| 62 / | HD | REFRIGERATION |
| 45.1 | DF | STORAGE OF SOLIDIFIED OR LIQUIFIED GAS (E.G., CRYOGEN) {12} |
| 48.1 | ![]() | .~ With vapor discharged from storage receptacle {3} |
| 48.2 | DF | .~.~> And subsequently restored to receptacle as liquid |
| 48.3 | DF | .~.~> And subsequently used to cool receptacle |
| 48.4 | DF | .~.~> Discharge caused by ignition of combustible gas |