This part does not apply to any of the following:
(1) the production, refining, or manufacture of LPG;
(2) the storage, sale, or transportation of LPG by pipeline or railroad tank car by a pipeline company, producer, refiner, or manufacturer;
(3) equipment used by a pipeline company, producer, refiner, or manufacturer in a producing, refining, or manufacturing process or in the storage, sale, or transportation by pipeline or railroad tank car;
(4) any deliveries of LPG to another person at the place of production, refining, or manufacturing;
(5) underground storage facilities other than LPG containers designed for underground use;
(6) refineries, pipeline terminals, or natural gas processing plants.