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  1. How To

How To

  • What to do with your old air compressor?

    I know what your thinking, you just purchased a new compressor and your asking yourself;
    "what am I going to do with this old air compressor?"  No worries, you have a few great options;

    1. If your old air compressor still has some life and you have room, keep it as a back up compressor.  Back up air compressors are UNDER RATED.  If your new compressor sneezes; the back up compressor is there to keep your plant running.   If your new compressor is due for service; the back up compressor is there to keep your plant running.  Calculate how much your plant generates per hour and calculate 8 hours of down time, it's worth having back up.  If you do hook up the old air compressor as a back up machine, stagger the pressure switches so the old compressor is set 5-10 psi lower than the load set point on the new compressor.
    2. If you purchased or have a reliable back up compressor then sell the old compressor on any social or online auctions like craigslist for local listings or ebay for online auctions.  A good rule of thumb would be $100 per 1 hp for good condition or $125 per 1 hp for great condition.  If it's a well known brand and in great-excellent condition, then you may be closer to $150-$200 per hp.  In any sale, it's always recommended to take quality photos.   And try to clean up the old compressor as the cleaner it looks, the more you'll sell it for.
    3. If your old air compressor has been decommissioned then its best to cut a large whole or cut the tank in half with a torch or cutting tool.  This can eliminate any liability if someone else takes the old compressor tank from your property.  We don't recommend it but we have heard some people cutting the old tanks into bbq pits                                                          (I hope they used food grade oil :)
    4. Salvage the old compressor for scrap.  Many clients will separate the metals for better scrap value; steel, copper (electric motor), cast (pump), etc.

    Feel free to contact anyone at the Compressor World office to discuss your old air compressor application.  Compressor World specializes in selling air compressors, air dryers and tanks to any and all fabrication, manufacturing, university, medical, automotive and granite fabrication shops

  • Do I Need a Piston or Rotary Air Compressors?

    Two of the most popular air compressor configurations are the piston type or reciprocating and rotary screw compressors. There are a few factors that set the two apart based on the way in which they have been set up and the method employed to compress air.


    Let us start with piston or reciprocating air compressors. These are easily the most commonly used air compressors across the world. They run on the same mechanical principle as the combustion engine. A crank that turns a connecting rod, which in turn moves the piston up and down inside the cylinder head. The inlet valve lets air into the cylinder when the piston is in its lowermost position, the latter is then driven upward to compress the air, converting electric energy to kinetic energy in the process. A typical piston air compressor is oil-cooled, that results in the release of oil residue when the compressed air is discharged.

    Rotary air compressors, on the other hand, are typically configured with two interlocking helical rotors fit with a small gap between them and soaked in an oil bath inside a housing. The inlet valve lets air in, which is compressed in the space between the screws when they turn, reducing the volume and increasing the pressure.

    There are oil-free rotary screw air compressors available as well. In fact, there are some air compressors that even come equipped with just one screw, but again, these are not very common.

    Here we have a list of factors compared which will let you determine which of the two types of compressors might suit your needs better.

    Rotary air compressors and piston compressors - Comparison

    1. Maintenance and wear and tear – In piston compressors, the wear and tear is greater due to a large number of moving parts. This results in more maintenance compared to a rotary screw processor. However, because of the simple mechanical setup of a piston compressor, it is easier to maintain and fix, despite the greater frequency of maintenance required.


    1. Operating temperature, noise and vibration – Typically, a rotary compressor has lower operating temperatures than piston compressors. Friction is the lead cause for this, because the rotors in the screw compressor don’t come in contact, whereas piston rings are in constant contact with the cylinder walls, creating greater friction and raising temperatures. The former also generates less noise and vibrates lesser than the latter due to the same reason.


    1. Air flow and operation time – Because of the high temperatures in a piston type compressor, it cannot be run non-stop due to the risk of overheating. Furthermore it is also typically run at only 50% of its total CFM or air flow capacity. The rotary screw compressor, however, is capable of being run continuously. You can also purchase a rotary screw compressor that is rated as close as possible to your required air flow capacity rather than one rated at double the capacity.


    1. Space required and energy efficiency – Since rotary screws are encased next to one another in one chamber, the whole setup usually takes up less space than a piston compressor which requires cylinder heads for the vertical movement of the pistons. The former are also more energy efficient than the latter with fewer transmission losses as well. However, the effects are only discernable in compressors of 20 HP or more horsepower.


    1. Pressure ratio and volume – The compression range is much greater on a piston configuration when compared to a rotary screw type. There is also more flexibility in terms of pressure ratio and capacity. However, in rotary compressors, while the flexibility is limited, the comparative volume capacity is much greater than that of reciprocating air compressors.


    1. Oil carry-over – Piston compressors typically discharge more oil into the stream of compressed air than rotary screw compressors do. Due to the high-friction moving parts, wear-and-tear leads to more oil carry-over than in rotary screw compressors.


    1. Price – Due to the above mentioned factors, the cost of a piston compressor is a lot lesser than that of a rotary screw compressor.

    Now that you know the major differences between the two type of compressors – piston and rotary, and what advantages and disadvantages either brings to the table, you can make an informed investment. Before you decide either way, make sure to check out some great deals and one of the widest ranges of compressors available at our online store. If you have more questions, our air compressor experts at Compressor World will be more than happy to help you out.

  • Air Pressure Loss - What Size Air Pipe Should I Install?

    The most common questions we have with air lines and storage air tanks.

    Customer; I don't have enough pressure in the far end of my warehouse and I need a new compressor!
    Answer:  That may not be the case, what size air lines do you have?   Are the air lines looped?

    Customer; I don't need a tank, I use my air lines for storage
    Answer; Tanks are used to help the energy efficiency of the compressor, air lines are used to distribute the air evenly throughout the plant.  Compressors would fast cycle without a tank which could lead to higher energy costs and maintenance.

    Customer; What size airline should I install with a 25 hp rotary screw air compressor, 100 CFM.
    Answer; With 100 CFM of air, you will have 7.69 psi drop for every 100' of pipe (90 degree turns are equivalent to 25' of pipe). Continue reading

  • If Air Compressors Could Talk... What would they say?

    If Air Compressors could talk, what would they would say....

    Would it be;

    Look At Me Look At Me

    We receive calls from customers replacing their air compressor that is 20-30 years old, in some cases their father purchased the compressor when they first started the business and it finally failed or needs parts that are obsolete. So they're ready to purchase a new machine. When we hear these stories, we know the owners maintained the compressor and changed the oil and filters on a regular basis.

    Get in a routine and inspect the air compressor daily and take notes. Keep a maintenance log in the compressor room and log the following;

    • Ambient Temperature
    • Discharge Air Temperature (Rotary)
    • Oil Level
    • Oil Temperature
    • Voltage

    Note any oil leaks and fix them as soon as possible.

    Continue reading

  • Advantages of Scroll Compressors

    10+ years ago hospitals, laboratories and other fabricators with critical air uses purchased oilless piston compressors. Piston compressors were loud, created vibration and didn't last long, even with proper maintenance. Once these oilless scroll compressor were introduced, they became a natural replacement for loud piston compressors.

    Advantages with Oilless Scroll Compressors
    The biggest advantage using a oilless scroll compressors over a piston compressor would be the duty cycle and the noise level. Oilless Scroll Compressors are rated for 100% duty cycle (oilless piston compressors are rated for 50-70%). The scroll technology is also much quieter (57 dBA vs. 70-85 dBA).

    Common Applications

    • Medical Air
    • Laboratory
    • Manufacturing
    • Air Brakes

    Continue reading

  • How and Why Rotary Screw Compressors are Used In The Locomotive Industry

    A number of advances have been made in the field of technology, over a long period of time. However, the technology that is used in the railroad industry specifically with regard to on board locomotives, have changed very little. Take the air brakes for example – these have remained virtually unaltered.

    In the locomotive industry though steam technology would still work, the kind of efficiency and power that technology today demands would be impossible to achieve. Another loophole in the locomotive industry at the current times is the wide-scale use of less efficient reciprocating compressors. The way ahead for improvement in this industry is to replace reciprocating compressors with rotary screw technology.

    Continue reading

  • Rotary Screw Compressor Buyer's Guide

    Though there are a number of different types of air compressors available in the market, there is none like a rotary screw air compressor. It is the best compressor when it comes to performance.

    It can be said with 100% surety that nothing works like a rotary screw compressor because it is designed to work flawlessly and uninterruptedly for 24 hours all 365 days over a number of years. What makes us represent a rotary screw air compressor in such positive light? The following factors do:

    1. Savings on Energy: One of the main reasons why a number of people love the rotary screw compressor is that fact that it is highly efficient and hence saves a lot of energy. While the upfront cost of a rotary compressor is higher as compared to other types of compressors, it all gets equal when you have to spend comparatively very little on the maintenance and energy cost of a rotary screw compressor while a lot goes into the maintenance and energy related cost consumption of other types of compressors.
    2. Durability and Strength: Within the range of air compressors, rotary screw compressor are considered to be the most durable ones and have a super strength, which makes them capable of running constantly for at least a decade or more. These can run efficiently for long periods of time in garages as well as factories or in some or the other kind of an industrial set up.
    3. Guarantees Clean and Fresh Air: A rotary screw compressor uses clean and fresh air and also releases clean air into the environment. This happens because of the excellent design and mechanism of the compressor. The procedure of controlling dew point in the compressor is complex; however, a rotary screw compressor has a smart enough design to keep oil and water particulates in check.

    Continue reading

  • Chicago Pneumatic QRS Air Compressors

    Chicago Pneumatic offers a full line of base, tank mounted and total air compressor systems. Each rotary screw air compressor offers a standard 1 year parts and labor warranty along with a 5 year optional extended warranty. The extended warranty covers the motor, aired, separator and cooler, the cost for this extended warranty is approximately $350.00.

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  • Best 50 Horsepower Rotary Screw Air Compressors

    Larger manufacturing plants are installing 50 horsepower rotary screw air compressors for demands between 140 and 200 CFM, any demand under 140 CFM we would recommend a 40 horsepower rotary screw compressor.

    We would recommend buying a 50 hp rotary screw compressor from one of the following compressor manufacturers as they offer some of the best air compressor warranties;

    • Mattei Rotary Vane Compressors
    • KORE Compressors
    • ELGI Compressors
    • Quincy Compressors
    • Chicago Pneumatic Compressors

    We recommend these brands because of the quality & warranty but most importantly, the aftermarket service. These brands have some of the best compressor service centers in the country.

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