Without seeing drawings & knowing the design intent of the conveyor it is impossible to give you an accurate solution. But along the lines that Roland is correctly directing you, is it possible to install enough shimming stools (stands) for the idlers to accommodate the necessary concave curve? As Rowland says this information and solution is best to be completed by a design firm that understands the requirements. ■

We are somewhat in the dark here:

What is the throughput;

What material;

Belt width;

Conveyor lengths involved;

Filling factor;

Speed;

Reason for no vertical curve.

You might care to speed the belt up and put a couple of very smallest pulleys very close together: rather like an ultra compact tripper. Then you would have to establish a condition of no fall back or run back. Your customer clearly has no idea: so anything is possible. ■