The SU Group, named after its founder Shri Santokh Uppal was set up in Mumbai in the year 1967. Having done his engineering in UK, he had a valuable insight of this industry at Pleuger Pumps – Germany. He then returned to set up one of India’s first units to manufacture pumps in this country, thereby earning him the unofficial title of "Father of the Submersible Pump Industry & Pioneer of the Dewatering Pump Industry".


SU is one of India’s most diverse manufacturers of pumps. Our product range hosts a large selection such as Process, Dewatering, Sewage, Submersible, Marine and Special Pumps. SU is also one of the few manufacturers who, supplies specialized motors and equipment to the Defence Department which are used in our Main battle Tanks.


Offering a wealth of competence and expertise in the design and installation of our products, SU has a proud engineering heritage spanning almost four decades. We pride ourselves not only to mechanical design but also in encompassing pump integration into the overall system in which it is installed. Keeping in tune with technology, our ever evolving research & development enable us to design and manufacture products suited to meet individual and specialized requirements of our clients.


Extensive application and material knowledge combined with the established product ranges with the SU group ensures confidence throughout a wide range of markets and manufacturing process. Our products are tried and trusted and our engineering expertise over the last 40 years combined with our extensive product range makes SU a reliable choice.


In an increasingly competitive world, we have the ability to provide new innovative Designs using Computer Aided Design packages to ensure that optimum mechanical and hydraulic performances are achieved. Not only does this help in the development of our products, but also ensures that our products are cost effective and reliable.


Service, the "SU Way" means responsibility for ensuring that the customer draws exactly the sort of benefit from his product which he has the right to expect. It means offering competent assistance in everything to do with pumps, pump applications and pump installations. We at SU believe that "Service is far more than just spare parts".

Knowledge Base

A - B

Absolute Pressure

Absolute Pressure is the total force per unit area exerted by fluid. It equals atmospheric pressure plus gage pressure. Units are expressed in PSIA.

Atmospheric Pressure

Atmospheric Pressure is the force exerted on a unit area by the weight of the atmosphere. At sea level, the atmospheric standard pressure is 14.7 pounds per square inch.

C - D


Centrifugal consists of a fan-shaped impeller rotating in a circular housing, pushing liquid towards a discharge opening. Simple design, only wearing parts are the shaft seal and bearings (if so equipped). Usually used where a flow of liquid at relatively low pressure is desired. Not sell priming unless provided with a priming reservoir or foot valve: works best with the liquid source higher than the pump (flooded suction / gravity feed). As the discharge pressure (head) increases, minimum flow and driven power requirements decrease. Maximum flow and motor loading occur at minimum head.

Check Valve

Check Valve Allows liquid to flow in one direction only. Generally used in discharge line to prevent reverse flow.

E - F


Efficiency - The ratio of the pump output to the pump input

 				     Pump Output
Thus pump efficiency =  ------------------
                       		     Pump Input

Flexible Impeller

Flexible Impeller a flexible, vaned member, usually rubber, rotating in an eccentric housing the volume of the spaces between the vanes changes as the pump rotates, and pumping action is created. Usually used with pressures up to 30 PSI.

Flooded Suction

Flooded Suction Liquid source is higher than pump, and liquids flows to pump by gravity. Preferable for centrifugal pump installations.


Flow - The measure of the liquid volume capacity of a pump. Given in Gallons Per Hour (GPH) or Gallons Per Minute (GPM), as well as Liters per Minute, (LPM) and milliliters per minute (mt/m).

G - H

Gauge Pressure

Gauge Pressure Using atmospheric pressure as zero reference, gauge pressure is a measure of the force unit area exerted by a fluid. Units are PSIG.


A groove made to hold the o-ring seal so that desired compression for proper sealing is maintained.


Another measure of pressure, expressed in feet. Indicates the height of a column of water being lifted by the pump, neglecting friction losses in piping.

I - J

Inlet Pressure

Inlet Pressure is the average pressure measured near the inlet port of a pump during operation. It is expressed either in units of absolute pressure (PSIG) preferably, or gauge pressure (PSIG).

K - L

Lift - (Suction Lift)

Lift - (Suction Lift) Liquid source is lower than the pump. Pumping action creates a partial vacuum and atmospheric pressure forces liquid up to the pump. Theoretical limit of suction lift is 34 feet, practical limit is 25 feet or less, depending on pump type and elevation above sea level.

M - N

Net Positive Suction Head (NPSH)

Gauge reading in meters taken on the suction nozzle referred to the pump center line, minus the vapour pressure in meters corresponding to the temp. of the liquid plus the velocity head at this point. NPSH as well as inlet total head, is referred to the same plane.

NPSH Reqd.

The NPSH required at given flow and speed of rotation for a given pump is a function of pump design and varies from one design to another.

NPSH Available

The NPSH available for the same flow which is inferred from installation. This is a function of a system comprising of suction head or lift, friction head, and the vapour pressure of the liquid being handled. For a cavitation free performance of the pump the NPSH available be higher than the required.

O - P

Outlet Pressure

Outlet Pressure or discharge pressure is the average pressure at the outlet of a pump during operation, usually expressed as gage pressure (PSIG).

Overall Efficiency

The ratio of the pump output to the driver input

 		     Pump Output
% Percent  =  ------------------
   		     Pump Input

Peristaltic Tube

Fluid contracts tubing. A bushing rotates in a housing squeezing a tube creating a suction which draws fluid through the tubing.


The basic definition of pressure is force per unit area. As commonly used in hydraulics, it is expressed in pounds per square inch (PSI).

Q - R

Relief Valve

Usually used at the discharge of a positive displacement pump. An adjustable, spring-loaded valve opens, or 'relieves' when a pre-set pressure is reached. Used to prevent excessive pressure and pump or motor damage if discharge line is closed off.

Resin filled Sub Motors

It is a motor, where stator is encapsulated and filled with an insulating compound. The remaining portion is filled with water or oil.

S - T


A device mounted in the pump housing and / or on the pump shaft, to prevent leakage of liquid from the pump. There are two types:


Mechanical nas a rotating part and stationary part with highly polished touching surfaces. Has excellent sealing capability and life, but can be damaged by dirt or grit in the liquid.


A flexible ring (usually rubber or similar material) with the inner edge held closely against the rotating shaft by a spring.

Resin filled Sub Motors

It is a motor, where stator is encapsulated and filled with an insulating compound. The remaining portion is filled with water or oil.

Seal-less - (Magnetic Drive)

No seal is used, power is transmitted from motor to pump impeller by magnetic force, through a wall that completely separates motor form impeller.

Specific Gravity

Specific Gravity - of a fluid is the ratio of its density to the density of water. As ratio, it has no units associated with it.

Example: Specific Gravity is 80# over 62.4# or SG = 1.282

U - V

Vacuum or Suction

Vacuum or Suction are terms in common usage to indicate pressures in pumping systems below normal atmospheric pressure, and are often measured as the difference between the measured pressure and atmospheric pressure in units of inches of mercury vacuum, etc.

Vapor Pressure

Vapor Pressure of a liquid is the absolute pressure (at a given temperature) at which a liquid will change to a vapor. Vapor pressure is best expressed in units of psl absolute (psia). Each liquid has its own vapor pressure - temperature relationship.

Velocity Head

The energy in a fluid due to it's velocity, expressed as a head unit.


the viscosity of a fluid is a measure of its tendency to resist a shearing force. High viscosity fluids require a greater force to shear at a given rate than low viscosity fluids

W - X

Wet type Sub - Motor

It is a motor, which is completely filled with clear water or oil or emulsion of water and oil.

Application sectors

The SU clientele is a veritable who's who of Indian Industry. Having a presence for almost forty years, SU has taken an active involvement in most major projects in the country. Today SU Pumps are seen in all sectors covering usage from light to heavy-duty applications.

Flood Water Control
Chemical / Process Industry
Food Industry
Pharmaceutical Industry
Steel Plants
Power Generation
Sewage Treatment
Urban & Rural Water
Supply Schemes