This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of round tube belt conveyors. This standard applies to pipe belt machines that use several rollers to form a regular polygonal roller group to force the conveyor belt to form a circular tube shape and continuously transport various powdery, granular, lumpy and other loose materials. This standard does not apply to other types of tubular belt conveyors.