What is a water hammer? What are its ill effects?

A water hammering  effect happens when a sudden closure of the valve causes the back and forth movement of water at supersonic speeds. Water hammer is an understudied topic, and unaware of the fact that residentials have it in their submersible motors, nobody seems to care. In the light of water hammer- for residentials, it’s just that loud noise when the submersible pumps are shut. 

Having said that; a water hammer could have some adverse effects as stated below: 

  • When a centrifugal pumpset suddenly shuts at any given site, the mass of water before closure will still be moving, hence a high pressure shall be created, resulting in a shock wave. This process makes a similar hammering sound that one often hears after shutting their centrifugal pumps.
  • In the worst case, water hammers can even cause the pipelines to break if the pressure is too high. For safety purposes, air traps are often installed to absorb the damaging factors caused by high pressure.
  • The water hammer can also harm valves and pipes in case of any water, oil, or gas application. This happens in the same process of high pressure, as mentioned above, which causes a spike, thereby damaging gauges. This can occur even if the gauge has a correct pressure range for the flow application.

To avoid these adverse effects of a water hammer, air chambers prove to be quite useful because they soften the impact and hence prevent the hammer effect.

But you can swiftly avoid the chances of a malfunctioning water pump, by opting for the high-efficiency Kirloskar pumps that Vijay Engineering and Machinery Company, the best pump dealers in Mumbai, promise to provide to you. Counted amongst the reputed pump dealers in India, VEMC is the answer to your problems!

In which direction does water enter the centrifugal pump?

So, how does water enter the centrifugal pump? Well, there are different ways in which it makes it to the eye of the impeller in the pump:

  1. End suction and top discharge centrifugal pump:

 In this arrangement, the water enters the impeller horizontally and then proceeds to discharge vertically from the top of the pump, a good example of which is the single stage horizontal centrifugal pump popularly known as end suction back pull out pumps

  • Top suction and top discharge centrifugal pump:

The water both enters and discharges from the top of the pump,i.e. top half of the casing  something which happens in a boiler feedwater pump.popularly known as Multistage pump.

  • Side suction and side discharge centrifugal pump:

Here, the water both enters and exits from the same direction, but in this case, it is from the side.i.e. bottom half of the casing. A classic example of this type of arrangement is an axial split horizontal centrifugal pump. Popularly known as side suction side discharge pump

No matter which method is employed, they are available in a variety of options and are applicable in several applications.

So, if it is centrifugal pump you seek, VEMC stands by its promise to provide only the best to you as the renowned distributors of the reliable Kirloskar pumps, making it one of the best pump dealers in Navi Mumbai, Mumbai and Raigad Districts

Incidently we are also the Master Distributor for process pumps for entire West and Central zone.

Happy pumping as it is a way of Life at VEMC

What will happen if the speed of the centrifugal pump doubles, keeping other parameters the same?

What happens if we increase the speed or rather double it, keeping the other parameters constant? This is what will happen:

It is governed by the Affinity Laws (Laws of Similitude)

Flow ( Q ) is directly proportional to the ratio of the speed

Head ( m ) is directly proportional to the square of the ratio of the speed

Power required is directly  proportional to the cube of the ratio of the speed

Eg.  If flow and head is 10 m^3/hr and 10 m @ 1450 rpm respectively

        Then @ 2900 rpm the flow shall be 20 m^3/hr and head shall be 40 m.

Hence, increasing the speed of water pumps or doubling it without a proper understanding of the consequences that it will have on the pressure and flow of the pump can lead to the entire system to fail.

But when it comes to Vijay Engineering and Machinery Company, you can rest assured that you will be given the best service by one of the trusted pump dealers in Mumbai, who are renowned for providing a wide range of high-quality Kirloskar pumps.

Vijay Engineering and Machinery Company, one of the best pump dealers in Mumbai, provides a wide range of Kirloskar pumps like submersible pumps, water pumps, submersible motors, etc. Click here to know more about the products and services we provide

How To Decide – Reciprocating Compressor or Screw Air Compressor

Elgi Screw Compressor & Reciprocating Compressor

In recent times, more and more industries rely on compressed air and are, sometimes, called the 4th utility of any industry. When looking for an air compressor, there are different types of compressor like Reciprocating compressor, Vane Compressor, Screw Air Compressor, Diaphragm Compressor, Centrifugal Compressor, and so much more. We will talk about the 2 popular types of compressor, namely the reciprocating and screw air compressor (also known as the rotary compressor). Users often get confused between these 2 variants during purchase; however, in order to make the correct decision, you will need to understand how they operate.

Reciprocating Compressor

In a reciprocating compressor, air is taken into a cylinder and then compressed to a higher pressure with a piston using reciprocating motion (much like an engine). Piston compressors are the most common type of compressor used in most industries because of their lower capital investment. These compressors, however, make a lot of noise and vibration. As the compressor operates on reciprocating motion, there is pulsating air produced, which causes the inlet and outlet valve blades to open and close multiple times a second, making higher noise levels. Most air compressors manufacturers provide an allowable duty cycle of 60%-70%. That said, a general recommendation is that when your compressor is idle for more than 50% of the time, it is best to go for a reciprocating compressor. Piston compressors are usually oversized to allow some idle time as they operate at higher temperatures. BAC Reciprocating Compressor ranges from 0.5HP to 20HP and are manufactured to industry standards to withstand above 70% duty cycle.

Screw Air Compressor

Screw air compressor consists of 2 rotors, rotating in the opposite direction, compressing air between the lobes to a higher pressure. Since the rotors are rotating and not reciprocating, there is minimal vibration, wear, and downtime compared to a reciprocating compressor. In a reciprocating compressor, there is a high friction loss between the piston rings and cylinder compared to a screw compressor where their rotors are non-contact. The air produced is continuous and prevents the inlet and outlet valves opening and closing continuously, thereby reducing noise to significantly lower levels. Screw compressors are especially good in medium-scale and large-scale industries where there is a continuous requirement of air. These compressors do not prefer idle time and long periods of idle time, which sometimes causes issues. Rotary Screw compressor requires a higher capital investment, but provides better efficiency and faster ROI. There are 2 types of screw air compressor fixed speed and variable speed compressors, each having its own advantages. BAC’s screw compressors currently range from 7.5 hp to 60 hp, and also provide custom combinations for getting the best out of your investment.

If you are in search for a reliable and professional supplier of Reciprocating or Screw Compressors, you can contact Vijay Engineering And Machinery Company – the Authorised Distributors of Elgi Compressors and Spare Parts.

What makes a fire pump different from other kinds of pumps?

Are you also amongst the ones who don’t find any difference between fire pumps and other pumps, primarily domestic water pumps?  Both pump water, don’t they? But they are as different as the scenarios they are employed in. And as the material and construction of fire pumps is different, they are far more costly than ordinary pumps.

So, before you go switching your fire pumps with domestic water pumps to control the cost, let’s take a look at the differences between the two:

  1. Corrosion-resistant- As we mentioned, both pumps are used in different situations wherein the fire pump is an emergency pump, rarely used in normal times. But all the time it is not in use, the fire pump still needs to be intact for whenever it is needed. So, a fire pump is constructed, keeping in mind to keep its corrosion resistance factor high- much more than that of an ordinary water pump. Like, water pumps have a cast iron material used in the construction of their impeller, compared to the pure copper or stainless steel impeller of fire pumps.  
  2. Fire pumps have to be fire-resistant- No matter how similar their applications might look, it is important for a fire pump to be fire resistant- something a water pump doesn’t need. A fire pump is not merely supplying water, it is used douse fires so, the material of the pump has to be metal and the surface of fire pump needs to a red paint coating, which not only stops it from getting rust but also fire-proofs it.
  3. High-temperature resistance- Fire pumps have to be high-temperature resistant as they may have to counter scorching heat in the event of a fire hazard, something ordinary pumps don’t have.  

Now that we have cleared the air of any lingering doubts and you are sure without a doubt that it is a fire pump you need, ensure that you approach the best pump dealers in Mumbai, Vijay Engineering and Machinery Company. Be it centrifugal pumps or submersible motors, VEMC provides only the best and proves that it is one of the renowned pump dealers in India and the trustworthy distributors of the reliable Kirloskar pumps. Whether it is the best pump dealers in Navi Mumbai or topping the list of pump dealers in Vashi, VEMC has never failed to excel. Check out our website for more!

Factors to Consider When Choosing Gate Valves

Gate is one of the most used valves when opening and closing the flow of liquid from a straight medium line. The gate valves are usually found in different places. Instantly they are found in the irrigation areas and can be used in different plantation areas in regulating various fluids.

Valves are essential components used in the pumping systems in diverse industries. Some of the main functions of the valves is preventing backflows, regulating the direction of flow as well as regulating the system pressure, the UL /FM approved gate valves may sometimes be dismissed as secondary considerations while designing different faucets at your home. This is necessary because they increase the performance of the systems minding their efficiency, longevity, and safety. This article, therefore, will discuss the critical factors you should ‘put into consideration while selecting the gate valves.

The type of valve used:

The water faucets at home are mostly made of valves with handles used in regulating the flow in it. The valve, therefore, should be designed with a gate as well as an actuator. The actuator is usually made of level, electric motor or a handwheel. Each of these creates the anticipation of regulating the performance that makes the valve useful in given conditions. Therefore, the gate valve is regarded as a piece of metal that determines the passing and non-passing of the flow.

Actuation Method

It is necessary to consider the operation of the valve. Therefore you need to determine if the valve is manually operated by hand or it will require an actuator for turning it on and off automatically. If you settle on the latter, then you decided on the unit that will be used if it will require, pneumatic, or hydraulic actuator. There are other several Gate Valves Ul/Fm Approved and used in different industries with electric motors. Therefore, it is necessary to determine the functionality of the gate valve.

Maintenance Requirements

Maintenance should be done regularly; the gate valve requires maintenance to ensure they do not clog. Hence, this is the simplest method of providing the gate valves to serve you for a long time. The gate valves are designed in a way that makes them easy to clean without having to disconnect the end cups from the pipe. This, therefore, prevents the line from shutting done during the maintenance process. The most common uses valve the wedge valves that are parallel, the valves are utilized highly because they easily overcome the contraction and expansions in the climate that fluctuates regularly.

Application Conditions

Selecting the right gate valve for application in the essential factor when choosing a correct valve for your application purpose. When the valve is not appropriately sized, it may lead to operational issues within the valve or in the system. This also determines the temperature, flow rate and pressure that the valve operates with. However, metal valves in most sentences withstand the high temperatures as well as the pressures as compared to the plastic ones.

Valve Function

Before installing the valve gate, always consider determining the need of the valve. They are typically used in on and off controls, diverting as well as media mixing. Also, consider if your valve will be open or closed. When you want to increase the life expectancy, you should consider the order value in the orientation as well as the changes on different valves.

Finally, there are diverse factors involves when selecting the right UL /FM approved gate valves for your application. It is essential to seek the help of qualified engineers to help in analyzing the critical factors as well as in understanding the application requirements. This will; be essential in finding the right gate valve for your application.

Various reasons for a centrifugal pump not discharging water

When centrifugal pumps produce inadequate flow, not only is the pump’s efficiency compromised, but the entire system suffers a gradual breakdown until the problem is solved. But often, we put the entire blame of the low flow on the pump itself, misdiagnosing problems in the system as pump problems only but to solve issues related to the performance of the system one has to look at the bigger picture.

Reasons for a centrifugal pump to produce a low flow of water

  1. A clogged suction pipe: If a suction pipe is riddled with debris, there is less flow into the pump, which in turn leads to less flow out of the pump.
  2. Worn impeller, ring, and plate: If the vanes on the impeller, the ring, and plate have worn down, the hydraulic capacity of the pump is hampered.
  3. Reversed Impeller Rotation: Often, a pump’s motor is bump started without first ensuring whether the pump is hooked up for proper rotation of the shaft. So, when the motor turns in the wrong direction, the shaft is pushed back by the impellor which nat damage the internal surface of the pump.
  4. Excessive Clearances: Excessive slip may occur if the clearances are too wide for the type of fluid pumped causing the fluid to recirculate inside the pump, thus causing the lower flow.
  5. Debris in the impeller: The hydraulic capacity of the impeller is sometimes removed by the debris clogging it, creating an area of low pressure.
  6. Open Bypass Valve: Sn open bypass valve may be the one diverting the flow isn’t somewhere else.

But you don’t have to worry about under performing centrifugal pumps or water pumps not working adequately as you have the best pump dealers in Mumbai, Vijay Engineering and Machinery Company at your service. It is regarded as one of the reputed pump dealers in India and the trustworthy distributors of the reliable Kirloskar pumps. From being titled as the best pump dealers in Navi Mumbai to being the trusted pump dealers in Vashi assisting industries for decades, VEMC lives by its principle to never compromise on delivering excellence. Check out our website for more!

How to select the right pump for any chemical process?

As the name itself suggests, chemical pumps are used in the process of making, using or disposing of chemicals. The materials used in their construction and designing are chosen in a way that they can withstand substances with high or low levels of viscosity, abrasiveness, and corrosiveness. 

When something is so susceptible to the state of the substance flowing through its interiors, it becomes crucial to be as accurate as possible during its selection. When it comes to zeroing on the correct chemical centrifugal pumps, there are many variables one has to keep in mind:

-The materials used for the construction of the pump

The materials used should be compatible with the chemical media as acids like sulfuric acid and hydrochloric acid may cause problems like corrosion.

There are two types of pump materials- metal and nonmetallic. Metallic chemical pumps are mostly made from stainless steel, a nickel alloy or titanium for protection against corrosion. Nonmetallic pump materials are rubber, plastic, ceramics, glass, etc. which are all used as pump materials for corrosive materials.

  • Pump size

If a pump of incorrect size is picked up, it will lead to operating problems within the pump fluid transfer system. Although owing to a built-in safety factor, mostly pumps are slightly oversized but if a pump is too big, it can make the centrifugal motor to be lightly loaded during operation. This, in turn, leads to lower productivity and higher operating costs. 

There are other issues that crop up as well like premature bearing failures, excessive vibration, increase in operating temperature and cavitation issues. But that doesn’t mean that one should go for an undersized pump as it has its own share of consequences. In an undersized chemical pump has to pump faster, straining their pump components, bringing down their suction capabilities, as well as fastening its wear, which may lead to failure.

  • Pump performance specifications

The proper performance of the pump includes maximum discharge flow, maximum discharge pressure (head), inlet size, discharge size, and media temperature. Hailed as the best pump dealers in Mumbai, Vijay Engineering and Machinery Company is regarded as one of the reputed pump dealers in India and the trustworthy distributors of the reliable Kirloskar pumps. From being regarded as the best pump dealers in Navi Mumbai to being the trusted pump dealers in Panvel, VEMC lives by its principle to never compromise on what is best for its customers. Check out our website for more!

How does the temperature of the Photovoltaic Model actually affect the power generation process?

Though highly efficient compared to other renewable energy resources, a solar PV module is severely affected by major fluctuations in temperature. When the temperature turns extremely excessive, the energy output of a PV system is hampered and results in unexpected energy loss. 

Why does temperature affect the solar photovoltaic model?

The efficiency of solar panels is negatively affected by an increase in temperature. In practice, photovoltaic modules are tested at a temperature of 25 degrees C (STC) – about 77 degrees F.- this is the Standard Test Condition temperature where the module’s nameplate power is determined. The heat can reduce energy output efficiency by 10 to 25%, depending on the solar panel’s installation location.  Increase in the temperature of the solar panel increases the output of current exponentially and lowers the voltage output linearly, severely reducing the solar panel’s capability to produce power. 

A panel’s heat tolerance can be deduced checking out the sheet provided by the manufacturer, which carries a term called the “temperature coefficient (Pmax.)”-  the maximum power temperature coefficient.  This gives you a fairly accurate idea about the percentage of power loss when the panel has to bear a temperature spike 1°C above 25°C. 

But there are multiple ways to ensure to bring this situation under control

• When installing the panels, place them in a way that they are a few inches above the surface of the roof so that there is enough space in between for convective airflow, allowing the panels to cool down. 

• It is a known fact that dark colours absorb more heat, so the best idea would be to make sure that the panels are constructed with light-coloured materials.

• Components like inverters and combiners are already doing the heavy work and as a result, get heated up. Keeping them in direct sunlight will only tip the soaring temperature over the edge, so it is a good idea to keep them in a  shaded area behind the array. Be it choosing the right solar panel or ensuring the proper installation of a solar tracking mount, the best solar EPC consultants in Thane, Vijay Engineering and Machinery Company is at your service. Hailed as the best EPC Consultants in Navi Mumbai as well, VEMC is renowned for providing only the best. Check out our website for more!