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APPENDIX C 30-49 B-1-4 In cases where tanks are either rendered "tem. Appendix C porarily out of service" or permanently abandoned, records should be kept of tank size, location, date of This Appendix it not a part of the re4uirementsofthis NFPA document abandonment, and method used for placing the aban- . . . but is included jar information purports only. doned tank in a safe condition. The following contains additional information and B-1-3 Procedures for carrying out each of the above recommendations bearing the same number as the text of methods of disposing of underground tanks are described the Flammable and Combustible L'quids Code to which in the following sections. No cutting torch or other flame they apply: or spark producing equipment shall be used until the tank has been completely purged or otherwise rendered C-4-4 The preferred method of storage of liquids in safe. In each case, the numbered steps given shall be car- buildings is in cutoff rooms or in attached buildings ried out successively. rather than in inside rooms because of fire department accessibility and the advantages of providing explosion B-2 Rendering Tanks "Temporarily Out of Service." venting where needed. B-2-1 Cap or plug all lines such as fill line, gage open- C-4-6.2 (a) Sprinkler system densities and areas of ap- ing, pump suction, and vapor return. Secure against plication presented in this appendix are based upon tampering. limited test data and fire experience. Design criteria in B-2-2 Disconnect piping at all tank openings. this appendix do not apply to storage in plastic drums. (See Appendix D for additional information on this sub- B-3 Abandoning Underground Tanks in Place. ject.) B-3-1 Remove all flammable or combustible liquid (b) For design criteria for specific installations, in- surance engineers, fire protection consultants, and other from the tank and from all connecting lines. knowledgeable persons should be consulted. B-3-2 Disconnect the suction, inlet, gage, and vent (c) Palletized and Solid Pile Storage. For protected lines. storage of liquids, as specified in Table 4-6.1(a), automatic sprinkler protection should be provided in ac- B-3-3 Fill the tank completely with an inert solid cordance with Table C-4.6.2(a). material. Cap remaining undergound piping. (d) Rack Storage. In protected storage of liquids ar. ranged• as specified in Table 4-6.1(b), automatic sprin- B-4 Removal of Underground Tanks, kler protection should be provided in accordance with B-4-1 Remove all flammable or combustible liquids Tables C-4-6.2(b) and C-4-6.2(c), as applicable, except from tank and from connecting lines. that racks with solid shelves should be provided with in- rack sprinklers at every tier or level. B-4-2 Disconnect piping at all tank openings. Remove C-4-6.2.1 (a) Automatic aqueous film forming foam sections of connecting lines which are not to be used fur- ther and cap or plug all tank openings. After removal, (AFFF)-water sprinkler systems for container storage of the tank may be gas freed on the premises if it can be liquids has been shown to be an acceptable method for done safely at that location, or may be transported to an providing fixed protection. (See Appendix D for addi- area not accessible to the public and the gas freeing corn- ttonal information on this subject.) pieced at that location. (b) For design criteria for specific installations, in- surance engineers, fire protection consultants and other B-5 Disposal of Tanks. knowledgeable persons should be consulted. B-5-1 If a tank is to be disposed of as junk, it should be (c) Rack storage of liquids in containers (drums of 55 retested for flammable vapors and, if necessary, rendered gal (208 L) capacity] stored on-end on wood pallets on gas free. After junking and before releasing to junk conventional double-row racks to a maximum height of dealer, a sufficient number of holes or openings should be storage of 25 It (7.6 m) should be provided protection in made in it to render it unfit for further use. NFPA 327, accordance with Table C-4-6.2.1. Standard Proceduresfor Cleaning or Safeguarding Small Tanks and Containers, provides information on safe pro- cedures for such operations.