- (a) Direct gas-fired vaporizers shall be constructed in accordance with the requirements of the ASME code applicable to the design of the particular vaporizer.
- (b) Vaporizers may be directly connected to the liquid portion or the vapor portion of the storage container, or both.
- (c) Vaporizers shall be located outside of buildings except those buildings devoted exclusively to gas manufacturing and distribution operations, but may be located in a separate house or shed of fire-resistant construction, well ventilated at points near floor and roof.
(d) Vaporizers shall have a relief valve providing an effective rate of discharge in accordance with the following formula:
- (1) obtain the total surface area by adding the surface area of the vaporizer shell in square feet directly in contact with LP-gas and the heat exchange surface in square feet directly in contact with LP-gas;
- (2) obtain the minimum required ratio of discharge in cubic feet of air per minute, at 60 degrees Fahrenheit and (at atmospheric pressure 14.7 psia) from §9.921 of this title (relating to Appendix A).
- (e) Vaporizers shall be provided with an effective means of preventing liquid from passing from the vaporizer into the discharge gas piping.
- (f) Vaporizers shall be provided with a means of manually turning off the gas to the main burner and pilot light.
- (g) Vaporizers shall be equipped with automatic safety devices to shut off the flow of gas to the main burners if the pilot light should fail. Where the flow of gas through the pilot exceeds 2,000 BTU per hour the pilot shall also be equipped with an automatic shut-off device.
- (h) Pressure-regulating and pressure-reducing equipment, if located within 10 feet of a direct gas-fired vaporizer, shall be separated from the open flame by a substantially airtight fire-resisting partition or partitions.
- (i) Direct gas-fired vaporizers shall be spaced from any building, and adjacent property line, roadway, highway, and railroad right-of-way as indicated in Figure 1.
- (j) No directed gas-fired vaporizer shall raise the vapor pressure within the storage container to a pressure in excess of the design working pressure of the container.
Source Note:The provisions of this §9.203 adopted to be effective January 1, 1976; amended to be effective January 1, 1988, 12 TexReg 3157; amended to be effective June 1, 1989, 14 TexReg 1927.