Fired Storage Water Heaters and Supply Vessels

Fired Storage Water Heaters and Supply Vessels 1. Minimum Controls -- All fired storage water heaters and supply vessels shall be equipped with the following controls and devices: a. Operating temperature control; b. High-limit temperature control; c. Positive flame failure cut-off; d. Approved pressure-temperature relief valve, set at or below the safe working pressure of the vessel, with such setting satisfactory for the application. 2. Location -- All fired vessels and heaters shall be so located as to provide access to the controls, safety relief valve and drain. 3. Discharge Lines -- When a discharge line from a relief valve is installed, it shall not be reduced but shall be full size and be piped to a safe location, graded down. 4. Relief Valve Testing -- The operator shall manually test the relief valve once each month. 5. Alternative Use -- Storage water heaters and supply vessels, fired or unfired, shall not be used as a heating boiler.