Re: Hopper Lining
Dear Shri Raghavan,
Please indicate the abrasiveness characteristic of the pet coke. This means usual gradation such as A1, A2, A3, A4, etc. or as being mentioned by different practices. In general, pet coke is less abrasive compared to coke, but above information will enable the respondents to provide more reliable replies.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Re: Hopper Lining
Secondly:
What is to be tested hydraulically or pneumatically & for what purpose?
A concrete lining would be the cheapest. Consider that if a steel can be rolled to suit a conical home then it needs more working before it can be really harder than the said home. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Hopper Lining
Dear Sirs,
The coke is stored in a steel silo of 1000 tonnes capacity. Abrasive is cema 6. We are planning a mild steel silo with SS 409 M lining on the conical portion. THe silo is being designed for Mass flow.
Kindly let me know the most economical way / longer life way of lining the silos. If we do proceed with welding of the liners, is it possible to test the whole equipments for welding quality?
regards ■
Re: Hopper Lining
Do you really want mass flow?
If you had a self emptying core flow hopper there would a lot less wear to inside cone surface. And if your material is very abrasive this may actually be an advantage. ■
Re: Hopper Lining
Yes the silo has to be designed as per mass flow. ■
Re: Hopper Lining
Liners are normally intended to be replaceable; that's what they do. If you are going to weld liners in place then you might just as well make the shell thicker from day 1 & weld patches over the holes as they appear, really.
Weld quality is a major topic of engineering science. If you are not aware of weld specifications or procedures you should leave such matters to welding experts. Perhaps those charged with the design of a Mass Flow Bin might know something about welding! ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Hopper Lining
Originally posted by raghavan1973
Yes the silo has to be designed as per mass flow.
Why?
(Just curious) ■
Re: Hopper Lining
Lining could be done with either ceramic, or special wear plates. Wear plates would be easier to install (ie..plug weld) and would give you a good service life, especially over the stainless.
Ceramics are a little more time intensive to install, but the lasting effect usually outweighs any other material. I have ash re-injection nozzels that were ceramic lined looking like new after 9 years in service. ■
Re: Hopper Lining
Now some wood is showing through the trees. If you persist in welding the liners in place it seems you are then concerned with supplying weep holes to test the weld quality; which is where the hydraulic/pneumatic crap started from. Air is your only option because if you are looking for bubbles between encroaching liners you are stuffed. So you will need a couple of tappings for the airline & gauge. So: your liner must be thicker than the length of the nipples. It's a good place to start from if you don't know where you want to get to!
Like they say "If there's a hard way to do a job ..... will find it!" ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Hopper Lining
Hi,
For a silo to be used for pet coke, please suggest best materila for lining. Lining is being done only on the cone portion. THe silo is designed for mass flow. Can we go for a cladded steel for the conical portion ?
How do you test the equipment ( hydro or pneumatic ) ?
thanks for your info
raghavan ■