16 Tex. Admin. Code § 13.26
Design and Construction of Cylinders, Pressure Vessels, and Vapor Recovery Receivers
Effective Oct 15, 199318 TexReg 6456Source Note: The provisions of this §13.26 adopted to be effective November 15, 1990, 15 TexReg 5936; amended to be effective October 15, 1993, 18 TexReg 6456.Texas Secretary of State
- (a) Cylinders and pressure vessels shall be fabricated of steel, aluminum, or composite materials.
- (b) Cylinders shall be manufactured, inspected, marked, tested, and retested in accordance with United States Department of Transportation (DOT) regulations and exemptions for compressed natural gas (CNG) service. Fuel supply cylinders shall have a rated service pressure of not less than 2,400 psig at 70 degrees Fahrenheit. Cascade storage cylinders shall have a rated service pressure of not less than 3,600 psig at 70 degrees Fahrenheit. Steel cylinders shall be manufactured and tested in compliance with DOT 3AA specifications. Fiber reinforced plastic and full composite cylinders shall comply with DOT FRP1 standard. Fiber reinforced plastic and hose wrapped composite cylinders shall comply with DOT FRP2 standard. Vapor recovery receivers shall have a minimum rated service pressure of 250 psig and be manufactured, inspected, marked, tested, and, if applicable, retested in accordance with DOT regulations or the American Society of Mechanical Engineers (ASME) Code.
- (c) DOT regulations requiring "+" (plus) and "*" (star) markings on DOT cylinders shall not apply to CNG cylinders.
- (d) Pressure vessels and containers other than cylinders shall be manufactured, inspected, marked, and tested in accordance with the "Rules for the Construction of Unfired Pressure Vessels," ASME Boiler and Pressure Vessel Code, Section VIII (Division I or II).
- (e) In addition to other marking requirements, cylinders shall be labeled with the words, "FOR CNG ONLY," in letters at least one inch high in a contrasting color, and in a location which will be visible after installation. Each cylinder in a cascade need not be labeled provided the cascade is labeled on each visible side. Decals or stencils are acceptable.
- (f) Field welding or brazing for the repair or alteration of a cylinder or ASME pressure vessel is prohibited.
Source Note:The provisions of this §13.26 adopted to be effective November 15, 1990, 15 TexReg 5936; amended to be effective October 15, 1993, 18 TexReg 6456.