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[James_student]

Hi all

Im currently on placement and have been given the task of sizing a rubber gas flare hose. I've managed to do the sizing, and had a look at the pressure drop across the hose with which I'm quite happy. However, one of the other guys on placement said I should have a look at the shear stress at the wall to see if the lining can cope. With the media being gas its kinda stumped me, in my head, gas isn't highly viscous so it wouldn't really produce much of a shear stress at the wall?

Am I wrong? Most of the calculations I've looked at seem to be for liquids, I dont seem to be able to find one relating to gas? Is the shear stress caused by gas flow in a pipe deemed negligable?

Any thoughts or help much appreciated!

James