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Product code: XHD / VXHD

XHD / VXHD Single Stage Waste Water and Process Centrifugal Pump

Pump Type - Centrifugal

Max Flow Rate M³H - 1600 M³H

Max Head - 95M

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

Max Temp - 110°C

Max Viscosity - 200 cst

Max Solid Passage - 50mm

Self Priming - N

Inlet/Outlet Sizes - 40mm to 300mm

Drive - AC Electric, Engine, Bareshaft

Max Suction Lift - 4M

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DESCRIPTION

XHD / VXHD Single Stage Waste Water and Process Centrifugal Pump

Flow Rate	Up to 1600m³/hr
Head (Pressure)	Up to 95m
Inlet/Outlet Sizes	DN40 to DN300
Operating Temperature	-10°C to +110°C
Drive Options	Electric Motor, Engine

The XHD / VXHD end suction, single stage waste water and process centrifugal pump can be used for many applications in the industrial and domestic markets involving the transfer of waste water, sewage and many other fluids that contain suspended solids or fibrous content. Common applications include chemical, energy plants, mining, water treatment, grey water, dewatering. The horizontal version is the XHW series and the vertical version is the VXHD series.

The single stage waste water centrifugal pump configuration has many benefits:

There are several impeller types to suit most applications, these include; closed, semi open and vortex.

Capable of high flow rates up to 1600m°/hr and large solids passage capability.

The long coupled design is very easy to maintain as it is possible to access the pump head without removing the motor. This centrifugal pump is also more robust and designed for continuous use as additional bearings are installed in the pump head, these take a large deal of strain away from the motor during operation.

The back pull out design allows the motor to be removed while the pump is still connected to the pipework, this in turn allows time saving while the pump is serviced/maintained.

The centrifugal pump and motor have independent shafts, this means that only the pump shaft will need to be replaced in the event of it breaking. Other less robust horizontal centrifugal pumps on the market only use the motor shaft, this means that if the shaft breaks, the entire motor needs to be replaced.

The long coupled design means that there is a large space between the pump and motor, this in turn protects the motor from fluid ingress in the case of a seal failure.

The XHD / VXHD single stage waste water and process centrifugal pump is also available in an ATEX version for handling flammable fluids or being installed in a non-safe area.

Product summary

· Can handle fluids containing suspended solids and fibrous content

· Several impeller options including; closed, semi open and vortex

· Large solids passage capability

· Back pull out design to ensure quick and easy maintenance

· Maximum fluid temperature of 110°C

· Independent pump and motor shafts

· Available in cast iron, cast steel and other materials upon request

· Suction and discharge flanges conform to EN 1092-2 / PN 16. Flanges according to EN 1092-1 / PN 16 for steel and stainless steel casings. 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

· Low NPSH

· All impellers are balanced according to ISO 1940 class 6.3

· Long coupled with baseplate

· Bearings are normally life time grease lubricated bearings, although certain sizes are oil lubricated

FAQS

Can this pump run dry?

No, definitely not! Centrifugal pumps will incur damage even after short periods of dry running. The mechanical seal requires lubrication and cooling while the pump is operating. Without the presence of fluid, the mechanical seal will overheat and crack, and this may cause the pump to leak and fluid to enter the motor. 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 a member of our sales team and we will 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 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.

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.

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.