NFPA 22 (2013) Anti-Vortex Plate Specifications
NFPA 22 (2013) Anti-Vortex Plate Specifications
Anti-vortex Plate Assembly Specification
14.2.13* Anti-Vortex Plate Assembly.
14.2.13.1 The discharge outlet for every suction tank shall be equipped with an anti-vortex plate assembly.
14.2.13.2* The assembly shall consist of a horizontal steel plate that is at least twice the diameter of the outlet on a long radius elbow fitting, where required, mounted at the outlet a distance above the bottom of the tank equal to one-half the diameter of the discharge pipe.
14.2.13.3 The minimum distance above the bottom of the tank shall be 6 in. (152 mm).
A.14.2.13 See Figure B.1(o), Figure B.1(p), and Figure B.1(q).
A.14.2.13.2 Large, standard size anti-vortex plates [48 in. × 48 in. (1219 mm × 1219 mm)] are desirable, as they are adequate for all sizes of pump suction pipes normally used. Smaller plates may be used; however, they should comply with 14.2.13.
Anti-vortex Plate Illustration:
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