Opening a vessel under pressure can result in a rapid release of pressure and ejection of the material inside the vessel. DO NOT ATTEMPT TO OPEN A VESSEL UNDER PRESSURE! Always make sure a vent path for the vessel is opened and the corresponding pressure gauge reads zero prior to loosening the vessel closure bolts.
Practical guidelines on how to ensure a safe working environment when handling hydrocarbons:
A well-ventilated area.
The absence of ignition sources within a radiant of 3 metres from the system.
Wearing protective equipment (gloves, glasses) is also essential, as hydrocarbon refrigerants burn like HFCs.
Making use of a simple leak detector, that is suitable for hydrocarbons (do not use standard leak detector).
Hydrocarbon Recovery Machine: make sure that the machine is hydrocarbon friendly and that the electronics are sealed.
Recovery of the refrigerant: Unlike in the UK, where small amounts of the refrigerant may be vented, in the US this is not currently possible. Hence, refrigerant recovery needs to be employed.