As long as the torch is kept moving below the level of the liquid refrigerant in the cylinder so as not to create a hotspot, it is OK to heat the cylinder in this manner.

Question

Quizplus · Accepted Answer

Heating a refrigerant cylinder with a torch or any open flame is extremely dangerous and can lead to cylinder rupture or explosion due to the rapid increase in pressure. Safe practices must always be followed, including using specifically designed warm water baths or heating blankets for controlled warming.

As Long as the Torch Is Kept Moving Below the Level