Air Compressor FAQ
Company FAQ


Is maintenance required?

The operator would be expected to check the oil level and drain the water from the tank periodically. Various services schedules apply depending on the model of compressor and its usage. A few things to remember:• Do not run single phase off long extensions cables.• A static 3hp compressor should be wired in with a 20 amp supply and type D breakers.• No need to drain every day, just crack the drain value daily and blow any condensate out of the drain.• Keep dust off the compressor.• Where applicable remove air intake filter and clean element.• Check oil level weekly.• Always switch the compressor off at night. As any pressure drop in the system will stop and start it. 

What is oil carry over?

There will always be a certain amount of oil carry over from a compressor. When the compressor it is running hot or is being over worked, oil carry over is made worst. The hot oil fumes and then condenses in the hose and in the tools. The affect can be reduced by running the compressor as cool as possible, making sure there are no leaks and that the outlet pressure regulator on the compressor is set as low as possible. Ensure there there is plenty of ventilation. You can place a cooling fan near the unit it in hot weather. A coalescing filter can also be used to reduce oil and condensate 

Is compressed air safe?

There are safety features built into every compressor we sell. These include  pressure safety relief valves and thermal cut-outs. Only qualified technicians should be allowed to repair and service your compressor. Common sense prevails, including do not blow compressed air into your face.

What is piston displacement?

The volume of air delivered out of the compressor measured per minute in litres per minute for a given pressurePiston displacement / suction capacity or any other name is based on a recippotating piston compressor is a pure TTHEORTICAL FIGURE based on the bore, stoke and speed of the compressor. The fad is actually what comes out of the compressor after all the ineffiecncies are taken into account against a certain pressure. The higher the pressure the lower the free air delivered. Use this handy tool to convert Litres Per Min into Cubic Feet Per Minute

What does "50% Duty Cycle" mean?

If a compressor is turned on and running at a pressure of 10 bar. Whilst the compressor is being used the pump may not have to be on until the pressure drops to say 8 Bar. Then the compressor pump will turn on and increase the pressure till 10 bar is reached. The time the compressor is on compare to the time the compressor is urned off is the "duty cycle". So if the compressor is on as much as it is off then the duty cycle is 50%. Jinjing compressors are not designed to run higher than a 50% duty cycle. To prevent overheating, a thermal cut out will turn the compressor off and then turn it back on when the compressor has cooled down enough to run again. 

Why should I buy a dryer for my compressed air? I mean, what’s a little water going to hurt?

Obviously, your business does not involve using your compressed air to spray paints, or you would know of problems a little water can cause.  But water’s rap sheet is long and varied and is not limited to crimes against paint jobs.  Water in your compressed air will flush away lubricants in your air tools and air powered machines, increasing wear and causing premature breakdowns.  Also, it can mix with soluble and corrosive solder fluxes in your compressed air piping system and corrode machines and tools down stream.  Water is also corrosive when mixed with compressor oil mist.  Fortunately, water is easy to outsmart.  Appropriately sized refrigerated or desiccant air dryers effectively remove all the moisture from your compressed air.  Add particulate and coalescing filters to remove particulate and oil contamination, and your compressed air will be clean, dry and ready to effectively perform the work you prescribe for it.  However, as with your compressor, the appropriate size and type of dryer is critical.  You should request that a professional air compressor service company, such as Air Compressor Service, look at your operation and recommend the appropriate equipment.

How can I tell if my rotary machine is too big?

There are some telltale symptoms of a seriously oversized rotary air compressor:• The compressor is an oily mess,• You have to buy extra oil between services,• You are having problems with your condensate drains,• You are frequently replacing downstream filters, or• You are experiencing corrosion in your compressed air system. If you suspect your rotary air compressor is oversized, ask Air Compressor Service to inspect your compressed air system and determine if changes are indicated.

Once I know the type compressor I need, how do I determine the appropriate size?

The best way to size your air compressor is to measure your actual compressed air use for at least one week of typical operations and allow for reasonable estimates of expected changes.  Air Compressor Service can perform this service for a reasonable cost (free for our existing customers).  Industrial air compressors are too expensive to make a mistake by buying a machine too small for your application, or too big, which is the more common mistake.  One might logically assume that if a 15-hp compressor is good for your application, then a 30-hp would be better, but that is not the case, at least not for rotary machines.  Although a rotary machine (unless it is a variable speed unit) will run at a constant speed even with fluctuating air demand, if the demand is too low for a sufficient time, the machine will shut off.  Then when demand increases it will turn back on.  Frequent on/off cycling causes the machine to “burp” oil each time it shuts down which can cause a variety of problems.

What type of air compressor is best for my business?

This is an excellent question because the wrong air compressor can cost you big bucks and cause untold headaches.  Each type of compressor (reciprocating, rotary screw, and rotary vane are the primary types) has its own “pros and cons”, but it is not difficult to determine the most appropriate type for your application once you know a little about each one.Reciprocating, or piston, air compressors are the most familiar.  An industrial quality machine will last a long time with routine maintenance.  Reciprocating compressors are also very efficient because they only run when there is a demand for compressed air.  When there is no demand, they turn off, saving wear and tear on the machine and, most importantly, saving on your power bill.  In fact, most of these machines must turn off regularly to cool.  An ideal on/off ratio is 60/40.  Reciprocating air compressors are available in a wide range of sizes from fractional horsepower up through hundreds of horsepower.  A reliable rule of thumb is that each horse power will produce four cubic feet per minute (4 cfm) of compressed air at 120-150 pounds per square inch (psi) pressure.Rotary screw air compressors run continuously, producing a steady flow of compressed air.  They are suited for applications that require a constant supply of compressed air that would never give a reciprocating machine rest.  However, if the air demand decreases, a rotary screw machine will produce compressed air that is not needed.  This inefficiency will show up in your power bill.  Sometimes a rotary screw machine is used to provide a base amount of compressed air for which there is a constant demand and a reciprocating machine is used to “trim” the system, operating only when demand exceeds the capacity of the rotary screw.  This arrangement can be very efficient.  Also, newer technology variable speed motors can reduce the power consumption of rotary screw machines when air demand diminishes.  Rotary screw compressors are available in the range of five horsepower up.  Each horsepower will produce about 4-5 cfm of compressed air depending on the specific design.Rotary vane air compressors are suitable for the same types of applications as rotary screws, but they have some advantages.  They operate with fewer moving parts, have fewer potential oil leak points, and utilize a superior hydraulic-controlled inlet system.  Some air compressor service companies shy away from working on rotary vane machines because they are not very familiar with them.  Air Compressor Service has more expertise and experience with rotary vane machines than any other compressor service company in Washington State.  Rotary vane machines are generally available from two horsepower through 300 horsepower.  With proper preventive maintenance, these machines can serve well for 100,000 hours or more.

Is there any recommendations regarding ventilation of the compressor room?

All compressor rooms require ventilation. Minimum room ventilation can be calculated from the formula: Qv = 1.06 N/ T for Pack unit Qv= (1.06 + 1.3) / T for Full-Feature unit Qv = required cooling air flow (m³/s) N = shaft input of compressor (kW) T = temperature increase in compressor room (usually 7°C) If the compressor is conducted, the required ventilation is the same as the fan capacity of the compressor. This is mentioned in the instruction manual.

Why is an internal water separator drain necessary?

First, an internal Water Separator Drain (inside of the compressor) is NOT necessary. But it can have some benefits in two cases: 1) Screw without an integrated dryer: Using a water separator drain, we remove some water from the compressed air, before its delivered to the final area of use with less water content. 2) Screw with an integrated dryer: Using it before the dryer, some of the water gets removed before the dryer, this gives the opportunity to choose a smaller sized air dryer.

Why is an inverter compressor saving energy?

Because an inverter/frequency driven compressor is not producing more air than needed. A conventional compressor works within a pressure band. When reaching the higher pressure the machine goes into unload mode (the motor is running but no air is produced). When reaching the lower pressure again until it reaches its unload pressure again. An inverter/frequency driven compressor has less unload time and works towards a set pressure value, this makes the inverter compressors in general 30% more energy efficient than a conventional load/unload compressor.

What is the operating principle of an inverter compressor?

It has almost the same components as a conventional compressor but there is, of course, a few main differences. A frequency driven compressor has an integrated inverter and often a more advanced control system. The inverter adjusts the motor speed to the actual air demand. This is controlled by a sensor that measures the system pressure this is signaled to the controller of the compressor. The controller registers the pressure and sends a signal to the inverter which regulates how much air the compressor needs to produce in order to keep the set pressure.

What is normally the pay back for an inverter compressor?

The normal pay back is between 1-2 years during normal conditions and 4000 running hours per year. Not seldom we see pay backs within a year.