Fired Jacketed Steam Kettles

Fired Jacketed Steam Kettles 1. Fired jacketed steam kettles are acceptable for installation if constructed and stamped in accordance with Section I, IV, or VIII, Division 1, of the ASME Boiler Code and registered with the National Board. 2. Gas-fired jacketed steam kettles may be constructed under the rules of the ASME Pressure Vessel Code, Section VIII, provided the following additional requirements are met: 3. Welded joints in contact with products of combustion shall be of Type No. 1 of Table UW-12. 4. When parts subjected to pressure are made of carbon steel material, the minimum thickness shall be 1/2 inch. The minimum thickness of stainless steel or nonferrous pressure parts shall be as specified in the applicable part of Subsection C. 5. When in contact with products of combustion, carbon steel material shall be pressure vessel quality and austenitic stainless steel parts shall be of either extra- low carbon or stabilized grades. 6. Structural grade carbon steel shall not be used for any pressure part. 7. The operating pressure of the jacket shall not exceed 50 psig. 8. Vessels constructed under this rule shall be inspected by an authorized inspector and shall not be marked with the UM Symbol regardless of volume. 9. No steam or water shall be withdrawn from the jacket for use externally to the vessel. 10. The capacity of the safety valve in pounds of steam per hour shall be at least equal to the BTU rating of burner divided by 1,000. 11. The jacket shall be furnished with the following minimum appurtenances and controls: a. A pressure gauge. b. A water gauge glass. c. A separate connection, fitted with a check valve and stop valve, for adding water to the jacket (the water may be added while the vessel is not under pressure.) 12. An automatic gas valve controlled by pressure or temperature to maintain the steam pressure in the jacket below the safety valve setting. 13. A low water cut-off that will cut off the level to the burner if the water in the jacket below the lowest permissible water level as established by the manufacturer. 14. A safety pilot control that will cut off the fuel to both the main burner and the pilot burner in case of pilot flame failure.