Fire- Fighting

Pumps used in Fire Fighting of pump manufacturers in china

Pumps used in Fire Fighting of pump supplier in china

Fire Pump Function

The type of pump used to move water through a fire sprinkler system or to manual hose bibs in a commercial building or industrial plant. The pump’s intake is usually connected to the external water supply, although in some cases it may be connected to a local water source such as a well, tank, or body of water.

The fire pump system, of which the pump is the critical component, is designed to quickly deliver enough water to efficiently douse a fire before it has a chance to spread. In many areas, they are required to be periodically tested and certified by the local fire inspection agency. They are commonly used in buildings with upper floors that are too high to be reached with the pressure of the local water supply, or where there is not enough fire fighting capacity from the local water supply.

They generally work within the following ranges:

Capacity ranges between 20 and 5,000 gpm

Total head (pressure) ranges between 30.5m and 365.8m

Horsepower ranges between 7.5kw and 600Kw

Fire pumps and the rest of the system are required to meet the requirements of NFPA (National Fire Protection Association), UL (Underwriter’s Laboratory), and, in Canada, CSA (Canadian Standards Association). These requirements are quite detailed as to both the hydraulic and the mechanical requirements for the pump, driver, and controls. There are a limited number of NFPA, UL, and CSA approved pump suppliers. Local standards and the owner’s insurance requirements should be studied carefully before selecting a fire pump type and supplier.

Fire Pump working

They are usually centrifugal pumps and are powered by either an A.C. electric motor or a diesel engine. When one of the sprinklers in the building detects a high level of heat, the pump begins working immediately. In some cases, the fire regulations may require a fire pump to have an emergency generator as a back-up in the event of a power failure. Small, portable engine-driven configurations are used in forest fire fighting applications.

Fire pump mechanisms

The most common types are horizontal split case of eu-flo’s EOW and vertical turbine of eu-flo’ FVTE . Some applications for lower flows may include end suction eu-flo’ FIOE or vertical inline of eu-flo’ oh5. Many fire systems also use a jockey pump. This is a small centrifugal pump that runs continuously to keep the fire system piping filled and under pressure. This ensures that the sprinklers will be immediately effective when they are opened and the fire pump is started.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump




Centrifugal pump use in Oil&Gas of pump manufacturers in china

Centrifugal pump use in Oil&Gas of pump supplier in china

Pump for Oil&Gas Application Descripiton

Oil&Gas Pump Type

Pumps are necessary components inside an oil drilling rig. They’re designed to accelerate the transference of fluid from one location to another. Without pumps, refineries cannot operate, as oil displacement is essential to an oil rig’s entire operation. Below, we explore different types of pumps companies use in oil and gas downstream operations, their primary function, and the pros and cons of each model.

Centrifugal Pump

The most common type of pump found in the oil and gas industry is undoubtedly the centrifugal pump. Centrifugal pumps contain one or more impellers that move fluid by rotation and draw fluid into the suction end of the pump and then, through centrifugal force, force it out of the discharge end. This design allows the pumps to be used for a wide range of applications and are preferred for processes that handle low viscosity liquids and high flow rates. Centrifugal pumps can also handle dirty liquids or liquids with low viscosity as long as they do not contain air, vapors, or a heavy amount of solids.

Centrifugal pumps are used in the upstream oil and gas industry as part of the tri-phase or multiphase pumping applications. These pumps serve a wide variety of applications with many types such as electric submersible pumps, which are used as a water and oil separator in which water can be re-injected into a reservoir without lifting it to the ground surface. They can transport a significant amount of low viscosity liquids in a short period and can pump several hundred gallons of liquid per minute if the product is compatible.

Oil Pump

A standard oil pump mechanically lifts liquid out of an oil well when there isn’t enough ground pressure to force the oil onto the surface. Oil pumps are used in onshore areas where oil is abundant, but the ground needs help releasing it. These pumps can deliver one to ten gallons of fuel with every stroke depending on the depth and the weight of the oil. Deeper extractions require more massive pumps to move the oil through a vertical discharge column (discharge head). A motor that drives the vertical motion to drive the pump shaft powers the pumps. The industry term for this movement is known as a ‘walking beam.’

Positive Displacement Pump

In contrast to centrifugal pumps, a positive displacement pump does not use impellers to move the fluid. Instead, they utilize rotating or reciprocating parts to push transport the liquid into an enclosed volume. This design creates pressure, which drives the liquid to its destination. A positive displacement pump is ideal for higher viscosity liquids that are transported at a lower flow rate but a higher pressure. An example of a positive displacement pump is a chemical injection pump.

Positive Displacement Pumps are utilized in the upstream phase of an oil refinery. They are a more compact unit, which increases the high-pressure ratio, making them among the most efficient types of pumps, as well as a low-cost solution. Despite their affordability and efficiency, positive placement pumps do require extensive maintenance, partly due to mechanical part failures. They’re also noisier than a centrifugal compressor, which could raise issues in certain applications. Positive displacement pumps are not typically used in situations that demand high flow rates.

Oil Transfer Pump

An oil transfer pump is used to transfer glycol from a well to a holding tank during the midstream and downstream phases of oil refinement. Due to the high volume of activity that an oil pump engages in, they require extensive maintenance and repairs to continue working correctly. Transfer pumps create a variation in pressure that pushes fluid from one location to another. Industrial-scale slurry pumps can operate on electric, solar, hydraulic, or gas power. Oil companies use transfer pumps to move flammable or corrosive liquids like oil, gas, or chemicals. These types of pumps are safe to use for these applications because the components are manufactured with corrosion-resistant metals that hold up well in hazardous environmental conditions.

Diaphragm Pump

A diaphragm pump is a type of positive displacement pump that uses both a valve and a diaphragm to draw oil and gas into a refinery chamber during the upstream and midstream phase of oil refinement. When the volume of a chamber increases, the pressure in the chamber reduces, and the fluid pours into the chamber. The diaphragm then moves down and forces the liquid out. Once the fluid has cleared the chamber, the diaphragm moves back into position, allowing more fluid to enter. This cycle continues while the pump is operating.

Due to their unique design, diaphragm pumps can transport large volumes of liquid and are ideal for refineries that are located over sizable oil sources. Diaphragm pumps are also far more wear-resistant than positive displacement pumps because they have fewer moving parts or friction points that wear down the components. However, diaphragm pumps do suffer from ‘winks’ – small gaps in the process that can slow down the flow of fluid. Winks and low pressure are likely to occur over long distances.

Petrochemical Pump

Petroleum products move from the upstream sector into the midstream sector of the petrochemical industry. The midstream sector transports and stores natural gas and crude oils. This is where the petrochemical pump comes in. Companies use these types of pumps to process or refine chemicals during crude oil drilling and refining. Petrochemical pumps can be piston pumps, diaphragm pumps, mag drive pumps, or another type of process pump or chemical pump.

Petrochemical pumps can operate at high rates of flow and pressure within a refinery system. One of the benefits of petrochemical pumps is that they prevent leaks; thus, they prevent hazardous environmental conditions. The simplistic design of the petrochemical pump, ease of use, and compactness give it the durability it needs to keep up with the demands of oil drilling. On the downside, petrochemical pumps can succumb to overheating, cavitations, and internal corrosion. Viscous, toxic, and corrosive fluids can also wear down the impellers over time.


Whether used during the upstream, midstream, or downstream phase, pumps give gas, oil, and other fluids enough energy to flow from one location to another. Centrifugal, oil, positive displacement, oil transfer, diaphragm, and petrochemical pumps are essential in delivering oil from the ground to a tanker, then to a refinery, and then on to storage. They are also useful for methanol injection, glycol pumping, chemical processing, gas sweetening, and water disposal. Pumps offer an efficient solution for transporting chemicals. Each type of pump explained above is integrated into a refining system for a specific purpose and are crucial in transporting or purifying different fluids.


pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Marine & offshore

Marine fire pump manufacturers

marine fire of pump manufacturers in china

Centrifugal pump use in marine of pump supplier in china

Marine fire pump, sometimes is called as marine Emergency pump or marine fire fighting pump. Usually it is a kind of centrifugal water pump. It is can be driven by a electrical motor or diesel engine. It can be named as emergency marine fire pump. Eu-FLOPUMP can offer quality marine fire-fighting pump in both electrical and diesel engine. 

Marine fire pump is rarely used. But they are relied upon on emergency situations. It is vital that a reliable and durable marine fire pump is in place. Marine centrifugal pumps are a popular choice for fire fighting applications. Because they have high flow capabilities,high pressure and ability to handle water and also foam. The worst thing that can happen to the vessel, ship or offshore platform is on fire. In the event, it is very important that sufficient water is available at sufficient pressure. For this purpose several marine fire fighting pumps are required. 

There are some the electrical motor marine fire-extinguishing pump or marine emergency pump on board. It is just similar to the ballast pump, water cooling pump, bilge pump and marine foam pump. Self-priming is usually necessary for the marine fire pump. The diesel engine marine emergency pump is the final method. When a vessel or ship is on fire and the main electrical source is noneffective. The main diesel engine marine fire pump is usually fixed on an upper deck floor of the ship, with big capacity. There is also a small marine emergency pump, which can be moved by hand. It is called portable emergency fire pump or rescue pump. It can be started by battery or by hand. The marine emergency pump can be also used as the marine foam pump.

The marine market requires expert solutions. We have a worldwide network that include shipyards, ship owners, contractors and other system suppliers for example fluid handling. Besides an impressive package of marine centrifugal pump and packing system, we can also supply customised solutions including complete electric control pannel, diesel engine marine pump and fire fighting systems including and operation. platform equipment.

eu-flo pumps and systems are widely used in various places of fire protection on board, If there is any critical application we can deliver a maximum reliable solution. Quality is guaranteed by international product certification and ISO9001. Different applications include:

Cargo and ballast handling systems

Engine rooms handling pumps

Bilge handling systems

Fire fighting systems

Eu-Flo PUMP is a reputation marine fire pump supplier and manufacturer in China. 

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Centrifugal pump use in metal smelting of pump manufacturers in china

Centrifugal pump use in metal smelting of pump supplier in china

Mineral Pump of Eu-flo

Mining Industry Pump

Whether on the surface or underground, the conditions in mines are harsh. Besides the mud, slurry, stones, and rocks, there are large volumes of water to remove in order to keep production moving. Eu-flo pump and other process equipment operate reliably in demanding mining applications, where durability and performance are key factors.


Mining Industry Pump

There are many applications for pumps in the mining industry. Centrifugal pumps, slurry pumps, submersible pumps, magnetic drive pumps and diaphragm pumps are just some of the pumps used in the mining industry.

Slurry Pumps

Slurry pumps are usually submersible pumps, peristaltic pumps or centrifugal pumps. They are used to transfer slurries, which can be thick and/or abrasive. One of the most abrasive slurries is produced in the process of benefaction. Pumps for acidic chemicals and abrasive slurries must be able to produce high flow rates and operate under high pressure.

Every situation is different and it is crucial to select the correct pump models and types if you want to create and maintain a high-efficiency pumping operation. It is also important to choose the right materials for rubber or metallic lining depending on application. At Pump Solutions china, our customer service staff has a great deal of knowledge about all of our product lines.

We can also provide access to dedicated customer service personnel from various pump manufacturers if needed for large projects.

Mine Dewatering Pumps

Simple submersible pumps can often be used for mine dewatering. Their advantage is that they can be submerged in water, thus ensuring that they are always primed. The water also acts as a cooling agent for the pump motors. The pumps are hermetically sealed, as are the power cords, to ensure that no fluids get inside of them.

Other Processes

We also carry a variety of pumps for mineral processing, reagent dosing, tailing, water supply, boosting and wastewater transfer.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Metal Smelting

Centrifugal pump use in metal smelting of pump manufacturers in china

Centrifugal pump use in metal smelting of pump supplier in china

Metal smelting Description

Steel mills are dependent on water for many areas of the plant operation. Water is used to quench and cool surfaces of steel throughout many stages of the steel fabrication process, through to rolling and forming. Steam is also used for heat treatment and power utility applications.

Some of the critical areas that must be focused on in order to ensure the reliable and efficient operation of the plant include:

  • Corrosion and fouling caused by suspended iron oxide particles
  • Rapid corrosion caused by oil and grease from steel handling equipment
  • Scale deposition on very high temperature surfaces (over 1,000°C)
  • Scale and suspended solids blocking cooling water spray nozzles
  • Suspended solids control in low velocity heat exchangers
  • Response to contamination of steam condensate
  • Management of boiler feed water purity
  • Separation of waste oil from waste water
  • Removal of COD and BOD from waste water before discharge
  • The water management programs developed by ZI-CHEM are based on global technologies that have been applied in the field for many years and refined to optimize and enhance results. These are delivered by dedicated and experienced field service teams that are based close to or inside the plant site to ensure attentive support and rapid responses are provided, so that the objectives of the programs are achieved.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Centrifugal pump use in pharmaceutical industry of pump manufacturers in china

Centrifugal pump use in pharmaceutical industry of pump supplier in china

Industrial pumps are widely used throughout the pharmaceutical industry to process, unload, mix and transfer liquids. Since a many different types of liquids need to be handled within the pharmaceutical industry, high-quality, efficient and versatile pumps are required. eu-flo Pumps carries a wide range of pharmaceutical pumps to meet these application requirements.

Our inventory of pharmaceutical pumps includes centrifugal, flexible impeller, diaphragm, rotary lobe and submersible pumps. Other pumps used in pharmaceutical applications include drum and container pumps, used to unload liquids efficiently, leaving little trace of liquid in the container. Stainless steel pumps are also frequently used for pharmaceutical applications due to their corrosion resistant and high-performing capabilities. Browse our pharmaceutical pumps below.

Common contaminants in pharmaceutical processing industries are water and airborne particles/ infections. In pharmaceutical environments, microbial, chemical and human contamination is the major source of contamination. Pharmaceutical industry follows one of the most stringent hygiene standards as compared to food, beverage and cosmetic industries. In the production of pharmaceuticals, hygiene and process reliability are crucial.

Centrifugal pumps are ideal for this kind of work because they are designed specifically to maintain product integrity and consistency. The advantages of using centrifugal pump are:

  • During restriction in liquid flow, a centrifugal pump will max out on the pressure at its dead-head pressure. This will not cause any damage to the system and it is easy to say able to work at medium to low head
  • Can deal with large volumes of liquid
  • Small in size, which saves a lot of space
  • Low capital cost
  • Easy maintenance
  • No danger creates if discharge v/v is closed while starting
  • Is able to work for medium to low viscous fluid
  • Continuous pulsation free delivery

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Centrifugal pump use in HVAC of pump manufacturers in china

Centrifugal pump use in HVACof Pump Supplier in china

The centrifugal pump has long been the workhorse of HVAC systems, supporting the operation of chillers, boilers, cooling towers, domestic water systems, and hydronic distribution systems. And while practically every other component in an HVAC system has been greatly modified to meet ever changing requirements for efficiency and reliability, centrifugal pumps have not changed very much.

That does not mean today’s centrifugal pumps are the same as those of 20 years ago. Manufacturers have made significant improvements in impeller designs, construction materials, bearing and seal designs, and couplings. But these changes have been more evolutionary than revolutionary. 

As a result, many managers simply overlook the pump as an opportunity to improve the performance and reliability of HVAC systems. Building designers replicate designs used in the past in new building designs or renovation plans. System operating practices simply follow past tried and true practices. And when pumps fail, technicians replace them with new ones with the same characteristics.

The situation is changing today. Many advances that have affected other areas of building HVAC operation are being applied to pumps and their operation. As a result, engineering and maintenance managers can achieve levels of operating efficiency that were unheard of as recently as 10 years ago. And while improved operating efficiency is a primary benefits of today’s pump installations, it is not the only one. System performance has improved. Reliability has increased. Maintenance requirements have been reduced.

Improving Pump Efficiency

The overall efficiency of any pump used in a building HVAC system is determined by a number of factors, including:

  • the efficiency of the pump and motor
  • the efficiency of the pump control
  • how well technicians maintain the pump and its related components.Enter the Intelligent ControllerPls do not Overlook Maintenance 
  • No matter how advanced the control system or how good the design, pump systems will operate effectively and efficiently only if managers schedule maintenance properly. Too often, though, they ignore maintenance until something goes wrong.

    The resulting costs from pump repairs and disruption to building operations typically exceed the cost of ongoing pump maintenance by a factor of 10 or more. Maintenance activities and the frequency with which they must be performed vary with the capacity of the pump and the nature of the load that it is serving. 

    One of the most important maintenance tasks is to pay attention to a pump’s operation. Does it look and sound normal, or has it developed unusual sounds or vibrations? Louder-than-normal or unusual sounds can indicate a range of problems, from misalignment and bad bearings to cavitation.

    A small leak rate at pump seals is normal, but a sudden flooding of the area near pump shafts indicates that a seal has failed and needs replacing. Excessive heat can indicate a failing bearing or a motor that might need replacing. By checking the pump regularly, maintenance technicians can identify pump problems early, reducing repair costs and disruptions to operations. Although it might be too late to prevent having to overhaul or replace the pump, at least the maintenance department, rather than the pump itself, will be able to pick the time when the pump is out of service.

    Beyond periodic checks on pump operations, maintenance personnel should follow the manufacturer’s recommended schedule of maintenance activities. But these are the minimum maintenance requirements. Pumps serving critical applications in a building will require additional maintenance activities if they are to enhance system reliability.

    A successful pump installation requires that managers change their ways of thinking about pumps. Sticking with old design and operating practices will prevent the system from operating as efficiently and reliably as it could, and waiting to adopt new technologies that are available means missed opportunities to ensure smooth building operation and enhanced energy efficiency.

  • While VFDs can greatly improve the energy efficiency and control effectiveness of pumping systems, manufacturers have developed a new generation of controls that goes even further. This new generation of pump controls — intelligent pump controllers — offers improvements in pump reliability while further improving system performance.

    Intelligent controls can better adjust to system load changes, better control pump operations, and provide control over a wider range of load conditions, and produce smoother pump startups.
    Intelligent controllers also use VFDs to regulate pump speed, but they do so not as a standalone device, but as another element in the overall building automation system. By connecting the pump and its controller to a digital field bus, data from the pump and its sensors can integrate into the system. Software monitors the operating conditions and identifies conditions that are outside normal operations and those that could damage the pump.

    For example, if the flow to a pump is restricted, the flow rate through the pump decreases. A conventional VFD control systems then signals the pump to increase its speed, possibly resulting in cavitation, a condition that can rapidly damage pump components. In contrast, an intelligent pump controller detects cavitation condition, notifies the operator of the situation, and — if programmed to do so — reduces the flow rate sufficiently to prevent cavitation without shutting down the system.

    Cavitation is just one condition that intelligent controllers can detect. Operators can program the software to detect abnormalities, from sticking control valves to system leaks. Technicians can use the system to identify recurring or intermittent problems that otherwise might go undetected.

  • New pump designs and high-efficiency drive motors can improve operating efficiency. For example, by replacing a pump motor with a high-efficiency model, managers can achieve a reduction in energy requirements of 1-5 percent. Similarly, installing a high-efficiency pump can reduce energy requirements 1-3 percent. While these efficiency improvement numbers are relatively small, the typical annual hours of operation for many pump applications can make the resulting savings very significant.

    While using higher-efficiency pumps and motors will improve operating efficiency somewhat, the greatest improvements in efficiency come from new designs of pump controls. Traditional pump installations use constant-speed pumps. Technicians use building, balancing, throttle or bypass valves to reduce flow when demand is low or to balance the flow to different areas of the building. 

    These valves restrict the flow of water through the end device, but the pump still uses the same amount of energy to operate. Also, technicians tend to set these valves and forget them. Conditions and loads change in a building, but the valve setting remains the same.

    An alternative to throttling flow that improves both performance and energy efficiency is the use of variable-frequency drive (VFD). VFDs have slowly gained acceptance in use with building HVAC pumps because of their ability to effectively control the operation of a pump over a wide range of flow requirements, while also significantly reducing the energy requirements for the pumping system.

    For example, as control valves cut back on the flow of water through terminal heating or cooling devices, the control system senses the reduced flow requirement and directs the VFD to reduce the pump speed to match the conditions found. Since the vast majority of systems operate at loads below peak capacity 95 percent of the time or more, VFDs can greatly reduce pumping energy requirements. In a typical HVAC application, pump energy savings typically are 20-50 percent annually.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump

Water Treatment

Centrifugal pump use in Industry water treatment of pump manufacturers in china

Centrifugal pump use in Industry water treatment of pump supplier in china

When the raw water is used for domestic or industrial water, it is called feed water treatment; 2) when the used wastewater is reused or discharged, it is called wastewater treatment, and the wastewater treatment generally includes domestic sewage water treatment and industrial sewage water treatment. The generalized water treatment includes the treatment and final disposal of  Waste water generated during the treatment, sludge and waste gas generated during the treatment. From the upstream and downstream of the industrial chain, the participants in the sewage treatment industry mainly include product and equipment providers (including sewage treatment chemicals, sewage treatment equipment, sewage pipe networks, testing instruments, etc.), engineering construction contractors and water service operators.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump

Power Plant

Centrifugal pump use in power plant of pump manufacturers in china

Centrifugal pump use in power plant of pump supplier in china

Power plant Pump type                                     

Critical water pumps Type used in the power station

In the steam cycle the steam passes through the turbine and produces electricity, and is then condensed in the main condenser. For a 660MW turbo-generator the heat rejected in the main condenser will be approximately 800MW. To remove this heat, and to condense the steam, requires a very high cooling water flow, which is provided by the Cooling Water pumps.

The condensate, after condensing in the condenser, collects in the condenser hot-well. From here it is extracted by the Condensate Extraction pumps, and pumped to the Deaerator which provides system storage and removes air from the feed water.

The condenser operates at a very high vacuum in order to extract the maximum possible efficiency from the Rankine cycle, and the surface pressure above the condensate in the hotwell is only about 6 to 8 kPa (absolute). For this reason, NPSH is a major consideration when specifying condensate extraction pumps.

From the deaerator the feed water is pumped into the boiler by the boiler feed pumps. These pumps are very high pressure multi-stage pumps. They usually have a booster pump to provide suction pressure for the main pump, and they are usually provided with variable speed drives to provide flow control.

Most boilers have a drum filled half by water and half by steam. There is a distinct water level which must be accurately controlled and maintained, and the boiler feed pumps carry out this function. In power plants with supercritical boilers there is no need for drum separation, and a different method of feed control is used. The trend is towards using supercritical boilers.

On the cooling side, where cooling towers are not used, environmental constraints are applied to ensure that the cooling water from the lake or sea is not heated above a pre-determined temperature, often 35 deg C. This helps to protect the marine eco-system. If the water discharge temperature approaches the allowable limit, either electricity production has to be curtailed, or an attemperating system installed.

An attemperating system consists of large pumps which draw water from the source, either a lake or the sea, and discharges it at the power station outlet to cool the heated water before it re-enters the lake. Attemperating pumps are usually large capacity low head axial flow type pumps.

Particular power station pumps:

cooling water pumps

The cooling water pumps supply large quantities of cooling water to the condenser to condense the steam into water. In a 660 MW Unit, the main cooling water pipes would be 2.0m to 2.6m diameter, and the cooling water flow would be up to 20 m3/s per Unit.

There are two general types of cooling water systems. The first is the once-through type, or open type, which draws water from a lake or the sea, and then returns it back to its source.

The second is the cooling tower type, or closed type, in which the water is recirculated through the condenser and pipework system, and then cooled in an evaporative cooling tower .

Pumps on cooling tower duties usually have a developed pumping head of about 20-23m, and those on a once-through system from a lake or the sea would have a developed head of about 10 to 15m, depending upon topography and the length and size of the conduits. The additional head for the cooling tower arrangement is required to pump the water to the hot well at the top of the cooling tower.

Once-through cooling systems are usually designed with a syphon through the condenser. Such syphons are often very high, and can be 8 to 9m of negative pressure at the high point.

Most CW systems would be provided with pumps in a 2 x 50% configuration. In single pump operation, due to the lower friction component, the pumps will run out on the curve. The system must be designed to ensure that sufficient NPSH is provided for this operating case to avoid cavitation, and also that sufficient submergence is provided to avoid air entrainment, swirling and flow disturbances in the sump.

Pumps used on circulating water duties are usually of the mixed flow or axial flow type, and are usually non-overloading with increasing flows beyond the best efficiency point (BEP).

The type of pump usually used are vertical spindle wet pit pumps, with a directly coupled motor on top as shown. Sometimes multi-pole motors are directly coupled, and in other cases a four-pole motor and reduction gearbox are used, although the gearboxes can add unnecessary complication. The pump would have a suction bell, mixed flow impeller and a diffuser for head development. The pump shaft would have a radial and thrust bearing at the top end, and a product-lubricated ‘cutless” rubber bearing at the lower end.

Depending upon the shaft length, there may be one or more line-shaft bearings, which are either grease or product lubricated. Bearings with oil systems are usually avoided where possible to avoid any possibility of pollution, particularly if the water discharges into a lake or the sea.

Vertical wet pit pumps are proven technology suitable for continuous operation, and usually run at fixed speed. They are very reliable and have the advantage that they can be pulled out without the need for isolation on the suction side. This is a distinct advantage.

Vertical wet pit pumps work best when there is only a small suction side water level variation, otherwise the column length would have to be increased to accommodate the lowest operating water level.

Most of the large CW pumps used at power stations have high efficiencies in the region of 88 to 90%, and for this reason should be preferred where possible.

Wet pit pumps can be susceptible to poor intake design, which may lead to rough running, higher power consumption and vibration. Sufficient space should be provided in the initial design layout of the power station to accommodate the intake if wet pit pumps are to be used, and the design requirements of the pump supplier should be followed.

Other pumps for cooling water duty

Both double-suction pumps and concrete volute pumps are also used for power station cooling water duty in Australia. Double suction pumps in horizontal or vertical configuration may be used up to approximately 5000 L/s, and a typical horizontal pump is shown in Fig 5. This type of pump has a long history of use on cooling water duty. For the larger pump sizes a smooth and straight flow profile into the pump is essential, and an adequate margin of NPSHA over NPSHR is essential, to suppress any potential cavitation.

A concrete volute pump is a bottom suction single stage volute pump with the volute cast directly in the concrete works. These are slow speed pumps that can attain high efficiencies and flow rates up to 30 m3/s. They are very reliable, and there are many instances where they are used in a single 100% installation with no standby pump, although this is not common practice in Australia.

Attemperating pumps

Attemperating, as previously described, is the process of cooling the heated water before it leaves the power station boundary. The aim is to keep below the required maximum discharge temperatures. These limits apply to water discharging to lakes, estuaries and to the sea, where strict environmental requirements need to be met.

Attemperating pumps are a part of the cooling water system in a power station. They do not usually pump through the condensers, and would therefore be of lower head than normal cooling water pumps.

Some power stations provide attemperating pumps as part of the initial station design, by providing up to 50% or more additional cooling water capacity to operate during the summer months.

Attemperating pumps are usually only needed through the summer period, and for NSW this means from the period from 1st December to 31st March each year.

In more tropical areas, attemperating pumps may be in operation for a substantial portion of the year.

Various types of pumps could be used for attemperating, although the basic requirement is for high volume pumping rates. They are usually, but not always, low head pumps, and they are very likely to be axial flow (propeller) type pumps. Such pumps are very susceptible to poor inlet conditions, and care must be taken with the pump intake design.

One suitable type are submersible pumps, which can be provided in an axial flow design. This type of pump has several good features as follows:

•   Inexpensive, and proven design,

•   Short manufacture period,

•   Ease of installation and handling,

•   Available in flow rates up to 5 m3/s or more.

Condensate water pumps

As indicated earlier a condensate pump draws water from the hot-well of a condenser. The water is usually warm, and at an absolute pressure of about 6 to10 kPa. The NPSH available to the condensate pump is generally in the range of 0.6m to 1.5m. Condensate pumps are usually multistage pumps, and fitted with a low NPSH first stage impeller, or a double-suction first stage impeller which has a lower NPSH requirement.

Many different types of pumps or pump combinations could be used on condensate duty, such as horizontal multi-stage pumps, vertical turbine pumps, and ring section pumps. All would have a low NPSH requirement on the first stage.

Condensate pumps are critical power station pumps, and would usually be installed in a 2 x 100% capacity arrangement.

Historically, condensate pumps were horizontal pumps with multiple stages, operating at low speeds. Due to the low pressure at the pump glands, air ingress was usually a problem, and water injection was used to seal the glands. Modern condensate pumps use mechanical seals, but still require water injection to avoid air ingress.

For flow regulation, fixed speed multistage pumps were regulated either by discharge control valves, or by using cavitation to control the flow. This latter type of control is generally referred to as ‘submergence control’ or self-regulation, and was once very common on condensate systems.

Submergence control for the condenser hot-well level is inherently automatic, since it requires no control equipment. The level in the condenser hot-well will be pumped down until the available NPSH is just equal to the NPSH required by the pump, and then the pump flow reduces.

This type of condensate flow control is not suitable for modern day condensate pumps.

Today large turbo-generators would most likely use the vertical ‘can’ type multi-stage pump . The ‘can’ allows the pump to capture the NPSH available, by inserting the pump into the basement floor into which the steel ‘can’ is inserted.

The sizing of condensate pumps requires some consideration. Whilst the flow required by the turbo-generator is known, there are occasions when the feed heating plant is bypassed, and under these conditions additional condensate goes to the condenser. The condensate pumps have to be able to pump these additional flows, which results in them often being oversized for their normal maximum duty by 30% or so.

Boiler feed pumps

The boiler feed system is the highest pressure section of the steam cycle. The boiler feed pumps draw water from the Deaerator storage tank, and pump it to the boiler.

Type boiler feed pumps are multistage pumps horizontal or vertical, and use mechanical seals, and usually have axial balancing devices such as a balance drum to help take the hydraulic thrust.

The larger turbo-generators very often use barrel type boiler feed pumps, with a bolted discharge head . Such pumps would usually have a removable inner cartridge assembly, which can be pulled out of the casing and replaced with a spare, making repairs and overhauls more efficient. The cartridge contains the impellers, diffusers, and shaft assembly.

There are, however, many different arrangements of boiler feed pumps, some of which use volutes instead of diffusers, and some with double suction first stage impellers, and opposed impellers arrangements for inherent balancing.

Smaller turbo-generators and industrial plants also use ring section pumps, where the entire cartridge assembly is held together by a series of exterior bolts.

Many installations use 3 x 50% boiler feed pumps, with two of the pumps being driven by steam turbines, and the third pump driven by electric motor. In such a case, the electric pump would act as the standby pump, and also be used for unit start-up from cold. On a 660MW turbo-generator, the electric motor for a 50% pump would be approximately 10MW in size. Steam turbines are variable speed, and drive the pump directly at its rated speed up to approximately 6000rpm.

Some power stations use a 100% steam turbine driven pump, with one or two 50% standby electrically driven pumps. There are many different combinations, and a detailed reliability and efficiency study is needed to determine the most cost effective arrangement.

For motor driven pumps, the motors would be 4 pole, and a step-up gearbox or variable speed hydro-coupling would be used to attain normal operating speed.

Speed control of motor driven boiler feed pumps using hydro-couplings is limited to the range 25 to 100%, and a control valve may be required if lower flows are required, for example during start-up, or periods of low load operation.

Boiler feed pumps require a booster pump to provide sufficient suction pressure, and the booster pump is usually driven by the same motor or turbine drive. Sometimes the booster pump may be appended to the non-drive end of the existing motor, or driven by an extension shaft from the non-drive end of the pump. In the latter case a reduction gearbox would be needed for the booster pump, to bring it back to 4 pole speed.

In some cases the booster pumps can have their own drive motor, the booster pump driven by the same turbine or motor that drives the main pump.

Each boiler feed pump would have its own separate leak-off line (minimum flow protection line), fitted with a throttling control valve. The leak-off line would open at all flow rates below approximately 20% of full flow.

Boiler feed pumps have close internal clearances, and require protection from grit and debris, by the provision of a filter usually situated before the booster pump.

The standby pump would need to be in readiness to start at any time, and would have its suction and discharge isolating valves open (and non return valve closed). The water temperature is about 190 deg C at this point in the cycle, and the pump must be pre-warmed and ready to operate.

                                                    pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump

General Industry

Pumps use in General industry of pump manufacturers in china

Pumps use in General Industry of pump supplier in china

General Industry Description

There are many general industrial processes around the world using pumps which are designed more for chemical and waste processing that lack the rigorous construction of a heavy-duty slurry pump. Fiber cement board production, pulp and paper mills, ethanol, biomass, sugar production (from either sugar beets or sugar cane), and many many more can benefit from the application of a severe duty slurry pump with materials of construction designed to handle the abuse of erosive and corrosive slurries!

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump