Search results for query: *

Thanks for that Pat :) The incline tester which MintJulep posted, is there something available like this in the UK do you know? I've tried searching, but cannot really find anything. Thanks

Thanks MintJulep, it is very easy to calculate static μ on the machine really then! Tom, the humidity will be 'about' the same as it is just stored in a dry warehouse. Kenat, I wish I had done that at school, and I wouldn't have to be learning about these things now :) Can I ask, which might...

As in: Fparallel = m • g • sin (XX degrees) = xxN Fperpendicular = m • g • cos (XX degrees) = xxN m = mass of block g = gravity Then that can be applied to Mu = F/N? Thanks a lot

Thanks again Tom. MintJulep, I can see how that works, as in the greater the angle needed, the higher the friction. But how do you calculate the coefficient of friction from it? I presume there must be a formula which includes the angle? Thanks a lot

Hi, We wouldn't require a cert luckily. We just want something in-house to test the packaging, as it should come from the manufacturer with a certain coefficient of friction, but occasionally we have problems with the foil not running through the machine, and you can feel that the foil is a lot...

Thank you for your reply. The food bag would be going over a rippled stainless steel tube, so I guess the test block should be of the same material! Which wouldn't be an issue making it to the same spec. The test would only need to be done dry luckily. The test I described above would be...

Also, another issue I'm not sure about. I've said about pulling a 5Kg metal block across the surface of the foil. Does this have any implications of working out the coefficient? Or would it be better having the metal block with the surface touching the foil actually covered in foil too? I was...

Hi, Do you think it would be practical to DIY a test rig to calculate the coefficient of friction for certain materials? Mainly food packaging. (Foil bags). For example if you clamped the foil material to a flat horizontal surface, sat a weight of 5Kg on top of it (metal block?), and used a...

Thanks for the replies guys. I wish the fan company had really asked more questions, rather than just taking the order, but it is my own fault really from not researching things good enough. berkshire & curtis, I wish I knew this at the time too really. It wouldn't have been an issue fitting a...

Hi, There is still some smoke to be honest! I thought it would improve matters a lot, but it hasn't made too much difference which I don't really understand. I asked the company what pressure drop over the pipe work they had calculated, and they tell me 5Pa per meter? Which is more than 2.2Pa...

I see, thanks zdas04. Another thing I cannot calculate, would be the velocity of the air will be different I presume, as the air will be about 100 Deg C, where as I think the 2.6m/s is calculated at 20 Deg C? Thanks

VPL, thanks for that. Latexman, no unfortunately I'm not an engineer, I'm more of a fitter but need to try to do everything at work to keep us going. I wish I was more knowledgeable with regards this stuff, as I wouldn't have made such an error not specifying a higher pressure rating :(...

Thanks for the reply. Yes, 70Pa does seem very little, but if I remove the filters, the fans should still extract to allow decent working conditions I think.....for the short term anyway! So for Darcy-Weisbach formula, Could you help me fill in the blanks please? f = friction factor = ? L =...

850mm by 250mm not 8500x2500, hehe.

DRWeig, apologies I cannot see how to quote. But the fans are quite large and wouldn't fit in a toilet etc. They are approx 8500mm long and 2500mm wide.

Hi, Thank you for the replies. I've been told the type of filters give the 200Pa back pressure, but I am awaiting feedback from the manufacturer on this, as nothing is proven yet. Hopefully I will get the data sheet on these this week. Each fan does indeed have it's own pipe. Imagine a large...

Hi, I'm hoping someone will be able to help me out, as I'm really struggling to understand an issue at work. We have a fryer with two extract fans which worked fine previously. But as they were very old we decided to overhaul all the ducting and fans, and also they were galv so we couldn't...