How often should a reusable container for refrigerants be hydrostatically tested and date stamped?

A reusable container for refrigerants should be hydrostatically tested at least every five years, as per regulations established by the U.S. Department of Transportation (DOT) and other safety standards. Each container should be date stamped upon passing the test to indicate its compliance. Additionally, any container showing signs of damage or wear should be tested sooner. Regular inspections and maintenance are also essential to ensure safety and reliability.