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Technically speaking, it is a container used for the storage of monophasic or biphasic gases, of service pressures up to 300 bar, manufactured as of seamless and/or fiber, with volumetric capacity of 1 to 150 liters of water.

In the first place, we should explain that the correct unit and the unit used all over the world to measure the real capacity of any cylinder and for any monophasic gas is the volumetric capacity of water that is measured during its manufacture and printed on the warhead of the cylinder in liters, as required by all national and international standards. The cubic meter unit is adopted only in the supply system of the station at the time in which the gas is being measured for charging.

Why?

1. As explained above, the physically available volume for filling is that informed on the warhead, in liters of water, since the capacity in cubic meters varies because of several factors.

2. Actually, depending on the supply pressure of the station, one can fill less or more one same cylinder. ANP (Agência Nacional do Petróleo) regulates 220 bar as the maximum supply pressure.
Important: Some stations are supplying at higher pressures, which is contrary to the regulation and, therefore, the practice is unsafe and totally not recommendable.

3. Another very important factor is that the cylinder sometimes gets oil on its inside, derived from the compressors, during the load. This oil takes up useful space, that is, that initial available volume decreases.

4. The molecular friction of the gas derived from the filling speed can also cause heat, thus reducing gas storage capacity in the cylinder.

5. By the time of the first load, the presence of air inside the cylinder is common, which is also a capacity reducer, a fact which tends to be eliminated in the subsequent loads; however, residual gas will remain, which will also reduce the amount of gas placed by the station.

6. But perhaps a fact that few realize is the filling temperature. Just check the ABNT standard – NBR 13200 – and see how complex and variable the gas volume of a cylinder is as a result of the filling temperature. Several charts and formulas can be seen there which, ultimately, lead to the conclusion that filling a cylinder at 20oC and the same at 40oC for instance, can present quite different results in the volume of gas packed in the cylinder.

That is why when we talk about cylinder volume, we must talk about LITERS OF WATER, I repeat, and not in cubic meters. It is not wrong, but that requires a number of assertions to become true.

It is advisable that sealing tape be used, which works as a lubricant in this valvulation process. Liquid Teflon can also be used; however, cure time instructions must be followed as defined by the manufacturer. Any other material (such as grease, string, etc.) is not recommended in this process.

No. This is a high risk operation. Do not try to remove the gas from the cylinder without adequate equipment for depressurization, since this will imply risks. The cylinder should be handled by technically trained people.

The cylinder should not be re-used and must be destroyed. The exposure of the cylinder to any source of excessive heat or welding should be avoided. Exposed at high temperatures, the cylinders are subject to changes in their characteristics as to their resistance, becoming fragile. Read the Cylinder Manual and the adhesive fixed on the body of the same. The instructions described therein are very important and refer to your safety and preservation of your property.

In case of fire in your vehicle, do not try to extinguish the fire. Get away immediately from the fire up to a minimum distance of 50 meters and call the Fire Department, which must be informed that your vehicle runs by natural gas. Such information will help the work of our firemen.

Never replace the cylinder for another type of reservoir: kitchen gas containers or other compressed air tanks cannot be used together with NGV gas cylinders or replace them, since the NGV cylinders are designed for high pressure storage (200 bar). The MAT cylinders are designed to support this high pressure safely while the other types of cylinders are not designed for high pressure.

No. The behaviors of the gases vary. Some are even corrosive, and may even damage the cylinders internally, cause ruptures, etc. This reservoir (cylinder) was developed specifically for NGV.

Yes. Never expose the cylinder to corrosive products. Be careful with the acids; avoid leaving batteries, for instance, near them.

Never touch the pressure relief device or the safety device of the valves. As the own name says, that is to bring safety. If there is any problem, go to a converter to have your valve changed.

Installation or removal must be performed only by companies registered by Inmetro and qualified to do a good job, which warrants the safety and the intended economy. The user should not allow other non-qualified people to handle this equipment. If it is necessary to remove the cylinder, it must be totally depressurized. In case tin-shop service is necessary on the vehicle, which involves weld or blowtorch near the cylinder, the latter must be removed previously to the service.