Who is responsible for furnishing documentation certifying that piping materials are cleaned for oxygen service?

• A. installer
• B. verifier
• C. authority having jurisdiction
• D. contractor

Answer: (A)

In oxygen service, piping must be cleaned to remove all residues that could ignite in an enriched environment. The person who actually performs that cleaning and can attest that the interiors meet the required cleanliness is responsible for furnishing the documentation. That role is the installer, who prepares the piping, applies the cleaning procedures, and provides the certification that the piping is ready for oxygen service. The verifier checks compliance, the authority having jurisdiction enforces code and accepts documentation, and the contractor oversees the project, but the certification originates from the party that did the cleaning.