(a) In addition to NFPA 59A §§9.4.2.3 and 9.4.2.4, the number of shutoff valves installed shall be kept to the minimum required for efficient and safe operation of each facility.     
      (b) 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.     
      (c) ESD valves shall be single-purpose valves.     
     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; amended to be effective February 15, 2021, 46 TexReg 1044