To Thaw Frozen Hydrant. A simple method to thaw a frozen fire hydrant is to pour sulphuric acid into the barrel of the hydrant through the nipple.
Edward A Waters, chief engineer of fire department, said: "The test of the thawing device on the 14th of February of this year was an exceptionally severe one, in that the hydrant was frozen …
Winter Hydrant Maintenance: How to Thaw a Frozen …
Using steam on the frozen hydrant to heat it ensures that the temperature never goes very far above boiling, preventing the serious damage …
The safe way of thawing a frozen hydrant uses steam, so that your hydrant’s temperature doesn’t exceed the boiling point. This helps prevent the …
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Blowtorch vs. Frozen Fire Hydrant Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher