What should be done if cylinders are frozen or fixed in the ground?

Using warm water to loosen frozen or fixed cylinders is the safest and most effective method to address the situation. This approach allows for a gradual thawing of ice or other materials that may have caused the cylinders to become stuck. Warm water helps to melt the ice without causing thermal shock or damaging the cylinders or their fittings, thus ensuring safety and protecting the integrity of the equipment.

The other options can pose safety risks or lead to damage. Applying boiling water could cause rapid temperature changes, potentially damaging the cylinder or its safety mechanisms. Waiting until summer is inefficient and impractical, especially if immediate access to the cylinder is required for safety or operational reasons. Trying to force the cylinders out can lead to accidents, including the risk of the cylinder rolling uncontrollably, which could endanger nearby personnel or cause damage to property.