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Product code: XVM

XVM Vertical Centrifugal Multistage Pump

Pump Type - Multistage

Max Flow Rate - 400M³H

Max Head - 450M

Pump Materials - AISI304, AISI316, AISI316L, Bronze, Cast Iron, Cast Steel, Ductile Iron, Duplex, NiAl Bronze, Super Duplex

Max Temp - 140°C

Max Viscosity - 200 cst

Max Solid Passage - 0mm

Self Priming - N

Inlet/Outlet Sizes - 32mm to 150mm

Drive - AC Electric, Bareshaft

Max Suction Lift - 8M

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DESCRIPTION

XVM Vertical Centrifugal Multistage Pump

Flow Rate	Up to 400m³/hr
Head (Pressure)	Up to 450m
Inlet/Outlet Sizes	DN32 to DN150
Operating Temperature	-10°C to +140°C
Drive Options	Electric Motor

The XVM vertical centrifugal multistage pump can be utilised for a wide range of applications in the industrial and marine markets. This vertical multistage pump is designed to pump low viscosity clean or slightly contaminated fluids without the presence of solid or fibrous particles. Common fluids pumped include fresh water, sea water and fuels (diesel, petrol and kerosene) and common applications include boiler feed, chemical, energy plants, mining, fire fighting, reverse osmosis, water treatment, pressurisation, dewatering, building systems, marine and cooling/heating conditioning (HVAC), petroleum, irrigation and water supply.

This vertical multistage pump is capable of high pressures up to 45 bar and flow rates of up to 400m³/hr and is also very robust due to additional bearings being installed in the pump head, these remove strain away from the motor during operation.

The vertical multistage design has many benefits:

There are several options for flange configurations making it versatile when installing on sites with difficult pipework layouts.

Vertical compact design for sites with space limitations.

Multiple closed impellers and diffusers are installed to allow it to achieve very high pressures.

This multistage pump has a maximum casing pressure of 63bar.

It is fitted with sacrificial wear rings which are replaced periodically, this means the casing and impellers are protected from premature wear.

The XVM vertical centrifugal multistage pump is also available in an ATEX version for handling flammable fluids or being installed in a non-safe area.

If required, the XVM vertical centrifugal multistage pump can be supplied with an external air powered or electric priming pump for applications where a suction lift is unavoidable.

Product summary

· Can pump a wide range of clean low viscosity fluids

· Various different flange configurations with the suction and discharge flanges available one the side, on top or on opposing sides.

· Vertical compact multistage design

· Maximum fluid temperature of 140°C

· Independent pump and motor shafts

· Fitted with sacrificial wear rings which are replaced periodically

· Available in cast iron, 316 stainless steel, duplex stainless steel, bronze and other materials upon request

· Suction flanges conform to EN 1092-2 / PN 16 and the discharge flanges according to EN 1092-2 / PN 40 (PN 63). If required, ANSI/ASME flanges can be supplied.

· Gland packing or mechanical seal options available

· Single phase and three phase 50hz / 60hz motors. IP55 as standard.

· ATEX version upon request

· Independent certification is available upon request

· Manufactured in accordance with standard BB4 / EN ISO 9905

· All impellers are balanced according to ISO 1940 class 6.3

· Long coupled with baseplate

· Bearings are greased

· Can be supplied with an air powered or electric priming pump

FAQS

How do I know what size pump and motor speed is correct for my system?

A clear picture of the pump system is required to make an accurate selection. The main pieces of information required include; a description of the application, bore of pipework, the fluid, flow rate and pressure/head. With these pieces of information, a pump can be sized correctly to ensure it delivers the required flow rate and pressure and that is also operates at its best efficiency point to lower lifetime costs. Knowing if the pump is running intermittently or continuously also allows the correct motor speed to be selected. For instance, a pump running continuously 24/7 will require a 4 pole motor rather than a 2 pole motor. Running the motor slower and oversizing the pump will reduce wear of the motor and the pump, therefore lowering maintenance costs during their lifetime.

What does the term multistage mean?

Centrifugal pumps typically have only one impeller, whereas a multistage pump has multiple impellers or stages of impellers back to back. Installing the impellers in this way allows the pump to generate much higher pressures. Multistage pumps are perfect for applications that require higher pressures or a combination of high pressure and low to medium flow rates.

Can this pump run dry?

No, definitely not! multistage pumps will incur damage even after short periods of dry running. The mechanical seal will be destroyed, and this will cause the pump to leak. There is also the possibility that the motor will burn out. Our advice is to ensure that the pump has a flooded suction or always make sure that the pump casing and inlet pipe are filled with water; one way of ensuring this is to fit a check valve on the inlet line to stop water escaping when the pump is inactive. Another way of protecting the pump is to fit a dry running device, this will turn the pump off if it detects that no fluid is entering the pump. If you think that dry running is inevitable, then please speak to us and we will try to select a more suitable pump for your application.

How do I know what pump materials are correct for my application?

Firstly, always check the compatibility of the materials available against the fluid being pumped. The main materials to check are the pump casing, impeller, o-ring and mechanical seal. It may be that more than one material is suitable for your fluid and selection could be based on the application type. For instance; cast iron, bronze and stainless steel are all suitable for fresh water. If it is a simple transfer application, then the most cost-effective material cast iron will be best. However, if it is a sanitary application, then stainless steel or bronze are better choices.

What is NPSH and why is it so important?

NPSH is an acronym for Net Positive Suction Head. NPSH measures the absolute pressure present in a fluid.

There are two main ways that NPSH is expressed in a pump system

NPSHa - This is the amount of Net Positive Suction Head available at the pump inlet. NPSHa demonstrates the amount of pressure acting on a fluid as it enters the pump. This measures the amount of pressure between the liquid staying in its current state and forming vapour bubbles (beginning to boil).

NPSHr - This is the amount of Net Positive Suction Head that the pump requires to operate without experiencing the damaging effect of cavitation, thus causing a dramatic reduction in pump performance.

It is very important to pay attention to these values when making a pump selection. Selecting a pump that requires more NPSH than is available in your system will cause fast and long-lasting damage to the pump and thus you will incur large repair costs and downtime.

What does the term best efficiency point (BEP) mean and why is it so important?

The best efficiency point or BEP is a point along the pump performance curve that indicates where efficiency for the pump peaks. When selecting a pump, you must try and get as close to the BEP as possible to ensure that the pump is at maximum efficiency when operating. The closer to the BEP the pump is when operating, the lower the energy costs will be, thus saving significant amounts of money during the pump’s lifetime. Also, vibrations will be at their lowest meaning maintenance costs are lower and the lifespan of the pump is maximised. It is very important to pay attention to the BEP when your pump is selected, as an oversized or undersized pump could cost you significant amounts of money.

What do the terms Atex and explosion proof mean and why are they so important?

ATEX is an abbreviation of “Atmospheres Explosibles”. It is a regulation set out by the European Union to ensure the safety of products that are used to handle flammable products or are installed in environments containing flammable gases, vapours, mists or combustible dusts. For instance, if the pump is being installed in an explosive environment, then only the motor needs to meet the Atex standard stopping it from causing a spark during operation and igniting the atmosphere. However, if the fluid being pumped is flammable, then the pump will also need to meet Atex standards to ensure that no sparks are caused inside the pump itself when the fluid goes through it. It is crucial that an Atex rated pump or motor are used for applications involving explosive environments or flammable fluids, using a non-Atex pump or motor in these situations is extremely dangerous and contravenes health and safety standards.