to leave the motor in position when removing the rotor unit
  • Shaft deflection meets the requirements of ISO 5199

 

Commissioning

 

  • If pumps with 2900 rpm are installed inside residential buildings, then corresponding noise reducing measures are to be implemented.
  • Pump curves and specific motor powers depend on the respective fluid being pumped. Pump curves and power vary considerably when fluids are conveyed that differ from water in thickness and/or viscosity. For this, please observe the table “Recommended limit values for dimensioning”.
    The recommended limit values for dimensioning are calculated as follows:
    Qoptimum (volume flow at which the pump reaches its best efficiency), to be read from the individual pump curve; factors Qmin and Qmax , to be taken from the table “Recommended limit values for dimensioning”.Qmin dimensioning = Qmin x Qoptimum
    Qmax dimensioning = Qmax x Qoptimum
    Example: Size NL 32-125
    Qmin = 0.3 x 8 = 2.4 m3/h
    Qmax = 1.2 x 8 = 9.6 m3/h
  • Load-sensitive pump output
    All Wilo standard pumps are equipped with IEC standard motors. The Wilo control devices are suitable for automatic load-sensitive speed control of pumps that are driven by any standard motors of conventional manufacture.
  • Main/standby mode

 

Accessories Wilo Pumps

 

Automatic speed control:

for automatic, infinitely variable pump power control. for additional information, see “Switchgears and control devices” section.

 

Note

 

Motors with efficiency class IE3, other voltages and frequencies on request

 

General notes – ErP (ecological design-) directive

 

  • The benchmark for most efficient water pumps is MEI ≥ 0.70
  • The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
  • The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
  • Information on benchmark efficiency is available at www.europump.org/efficiencycharts

 

Wilo Pumps - CronoLine IL Series

wilo-pump-2014-cronoline-ILWilo Pumps Design

Glanded wilo pumps in in-line design with flange connection

 

Application in the water Of Wilo Pumps

 

For pumping heating water (in accordance with VDI 2035), water-glycol mixtures and cooling and cold water without abrasive substances in heating, cold water and cooling water systems

 

Type key of Wilo Pumps

 

Example
IL 40/160-4/2
IL In-line pump
40 Nominal diameter DN of the pipe connection
160 Nominal impeller diameter
4 Rated motor power P2 in kW
2 Number of poles

 

Special features/product advantages Of Wilo Pumps

 

  • Reduced life cycle costs thanks to optimized efficiency
  • Standard condensate drainage holes in the motor housings
  • Can be used flexibly in air-conditioning
  • and cooling systems, with application benefits due to direct draining of condensate via optimised lantern design (patented)
  • High standard of corrosion protection thanks to cataphoretic coating
  • High worldwide availability of standard motors (according to Wilo specifications) and standard mechanical seals

 

Technical data

 

  • Minimum Efficiency Index (MEI) to ≥ 0.4
  • Permissible temperature range -20 °C to +140 °C
  • Mains connection 3~400 V, 50 Hz (others on request)
  • Protection class IP 55
  • Nominal diameter DN 32 to DN 250
  • Max. operating pressure 16 bar (25 bar on request)

 

Description/design Of Wilo Pumps

 

Single-stage, low-pressure centrifugal pump in in-line design with

  • Mechanical seal
  • Flange connection with pressure measuring connection R 1/8
  • Lantern
  • Coupling
  • IEC standard motor

 

Materials Wilo Pumps

 

  • Pump housing and lantern: Standard: EN-GJL-250; optionally spheroidal cast iron EN‐GJS‐400‐18‐LT
  • Impeller: Standard: EN-GJL-200; Special version: Red brass G-CuSn 10
  • Shaft: 1.4122
  • Mechanical seal: AQEGG; other mechanical seals on request

 

Scope of delivery

 

  • Pump
  • Installation and operating instructions

 

Options wilo pumps

 

  • L1 variant with red brass impeller (at additional charge)
  • H1 variant with housing made of spheroidal cast iron (at additional charge)
  • P4 variant for maximum operating pressure of 25 bar (see Wilo price list)
  • Motors with efficiency class IE3, other voltages and frequencies, as well as ATEX approval on request

 

Accessories of Wilo Pumps

 

  • Mounting brackets for installation on a base
  • PTC thermistor sensor, PTC resistor tripping relay
  • Special motors
  • Special mechanical seals
  • SC-HVAC, CC-HVAC, VR-HVAC control systems and switchgear

 

General notes – ErP (ecological design-) directive

 

  • The benchmark for most efficient water pumps is MEI ≥ 0.70
  • The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the wilo pumps to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
  • The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
  • Information on benchmark efficiency is available at www.europump.org/efficiencycharts

 

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