It is the responsibility of the _____ to furnish documentation certifying that all installed piping materials are cleaned for oxygen service.

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

Answer: (B)

Oxygen service requires all piping materials to be cleaned to remove hydrocarbons and other contaminants that could ignite in an oxygen-rich environment. The person who actually performs that cleaning and provides the certification that it has been done is the installer, who has direct responsibility for the preparation and condition of the materials used in the system. The installer issues the cleaning documentation as part of the installation package, and this documentation is then available to the verifier and to the authority having jurisdiction if review is needed. While regulators and the verifier play roles in ensuring compliance, they do not typically generate the cleaning certificate themselves; the installer is the one who furnishes it.