Piston Vs. Rotary Screw Air Compressors: Which One to Choose?

Piston Vs. Rotary Screw Air Compressors: Which One to Choose?

Air compressors have diverse applications for a wide range of businesses. Two of the most popular and widely used compressors are piston and rotary screw compressors.

Piston, also known as reciprocating compressors, find maximum use in the automotive service industry such as gas stations, tire stores, and general service shops, due to their price and availability. However, rotary screw compressors can be a suitable alternative as they offer better performance and require less space.

In this blog, we will understand the various points of difference between the two to help you choose the right one for your business.

Duty Cycle and Flow

Duty cycle is the time (calculated in percentage) a compressor can operate for, without getting overheated or causing wear. The allowable duty cycle for most piston compressors is 60-70%. Most piston compressors are oversized to allow space for the compressor to shut down and cool off due to the high temperatures. This may cause capacity problems during peak operating hours.

Modern rotary screw compressors, on the other hand, have in-built aftercoolers with huge surface area and robust fans to bring down the air temperature leaving the compressor.

Oil Carry-over

When pistons, cylinders, valves, and rings experience wear and tear, the quantity of air goes down. This causes more lubricating oil to seep through the piping into the usable parts. This is known as carry-over.

Piston compressors usually pass more oil than rotary screw compressors. Rotary screw compressors experience lesser oil seepage in comparison because the rotors don’t come in contact with each other and hence, don’t wear. Moreover, the compressor fluid also acts as non-wearing sealant that’s captured, filtered, cooled, and recirculated.

Energy Efficiency

For service industries that use compressors as large as 30 hp, energy efficiency becomes an essential factor to save electricity costs.

Piston compressors usually deliver 3-4 cfm per hp whereas rotary compressors deliver 4-5 cfm per hp. This shows that rotary compressors deliver more air per unit of input energy.

Maintenance

The maintenance of piston compressors is more expensive than screw compressors because the frequency of maintenance and the number of spares is significantly higher for piston compressors. However, the advantage is that any semi-skilled technician or worker will be able to perform the maintenance service.

Noise Levels and Vibration

Traditional piston compressors produce a lot of noise and vibration. As a result, they are mostly placed in separate rooms or outside. However, the immediate ecosystem directly affects a compressor. For example, a hot and humid room will increase the compressor temperature, reduce its shelf life and make it difficult to remove moisture and oil from compressed air.

Rotary compressors cause lesser noise and vibration. They also don’t need to be kept in separate rooms or sealed to the floor, offering more flexibility with their location i.e., well-ventilated areas.

For assistance with deciding on the air compressor that suits your needs the best, please contact us on +919819907445. We would be delighted to help you find the best product or service based on your exact requirements. As one of the leading ELGi air compressor dealers, VEMC provides a comprehensive array of seamless products and services to its clients. A pioneer in electromechanical engineering products, allied equipment, and services in the field, we are also ISO 9001:2015 certified.

A Short Guide to Moisture Control in Air Compressor Systems

It’s not uncommon for moisture and condensation to accumulate in your compressed air systems. Hence, you need a solution that can help prevent excess condensation in your compressor, especially if you’re in an industry that demands 100% moisture-free condensed air.

Why does your air compressor contain moisture?

Moisture is a natural by-product of the compression process. It just extracts the moisture that already exists in the ambient air.

Some of the common causes of moisture build-up in compressors are:

  • Equipment damage – When the internal parts of compressors wear out, it leads to moisture build-up. This causes the machine to lose its power to extract air as well as heat up, leading to more moisture build-up.
  • Environmental factors – Humid conditions also cause the machine to take in more moisture leading to more condensation.
  • Pressure on the compressor – When your compressor is strained beyond capacity, it gets heated up further more. This is especially the case with piston compressors, which heat up more when used for longer periods of time.

Why is excess moisture harmful?

Excess moisture hampers the workings of your air compressor. Some of the consequences of excess moisture are:

  • Rust and corrosion – Build-up of water in your compressors can lead to rust in and corrosion of the machine and pipes.
  • Damage to pneumatic controls – The machines that rely on pneumatic controls suffer from severe damage when there is moisture build-up inside them. That can result in rust and scale build-up.
  • Rapid wear and tear of production equipment – Moisture can cause the lubrication inside compressors to wash away. This causes metal components to wear away faster.
  • Damaged circuits and in-line filters – In-line filters help clean particles and oil from your compressor. Moisture increases pressure in the machine and reduces the filter’s efficiency.
  • Contamination – Moisture can damage end products, valves, and motors. It can easily contaminate solvents, lubricants, and food products.

How to eliminate excess moisture from your compressor?

Some of the solutions you can try out to remove moisture build-up from your compressors are:

  • Install an air dryer – An air dryer works in tandem with an air compressor to remove moisture. There are four common types of air dryers: refrigerated dryers, desiccant dryers, membrane dryers, and deliquescent dryers.
  • Get a piping system – Piping systems are one of the most cost-efficient systems. In these setups, the metal pipes absorb heat to bring down the air temperature, and can be a good solution for office buildings.

VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services. With more than 72 years of industry experience, we provide best-in-class solutions and customized support in this field. We also provide a number of ELGi air compressors. Contact us at +919819907445 and we would be happy to help you determine the right air compressor for your needs.

6 Air Compressor Maintenance Tips to Avoid Breakdown

Air compressors of all makes and models require varying degrees of maintenance. Whatever the model or quantity of compressors you use for your operations, it’s essential to regularly inspect the parts and service them, whenever necessary. Failure to perform routine maintenance on your compressors can lead to early failure or expensive repairs.

Air Compressor Supplier Johor Bahru (JB), Rotary Screw Compressor Supply  Malaysia, Air Receiver Tank Suppplies ~ JCompressor Services Sdn Bhd

Here’s a short guide on how to keep your air compressors running at full capacity:

1. Drain your air receiver tank

Use the drain and plug at the bottom of the compressor to drain the air from the compressor’s air receiver tank. Collection of air in the machine leads to the accumulation of water and moisture while the machine is running, especially during summer, when humidity is higher. The moisture gets collected in the receiver tank and if not drained regularly, it can lead to corrosion of the receiver tank and piping. An automatic and a manual bypass drain during daily inspections is ideal.

2. Inspect the hoses

Hoses are often the most vulnerable parts of compressors because they need to be strong enough to transfer air between the machine and the final point, which can put a lot of strain on them. Checking your hoses on a weekly basis is extremely important. Cold weather also affects hoses — it causes them to crack or corrode and hence leak. Routine checks are ideal for keeping the hoses clean and leak detection devices are ideal to find the leaks.

3. Alter the air filter

Air filters usually trap a lot of junk. The filters are designed to bear a heavy load, without which, a lot of impurities will accumulate and degrade the performance of the compressor. This contamination is critical for industries such as food and beverage, hospitals, and labs. Air filter inspections should be done regularly, especially in dusty conditions.

4. Clean the intake valves

The intake valves of an air compressor must be clean to function fully. When compressors are put to constant use, dust particles and other elements get sucked into the vents. Cleaning the vents at least once every three months is essential.

5. Change the oil

The compressors that run on oil need the oil to be changed regularly as well. Fresh oil helps run the various parts of the engine smoothly. Especially in humid conditions, the oil loses its viscosity and fails to lubricate the different parts.

6. Get it inspected by a professional service team

Allowing a professional service team to regularly check leaks and perform preventive maintenance and required repairs, can offer a lot of peace of mind. Scheduling this regular maintenance can help save time and money in unnecessary breakdown repairs.

Keeping your air compressors healthy and functioning smoothly is essential and possible through regular maintenance. VEMC is an authorized ELGi air compressor dealer and provides end-to-end solutions for all your industrial energy requirements. Guided by more than 72 years of industry expertise, we aim to offer you specialized support in this space. VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services. Please feel free to contact us at +91 98199 07445, and we will be happy to assist you.

What type of piping is needed for my compressed air system?

Compressed air systems find use in various industries such as construction, automotive, metal-work, and wood-work. Tools used in these industries require compressed air to run and since they don’t need motors, they are lightweight and handy to use.

Compressed air systems work best when air is released from the system at the right pressure, volume, and consistency. These systems can run the risk of miscalibration which robs them of their power and leads to rust and debris build-up in the pipes.

This makes choosing the right air compression system as well as its parts integral to their efficient functioning. Pipes are one of the most critical components in a compressed air system and defective and inefficient pipes can often lead to loss of power. Moreover, obstructions and blockages, moisture build-up, and sharp angles can also affect the pressure of compressed air systems negatively.

Paying proper attention to the size, layout, installation, and maintenance of pipes used in compressed air systems is a prerequisite to ensuring their powerful performance. Two materials usually go into making pipes: plastic and metal. Of these two, metal pipes are the preferred choice for compressed air systems.

Here are some of the common types of metal pipes used for compressed air systems along with things to consider when choosing them:

  • Black steel pipes are the most commonly used ones because they are strong and durable. However, it can be time-consuming to install them and they are also susceptible to corrosion. There’s also the risk of the threaded connections slipping and leaking.
  • Another widely used type is galvanised steel pipe. They help solve the corrosion problem. However, in some cases, the galvanised coating can come off and cause blockages in the air flow.
  • Copper pipes come with a lot of advantages. They are free from corrosion from condensation and are easy to cut and weld. They are lightweight and come with a wide range of fittings to choose from. Their smooth interior means that they can sustain solid laminar flow. However, they can be a bit expensive since they require time and skill to install, especially the threading and soldering bit.
  • Aluminium pipes can also be a good choice since they are lightweight, durable, and anti-corrosive. They’re also easy to install and maintain than other types. The only downside is that it can be as expensive as copper.
  • Stainless steel pipes are corrosion-free, both from the inside and outside. Moreover, they are easy to weld and press. However, they can be heavy and the material cost can be on the higher side.

VEMC, an authorised ELGi compressor dealer in Mumbai, supplies ELGi air and reciprocating compressors that are ideal for both commercial and industrial operations. Our range of screw and piston (reciprocating) compressors are cost-effective and long-lasting solutions for light-to-heavy-duty industrial applications. To know more about our range of compressed air systems and for help in choosing the right one, contact us on +91 98199 07445. VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services.

How often should I change the oil in my pump/piston?

How often should I change the oil in my pump/piston?

Air compressors need to be in optimum condition to give the best performance. Maintaining them properly ensures that they last long and help save money in the long run. There are several maintenance routines to consider for a smooth-functioning air compressor. One of the most important routines is changing the oil in the pump or piston of the air compressor. While focusing on other maintenance routines, many people overlook this one, which often leads to poor performance of the air compressors and, in some cases, also causes damage to the systems.

Why is it important to change the oil?

The oil in a compressor has several functions apart from lubrication. It helps the compressor parts to cool down so that the motor doesn’t overheat. The oil also acts as a sealing agent during the compression process.

If the compressor doesn’t have enough oil, it may not perform as efficiently as it’s supposed to. Low oil levels cause the compressor to overheat since air compression produces heat and oil absorbs the heat. Moreover, low oil levels also increase friction, which can lead the compressor to overheat. It’s also important to replace the contaminated oil from the air compressor regularly. Failing to replace the old oil with new oil causes debris and particles to build up and hampers its smooth functioning. Lack of sufficient oil can also increase the chances of rust, wear and tear, and corrosion. Finally, oil has a tendency to oxidise in the presence of water and heat. This reduces its effectiveness which can lead to costly breakdowns.

In some systems, overheating leads to an automatic shutdown. In such situations, the compressor can be used again only after it has cooled down and the oil has been replaced.

How often should the oil in an air compressor be changed?

Air compressors need consistent lubrication to prevent friction on the pumps or pistons and hence, the oil level must be checked regularly. The frequency of changing oil in compressors depends on the type of compressors used. Some compressors need more frequent changes than others and it’s best to consult the user manual that comes with the system. It’s possible to even find the life expectancy of some oils in terms of service hours in some of the manuals.

For rotary screw compressors, the oil should ideally be changed every 2000 hours or 12 months, whichever is earlier. For reciprocating air compressors, the oil needs to be changed every 3 months.

Performing an oil analysis that checks for important factors such as viscosity, particle count, water contamination, and total acid number (TAN) can help determine when to change the oil. It’s ideal to conduct an oil analysis every 500 to 2000 hours, depending on the user manual and the warranty.

VEMC, an authorised ELGi compressor dealer in Mumbai, supplies ELGi air and reciprocating compressors that are ideal for both commercial and industrial operations. Our range of screw and piston (reciprocating) compressors are cost-effective and offer long-lasting solutions for light-to-heavy-duty industrial applications. To know more about our range of compressed air systems and for help in choosing the right one, contact us on +91 98199 07445. VEMC is a 72-years-old young organization with ISO 9001:2015 certification and is CRISIL MSE-1 rated.

What are the Basic Reciprocating Compressor Components?

A reciprocating compressor or piston compressor uses pistons that are aided by a crankshaft. The main function of the reciprocating compressor is to increase the level of pressure in gases.

A reciprocating compressor has several components that aid in the passage and compression of the gas. Each of these components plays a specific role and is equally necessary for the smooth functioning of the reciprocator compressor. 

Let’s take a closer look at the basic components of a reciprocating compressor:

Frame

The frame or crankcase is a sturdy structure that encloses all the rotating components. ELGI air compressor frames are square or rectangular shaped. In Integral Compressors, the frame is fitted to both the compressor and engine-powered cylinders which are driven by one crankshaft. 

Cylinders

Cylinders play a crucial role in containing the air that needs to be pressured. A compressor could have either large low-pressure cast iron cylinders or small high-pressure steel compressors. Cylinders help to keep the reciprocating compressor cool during the compression cycle. Reciprocating compressor dealers might also show you cylinders with replaceable liners that can be changed when damaged or worn out.

Distance piece

The distance piece is an intermediary component that attaches the low-pressure cylinders to the frame of the compressor. Due to the distance piece in ELGI air compressors, the cylinders can be detached if required. A distance piece could have a single, double or extra-long compartment arrangement. 

Piston

The piston is what compresses the gas within the cylinder. It is typically made up of a strong and heavy material that does not react with the gas in the chamber. You might find pistons made from aluminium or cast iron when looking for compressors at reciprocating compressor dealers.

Piston rings

Piston rings are placed around the piston. These rings could be either metallic-like bronze or non-metallic like a fluorocarbon compound. They are subject to friction as they come in contact with the inner walls of the cylinder and might wear out easily. Piston rings might have to be replaced regularly but help to protect the piston from damage due to friction. 

Cross head

The piston is inserted into the cylinder bore with the help of a cross head. Narrow pistons used with a cross head are more efficient as they can accomplish longer strokes. 

Crankshaft

This is what drives the piston. It is attached to the electric motor shaft on one end and to the piston on the other. Higher powered crankshafts are made of forged steel while those operating less than or equal to 150kW are made of ductile iron.

Connecting rod

The connecting rod connects the crankshaft to the piston and enables its upward and downward motion. The connecting rod is typically made of the same material as its corresponding crankshaft.

Valve

The valves of a reciprocating air compressor ensure that the gas flows in only one direction. On one side of the cylinder, there are inlet valves while on the other there are outlet valves. Valves are of three types:

  • Ring valve
  • Poppet valve
  • Plate valve

Bearings

Bearings complete the structure of the reciprocating compressor. They ensure the proper radial and axial positioning of components of the compressor including the crankshaft, connecting rod, and cross head.

If you are looking for reliable ELGI air compressor dealers make sure that you are first clear about the type of compressor you need for the job at hand. For more information on reciprocating air compressors and other equipment, feel free to contact us at +91 98199 07445. We would be glad to assist you in finding the best match for you based on your requirements. VEMC is an authorized dealer of Kirloskar dewatering pumps and provides end-to-end project management services to its clients. We are ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services.

Why My Air Compressor Is Losing Pressure?

What is Compressed Air Pressure Drop and How Do You Minimize It -  Fluid-Aire Dynamics

Air is drawn in through the inlet valve, compressed to the necessary volume, and released through a discharge valve into a storage tank by air compressors. An electric motor typically powers the compression operation. When the system is using a much greater quantity of energy than before, pressure drops will be apparent. It is important to eliminate or reduce pressure drops wherever possible as this will improve the system’s efficiency and help reduce your maintenance costs.

You can reduce or eliminate the pressure drops in the following ways:

Examine Tubing

If your Elgi air compressor system has tubing, it is crucial to do so in order to ensure that the tubes are still airtight. Tubing issues might also be brought on by rust build-up. It’s time to replace the tubing if you notice any rust accumulation or cracks.

Improve the piping layout

Although it has been demonstrated that piping systems older than five years can leak up to 25% of their capacity, many institutions are sluggish to replace ageing machinery. The majority of institutions still employ galvanised iron, also known as “black iron,” for their Elgi compressed air pipe systems even when a more effective option is available.

Look for worn-out hoses

Air leaks could be caused by kinked or worn-out hoses. Regular hose inspections to ensure they’re in top functioning order may help you detect leaks earlier and prevent problems from getting worse. Verify that none of the hoses in your system are positioned so that they are under stress.

System connections should be taken into account. Each connecting piece needs to be accurate in size and tight. If any of your connection points are unnecessarily convoluted, it might be time to redesign your system with a more straightforward strategy in mind.

Check Regulators

The pressure regulators’ settings could be the source of the pressure drop and energy rise. You can try to reset it, but if the problem persists, it might need to be replaced.

Replace Lubricators

The lubricators on your air compressor must correspond to the system’s actual flow rate. They might need to be altered if they are not operating properly within the constraints of your system.

Filter upkeep or replacement

After leaks have been found and addressed, it’s crucial to take action to stop further breaches from developing. Leaks caused by dust, corrosion-causing moisture, and the accompanying pipe sludge reduce efficiency and raise the possibility of failure or end-product contamination. Regular system maintenance not only minimises risk but also stops new leaks from developing. The quality of compressed air is ensured, and pressure drops are avoided through routine filter changes.

VEMC is an authorized dealer of Elgi air compressors and provides end-to-end solutions for all your industrial energy requirements. Guided by more than 72 years of industry expertise, we aim to offer you specialized support in this space. VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services. Please feel free to contact us at +91 98199 07445, and we will be happy to assist you.

Five Benefits Of Upgrading Your Air Compressor

Upgrade Your Air Compressor to Save Money and Energy

Industries of today are leaning towards initiatives that can reduce carbon footprint and are generally more sustainable for long term use. But when a business considers upgrading its air compressor system, it may be daunted by the initial costs. However, the benefits of upgrading can often far outweigh these. Let’s take a look at five advantages of making the move:

High return on investment

A major benefit of upgrading your air compressor is the resulting return on investment. Most often, the return on investment of upgrading is higher than the cost. This might be in the form of energy savings and other efficiency-increasing benefits.

Significant energy savings

Another huge advantage of upgrading your air compressor is the savings on energy that it yields. On average, the costs of electricity account for a whopping 80% of total costs. An up-to-date system runs much more efficiently than a worn down one and hence, leads to a significant reduction in electricity bills. This way, the upgraded system makes up for the initial cost rapidly.

Higher uptime and reliability

Air compressors, like most other systems, require maintenance from time to time. However, while maintenance takes place, the system will experience downtime. The higher the downtime, the more the possibility of losing revenue. Systems that are upgraded as needed face less downtime. Additionally, they have lower chances of breaking down and are much more reliable for regular operations, helping you to minimize production losses.

Avail of government incentives

Most governments including India’s Bureau of Energy Efficiency, have introduced initiatives to cut down the use of energy by energy-intensive industries. Called PAT Cycle VI, the Indian government offers incentives if your business adopts equipment that consumes less energy to operate. This also serves to increase your return on investment while reaping the benefits of this act.

Better health and safety for everyone at work

Upgraded air compressor systems also improve the environmental working conditions of your site. By drastically enhancing the quality of the air at work, your employees’ health and safety will be protected. As a result, they will fall sick much less than before, which means they will probably take fewer days off from work, thus increasing their productivity.

Overall, upgrading your air compressor is a step in the right direction. Consult an expert to review the health and status of your current system. If it needs an upgrade, you will now understand why getting it is a prudent decision.

VEMC is an authorized dealer of Elgi air compressors and provides end-to-end solutions for all your industrial energy requirements. Guided by more than 72 years of industry expertise, we aim to offer you specialized support in this space. VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services. Please feel free to contact us at +91 98199 07445, and we will be happy to assist you.

What Type Of Oil Should You Put In Your Commercial Screw Compressor?

Just as parts of your car and other appliances need to be lubricated in order to perform properly, so does your air compressor. But how can you tell what kind of oil is suitable for your air compressor, particularly a commercial screw compressor? To understand this, let’s first take a look at the role of air compressor oil.

Air compressor oil is a lubricant that helps to reduce the early wear and tear of air compressors. It can either be synthetic or natural and varies in characteristics like makeup and viscosity. It is important to note that air compressor oil is different from motor oil. For one, the latter contains detergent and much more carbon and sulfur.

Apart from lubrication, the benefits of using air compressor oil are many:

1. Absorbs heat

The oil keeps the air compressor at a cooler temperature by soaking in the heat that is emitted.

2. Resisting oxidation

The additives present in air compressor oil help keep the oxidation and acid formation processes at bay.

3. Improves longevity

The additives in air compressor oil also play a role in lengthening its shelf life, keeping the components of the machine protected when in standby mode, and increasing the compatibility of the oil with various conditions.

4. Stands up to the cold

Air compressor oil remains viscous even in cool temperatures, unlike many other lubricants.

The two main types of air compressor oil are standard and synthetic

  1. The standard type of air compressor oil contains a mineral oil base. This makes it cheaper than synthetic and is advisable for light or medium-duty and those who need not use their compressors continuously.
  2. On the other hand, synthetic air compressor oil contains a heavily processed and refined synthetic base. As a professional who runs an air compressor more than thrice a week, this is a suitable option for you. What’s more, synthetic oil keeps the air compressor functioning smoothly and with little to no noise. It also does a good job of preventing it from overheating.

For commercial screw compressors, it is best to use synthetic oil. These do not contain additives or sulfur that can often produce an unwanted buildup on the valves. They are also consumed at a slower rate than the standard kind, help to prolong the life span of the compressor, and stay cooler during operations. What’s more, they create fewer deposits of sludge and carbon that can adversely affect the performance of the machine, and produce air discharge at lower temperatures than standard oil. Synthetic oil also makes for safer operating conditions as its ignition temperatures are much higher than standard oil.

Suffice to say, synthetic oil is the best choice to keep your commercial screw compressor performing optimally.

ELGi Air Lube Oil provides an effective solution to suit various applications and work environments. You can choose this carefully formulated oil as a reliable way to meet your needs in different operating conditions.

VEMC is an authorized dealer of Elgi air compressors and provides end-to-end solutions for all your industrial energy requirements. Guided by more than 72 years of industry expertise, we aim to offer you specialized support in this space. VEMC is ISO 9001:2015 certified and a pioneer in the field of electromechanical engineering products, allied equipment, and services. Please feel free to contact us at +91 98199 07445, and we will be happy to assist you.