PURPOSE: To prevent stoppage of granular powder in a transport pipe and an obstacle to transport during operation of pneumatic transport equipment by disposing turbulent flow means incorporating a plurality of cooling air ducts on suitable places of the transport pipe in such a manner as to clamp the pipe.

CONSTITUTION: Pressure of a fluid in a transport pipe is gradually decreases as it becomes distant from a compressor, so that air (a) and granular powder (b) moving in the pipe are passed through turbulent means S successively disposed at suitable places of the transport pipe. At the time of this passing, turning is applied to an air flow (a) to be pressurized and accelerated to promote the transport of the granular powder by cooling air dusts disposed at equal spaces on the turbulent means S in such a manner as to be axially at the same angle and be inclined inward in the same direction. Accordingly, stoppage of granular powder due to gravity sedimentation in the transport pipe or an obstacle to transport such as blocking of the pipe in pneumatic transport for granular powder at comparative long horizontal distance.