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# Full vacume vessel FV4

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## Full vacume vessel FV

(OP)

Hi geants,
please could you explain the fv (full vacume) pressure for vessel?
and wht the inetrnal pressure less than external pressure.?

Regards.

### RE: Full vacume vessel FV

Full Vacuum: Internal Absolute Pressure = 0 psi, external absolute pressure = 15psi.

### RE: Full vacume vessel FV

Process Engineers would say Internal design pressure 0 psia, external pressure assuming above ground at sea level 15 psia.

Why?

Sometimes you can have e.g a vessel full of steam which then cools and condenses to water at a very small fraction of the volume.
Sometimes you can connect your vessel to a pump or compressor which pulls all the contents out of the vessel.

Many times it won't be absolute vacuum, but FV is better than trying to guess what level of sub atmospheric pressure you can rely on.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Full vacume vessel FV

(OP)

Could you provied more examples for good understanding

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