Automatic Shut Down LOX Bulk Storage Tank

NASA has a policy of sharing information now and a long history of use of LOX.

Might be something in this to help...

http://www.hq.nasa.gov/office/codeq/doctree/canceled/1740151.pdf

Contact your LOX supplier. They are extremely familiar with the systems for the storage and supply of LOX. In many cases they provide the tanks and maintenance to their customers. They should be the experts for you. If they don't have the personnel for your problem they can definitely put you in contact with the right personnel/supplier/engineers.

If your supplier can not help you or contracts out that type of work, contact a supplier of LOX such as PRAXAIR or AIR PRODUCTS. http://www.praxair.com/gases/buy-liquid-oxygen-or-compressed-oxygen-gas/?tab=supply-options

http://www.airproducts.com/products/Gases/supply-options/bulk-deliveries-and-storage-systems/typical-bulk-liquid-storage-systems.aspx

http://www.uigi.com/

Typical Bulk Liquid Storage Systems

Liquefied oxygen, nitrogen, argon, and carbon dioxide are stored on your site at very low temperature. When gas is required, the liquid is vaporized for supply to your process. For cryogenic applications such as food freezing that require a low-temperature liquid supply, the liquid is delivered from the storage tank to your process by an insulated line.

A typical installation normally consists of a tank, a vaporizer, and controls. Systems are selected based on your volume, desired pressure, purity level, flow rate, and operating pattern.

A typical liquid storage system used for argon, nitrogen, and oxygen.

Tanks
The storage vessels generally used for liquefied argon, nitrogen, and oxygen are 500-, 1,500-, 3,000-, 6,000-, 9,000-, and 11,000-gallon tanks. Liquid hydrogen storage vessels are nominally 1,500-, 4,500-, 9,000-, and 20,000-gallon tanks.

Cutaway of a typical tank.

Ambient Air Vaporizer
While steam and electric vaporizers are occasionally used, the most widely employed vaporizers obtain heat from the surrounding air. These "ambient air" vaporizers are provided in arrays of many-finned tubes to provide vaporization rates up to 40,000 scfh per array. Additional units are added to provide higher vaporization rates.

Control Manifold
Control manifolds are designed to control the pressure to your houseline and to protect that line from excessively cold gas or possible liquid carryover. The manifold consists of a temperature control valve and a pressure control valve. Also included are necessary block-and-bypass valves, as well as a pressure indicator and check valve. There are two basic units-one for rates up to approximately 23,000 scfh and another for rates up to approximately 43,000 scfh.

A typical control manifold.

*Note that the liquid storage system used in your region may be different; please check with your local office.

Years ago we had both a LOX storage tank and a liquid Nitrogen storage tanks. We only did minor repairs to them and called in the supplier to provide other than simple work on them. Cryogenics such as oxygen and nitrogen are not something to be less than perfect with. Nitrogen is an asphyxiant and Oxygen will make things burn at a very rapid rate, almost explosively.

Good Luck, Old Salt