Centrifugal Pumps

Pompa Centrifugal Grundfos & Flyght Xylem

Pompa Grundfos dan Flyght ini merupakan pompa yang sangat umum didalam suatu industri, biasanya sekitar 80% pompa yang digunakan dalam suatu industri ialah pompa sentrifugal Grundfos .Pompa Sentrifugal adalah pompa dengan prinsip kerja merubah energi kinetis (kecepatan) cairan menjadi energi potensial (tekanan) melalui suatu impeler yang berputar dalam suatu casing. Pompa Grundfos dan Ebara ini terdiri dari komponen utama berupa kipas (impeler) yang dapat berputar dalam sebuah casing (rumah pompa), casing tersebut dihubungkan dengan saluran isap dan saluran tekan. Untuk menjaga  agar didalam casing selalu terisi cairan, maka ada saluran isap yang harus dilengkapi dengan katup kaki (foot valve). Impeler yang berputar akan memberikan gaya sentrifugal sehingga cairan yang ada pada bagian pusat impeler akan terlempar keluar dari impeler yang kemudian ditahan casing sehingga menimbulkan tekanan alir.

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Untuk pemesanan dapat dilakukan melalui :

E-mail  : info@heksamandiri.co.id
Phone:(6221) 295 296 30 & 295 296 31
Mobile: 0811136586

Cara Kerja Centrifugal Pump.

Centrifugal pump atau pompa centrifugal adalah jenis pompa yang paling banyak digunakan, ia memiliki kelebihan diataranya karena pengoprasiannya yang mudah, maintenance yang tidak terlalu mahal, tidak berisik dan lain sebagainya.

Sebelum ke cara kerja centrifugal pump, ada baiknya kita memahami prinsip kerja dari pompa terlebih dahulu. Pompa adalah alat untuk mengalirkan fluida cair. Bedanya dengan compressor, compressor biasanya digunakan untuk mengalirkan fluida yang compressible, fluida yang dapat di mampatkan seperti udara.

Prinsip kerja pompa adalah ia menciptakan tekanan vakum pada inletnya, yang akhirnya menyerap fluida ke dalam pompa, kemudian mendorongnya melalui lubang keluar yang disebut outlet atau discharge. Ada dua jenis pompa sebenarnya, yaitu positif displacement pump dan satu lagi jenis kinetic, centrifugal pump ini masuk dalam jenis pompa yang kinetic.

Prinsip Kerja Centrifugal Pump.

Pada pompa centrifugal, ia memanfaatkan gaya centrifugal. Seperti apa gaya centrifugal? Coba kita buat sedikit experiment untuk memahami gaya centrifugal. Misalnya kamu punya sebuah wadah, ember yang berisi air misalnya. Kamu putar terus menerus, ketika putaran itu semakin kencang, di tanganmu akan terasa tertarik oleh gaya dari air yang kamu putar. Semakin kencang putarannya, semakin besar gayanya. Gaya pada lenganmu itulah gaya centrifugal.

Kalau di definisikan, gaya centrifugal adalah gaya gerak melingkar yang berputar menjauhi pusat lingkaran, dimana nilainya adalah positif. ketika impeller (baling baling) berputar maka air akan terdorong di impeller lewat gaya centrifugal dan akhirnya keluar di saluran discharge, sedangkan pada suctionnya menjadi negative pressure nya yang menyebabkan air jadi terisap pada suction nya.

Jenis Impeller Pada Centrifugal Pump.

Berbicara mengenai impeller pada centrifugal pump, ia dibagi menjadi 3 bagian, yaitu :

open impeller, dimana baling baling itu bebas, ia tidak ada penahan di sisi depan atau belakangnya, biasanya ini dipakai pada axial flow.

Semi open impeller adalah kondisi dimana baling baling itu bebas di satu sisi, tapi disisi yang lainya ditutup.

Dan yang terakhir adalah enclosed impeller, yaitu baling baling berada di Antara dua disk (penutup), dan biasanya di cor menjadi satu bagian.

Demikian artikel ini kami buat.

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Email   : info@kamjaya.com

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The Centrifugal Pump - KAMJaya

The Centrifugal Pump

In 1689 the physicist Denis Papin invented the centrifugal pump and today this kind of pump is the most used around the world. The centrifugal pump is built on a simple principle : liquid is led to the impeller hub and by means of the centrifugal force it is flung towards the periphery of the impellers.

The construction is fairly inexpensive, robust and simple and its high speed makes it possible to connect the pump directly to an asynchronous motor. The centrifugal pump provides a steady liquid flow, and it can easily be throttled without causing any damage to the pump.

If a pressure difference occurs in the system while the centrifugal pump is not running, liquid can still pass through it due to its open design.

The difference demands on the centrifugal pump’s performance, especially with regard to head, flow, and installation, together with the demands for economical operation, are only a few of the reasons why so many types of pump exist.

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.

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

End 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 - Fire Systems

Overview fire systems by Grundfos pump

Wilo-Comfort Pump

Design

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

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

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 Pumps - horizontal multistage pump CM - CME

The 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

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:
  Q_optimum (volume flow at which the pump reaches its best efficiency), to be read from the individual pump curve; factors Q_min and Q_max , to be taken from the table “Recommended limit values for dimensioning”.Q_{min dimensioning} = Q_min x Q_optimum
  Q_{max dimensioning} = Q_max x Q_optimum
  Example: Size NL 32-125
  Q_min = 0.3 x 8 = 2.4 m³/h
  Q_max = 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