Hello,

Yes; Easy. Satisfy b) every time. If you mention plant reliability/trouble free then it should be the most important. Two lines are more reliable/available than a sinlge leviathan.

Regarding a), the establishment cost will not be much more in the greater scheme of things. You will have 3 walkways instead of 2: but less wind force because the smaller belt should be lower. Simlar lighting should spread across the wider line.etc, etc.

c) is very academic as many forum threads will testify.

It doesn't matter a jot what you saved on capital cost or energy consumption when Plant are blaming Engineering/Projects for downtime loss of production. There cannot be a rule of thumb.

Its definitely twin line if you even have to think about it. ■

Dear Sir

Regarding the use of large pipe diameter.

For 2 x 900 T/hr 2 off diameter 400mm are required.

For 1 x 1800 T/hr 1 off diameter 500mm at a faster speed is required.

There are many 400mm and some 500mm pipe conveyors in existance.

The supply and installation cost for the 2 off is greater.

The power consumption for the 2 off is higher but it does depend if you can sometimes run one only to satisfy the capacity.

Also if you have two and one fails you are obviously able to run at 900 T/hr with the other.

However most customers and suppliers would specify a single unit to do the job as long as it did not put the machine into a difficult or very costly range.

Paul Holt

Dosco Overseas Eng Ltd. ■

DEAR KAYAM

if you want to carry 1800 tph coal

a) economical to set up,

Single stream will be cheaper than dojble stream

conventional belt conveyor will be cheaper than pipe conveyor

b) trouble-free to operate

Conventional belt conveyors conveyors will be more troble free to operate .However dual convyor will be bettr in case of breakdown of one you can operate other

c) energy consuption

Conventional belt conveyor for same straight legth will consume about 20 percent less power.

single conveyor will consume less power than double stream

A R SINGH ■

can you help me?

tell me about the bend radius

what is the function of minimum ben radius ■

Dear NTKHA

Minimum belt radious depends on following factors

1.0Type of Belt Fabric or steel chord

2.0Belt tension at Radious location

3.0Idler spacing

4.0Pipe Diameter

Radiou is selected for case to case basis however

We recommends Minimum radius for the pipe conveyor as follows

:300 times of Pipe Diameter in case of fabric belting for horizontal / vertical curves

600 times of pipe diameter for steel chord belting

400 times of pipe diameter for conveyor having combined horizontal and vertical curves for fabric belting

800 times pipe diameter for steel chord belting

A R SINGH ■