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What to Consider when Purchasing Industrial Air Compressors

What-to-Consider-when-Purchasing-Industrial-Air-Compressors-01Compressed air is the 4th most important source of energy along with electricity, water, and natural gas. It is one of the most popular uses in almost all industrial businesses like small and large huge workshops of waste-water treatment plants, in petroleum, cement, chemical, and mining as well as metallurgical mills—and this excludes all of the many sub-systems and other components in the entire compression system.

Compressors, primary drives, management and regulation systems, and the equipment for air processing are the most important of all the subsystems. The most contemporary industrial compressors are sold as compact units containing the compressor itself, the engine, and tons of additional devices. All of these simplify the installation process and operation facility. Additionally, this is a technology that generates compressed air as a source of energy.

Based on the usage of these compressors, you’ll see that there are numerous choices in industrial air compressors and a lot of diverse air compressors in specific industrial uses – such as rotary screw industrial air compressors, piston compressors, rotary sliding vane compressors, and centrifugal compressors.

Selecting the rotary air compressor that is right for you can be a difficult task. The right compressor can support and facilitate a lot of other tasks to a greater extent. There are a few smaller organizations who decide to use a smaller air compressor unit, but they quickly realize that this may be a mistake. Personal sized air compressor units aren’t suitable for daily use and don’t function correctly when being used for industrial use. It would be the wisest of investments to place your funds on an ideal industrial air compressor in order to save expenses and manpower in the future.

The most popular air compressors used in an industrial setting are rotary screw air compressors. They are one of the most reliable, meaning less service fees and downtime, and they have a long service life. Rotary screw air compressors are also compact in their design and have easy maintenance facilities. Business owners and managers alike tend to prefer these types of compressors.

Before you purchase your compressor, you need to analyse the space it will be occupying. Industrial air compressors that are being used in businesses that have overnight and all day operations can tend to be pretty large in size, which needs to be considered beforehand. You need to look for a reputable company like Nasta Compressed Air Services that will take the time to assess your physical space to determine which type of compressor will suit your needs best.


Nasta Compressed Air Services is fully equipped to handle any type of service, repairs or refurbishment on any compressor. We can sell any Ingersoll, Rand and ABAC compressor were we can quote a complete compressor system or help with a specific inquire. There is a comprehensive line of piston and rotary screw compressors available, from 5 to 1000 cfm, in low and high pressure models, which is designed for total accessibility and reliability. Nasta Compressed Air Services are also involved with installations of compressors and piping for compressor systems and that divines our company from others. Nasta compressors consist of a rental fleet of compressors that will help customers with the hire of a machine while there compressor are being repaired.

Which Air Compressors type is right for you?

Air Compressors - Nasta

There are many types of air compressors to choose from. Choosing the right type of air compressor is very important for your needs as it will save you money and trouble on the long run. You will learn on this page the advantages and disadvantages of the different kinds of Air Compressors.

It all depends on what you use it for! You will find here a short list of the most popular types of Air Compressors and we will discuss the pros and cons of each one, including some typical examples and ordinary uses.

The difference between these Air Compressors is both the PRESSURE and the FLOW (cubic meters per minute, or cubic feet per minute). Most common pressure is 7 to 8 bars.

Strap yourself in, because air compressors differ in many ways depending on job demands. Deciding between each option below is a matter of looking at needs, the tools being used, how many users, and budget.

An air compressor is one of the most versatile sources of power. There are different types of air compressors and each of them comes with their own offered features. An air compressor offers a lot of good benefits for their customers but at the same time, it also comes with a drawback so you better choose for the best type of air compressor that suits you perfectly.

Reciprocating air compressors are positive displacement machines, meaning that they increase the pressure of the air by reducing its volume. This means they are taking in successive volumes of air which is confined within a closed space and elevating this air to a higher pressure. The reciprocating air compressor does this by a piston within a cylinder as the compressing and displacing element.

Rotary air compressors are positive displacement compressors. Most common rotary air compressors are the single stage helical or spiral lobe oil flooded screw air compressor. These compressors consist of two rotors within a casing where the rotors compress the air internally. There are no valves. These units are basically oil cooled, where the oil seals the internal clearances.

Nasta Air Compressors are the best and most reliable company you’ll ever need for all your compressed needs.


Pressure Vessel Testing

Pressure Vessel Testing

Pressure vessel testing is a requirement, in accordance to the South African Pressure Equipment Regulations (PER), to be carried out every 3 years on any vessel with an operating pressure of 50 kPa or higher. Other than being a prerequisite under law, consistent pressure testing just makes sense. A pressure vessel can store compressed air at several times that of atmospheric pressure and can be hazardous if they are not maintained properly and tested regularly. By making sure that all air receivers or other vessels under pressure are operating according to SANS347, you are safeguarding a healthier and safer work environment.

SANS 347 is the occupational health and safety body that governs the categorisation and conventionality assessment criteria for pressure equipment and is assimilated with the PER. Pressure vessel testing is carried out in order to examine the reliability of air receivers or other pressure vessels. The test includes an internal and external check to inspect for corrosion, thickness testing and hydrostatic testing to check for leaks or cracks on a vessel. Compliance with the PER guarantees that accidents don’t happen.

Compressed air…not hot air.

Unfortunately, enterprises using compressed air are frequently taken in by the hot air of sham operators. The PER declares that any pressure testing needs to be executed under the authority of a SANAS official Authorised Inspection Authority (AIA). Compressed air that is stored in faulty receivers may become explosive and lead to serious injury or even death, as well as damage to the equipment. The question then becomes, is this risk worth the few hundred Rands saved by having the test performed by unauthorised personnel?

At Nasta Compressed Air Services, only reputable inspection authorities are used and provide pressure vessel testing that follows the Pressure Equipment Regulations and is acquiescent with all companies’ Occupational Health and Safety requests. In our over 20 years of working with air compressors and compressed air systems, Nasta Compressed Air Services has come across all sorts of duplicitous antics by fraudulent companies and individuals and realised that, in the end, it’s the client who ends up paying.

If the price of pressure testing looks too good to be true, request the service provider provides you with the CP certificate and the SANAS registration number of the Authorised Inspection Authority being used. In recent times, a company had all of the vessels on their plant tested and when they were audited, it was revealed that the company was given test certificates by a fake operator and had to have their vessels tested again at substantial cost. Accountability for the testing lies on the company and with regards to insurance or workman’s reparation claims, failure to conform can lead to non-payment and lawsuits.

Established in 1994 by Mr Jan de Jong, and operates from Alberton, Gauteng with over 27 years of experience in the compressor industry, Nasta Compressed Air Services is a fully equipped establishment that handles any type of service, repairs or refurbishment on any compressor.

Desiccant Compressed Air Dryers

Desiccant Compressed Air Dryers

A desiccant compressed air dryer makes use of a special material, called desiccant to parch the compressed air. The desiccant is made from a material that, for lack of a better term, ‘likes’ water. The water attaches itself to the surface of the desiccant and from time to time, the desiccant has to be dried, or ‘regenerated’, in order to remove the water again.

In order to have the largest possible surface, the desiccant is utilised in the form of thousands of tiny beads. The types of desiccant that are commonly used are silica gel and activated alumina.

How does desiccant compressed air dryer work?
A desiccant dryer typically has two similar towers, filled with desiccant. While one tower is used to dry the compressed air, the other tower is regenerated.

Every now and again – controlled by a central control unit – the dryer changes towers. The compressed air is then dried by the second tower and the first tower, filled with wet, saturated desiccant, is then dried.

In most dryers, there is a small glass and behind the glass, you can see small beads. These beads are not the drying-desiccant, but rather an indicator. Its colour will change when the air is too moist. It needs to be checked every so often to ensure that the dryer is functioning properly.

The regeneration or drying of the desiccant
When the desiccant has completed its job after some time, it will absorb all the water from the compressed air and is then saturated with water. It will not be able to hold any more water. In order to recycle the desiccant, you will need to discard all the leftover water. This is called regeneration.

The regeneration process is done within one of the air dryer towers, the one that is not active. There are two techniques of regenerating the desiccant: by using hot air or by using dried compressed air.

In the hot air method, a separate system involving a fan with an electrical heater is used to push the hot air through the desiccant in order to dry it. This is just normal air extracted from the compressor room.

There are also specialised dryers available for use with screw compressors that are free of oil, which used the heat from the compressor to regenerate the desiccant (and consequently saving energy and money). This kind of dryer consists of a rotating drum. One-quarter of the air is regenerated, while the rest is drying the compressed air.

A third method of drying the desiccant is by using dry, compressed air. This method is typically used in the smaller dryers and is generally not suitable for the bigger dryers. With this method, a part of the compressed air that has been dried is used to regenerate the desiccant. This means that even less compressed air is made available for your tools and machinery.

Nasta Compressed Air Services is a company, founded back in in 1994 by Mr. Jan de Jong, operates from Alberton, Johannesburg Gauteng with over 27 years’ experience in the compressor industry. Nasta Compressed Air Services is fully equipped to deal with any kind of service, repairs or refurbishment on any compressor. So, though one might know how to operate the machinery, the servicing and repairing of the machinery is Nasta’s area of expertise.