Horizontal curve is 300Xpipe diameter

vertical curve is 300Xpipe diameter

central angle less than45-90 deg

inclination is maximum 30% ■

Good morning,

that is what we say too - 300x dia; but for sure it depends on the angle. Metso, a supplier of pipe conveyor belts, says the following:

angle <25° 300...400 x dia

25°< angle <50° 400...500 x dia

50°< angle <75° 500...600 x dia

75°< angle <100° 600...700 x dia

We have also done Pipe Conveyors with smaller Radii than given here. It depends on the exact situation (e.g. Pipe Length, position of the curve - S-curves, ...). But 300x dia should be the very minimum. I remember a Pipe Conveyor dia200 we did with a R=68m-curve and an angle of 80°. In such cases you just should now your belt supplier. Not all are able to make a fitting belt.

regards,

Lukas Paul

KOCH Transporttechnik GmbH ■

Dear ashbhatnagar,

300 to 500 x Dia = Radius is only a rule of thumb. The proper radius has to be calculated and is depending on belt tension at that point, belt modulus, inside elongation vs. outside elongation, buckling of belt as result of a too small radius, additional pretension and some more considerations. ■

From the perspective of a belt manufacturer, if the radius is smaller than the suggested, the belts will tend to experience the following:

1. Ply separation due to elongation and compresion at both side

2. Cracking of the cover rubber due to excessive bending

Over the years, we have seen many pipe conveyor system that did not follow the thumb of rule but suffering from shorter belt life.

The company may have paid lesser for the system design but will have to bear with the cost of belt changeout for a long period of time.

Therefore, my suggestion is to work with a reputable system designer and get the advice of a reputable belt manufacturer for the design of the belt. ■