Reusable cylinders must have Department of Transportation (DOT) stamp of approval

At higher temperature refrigerant reacts with water /moisture to form acids

Stratosphere is  located at lower part of Earth’s atmosphere above Troposphere. Troposphere extends from Earth’s surface to 10 miles. Stratosphere extends from 10 miles to 30 miles above Earth;s atmosphere

Reclaimed refrigerant should qualify ARI 700 purity specifications. This can be achieved by passing refrigerant through single or multiple stages of equipment such as filters.

R-134a (HFC) is a possible replacement for R-12 (CFC) in new household refrigerators. R-134a pressure-temperature characteristics similar to R-12. However some modifications such as lubrication, thermal expansion valve, compressor & filter dryer may required to be changed

Pressure Relief Valves are installed in parallel such that failure of one valve will not compromise the safety of the cylinder.

Refrigerants are generally heavier than air. In closed rooms when leaked it has the capacity to displace the air (oxygen) leading to Asphyxia phenomenon.

Refrigeration cylinders are stored and transported in upright position to keep pressure relief valve in contact with the vapour pressure inside the cylinder not the liquid

Ozone & oxygen molecules present in the stratosphere absorbs the Sun’s harmful UV radiation.

Azeotrope mixture is made up of two or more refrigerants which act as single refrigerant compound over its entire temperature and pressure range. Azeotrope refrigerant mixtures will not have temperature glide (temperature difference between saturated vapour & saturated liquid at constant pressure). Zeotrope & near azeotrope mixtures will have temperature glide.