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Product code: SKY

North Ridge SKY Single Stage Centrifugal Thermal Oil Pump

Pump Type - Centrifugal

Max Flow Rate - 350M³H

Max Head - 105M

Max Temp - 350°C

Max Viscosity - 500 cst

Max Solid Passage - 5mm

Self Priming - N

Pump Materials - Cast Iron, Cast Steel, Ductile Iron

Inlet/Outlet Sizes - 32mm to 125mm

Drive - AC Electric, Engine, Bareshaft

Max Suction Lift - 8M



SKY Single Stage Centrifugal Thermal Oil Pump


Flow Rate

Up to 350m³/hr

Head (Pressure)

Up to 105m

Inlet/Outlet Sizes

DN32 to DN125

Operating Temperature

Up to 350°C

Drive Options

Electric Motor, Engine


The SKY end suction, single stage centrifugal thermal oil pump can be used for thermal oil that is free of solid particles. Common fluids pumped include thermal oil, heat transfer oil, bitumen and low viscosity high temperature industrial oils and common applications include steel plants, plastic manufacturing facilities, heat transfer circulating systems, and the rubber and wood processing industry for boiler feed.



The centrifugal thermal oil pump design has many benefits:


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.

This thermal oil pump is air cooled meaning no additional cooling device is required.

It is fitted with a high temperature resistant mechanical seal allowing it to pump fluids as high as 350°C

The bearings are greased for life.



Product summary


·         Can pump a wide range of  low viscosity high temperature oils

·         Suitable for thermal oils including, Mobiltherm, Paratherm, Duratherm, Multitherm, Dowtherm and Marlotherm

·         Back pull out design to ensure quick and easy maintenance

·         Maximum fluid temperature of 350°C

·         High temperature resistant mechanical seal

·         Air cooled

·         Bearing are greased for life

·         Independent pump and motor shafts

·         Suction and discharge flanges conform to EN 1092-2 / PN 16.

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

·         Independent certification is available upon request

·         Low NPSH

·         Standardised to EN ISO 9905

·         All impellers are balanced according to ISO 1940 class 6.3

·         Long coupled with baseplate


Thermal oils carry heat at very high temperatures from one location to another. They are typically preheated to between 180°C and 280°C by various methods, including; resistance or by a burner. Thermal oils are known by various other names, including thermal transfer oils, heat transfer oils or HTF. Common heat transfer oils include; Mobiltherm, Paratherm, Duratherm, Multitherm, Dowtherm and Marlotherm. Due to their high temperatures, thermal oils are typically very low viscosity and therefore easily handled by a high temperature rated centrifugal pump.
No, definitely not! Centrifugal 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.
Our SKY range of thermal oil pumps are capable of handling oils up to 350°C making them excellent for hot oil applications.
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.
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. Please speak to us if you are unsure and we will try our best to help.
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.
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.
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.


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