Piping for Transfering Powdered Lime 2

[5wp]

I'm using mild steel to transfer powdered lime from a semi to a silo. The lime needs to be lifted by air some 40 ft high, then on to the silo. In the transition from vertical to horizontal the lime goes thru an elbow. Due to the fact that lime is aggressive on the steel the elbow tends to wear out fairly often. Having 4 silo's is causing a big problem for replacements. Any suggestions as to what type of pipe would stand up better than steel?

 

[dvd]

rubber or a.r. lined flat back elbows

http://www.cecoenviro.com/Parts/AllParts/SectionII/Elbows/elbows.htm

 

[5wp]

dvd
What type of rubber are you suggesting? Sorry but what exactly is an a.r. lined flat back elbow?

 

[dvd]

follow the link, bottom of the page, call Kirk and Blum to ask their opinion based on your conveyed material.

A.R. is abrasion resistant steel, most likely the rubber is high durometer neoprene sheet.

 

[5wp]

dvd
Thanks for the reply. I'll check out K&B.

 

[BillBirch]

I would suggest HDPE which is chemically inert and wear resistant. It is used extensively in the mining industry for slurries where rubber-lined steel pipe had been used previously. You could probably get away with a fairly low wall thickness which will keep the weight down on the supporting silo. The only draw-back is that it must be welded.

By the way, as I recall, softer rubber, i.e low durometer rubber displays better wear resistance than a higher number. The explanation I was given is that the particles tend to "bounce" off the pipe walls.

 

[5wp]

BillBirch
Thanks for the reply, I think that now I'm going in the right direction.

 

[itdepends]

Is it only the elbow that's wearing out?- if so you can install an impact type elbow (our local variation is called a "Botswana" elbow- but that won't help you on google).

Basically the elbow construction includes a dead zone where the solids (lime) is allowed to accumulate- this dead zone is where the fresh lime impacts as it changes direction- thus the dead lime takes the "wear" rather than the metal of the elbow.

 

[europipe]

itdepends, I know what elbows You mean, but I don't think it is a good idea with food.
The foodpowder stays a while in the elbow (decay)

greetings

 

[5wp]

itdepends
Yes the 90 elbow is the only area that wears out. I'm trying to picture this in my mind. What causes the dead zone.? Obbviously something is needed to allow the lime to change direction but not take the energy out of the flow.
Please explain this further. I'm very interested, thanks.
europipe
The product being put into the silo is powdered/pebbeled lime, not a food product.

 

[Compositepro]

Try

http://www.abresist.com/KALFLEX.htm

or

http://www.kalenborn.de/pdf-files/11_Umlenk_D.pdf

or

http://www.pelletroncorp.com/Data/pellbow_articleB.pdf

 

[itdepends]

The kalenborn elbow looks pretty close (at least from the outside) to what we're using for pneumatic conveying of quicklime.