There a only a few manufacturers with ST belt with a breaker in the top cover.

If the belt looks similar to the one in this picture it could be a Sempertrans S.F.B.T. specification.

http://www.afmindustries.com/product...alcordjpg.jpg

I can provide more techical detail of this product if you send me you email to info@afmindustries.com

Best regards,

Andrew Butterworth

AFM Industries

PH 905-443-0150

FX 905-443-0155

info@afmindustries.com ■

There are many belt providers that can reinforce the top cover and/or bottom cover if you include fabrics.

Bando

Bridgestone

Contitech

Dunlop

Goodyear

Scandura

and many more ■

You will have to stipulate a combination of specifications for the purpose viz.

a) EN ISO 15236 & AS 1333 for physical & dimensional features

b) ISO 340 (Clause 4.2.2.2) for Flame resistance properties

c) CAN/CSA/M422/M87 (Type C) for Drum friction & Antistatic properties

etc.

Further, since you are employing a ST 2500 belt in - apparently a cross-country application - you would be better served (technically & financially) with sensor loop protection system rather than a breaker arrangement. The breaker arrangement will work only if the time-amperage overload relay is correctly set and is operative. In my experience it is rarely so and hence such breaker protected belts get only limited mechanical protection rather than electro-mechanical protection, which the breaker was intended to provide.

Should you require further help / clarifications, please let me know at my mail ID.

Regards

Kayem ■

Hi Andrew

I had a look at the picture and info, is that steelcord breaker.?

If so, what's the purpose and advantages over fabric breaker. ■

The cord is a small diameter cord that is wound to be slightly elastic with a stretch of >3%.

This elasticity helps to absorb impact of material. The impact resistance of this belt construction is outstanding. This is a though belt to rip or puncture (but admittedly not impossible).

The elasticity and layout of the cords means that bigger pulleys should not be required.

If material does manage to puncture and object remains (i.e. in the loading bed) the cords can have a cumulative effect due to bunching of adjacent cords before eventually breaking. This means the breaker will fight back and sometimes eject the object or if that is not possible the resistance will often cause the belt to rip to the edge. Ripping the belt transversely is better than ripping endless meters down the middle. It is usually better to put in one splice or even a small saddle than it is to replace a whole belt.

Finally, if there is a belt puncture through the belt these cords are great at preventing rip propagation (rip growth). The hole in the belt will grow only a few millimeters to the next breaker cord and stop. This is important because with traditionally ST belting small reparable holes often go undetected and grow to a major rip before noticed.

I am sure someone can tell me more about fabric breakers for comparison. I would think they have similar advantages but to a lesser efficiency. For example I would not think that a fabric breaker would do as good of job preventing rip propagation. A belt with fabric breaker would propagate slower than one without but still propagate, right?

On another note I would rather have a belt that has outstanding rip resistance to protect against rips than a system that detects them. Sure with a rip detection system the rip is small but you still have a rip. And you have to consider loop sensor maintenance and other problems associated with detectors. Detectors are great tools and have there place but they should not eliminate the exploration of belts with breakers. Better yet you can still put loop sensors in a belt with steel or fabric breakers! You get rip prevention AND rip detection. Its all about budget I guess but at the end of a day a catastrophic failure will cost much more. Not just in the replacement cost of the belt either – unless you are really lucky it will take 10-20 weeks to manufacture a replacement for an overland conveyor! That’s a long time to be without your conveyor – how much with that cost your facility.

Andrew Butterworth

345 Marwood Drive

Oshawa Ontario

Canada L1H 7P8

905-443-0150

www.afmindustries.com ■

What is the width of your ST2500 10Fx5 FR?

This kind of construction is self defined and well understood by any major manufacturer. What kind of FR are you looking for? ISO 340, new EN class A?

Kind Regards

John ■