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Protection of fiberglass tanks

Question asked by arnstein on Mar 21, 2018

NFPA 22 (4.2 Location of Tanks.) If lack of yard room makes this impracticable, the exposed steel work shall be suitably fireproofed or shall be
protected by open sprinklers (see A.13.1.1).
Why is there no requirements on open sprinkler for fiberglass tanks (which is flammable), but only automativ sprinklers 11.6?