Basics of Pump Assessment

The work performed by a pump is a function of the total head and of the weight of the liquid pumped in a given time period. Pump shaft power (Ps) is the actual horsepower delivered to the pump shaft. It can be calculated as follows:

Pump Shaft Power (Ps) = Hydraulic power (hp) / Pump efficiency (ηpump)

Pump Efficiency (ηpump) = Hydraulic power / Pump shaft power (Ps)

Pump output, water horsepower or hydraulic horsepower (hp) is the liquid horsepower delivered by the pump, and can be calculated as follows:

Hydraulic Power hp = Q (m3/s) x (hd - hs in m) x ρ (kg/m3) x g (m/s2) / 1000

            Where:

            Q = flow rate

            hd = discharge head

            hs = suction head

            ρ = density of the fluid

            g = acceleration due to gravity

Difficulties in Pump Assessment

• Absence of pump specification data to assess pump performance - Pump specification data are required to assess the pump performance. Most companies do not keep original equipment manufacturer (OEM) documents that provide these data. In these cases, the percentage pump loading for a pump flow or head cannot be estimated satisfactorily.
• Difficulties in flow measurement and flows are often estimated - It is difficult to measure the actual flow. The methods are used to estimate the flow. In most cases the flow rate is calculated based on type of fluid, head and pipe size etc, but the calculated figure may not be accurate. Another method is to divide the tank volume by the time it takes for the pump to fill the tank. This method can, however, only be applied if one pump is in operation and if the discharge valve of the tank is closed. The most sophisticated, accurate and least time consuming way to measure the pump flow is by measurement with an ultrasonic flow meter.
• Improper calibration of pressure gauges & measuring instruments - Proper calibration of all pressure gauges at suction and discharge lines and other power measuring instruments is important to obtain accurate measurements. But calibration has not always been carried out.  Sometimes correction factors are used when gauges and instruments are not properly calibrated. Both will lead to incorrect performance assessment of pumps.

If you have any queries regarding pump assessment, feel free to get in touch with Darling Pumps. Our ability to integrate different systems to provide customized technical solutions has made us the leader for custom pumping solutions in India. 
For further details, visit www.darlingpumps.in or call +91 99819 92838.

Why does Pump Motor Burn?

Pumping systems account for nearly 20% of the world’s electrical energy demand. Furthermore, they account for 25-50% of the energy usage in certain industrial plant operations. The use of pumping systems is widespread. They provide domestic, commercial and agricultural services. In addition, pumping systems provide municipal water and wastewater services, and industrial services for food processing, chemical, petrochemical, pharmaceutical, mechanical and other industries.

Problems Faced with Pump Motor

When a pumping motor has been installed properly, it can run for several years with minimal maintenance. One of the most commonly faced problems is failure of pump motor. There is a common misconception that motor fails due to voltage. But, it needs to be understood that motor does not fail because of voltage, in fact it burns because of current.

•          Over Load – Voltage fluctuations, mechanical and electrical malfunctioning, phase failure (single phasing). 
•          Under Load - Dry run, reverse rotation, mechanical failure, phase failure (single phasing)

To safeguard pump motor, we can monitor and control the current variation for its higher and lower allowable value.

Why it is critical to use control panel along with the pump?

A reliable & proper control panel is very critical for proper running of any pump set. A pumping motor does not understand -

• When it is under load.
• When it is running in reverse direction.
• When it is getting over heated.
• When it is running dry
• When it is getting overloaded

By adding a control panel to the system -

·         You can ensure consistent & stable electric supply that is not within our control under normal setup.

·         Pump by itself is not an intelligent device & panel, in turn, acts as an intelligent device of the pump.

Darling Control Panel is designed with advanced technology based system. It is safe and complete failure proof solution for long life, trouble free and continuous pump operation. Darling Control Panel positively monitors and controls current variations and safe guard’s pump set during those critical moments.

Different Types of Control Panel –

• Direct Online (D.O.L)
• Star delta (Y-Type)
•  Auto transformer (A.T.S)

For further details on submersible pumps and pump control panels, visit www.darlingpumps.in or call +91 99819 92838.

Pumping Solutions for Power Sector

The demand for energy continues to increase around the globe. High growth rates, economic development & heavy investment in infrastructure sector in Indian Subcontinents & Asia region has put these countries on global radar. Demand on energy in these areas has increased tremendously. To meet this demand many new power plants are coming up.  Refurbishment of old plants also takes up in big way.

The power sector consists of generation, transmission and distribution utilities and is crucial component of India’s infrastructure. India’s rapid growth in past decade has increased power demand which is still largely unmet.

The Power Sector in India is currently in the developing stage and supports the growth of other sectors such as:

•        Infrastructure,

•        Manufacturing,

•        Commercial enterprises

•        Railways and more

Therefore it is key enabler for India’s economic growth and has historically shown similar growth trends as compare to the economy.

Darling Pumps is a renowned supplier of raw water submersible pumps in India.

With their experience and continuing presence in various power plants can add value in handling following applications in power plants -

• Condensed water pumps

• Cooling water circulation pumps

• Cooling water make-up pumps

• Drain pumps

• Service water pumps

• Slurry handling pumps for AHP/CHP

• Dewatering pumps

• In-take water pumps

Darling   Pumps is an ISO 9001:2008 Company, having CE Certification, a leading manufacturer of submersible pumps under the brand name of “DARLING”. We have been manufacturing various types of Submersible Pumps for last 30 years. Darling Pumps with its extensive basket of pumps, from Clear Water Pumps to Slurry Handling pumps, is better  placed to cater to exacting needs of pumping solutions require in various power plants like:

• Coal fired,

• Nuclear,

• Hydel

• Combined cycle power plants

To know more about submersible pumps in india by Darling Pumps, visit http://darlingpumps.in/ or call +91 99819 92838.

Submersible Pumps – Understanding the Basics

Pumps in itself is a very complex subjects to understand. You may find huge variety off pumps to chose from like Centrifugal Pumps, Dosing Pump, Progressive Cavity Pumps, Submersible pumps etc. etc.. Few years back there were many reservations about Submersible pumps. The concept of operating a Electro-Mechanical equipment (Pump) while it is submerged in water was a big no. Even big companies deterred from venturing in to manufacturing of submersible pumps.  
 

But there were few companies who had decided to flow against the tide. Very few of them have ventured in this three decades back. Due to their untiring efforts today Submersible Pumps have become one of the most preferred types of pumps.

Today Property owners, both commercial and residential, as well as the industries, often need to install submersible pumps on their property. These pumps can be used for variety of applications such as Clear Water Pumping, Dewatering, Wastewater Pumping, Sewage & Effluent pumping & Slurry Handling.

Though submersible pumps are widely used, not many people are aware of what exactly submersible pumps are. As the name suggests, submersible pumps are submerged in the tank, pit or a container. Known for their energy efficiency and performance, submersible pump have gained popularity over past decades. Depending on their requirement a user may choose grinder submersible pumps or any other types of submersible pumps.

What are submersible pumps?

Submersible pump is a mono unit that combines a pump and a motor (mounted on single Shaft). These pumps are specifically designed to ensure that it will work well even when it is submerged underwater. The sealing arrangement & electrical safety parameters are critical areas for any submersible pumps. The companies which are  in this field have secured CE Certification to ensure that critical areas are not compromised.

The basic difference between submersible pumps and other pumps is that submersible pumps push fluids towards the surface. In case of regular pumps, fluid is pulled into the surface. Submersible pumps like solvent submersible pumps are used in variety of industrial applications.

Types of Submersible Pumps

On the basis of application & quality of liquid to be handled, different types of submersible pumps can come into picture. Few of the popular submersible pumps applications are:

Open Well Pumps – Used to source water from, deep open well, rivers, canals, dam etc.. Openwell Submersible pumps are the most efficient way to fetch and distribute available water from various recourses, distribution can be for drinking water, agriculture farming, village water supply, landscaping etc. Depending upon the purpose necessary piping arrangement can be done.

·         Sewage Pumps – Sewage pumps has always been a cumbersome task. The large solid which are generally encountered are big headache. But modern day submersible pumps have evolved a lot. Now sewage pumps are  equipped with spiral cutting plates & thrash guard arrangements. These arrangements not only prevents pumps from chocking / jamming, but makes a overall sewage pumping manageable proposition. Today Submersible Sewage Pumps are widely used in many STP/ETP, for sludge and waste removal in industries, chemical plants, sewage works, tanneries and more.

·         Dewatering Pumps – As far as Submersible pumps are concerned this is most popular application. Today dewatering pumps are used regularly for many infrastructure projects, Industrial applications & domestic applications. The major use is for dewatering of basements, pits, quarries as well as mass water transfer. Dewatering pumps are mainly used for pumping dirty water having with little bit of suspended solids.

 

To know which submersible pump is the right fit for your need, contact Darling Pumps. With its expertise of more than 35 years, Darling Pumps is one of the top manufacturers of Submersible pumps say from Open well pumps to Slurry Handling pumps.

To know more, call +91 99819 92838 or visit them at – www.darlingpumps.in