3D pipe runs in CAD

Don't forget that the maximum pressure differential between a vacuum and atmospheric pressure is less than 15psi and slightly more than 1 bar. Compare this to compressed air at maybe 75psi, steam at 200psi or hydraulics at 3000psi and you should appreciate that holding a vacuum is not an arduous task for most fittings.

Martin C

If extruding or sweeping a line Instead of abrupt 90 degree changes in the line try filleting the bend first, then extruding the pipe form over that. In real life pipework there is always a radius, the canter point is normally outside the pipe itself in free space. This will give a more natural form of bend.

Logically yes, practically it depends on how much vacuum you actually need to maintain and for how long.

Holding ultra-high or absolute vacuum requires a near perfect/actually perfect seal at a molecular level, which is more challenging than maintaining "good enough" sealing performance in the containment of steam/oil/compressed gasses.

Jelly states the problem well - even a tiny leak will destroy a vacuum, my container is only 2.3 litres of nothing, and an Oxygen molecule will get through a gap of about 1 billionth of a millimetre.

The vacuum is part of a pendulum clock, from which I hope to get high-performance. Pendulum accuracy is affected by air churning as the bob swings, and by changing air-pressure altering its buoyancy. Humidity can cause trouble too. So, it's desirable to pump out as much air as possible and to keep it out for several years.

Back to pipe routing, after much thought this arrangement is possible, so simple there's no need to route the pipe:

Only issue is the need for a 6mm diameter hole to be drilled 100mm  deep into the block. Straight, because wandering just a few millimetres left breaks out. Don't like it.

Dave

Edited By SillyOldDuffer on 02/05/2023 18:10:35

Dave.

Is the plastic pipe up to the job of not collapsing in on itself under high vacuum?

Martin.

Dave says he is using copper pipe.

I thought he was using plastic soil pipe for the enclosure.

Martin.

I thought you were talking about what he is plumbing it with as thread is about pipe runs