Pressure Thrust into a larger chamber..
Pressure Thrust into a larger chamber..
(OP)
Hi,
If I have a pipe connecting to a 750mm diameter vacuum chamber via an unrestrained 500 mm diameter bellows, can someone confirm that the thrust pressure that would work to collapse the bellows under vacuum would be based on the diameter of the bellows and not the chamber?
I am pretty sure that it is but this keeps nagging at me. The pressure, as I work it out, should lift about 2 tonne.
Thanks..
If I have a pipe connecting to a 750mm diameter vacuum chamber via an unrestrained 500 mm diameter bellows, can someone confirm that the thrust pressure that would work to collapse the bellows under vacuum would be based on the diameter of the bellows and not the chamber?
I am pretty sure that it is but this keeps nagging at me. The pressure, as I work it out, should lift about 2 tonne.
Thanks..
Simmantix
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Phases of a Project:
Exultation, Disenchantment, Search for the Guilty, Punishment of the Innocent, Praise for the Uninvolved...





RE: Pressure Thrust into a larger chamber..
Simmantix
---------
Phases of a Project:
Exultation, Disenchantment, Search for the Guilty, Punishment of the Innocent, Praise for the Uninvolved...
RE: Pressure Thrust into a larger chamber..
Independent events are seldomly independent.
RE: Pressure Thrust into a larger chamber..
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pressure Thrust into a larger chamber..
Awful drawing attached..
Simmantix
---------
Phases of a Project:
Exultation, Disenchantment, Search for the Guilty, Punishment of the Innocent, Praise for the Uninvolved...
RE: Pressure Thrust into a larger chamber..
The bellows does not need tie rods or other funny business, >>>>once installed<<<<, because a bellows under external pressure is stable.
The bellows may be shipped with some sort of tie rods or straps to limit the amount of damage that can be done to it during shipping and handling. Any such restraints should not be removed until the bellows is secured in place between the pipe and the chamber.
If you anticipate pressurizing the inside of the bellows at any time, e.g. for cleaning, or some conjectural process, or just by filling everything with water, or whatever, you should consult with the bellows manufacturer about what sort of restraints, if any, will be required to deal with that nonoperating internal pressurization.
Mike Halloran
Pembroke Pines, FL, USA
RE: Pressure Thrust into a larger chamber..
Simmantix
---------
Phases of a Project:
Exultation, Disenchantment, Search for the Guilty, Punishment of the Innocent, Praise for the Uninvolved...
RE: Pressure Thrust into a larger chamber..
It should not be installed that way; both ends should be fixed to the greatest extent possible. The bellows is there to compensate for the extent to which its ends cannot remain absolutely fixed.
You can use a bellows in a way where one end translates, for example as an aneroid. Its life will be severely limited in that situation.
Mike Halloran
Pembroke Pines, FL, USA