Polyethylene versus polyurethane 1

[jmusg]

We are looking at lining baffles in a diverter chute that handles about 150 tph of gypsum rock with either uhmwpe or a polyurethane lining. This area has high abrasion and impact. We are looking at taking energy out of the falling gyp before it lands on a conveyor belt.
Does anyone have any experience with this or recommendations?
Thank you

 

[rnd2]

Generally, uhmwpe for light abrasive particle (sand) sliding and elastomeric materials like pu for light abrasive impact. If the application is not exposed to sunlight natural rubber can rival pu.

 

[macmil]

I would also suggest a combination rubber/ ceramic liner; the rubber takes the impact and the ceramic provides the abrasive wear resistance; more expensive but a one time solution especially for smaller, critical areas. Please cntact me if you want more info / referrals.
mac

 

[jmusg]

Macmil, what have you gone with in the past that has worked for you? Thank you

 

[corrosionman]

If you have space a good way of be ating erosion is to arrange a Dirt Box i.e. the rock falls onto other rock before touching the important surfaces. If the product is dry try a steel bar that is hardfaced by welding or spray deposition of hard alloys but the best of all is as already mentioned - - -
Use 1 inch thick ceramic tiles but affix them by vulcanising them to the steel chassis using a thick SOFT natural rubber posssible hardness 45/50 degree. Hopefully the baffles are removeable. I would discount simply using rubber alone of Pu either . Regards CM

 

[polleke]

Yoy could try profiled rubber of 80 shore and about 150 or 200 mm thick.
They are called: Trellex SP-wearplates
info at:

http://www.metsominerals.com.

Available with steel backplate for welding studbolts on it for mounting and available with a mountingrail vulcanised in the back.
Ceramic tiles vulcanised on rubber and with a steel backplate for mounting can also be used for your pupose.
That is called: Keraflex.
Information at:

http://www.kalenborn.de

Succes
polleke

 

[macmil]

jmusg
criteria are material being conveyed; size amount hardness abrasiveness wet/dry. Gypsum is not too harsh.
Area to be lined ; large / small; is it accessible for reline; critical use ; is there going to be much impact or is it mainly sliding abrasion.
If impact is not a problem, I'd use ceramic tiles; sometimes I have prefabbed them onto a steel plate for quick installation; also good is chrome carbide overlay plate.
If theres a lot of impact then consider rubber ceramic.
In the worst instance ( not yours ) then one of various grades of steel plates are used .
Abrasion Resistant steel plate is frequently used as a standard; it's relatively inexpensive and if the life is ok then thats good.
An advantage of the polyurethane liner in some instances is that in some instances it's better if material builds up; also it's quieter than steel if that's a problem.
A lot of the time it comes down to what's worked in the past and of course cost. Lead time is another factor; if something has to be repaired to day then steel is often the material of choice because of availablity.
Another factor is that for instance in a chute or hopper, the bottom may experience differnt wear than the sides, so you can use different grades / materials/ thickness to keep costs down.
hope this helps
mac