What is exploding -

a dust?

a gas?

a vapour?

What is the wall in -

a building?

a vessel?

part of a machine?

Help yourself,

spend a bit of money,

buy a copy of "NFPA 68: Standard on Explosion Protection by Deflagration Venting" as a start point.

Don't know where to buy it? just Google for it! ■

Hi Naushad,

When all else fails - use the phone.

I find it a lot easier to get on the phone and talk to a real flesh-and-blood person, rather than waiting for volunteer information on the internet.

Explosion venting has been around for quite some time - as you can see from the quoted literature. Often the leading European vent manufacturers will have catalogues which give you selection information. Your technical representative can help. If you don't have one nearby, then your company will pay for a long-distance call to a Vendor in Europe or USA [tell the accountants not to be so stingy with their petty cash accounts. An explosion can cause a lot of consequential damage].

Another source is the Fire Prevention department. They often have specialists who can help you.

But if you want to do a study on explosions you are getting into another field. You are looking at the micro effect of thermal shock waves in a gas, and dynamic overpressures. Some basic modelling techniques are available for one-dimensional shock waves in a tube. Two dimensional modelling can get very complicated, because you are not only interested in the original shock front, but the effect it has when it reflects off the walls, and combines with the other pressure effects. Frustratingly complicated stuff if you want sensible answers. Much of the research comes from the military. Last time I had to do that was in South Africa when we were designing laboratories for weapons development.

Regards - Sgt John.Rz

http://au.groups.yahoo.com/group/bionicresearch ■

Number of posts, 1

Date of post, 3/7/07

Date now, 30/8/07

Think he's lost interest (as have I)! ■

You might have mate,

But every post gets other hits. There are young kids all around us listening and taking in stuff you have no incling off. We should leave them a few pointers now and again. ■

Download registration doesn't seem to work??? ■

What extension??? ■

Maybe a couple more pages in English would help. Bable fish is OK but not ideal. ■

Hi designer,

Standard computer language - a dot-file extension. It is used to modify your email address, by adding a (.) and an identifying code name. Then the address can be legally on-sold to others who can then delete the extension and send you a bunch of spam.

[It's kindergarten stuff if you're a computer geek].

Regards - John.Rz

www.cospire.com / Engineering Tips ■

I think the problem was that I used a hotmail account (as I frequently do for such things) ■