How Often Must Reusable Cylinders Be Hydrostatically Tested?
How Often Must Reusable Cylinders Be Hydrostatically Tested? Federal law requires that refillable cylinders used to recover refrigerant must be inspected and hydrostatically tested a minimum of once every five years in accordance with 49 CFR Part 180, Subpart C or as specified in an applicable Special Permit as provided by the manufacturer of the