What is an air pig

What is an air pig

A compressed air tank, or “carry tank,” is a handy workshop or garage tool that allows you to store compressed air in a portable, easy-to-use unit. You fill up the tank with compressed air, using any type of air compressor, then carry the tank to wherever you need it. Compressed air tanks are most commonly used for filling up tires—on cars, bicycles, trailers, ATVs, etc.—but they’re also useful for applications using a blow-off tip. Its relatively light weight and large size make a portable compressed air tank more useful in the field than a portable air compressor in many situations. The tanks typically are too small for operating air tools for more than a few quick operations.

What Is a Portable Compressed Air Tank?

A compressed air tank is a pressure vessel that holds air compressed under pressure. It releases this air on an on-demand basis through the use of a valve. Though some air tanks might be stationery, they can also be portable.

Parts of a Portable Compressed Air Tank

The components of a portable compressed air tank provide all the features you need for easy and safe use. You’ll typically find the following components on these tools:

  • Air fill valve: the valve that you connect to when filling the tank with a compressor
  • Air shutoff valve: a knob that turns to prevent air from leaking out of the tank when it’s not in use
  • Air pressure gauge: indicates the air pressure inside the tank as well as how full the tank is.
  • Pressure tank: the pressure-rated tank that holds compressed air
  • Flexible hose: the hose for delivering compressed air from the tank, which may attach with a threaded fitting or a quick-connect fitting
  • Universal fitting: a universal quick-connect fitting to allow easy changes of hose types


When filling a portable compressed air tank, watch the pressure gauge carefully. You never want the pressure to exceed the manufacturer’s recommendation. You’ll also want to underfill the tank a bit to allow the air to expand with heat without worry of potential rupture of the tank.

How to Use a Portable Compressed Air Tank

Understand the Sizes

Compressed air tanks come in different sizes, with capacities measured in gallons of compressed air. Common sizes include 5, 7, 9, 10, and 11 gallons. A 10-gallon or larger size is likely to be more useful for a variety of applications, while a small 5- or 7-gallon tank is highly portable and takes up less space.

Estimate What Size You Need

To estimate how the tank capacity translates to practical air volume, keep in mind that 7.5 gallons of tank volume equal 1 cubic foot of volume. A small car tire has a volume of approximately 1 cubic foot. That means a 7-gallon air tank does not have quite enough capacity to fill a small car tire that’s completely flat.

Consider the Rating

In addition to capacity, compressed air tanks have a maximum pressure rating measured in pounds-per-square-inch or psi. Common ratings range from 125 psi to over 150 psi. This rating indicates the maximum amount of air pressure the tank can safely handle. However, it’s a good idea not to fill the tank to its maximum pressure level, because air pressure increases with heat. So, for example, if you leave a tank in the sun the pressure inside the tank will rise even without adding more air. If the tank is completely full, the pressure could exceed the rated maximum pressure and cause a rupture.

Choose and Fill Your Compressor

If you need compressed air in any remote location where there’s no electricity to run a compressor, you can fill up an air tank at home by using an air compressor; if you don’t have one, you can use the compressor at a gas station or hardware store. Simply attach the fill nipple to the tank and use the compressor as you normally would to slowly fill the tank, watching the pressure gauge to be certain the pressure doesn’t rise too quickly or too high.

Air Receiver Tanks

Absolutely essential to any compressed air system, air receiver tanks not only serve as temporary storage, but they also allow your system to perform more efficiently.

Because of the immense pressure they contain and because of their importance to a system, they must be built to be exceptionally durable and strong.

To be sure that yours will last you many years to come and will be able to handle the pressures of everyday use, it is absolutely essential to purchase from reputable dealers and brands.

An air receiver tank is an important component of a compressed air system. The tank is sized 6 – 10 times the flow rate of the compressor system. The receiver tank is usually 150 cubic feet (minimum) for compressors with a rating of 25 scfm at 100 psi.

The tank is a reservoir of compressed air that can be used during peak demand. It removes water from the compressor system by cooling the air. The tank reduces pulsation in the system. The pulsation is usually caused by a cyclic process downstream or a reciprocating compressor.

The air tank compensates for peak demand. This balances the supply of the compressor system with the increase in demand.

There are many types of applications requiring air receiver tanks, including improving speed or torque, storage to protect from pressure fluctuations, storage to meter a high flow-rate application into a system, and more.

No matter the use, it’s important to size it to your needs. You size a tank based on the compressor output, system size and air demand cycles. One method to estimate the receiver size is this formula:

V = (Q x Pa) / (P1 + Pa)

V = receiver size in cubed feet
Q = compressor output in cfm
Pa = standard atmospheric pressure in psia
P1 = compressed pressure in psig

Compressed Air Systems can help you with air tanks and as an authorized Kaeser and Powerex dealer, we offer some of the highest-quality, epoxy coated tanks on the market today.

Choose from both new and used models to get the quality you deserve while still staying within your budget.

Ranging in volume from 30 to 8,000 gallons, we have air receiver tanks to suit any need. Plus, if you’re not sure which size is right for you, the systems specialists at our facility can advise you and help you figure out which air receiver tanks fit your requirements.

Call or e-mail us today for more information to find out how we can help you with your system. We can also provide you with a wide selection of vital products, including 5 gallon, 30 gallon, and 80 gallon products, oil free, continuous duty options, thread floor flanges, air blow guns, L port valves, 90 degree elbows, stainless steel vacuum gauges, and even a portable carbon monoxide monitor.

Compressed Air Systems can provide the highest quality, epoxy coated air receiver tanks to suit your specific needs. Choose from old and new models that meet your budget. Our wide selection of receiver tanks includes 5-gallon, 30 gallon, and 80 gallons. Contact us today for more information about air receiver tanks that fit your requirements.

In modern agriculture, it is necessary to optimize and streamline production to deliver the best results continuously. To perform optimally, the pigs require their surrounding environment to be perfect.

The livestock house climate is one of the most critical factors for the animals’ well-being. It puts high demands on the ventilation system, ensuring the correct temperature, air quality, and humidity, regardless of the climate conditions.

The LPV system is a classic negative pressure system used for ventilation of pig production facilities. The system is intended for temperate regions of the world, and it can be adapted to most livestock buildings.

In an LPV system, the wall, ceiling, or roof inlets supply fresh air. During cold periods, fresh air is mixed with the housing air before it reaches the area occupied by the pigs.

The LPV+ system is a classic negative pressure system used for ventilation of pig production facilities. The system is intended for hot climatic zones of the world.

In an LPV+ system, the ceiling inlets supply fresh air. During cold periods, fresh air is mixed with the housing air before it reaches the area occupied by the pigs. The air is taken in via a well-insulated attic space. It ensures that the air is not unnecessarily heated before it enters the livestock house.


Combi-Diffuse ventilation is a negative pressure system for pig production in the temperate parts of the world.

The Combi-Diffuse system consists of a ceiling made of special ceiling panels that have an open surface structure. The negative pressure causes the air to enter through the open structure. The ceiling panels reduce the air velocity, ensuring there are no draught discomforts for the animals during cold periods.

During warm periods, ceiling inlets provide extra ventilation.

Equal Pressure

The equal pressure system is a ventilation system used for pig production facilities. The system is intended for temperate regions of the world and can be adapted to most livestock buildings.

In an equal pressure system, roof inlets supply the fresh air, and the outlet is conducted through chimneys, both with active fans that create a neutral pressure.


Combi-Tunnel is a fully automatic all-weather system that provides the poultry the best possible productivity conditions when the outside temperature changes from very cold to very hot.

The system automatically adapts the ventilation according to the outside temperature, production type, and age of the animals.

When the outside temperature is low, the system keeps the temperature and air humidity at an ideal level by removing excess humidity and heat generated inside the livestock house.


In a Tunnel ventilation system, the air intake is located in the sides or the house end at one end of the building. The air intake is lined with cooling pads. Different types of air intake are available, which you install in connection with pads or high-pressure cooling to cool down the incoming air.

At the opposite end of the tunnel opening, large gable fans create a cooling air current (chill effect) along the longitudinal direction of the livestock house. Depending on air humidity, it is possible to lower the temperature perceived by the animals substantially.

Air filtration

The ventilation system with air filtration is used for ventilation of pig production facilities. The system is intended for temperate regions of the world, and it can be adapted to most livestock buildings.

Positive pressure ventilation characterizes the solution. It ensures that the air enters the livestock house through filters and not via leaks in the building. It is a real risk in livestock houses with negative pressure ventilation, especially in connection with older livestock houses.

Published online by Cambridge University Press: 02 September 2010

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Air temperatures were measured every 2 h in 12 growing-finishing pig houses. All houses were operated on the all-in, all-out, principle. Data were collected for two fattening periods in each house. Stocking density, feeding system, pig type, and the farmer’s skill were standardized. Every 2 weeks, the houses were visited and live weight, mortality rate, the incidence of coughing and tail biting, and the extent of dirty lying areas were recorded.

Air temperature limits could be isolated from the complex of factors affecting behavioural and health problems of pigs observed within these experiments. Sensitive periods within the growth period of the pigs seem to exist. At the onset of the fattening period (20 to 30 kg), pigs which have been transported from other farms need special care. During summer, mortality rate was lowered when the periodicity of the temperature cycles was lowered for 40- to 50-kg pigs, whereas for heavier pigs the mean maximal air temperature was important also. With respect to coughing, a statistically significant negative relation with the air temperature in the pig house was found for all weight classes, with interactions from the number of different temperature cycles within a 24-h period. In order to avoid dirty lying areas for 20- to 40-kg animals, air temperatures should be between 20 to 24°C, whereas for diarrhoea, animals of 40 to 50 kg were especially sensitive to the occurrence of low air temperatures. For minimizing tail biting, an optimal air temperature range of 20 to 22°C is suggested.