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.

One Stop Solution to All Pumping Needs in Construction Sector

Construction sector in India is considered to be the second largest employer and contributor to economic activity. 50% of the demand for construction activities in India comes from the infrastructure sector, while the rest comes from industrial activities, residential and commercial development and more.

The Indian infrastructure and construction sector have moved out of their nascent stages. For the past few decades, both government as well as private developers were targeting the projects which were easy to execute and provided the maximum economic benefit. There is substantial opportunity to undertake complex and complicated projects that require technological competence and efficiency.

Darling Pumps with its unique range of Dewatering Pumps, is well equipped to cater to various pumping demands of the construction industry. Road constructions & many more similar applications in private, government or industrial sectors face water logging problems. Our pumps are extensively been used  for construction of road & highways, airports, railways, ports, dams, water and solid waste management plants, urban infrastructure in many other construction activities. While executing such big projects, engineers are always working against the clock, so all they require is tough, efficient, reliable dewatering pumps. Darling dewatering series of pumps has everything you will ask for. With Darling Pumps cost per liter of water pumped is always minimum and quite economical.

Darling Pump offers One Stop solution for every pumping need in the construction sector. Dewatering at construction site, be it road, bridges, tunnels, dams, construction sites is always difficult. Mud slurry, stones and rocks are often found in water. Seepage water can appear out of nowhere, causing irritation and delay.

When working against the clock, all you require is tough, efficient, reliable dewatering pumps. Darling De-watering series of pumps has everything you ask for. We also customize pumping solutions as per your requirement.

With over 75O models in our product range, Darling Pumps priorities mainly in catering to exact needs of its customers. Optimizing pumping solutions is our forte.

Darling Pumps can provide pumps for entire gamut of applications in infrastructure sector like -

•         Commercial Building.

•         Commercial Malls & Hotels.

•         Car Parking Areas.

•         Storm Water Dewatering.

•         Construction Site

•         Civil Infra Projects

•         Cable Trench Pit

•         De-settling of Water

•         Tunnel Dewatering

•         Underground Civil Projects

•         Bridge Building Projects

To know more about dewatering pumps by Darling Pumps, visit http://darlingpumps.in/dewatering.html. If you have any questions, feel free to call us at +91 99819 92838.