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Product code: NRSD

NRSD Horizontal Self-Priming Side Channel Pumps

Name: NRSD Horizontal Self-Priming Side Channel Pumps
Brand: North Ridge

Pump Type - Side Channel

Max Flow Rate - 42M³H

Max Head - 400M

Pump Materials - Cast Iron, Stainless Steel, Ductile Iron

Max Temp - 220°C

Self Priming - Y

Inlet/Outlet Sizes - 20mm to 20mm, 32mm to 32mm, 40mm to 40mm, 50mm to 50mm, 65mm to 65mm

Drive - AC Electric, Engine

Max Suction Lift - 7.4M

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DESCRIPTION

NRSD Horizontal Self-Priming Side Channel Pumps

The NRSD pumps are part of the North Ridge S Series – a range of cast horizontal self-priming side channel pumps.

They are designed to handle hazardous clean fluids without the presence of solids, which may contain entrained gas. Liquids typically handled by this range of pumps include low viscosity oil’s, chemicals, and refrigerants which are handled under pressure or at low temperatures to prevent gasification. They are also utilised for clean non-hazardous fluids which may be transferred at low flows and high pressures such as fresh water and seawater in pressure booster applications.

Assembled utilising 2 different impeller designs, both work in conjunction helping the pump to behave in a unique way and similar to a standard centrifugal and multistage pump.

A star shaped side channel impeller enables the handling of entrained gas with solid particles in suspension up to 0.5mm in size and the centrifugal impeller housed at the suction port acts as an inducer helping the pump to prime up to 7.4M. Both ensure the pump has a low NPSH and that liquids with up to 50% entrained gas are handled efficiently without causing vapour locking.

A NPSH inducer stage also allow the pump to operate with lower than 0.5m of NPSH enabling the unit to completely empty tanks, and handle volatile fluids being transferred close to their boiling point. Its design allows for efficient operation, as well as being easy to maintain guaranteeing long-lasting reliability.

The NRSD range are completely customisable with materials of construction altered according to application, with stages added or subtracted according to desired pressure or flow.

The North Ridge S Features

· High Self Priming Capability

· Extremely low NPSH <0.5M or Less

· Handle liquids with up to 50% entrained gas

· ATEX Certified

· Eliminates the requirement for expensive infrastructure when handling liquid gases.

· Modular design reduces spare part holding and enables pumps to be scaled according to process needs

· Multiple sealing options

Product Summary

· Side channel design

· Designed to handle liquids, gases, and liquid-gas mixtures with up to 50% vapor

· Low NPSH Requirement typically 0.5M

· Self-priming up to 7.4M

· High pressure at low capacity

FAQS

What does the term side channel mean?

A side channel pump is a cross between a centrifugal and positive displacement pump. Side Channel pumps are self-priming and capable of handling entrained gasses and can produce high pressures but low amounts of flow. They are available with single impeller or multiple impellers depending on the pressure required. A few of the benefits of this pump type are; low NPSH required, high efficiency, Balanced radial thrust ensures low wearing parts, excellent self-priming capability and handling of up 50% gas content.

What does the term self-priming mean?

A pump must be primed in order to operate correctly, this means that the pump casing and inlet pipe must be filled with fluid and the air removed before operation. This needs to be done manually by the pump operator for a non-self-priming pump each time the pump is used to avoid damage from dry running. A self-priming pump removes these issues by completing the priming process automatically. The air is removed from the inlet pipework and pump casing when the pump is activated. Self-priming pumps are particularly useful for installations with a suction lift on the inlet side of the pump, the pump will draw the fluid up the pipework by creating a vacuum and removing any air that is present. In ideal conditions, a self-priming pump can lift fluids up to around 8m on the inlet side, however this figure is affected by fluid viscosity, pipework bore and other installation conditions, therefore this figure can be much lower from case to case. Allowances must also be made for wear and tear; suction lift capabilities will be much lower for older and worn pumps.

Can this pump handle solids?

Side channel pumps cannot handle solids, all fluids entering the pump must be clean and free of particles.

What percentage gas content can this pump handle?

Due to their unique design, Side channel pumps are capable of handling fluids containing up to 50% gas content.

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.

Which sealing option is correct for my application?

These pumps are available with single mechanical seal, double mechanical seal or magnetic drive. It is best to speak to a member of our sales team if you are unsure which sealing arrangement is best for your application.

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.