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Product code: North Ridge SNT-SP Long Coupled Self Priming Centrifugal Pump

North Ridge SNT-SP Long Coupled Self Priming Centrifugal Pump

Pump Type - Self Priming Centrifugal

Max Flow Rate - 1500M³H

Max Head - 100M

Max Temp - 140°C

Max Viscosity - 200 cst

Max Solid Passage - 0mm

Self Priming - Y

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

Inlet/Outlet Sizes - 32mm to 250mm

Drive - AC Electric, Engine, Bareshaft

Max Suction Lift - 8M

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DESCRIPTION

SNT-SP Long Coupled Self Priming Centrifugal Pump

 

The SNT-SP is the self-priming version of the SNT long coupled end suction centrifugal pump. Either an electric or air vacuum priming pump is fitted to the body to enable full self-priming capability. This variation has the full ability of the standard version; however, it can only be used for clean liquids such as sea water and fresh water containing no solid particles.

 

The SNT-SP long coupled, end suction, single stage horizontal centrifugal pump is standardised to EN 733/DIN 24255 and can be used for a vast range of applications in the industrial and marine markets. Common applications include energy plants, mining, firefighting, irrigation, water supply, water treatment, pressurisation, grey water, dewatering, building systems, ballast transfer, sea water general service, scrubber systems, marine and cooling/heating conditioning (HVAC).

 

This self-priming centrifugal pump is required when it is not possible to supply the inlet with fluid via gravity. This range is ideal for installations where the pump sits above the supply tank requiring a suction lift or where the inlet conditions are difficult such as long pipe runs. Priming is achieved by the main pump and the priming system working in tandem. They operate simultaneously, the priming device works by removing all the air from the inlet pipework, this draws the fluid into the body of the main pump, thus priming. A pressure switch then shuts down the priming device once the adequate pressure is achieved to enable to main pump to operate independently.

 

The electric or air powered priming options are down to customer preference, however the air vacuum version is better suited for installations with long inlet pipe runs or where long priming times are anticipated as this option can dry run for small periods of time without damage.

 

The long coupled horizontal centrifugal pump configuration has many benefits:

 

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.

 

Wear rings can be installed in the pump head, this is a sacrificial part that wears first protecting the impeller and casing from wear and prolonging the life of these parts and therefore the pump.

 

The long coupled horizontal centrifugal pump complies with DIN 24255 and EN733, this means that the pump is dimensionally the same as many other pumps on the market, this enables the replacement of most horizontal centrifugal pumps that are already installed.

 

Product summary

 

·         Self-priming horizontal centrifugal pump fitted with an air powered or electric priming pump

·         Can pump a wide range of clean low viscosity fluids

·         Back pull out design to ensure quick and easy maintenance

·         Maximum fluid temperature of 140°C

·         Independent pump and motor shafts

·         Available in cast iron, 316 stainless steel, duplex stainless steel, bronze 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

·         Casing wear rings to prolong casing and impeller life

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

·         Independent certification is available upon request

·         Manufactured in accordance with standard DIN24255 / EN 733

·         Casing wear rings to prolong casing and impeller life

·         Low NPSH

·         ISO 9905

·         Assembly without alignment

·         All impellers are balanced according to ISO 1940 class 6.3

·         Long coupled with baseplate

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

 

Flow Rate

Up to 1500m³/hr

Head (Pressure)

Up to 100m

Inlet/Outlet Sizes

DN32 to DN250

Operating Temperature

-10°C to +140°C

Drive Options

Electric Motor, Engine


FAQS

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.
Yes, this pump can be installed in a dry area above the sump if the suction lift height does not exceed 8m. A surface mounted pump has many benefits over a submersible pump, one main benefit being that it is easier the access and maintain the pump.
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. 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.
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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