5706.5.7 Static protection.
FC § 5706.5.7
Static protection shall be provided to prevent the accumulation of static charges during transfer operations. Bonding facilities shall be provided during the transfer through open domes where flammable liquids are transferred, or where combustible liquids are transferred into cargo tanks or tank cars which could contain vapors from previous cargoes of flammable liquids. Protection shall consist of a metallic bond wire permanently electrically connected to the fill stem. The fill pipe assembly shall form a continuous electrically conductive path downstream from the point of bonding. The free end of such bond wire shall be provided with a clamp or equivalent device for convenient attachment to a metallic part in electrical contact with the cargo tank or tank car. For cargo tanks, protection shall consist of a flexible bond wire of adequate strength for the intended service and the electrical resistance shall not exceed 1 megohm. For tank cars, bonding shall be provided where the resistance of a tank car to ground through the rails is 25 ohms or greater. Such bonding connection shall be fastened to the cargo tank or tank car before dome covers are raised and shall remain in place until filling is complete and all dome covers have been closed and secured. Exceptions: 1. Where cargo tanks or tank cars are loaded exclusively with products not having a static-accumulating tendency, such as asphalt, cutback asphalt, most crude oils, residual oils and water-miscible liquids.
2.When flammable liquids are not handled at the transfer facility and the cargo tanks are used exclusively for combustible liquids.
3.Where cargo tanks or tank cars are loaded or unloaded through closed top or bottom connections when the hose is conductive.
