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thread321-193907 Did an inspection of some bollards yesterday and every bolt was damaged by corrosion to various degrees? I'm thinking of stainless steel bolts for the remeidial spoecification? Has no one else thought of this? Surely not!! I've done an online search without success of...

Just 47, and still asking questions!!! BF

Thanks for the common sense advise. The more sophisticated our analysis and design tools become, the more we tend to ignore rational thought and common sense. I too had some mentors who were driven crazy by my questions. BF

Does the specific gravity of the coal have any effect on the maximum incline angle of the coal conveyor? The coal on our conveyor has an SG of 0.8 to 0.9. Regards Bruce

Thanks for your comment, Ron. I'm specifying 150mm down (max. size) for the demolition concrete, so it would be closer to the 35 degrees, than the 40. On top of the concrete fill, we're planning to stack coal, which will be more like the 50mm down you mentioned. I could probably use 40...

I'm in the process of designing a bulkhead wall to contain recycled concrete rubble. Has any one got any idea of the friction angle of recycled concrete. Intuition indicates 35 degrees. Am I being overconservative? Would appreciate some comment. Thanks Bruce Forbes

Anyone got any data on the friction angle of raw coal. I'm designing a coal bunker wall for a cement works. I'm assuming 35 degrees, conservatively. Maybe 40 degrees?? Would appreciate some comment. Thanks in anticipation Bruce Forbes

I have been approached by a waste process operator that mulchers / shreds green waste up to 100 mm diameter, down to a maximum size of 100 x 20 mm. The mulcher has not been well designed and requires modification to opertae more efficiently. Would appreciate advice or guidance on where I can...

Currently involved in a project where we wish to separate out coarse particles of metal from stormwater runoff. One proposal is to use a 'Hydrodynamic Vortex Separator'. I appreciate the principle of this type of system, however, I have not had any experience with them. Can anyone offer...