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US 4,228,689 AGranted
Pressure relief manometer
AssigneeThe United States of America as represented by the Secretary of the Army
InventorTetsuyuki Hirata
Life of this patent
Estimating the term…
Abstract
An apparatus for measuring pressure having a reservoir at its base contaig a measuring fluid. Mounted on the reservoir is a uniquely constructed manometer and a side arm with a stopcock to contain fluid spillage when blowouts occur due to gas formations.
Claims4
A pressure relief manometer comprising:
- a container for liquid;
- a liquid mass in said container;
- first generally upright tube means for containing a first column of said liquid responsive to barometric pressure;
- second generally upright tube means substantially parallel to said first tube means, said second tube means containing a second column of said liquid responsive to pressure variations in a test area;
- said first upright tube means extending into said container below the surface of said liquid and terminating at a terminal opening of said first tube means;
- a portion of said second tube means extending into said container concentrically within said first tube means to a location below said liquid,
- said second tube means terminating at a terminal opening below said terminal opening of said first tube means, and
- selectively openable and closeable vent means communicating with the interior of said container for venting gas pressure within said container.
5 more elements
A manometer which comprises:
- a reservoir having a first outlet at a top surface and a second outlet operatively disposed on a side surface;
- a liquid partially filling said reservoir;
- a first tube having a closed top end fixedly positioned in said first outlet and an open bottom end extending into said liquid;
- a second tube of smaller diameter than said first tube having a lower section hermetically sealed to and axially passing through said closed top end of said first tube and extending into said liquid to a depth below said opened bottom end of said first tube;
- a barometric arm having a lower end hermetically connected to same top end of said first tube and communicating therewith and an upper end hermetically connected to an upper section of said second tube;
- a first stop cock valve operatively disposed in said barometric arm intermediate said lower and upper ends of said barometric arm;
- scale means fixedly connected between said second tube and said barometric arm;
- and
- valve means for alternatively evacuating and pressurizing a space above the liquid level of said liquid in said reservoir.
6 more elements
Dependencies are inferred from the claim text.