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Product code: DV

North Ridge DV Vertically Immersed Progressive Cavity Pump

Name: North Ridge DV Vertically Immersed Progressive Cavity Pump
Brand: North Ridge

Pump Type - Progressing Cavity

Max Flow Rate - 600M³H

Max Head - 480M

Pump Materials - AISI304, AISI316, Cast Iron, Duplex

Max Temp - 150°C

Max Viscosity - 1,000,000 cst

Max Solid Passage - 30mm

Self Priming - Y

Inlet/Outlet Sizes - 25mm to 300mm

Drive - AC Electric, Bareshaft

Max Suction Lift - 8M

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DESCRIPTION

North Ridge DV Vertical Immersed Progressive Cavity Pump

Flow Rate	Up to 600m³/hr
Head (Pressure)	Up to 48 bar
Sizes Available	From 025 to 300
Operating Temperature	-40°C to 150°C
Viscosity	Up to 1,000,000cp
Drive Options	Electric Motor, Hydraulic Motor

The North Ridge DV series of vertically immersed progressive cavity pump is designed for installation in deep wells and tanks. This vertically immersed pump is excellent at transferring high viscosity fluids and fluids containing solids in suspension.

The column length is customisable depending on application requirements. The long version requires an additional cone bracket at the end of the column to ensure the pump is stable and to avoid any unwanted vibrations. This vertically immersed positive displacement pump is capable of achieving flow rates up to 600m³/hr and pressures up to 48 bar.

The casing of this vertical positive displacement pump can be constructed from various materials including cast iron, stainless steel 304, stainless steel 316 and duplex stainless steel. The rotor is available in stainless steel 420, 304, 316 and duplex, while the stator can be supplied in NBR, EPDM, FPM, HNBR, Hypalon and PTFE. Such a wide range of material choices makes this pump series extremely versatile and capable of pumping a vast range of fluids.

Sealing options for this vertical helical rotor pump include gland packing, gland packing with flushing, single mechanical seal, single mechanical seal with quench, double mechanical seal, single or double cartridge seals and API rated sealing systems.

This vertical progressive cavity pump is Atex certified for handling flammable fluids and installation in non-safe areas. API 676 certification is also available if required.

This vertical progressive cavity pump is ideal for many applications in the industrial and marine markets, including; fuel transfer, oil transfer, sewage transfer, bilge water transfer, bio-waste, waste water transfer, sludge transfer, marine and agriculture.

Product summary

• Vertically immersed progressive cavity pump

• Specifically designed for deep wells and tanks

• Wide range of material options

• Can handle viscous fluids up to 1,000,000cp

• Excellent at pumping fluids containing solids in suspension

• Modern sealed stator design, no o-ring required

• Modern rubber sleeve design to improve resistance to abrasive solids

• Numerous sealing options, including; gland packing, gland packing with flushing, single mechanical seal, single mechanical seal with quench, double mechanical seal, single or double cartridge seals and API rated sealing systems.

• Incorporated bearing lubrication system

• Excellent self-priming capability

• Reversible flow up to 3 bar as standard, Up to 12 bar with hydraulic balance

• Excellent for shear sensitive fluids due to low pulsations

• Single phase and three phase 50hz / 60hz motors

• Available in different versions including flanged, vertical, hopper, oenological hopper and portable for wine transfer.

• Marine certification available

• ATEX, API676, food grade EHEDG certifications available

• Various accessories available, including; dry running protection, bypass valve, control panel, inverter, heating jacket, grinder and others on request

Read how Progressing Cavity Pumps work and the types available in our Guide

FAQS

Can this pump run dry?

No, definitely not! Progressive pumps will incur damage even after short periods of dry running. Firstly, the stator and rotor require lubrication from the pumped fluid. Dry running without these will cause fast and irreversible damage. 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 always has access to fluid while running, the vessel or sump on the inlet side of the pump must never run out of fluid while the pump is active. Level sensors or a float switch can be installed in the fluid chamber ensuring that the pump is turned off in the event there is no fluid. 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.

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.

What viscosity can this pump handle?

Please be aware that the figures displayed relate to the largest pump from this range of products, not specific models. For details on viscosity for specific models, please refer to datasheets or contact a member of our sales team.

What size solids and percentage dry matter can this pump handle?

Please be aware that the figures displayed relate to the largest pump from this range of products, not specific models. For details on solids passage and dry matter content for specific models, please refer to datasheets or contact a member of our sales team.

What is a hopper and do I need one?

A hopper is a wide opening at the top of the pump, it is designed to help feed viscous, sticky, dry, pasty and solids laden fluids into the pump easier than just via standard pipework. Our hoppers are customisable; they can be manufactured to various shapes and sizes, they can also be fitted with various types of feeding systems, including auger screw and paddle.

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, viscosity, size and type of solids, 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 slower speed motor rather than a full speed 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, stator, rotor, 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. If it is a simple transfer application with a clean fluid, then the most cost-effective material will be best. However, if it involves more complex variables such as high temperature and abrasive solids then other materials will need to be considered.

How does a bypass work and do I need one?

An integral bypass is designed to protect the pump and system from overpressure for small periods of time. It is typically set to around 10% higher than the working pressure, it will open and recirculate the fluid inside the pump head when the set pressure is achieved. An integral bypass is only a temporary solution and cannot operate indefinitely, an additional external bypass that runs back to the fluid source is always recommended as a more permanent solution.

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.