Pump Universe

Introduction Let us start this session with a question. Which pump part contributes to most % of pump failures?    As per the survey by Euro pumps association, 39% of the pump failures are contributed by the shaft seal ( highest among the equipment) Also, the shat seal contributes to 44% of pump repair costs. Shaft sealing and its failures seem to be the most challenging equipment to maintain in the pump system. Good Day Everyone, This is Karthik and Welcome to the Mag Sealless Pump Basics for process industries. Overview A brief overview of this lesson. Firstly,    Traditional sealing methods and their limiting factors. Secondly, Magnetic coupling, Demagnetization ( Cause and effect)    Then, the  ETFE Lined Pumps It’s advantages and essential accessories to ensure reliable operation. Typical Applications of our previous installations, so that you can consider to apply it in a similar application of yours. Then, a bit about  PP/PVDF Mag Drive Pumps Traditional Sealing Methods Now

Is the Max Suction specific speed value is   11000 US Units to ensure wider operating range. Let's look at this section. First let's talk about Specific speed.   Specific Speed Specific Speed is a Dimensionless Number indicates the impeller geometry   It has components of speed, Flow at BEP , Differential Head at BEP all for the max impeller condition.   High Ns refers to Axial flow or propeller impellers ( > 9000 Units) and is responsible for larger flow rates.   Low Ns   refers to radial flow/Centrifugal impellers (< 4000 US Units) which provides higher heads.   Medium Ns values refers to Mixed flow Impellers ( 4000- 9000 US Units) which provides a bit of both.  Suction Specific Speed  Suction Specific Speed is in reference to impeller eye   design and is an indicator of suction performance. It has components of Speed in RPM, Flow/ Impeller eye at Best Efficiency Point, NPSHR at Best Efficiency Point all of them derived from the maximum impeller

Damaging cavitation can lead to pits on pump components especially the impeller and lead to catastrophic pump failure.   Hence, understanding the Net Positive Suction Head and its impact helps us to operate the pump without major implications.   Net Positive Suction head as the name goes by, is the Net Suction head that you need to have in the pump system to avoid the damaging cavitation.   The truth of the matter is, there will always be cavitation or the presence of vapor bubbles.   Hence, our responsibility is to make sure that the Net Suction Head is abundant which reduces the vapor bubble volume and hence avoids the damaging cavitation.   NPSHA is the Net Suction Head of the system    minus the Vapour Pressure Head     Suction Head of the system has components such as   Surface Pressure Head at suction (Hpa) + Static Suction Head (Hss)   - Friction Loss Head at suction (Hfs ).   All of them derived from the absolute pressure values. Add caption   You

Let us consider a system curve of a pump system.   A misconception of the total system head can either decrease the output i.e., flow rate  or runs the flow out of the pump hydraulics.   Hence the estimation of TDH plays a vital role prior to the pump sizing.     The total differential head has two components, Discharge Head and Suction Head.  It is basically   a difference between the total discharge head and total suction head   Now let's look at the suction head   Suction head has three components in their calculation, static suction head (hss), pressure head ( hps) &   friction loss head at suction (hfs)   Where   Static suction head is the elevation height from the suction level to the suction flange.   If the suction is from the below the centreline of the pump, then it is called suction lift and it is expressed in a negative value.   Then the surface pressure at the inlet side. It is zero for atm tank/ sump   Then friction loss at suct

Will you be surprised to know that cycling across the slopes and centrifugal pumping principle follow the same rule. Well, it is .. Just like how you cycle across the slopes. While riding upward, you notice that you spend lots of your energy but the cycle rides slowly. This is the phase of an increase in potential energy. Then you reach the top with the highest potential energy.  Whereas while riding downward, your potential energy is spent and you notice that you right faster with less or no effort is spent. This is the phase of kinetic energy.  This phenomenon is called of energy transforming from one phase to the other is called the law of conservation of energy.  Bernoulli's Principle Bernoulli's principle is derived from the law of conservation of energy i.e., pressure energy across the system is a constant regardless of the change of the potential energy or kinetic energy.  Centrifugal pumps work on the basis of this principle i.e, decrease in kinetic energy while the flu

Just observe this water droplet. This droplet creates a pressure on the surface it sits. Based on this, please advise how do you define a pressure.  Good Day Everyone, This is Karthik and Welcome to the Pump Hydraulics Basics.  Overview First Things First A quick overview of what we are going to discuss in this series.  Firstly, What is pressure. Then different types/ variants  of pressure.  Secondly, Bernoulli’s theorem and its significance Then, the total differential head and how to calculate them.  More about NPSH and how to calculate them Then finally about Specific speed and Suction Specific Speed. Some datas and myth busters.  Pressure  Pressure is nothing but force per unit area.  The  person swimming in the pool experiencing the force in his ears and his body is the force acting on his body which is a defined area by itself.  Hence, when we talk about pressure, we refer to force acting on an unit area.  The SI unit is N/m2 or Pa. The common metric unit is bar.  Then what is an