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TITLE 16ECONOMIC REGULATION
PART 1RAILROAD COMMISSION OF TEXAS
CHAPTER 14REGULATIONS FOR LIQUEFIED NATURAL GAS (LNG)
SUBCHAPTER EPIPING SYSTEMS AND COMPONENTS FOR ALL STATIONARY LNG INSTALLATIONS
RULE §14.2416Installation of Valves

(a) Valves shall be installed to prevent leaking or malfunction due to freezing. Cryogenic liquid valves shall be installed at an angle greater than 45 degrees from horizontal.

(b) Isolation valves shall be provided on container, tank, and vessel connections, except for connections:

  (1) for relief valves. Shutoff valves are only permitted at connections for relief valves in accordance with ASME Code, Section VIII, Division 1, Paragraphs UG-125(d) and Appendix M, Paragraphs M-5 and M-6;

  (2) for liquid level alarms required by §14.2501 of this title (relating to Liquid Level Gauging); or

  (3) that are blind-flanged or plugged.

(c) Shutoff valves shall be located inside the impounding area as close as practicable to the containers, tanks, and vessels.

(d) Internal valves shall be designed and installed so that any failure of the nozzle will be downstream of the seat of the internal valve itself.

(e) The number of shutoff valves installed shall be kept to the minimum required for efficient and safe operation of each facility.

(f) Piping systems shall be designed to limit the contained volume that could be discharged in the event of a piping system failure. Sufficient valves which can be operated both at the installed location and from a remote location to shut down the process and transfer systems in the event of an emergency shall be installed.

(g) Container connections larger than one-inch pipe size through which liquid can escape shall be equipped with:

  (1) a valve which closes automatically if exposed to fire; or

  (2) a remotely controlled, quick-closing valve which shall remain closed except during the operating period;

  (3) a fail-closed valve; or

  (4) a check valve on filling connections.

(h) ESD valves shall be single-purpose valves.

(i) Valves and valve controls shall be designed to permit operation under icing conditions, if such conditions are possible.

(j) Powered controls shall be provided for emergency shutoff valves that would require excessive time to manually operate during an emergency or if the valve is eight inches or larger in size. A means for manual operation shall also be provided.


Source Note: The provisions of this §14.2416 adopted to be effective May 26, 2003, 28 TexReg 4100; amended to be effective December 24, 2012, 37 TexReg 9921

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