There may be LOTS of machinery using twisted belts but it is still
considered bad practice. Twisted V belts should be heavily derated and
make sure there is LOTS of space between adjacent pulleys.

Steve W. wrote:
LOTS of equipment out there with twisted belts. Also many with a twisted
idler and two belts when you only have a short distance. In that
situation you use a double sheave pulley and tip it 45 degrees to keep
crossover from occurring.