Dear Mr. Hong,

The maximum inclination up-ward is 28 Deg. & that of in decline condition max. is 10 Deg.

Regards.

A.Banerjee ■

Where doe this 10 degree down slope criteria come from?

Is it product size and shape dependent? I do not see any product features in the posting request.

Why would incline and declines be markedly different (28 vs 10 deg.) outside of braking dynamics and the subtle disturbance of reshaping the crossectional charge through each idler station? ■

Without knowing more details, it seems that your tube size is unusually large. A typical pipe would more likely be about 450mm diameter with your product.

You may be able to design for a +30 degree slope, depending on the many design considerations.

Since you are not a pipe conveyor engineer, what are you trying to accomplish? ■

Dear Mr. Nordell,

What should be maximum declination of pipe conveyor to be used considering the above stated case.

Regards.

A.Banerjee ■

Dear Sirs

Regarding maximum inclines.

There are several pipe conveyors over 30 deg up to 40 deg uphill and downhill can be around 15 deg.

But it depends very much on the material type, its adhesion qualities, shape etc.

The main problem with the downhill is the conveyor stopping and causing a cascade, pressurising a bulge or burst in the pipe.

Paul Holt

Dosco Overseas Eng Ltd. ■

Back in the mid 1970's I got my own house and so travelled a different route to work. Every day I passed a derilict factory and through the missing end wall could see a "pipe" conveyor. Except that this wasn't a conveyor but a "Z" shaped elevator. The intake was on the horizontal open section which was then folded into a tube by roller sets as it went through the transition to the vertical. I don't know what it handled, but the site was once a flock mill so maybe that's what it handled.

I always meant to stop and take some photo's but never got around to it and then one day the site was bulldozed flat! I always regret never taking the photo's . Anyway, this "pipe" conveyor went vertical! ■

Dear Sir

A true 'Pipe Conveyor' i.e. a rubber belt which after loading the material and over a transition length forms the belt into a pipe shape and maintained by sets of idler at panel spacings will not got up vertical.

It is like a convetional rubber belt and has its limits but will go steeper than conventional belts due to added friction and containment.

The 'pipe conveyor' developed by The Japan Pipe Conveyor company now owned by Bridgestone was developed in the late 1970's.

I don't know what you saw but it was not this it was something different as the pipe conveyor generally refered to in this Forum.

Also machines like the HAC will go vertical. ■

Originally Posted by Paul Holt

Dear Sir

A true 'Pipe Conveyor' i.e. a rubber belt which after loading the material and over a transition length forms the belt into a pipe shape and maintained by sets of idler at panel spacings will not got up vertical.

It is like a convetional rubber belt and has its limits but will go steeper than conventional belts due to added friction and containment.

The 'pipe conveyor' developed by The Japan Pipe Conveyor company now owned by Bridgestone was developed in the late 1970's.

I don't know what you saw but it was not this it was something different as the pipe conveyor generally refered to in this Forum.

Also machines like the HAC will go vertical.

1) it used a smooth flat belt

2) it used idler roller sets to wrap the flat belt into a "tube" or "pipe" in the conveying section

That's EXACTLY your description, so it's a pipe conveyor .

Maybe yours won't go vertical, but this one did and since I saw it in the early to mid 1970's, pre-dates the late 1970's, but hey, who's worrying as whoever made it is long since gone. Probably only went vertical because of the material it handled and no expert told the manufacturer that they shouldn't take it vertical.

As I said, it's to my eternal regret that I didn't take the camera one day and stop on the way back from work and photograph it. You just have to take my word for it that I saw what I have described (or not if you're that way inclined). ■