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Product code: DM

North Ridge DM Chemical Magnetic Drive Centrifugal Pump

Name: North Ridge DM Chemical Magnetic Drive Centrifugal Pump
Brand: North Ridge

Pump Type - Magnetic Drive

Max Flow Rate - 35M³H

Max Head - 24M

Pump Materials - PP, PVDF

Max Temp - 95°C

Max Viscosity - 150 cst

Max Solid Passage - 0mm

Self Priming - N

Inlet/Outlet Sizes - 25mm to 50mm

Drive - AC Electric, Bareshaft

Max Suction Lift - 0

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DESCRIPTION

DM Centrifugal Magnetic Drive Pump

Flow Rate	Up to 35m³/hr
Head (Pressure)	Up to 24m
Inlet/Outlet Sizes	1” to 2”
Operating Temperature	Up to 65°C (PP) Up to 95°C (PVDF)
Viscosity	Up to 150cp
Drive Options	Magnetic Drive, Electric motor

The DM series of chemical centrifugal magnetic drive pump is designed for the transfer of clean chemicals up to a viscosity of 150cp. There are 4 models of pump within this range and the various sizes can cover flow rates up to 35m³/hr and heads up to 24m.

The low maintenance magnetic drive design ensures that there are no possible chemical leaks. The pump is seal less, this negates the concerns normally attributed to mechanically sealed pumps.

The casing of this heavy duty magnetic drive pump is constructed from solid block polypropylene or PVDF depending on application requirements. The solid block casing has no welds like other chemical pumps, this makes it extremely resistant to the strongest of acids and alkalis as there are no weak points on the casing.

The combination of a solid casing seal less design and casing material options make this range capable of handling the most aggressive of chemicals.

Applications for this centrifugal chemical pump include; mechanical and metalworking industry, ceramic industry, waste water treatment, textile industry, automotive industry, paint industry, cosmetic industry and the cleaning industry.

This magnetic drive pump is available with an Atex zone 2 motor if required for operation in non-safe potentially flammable environments.

Product summary

• Seal less design

• Solid block casing available in PP or PVDF with no welds

• Suitable for aggressive chemicals

• Viscosity up to 150cp

• Single or Three phase motor options in either IEC or NEMA

• Atex Zone 2 motor available

• Low maintenance

FAQS

What is a magnetic drive and what are the benefits?

A magnetic drive is a means of sealing a pump without the requirement of a mechanical seal. Magnets are used to transfer torque from the motor shaft to the shaft within the pump head. There are many benefits of sealing the pump in this fashion, including;
• A mechanical seal does not need to be regularly replaced due to wear and tear, this greatly reduces maintenance costs.
• A seal flush is not required for seal lubrication.
• The fluid is fully contained within the pump, this means there are zero chances of leakage. This is a great benefit when handling hazardous and corrosive products.

Can this pump run dry?

No, definitely not! Magnetic drive pumps will incur damage even after short periods of dry running. 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 fluid; 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 size pump and motor speed is correct for my application?

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.

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 and o-ring. It may be that more than one material is suitable for your fluid and selection could be based on the application type. If it is a simple transfer application with a clean less corrosive fluid, then the most cost-effective material will be best. However, if it involves more complex variables such as high temperature and the fluid is highly corrosive then other materials will need to be considered.

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.