Storage tank for cryogenic liquid
A storage tank for cryogenic liquid includes an outer tank constructed of a rigid material and an inner tank contained within and spaced inwardly from the outer tank. A supply line supplies cryogenic liquid to a plurality of cryogenic freezers. A fill line having a diameter greater than the supply line allows the storage tank to be filled at a greater speed relative to filling through the supply line and allows the storage tank to be filled while supply cryogenic liquid to the cryogenic freezers. A level sensor processes an impedance to calculate a level of the inner tank and a reporting unit displays the level and may report the level to a remote server.
1. A storage tank for cryogenic liquid comprising:
an outer tank constructed of a rigid material;
an inner tank contained within and spaced inwardly from said outer tank;
a supply line for cryogenic liquid having a first end open exteriorly of the outer tank and a second end open inside the inner tank, the supply line having a first predetermined flow rate at a first predetermined filling pressure;
a fill line for cryogenic liquid having a first end open exteriorly of the outer tank and a second end open inside the inner tank, the fill line having a second predetermined flow rate at said first predetermined filling pressure, said second predetermined flow rate being several times said first predetermined flow rate; and
a level sensor configured to determine a level of cryogenic liquid stored in the inner tank, the level sensor being a capacitance sensor having an inner rod disposed within a sleeve, the sleeve extending within the inner tank, the inner rod and the sleeve being formed of a conductive material, the supply line located within the sleeve of the level sensor.
2. The storage tank as set forth in claim 1 , wherein a diameter of the fill line is twice as large as a diameter of the supply line.
3. The storage tank as set forth in claim 1 , wherein said second end of the second end of the fill line is positioned adjacent a bottom of the inner tank.
4. The storage tank as set forth in claim 1 , further including at least one baffle disposed in the inner tank.
5. The storage tank as set forth in claim 1 , further including at least two baffles disposed in the inner tank.
6. The storage tank as set forth in claim 1 , further including a relief vent configured to release gas generated by cryogenic liquid introduced into the inner tank via the fill line.
7. The storage tank as set forth in claim 6 , wherein the relief vent has a diameter greater than the diameter of the fill line.
8. The storage tank as set forth in claim 1 , further including a reporting unit, the reporting unit in communication with the level sensor and including a display for displaying the level determined by the level sensor.
9. The storage tank as set forth in claim 8 , wherein the reporting unit includes a transmitter configured to transmit the level determined by the level sensor to a remote server.
10. The storage tank as set forth in claim 9 , wherein the transmitter is configured to transmit a wireless signal.