Hot Tapping 2 : The technique of welding and drilling on in-service tanks or containers that contain flammable, combustible, or other hazardous substances
NFPA 326 Standard for the Safeguarding of Tanks and Containers for Entry, Cleaning, or Repair, 2005 ed. https://www.nfpa.org/assets/files/AboutTheCodes/32 6/326-F2009-ROC.pdf, (Std: Safeguarding of Tnk and Cont for Entry, Cleaning, or Repr - Amer) {298 NFC}
NFPA 329 Recommended Practice for Handling Releases of Flammable and Combustible Liquids and Gases, 2005 ed. https://www.nfpa.org/assets/files/AboutTheCodes/32 9/329-F2009-ROP.pdf, (Recmm Prac: Hndlg Releases of Flamm and Comb Liqd and Gas - Amer) {299 NFC}