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vacuum vessel in vehicle

vacuum vessel in vehicle

vacuum vessel in vehicle

(OP)
Hi guys,

Maybe a not very well formulated question from an electrical guy...

we have to make a purchase specification for a system that includes a vacuum vessel for residual water of about 300L, in a vehicule with accelerations about 1,5m/s2.

we have used before similar systems but nobody cared about askig for a simple calculation of the vessel.
- do you think we need one for this application?
- any clue or method about how to assess how much the acceleration transients would affect?
- any standard (EU better) beign applicable to vacuum vessels

thanks!

RE: vacuum vessel in vehicle

$0.02: What is the value for deceleration?

RE: vacuum vessel in vehicle

(OP)
1.5m/s2 for both acceleration and braking, acceleration variations up to 1m/s3

RE: vacuum vessel in vehicle

Your acceleration is much less than weight, so its effect is likely negligible, except possibly at supports. You can design it by adding 15% to the weight of vessel and of content. Note however that the deceleration is surprisingly low: vehicle without brakes?
If the content doesn't fill the inner space, there could be an effect of sloshing, but this too is likely negligible, though it would add to the effect of acceleration.
Codes for vacuum vessels are the same as for pressure vessels: EN 13445 is one.

prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads

RE: vacuum vessel in vehicle

Seems like collision, massive vibration, or the like is more of a threat than acceleration itself.

But, as a vacuum vessel, loss of pressure means the contents suck "in" and not a "blowing up" or explosion, so the difference in pressure (or the threat from a bad design or failure of the tank if you will) is much less than something like a compressed natural gas or liquid H2 "gas bottle.

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