Installation of screw conveyors for day mixer mortar line

We exported to Iranian customer of a dry-mixed mortar factory 20 sets pipe screw conveyors and U shape screw conveyor last January, now the customer has started the installations.
Pipe screw conveyor and U shape screw covneyors are the main units for powder, granular materials' conveying in industry. Such as building material, chemical industry, power industry, metallurgy,coal industry, and so on.