Questions You Should Know about micro cryogenic liquid storage tank

Before Use

Q. How does a differential pressure (dp) gauge measure level in a cryogenic tank?

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A. A differential pressure (dp) gauge has two ports, a high pressure port and a low pressure port. On a cryogenic tank the high pressure port of the gauge is piped to the bottom of the tank. Since the tank is pressurized the low pressure port of the gauge is piped to the top of the tank, the vapor space. The difference between the high and the low pressures then represent the height of the liquid only. On Orange level gauges, differential pressure is relayed to the gauge through a magnetically coupled sensor-indicator design.

Q. How do you calculate the range required for a dp level gauge on a cryogenic tank?

A. Cryogenic tanks have an inner and an outer tank. Multiply the height of the inner tank by the specific gravity of the liquid. Then multiply by .90 to account for the top 10% of the tank occupied by the ullage or vapor space. This 10% is typical, not a standard factor. The calculation becomes, Height (inches) x SG x .90 = XX inches H2O. For more detail on this or for assistance in calculating the level range for your tank contact Orange.

Q. What size tanks can Orange Research gauges and transmitters be used on?

A. Orange has level gauges or transmitters for all size tanks, including liquid cylinders, micro-bulk tanks, bulk tanks, ISO tanks and trailers. For more details on matching your tank to an Orange solution please contact us.

Q. What gases can Orange level gauges be applied to?

A. LIN, LOX, LAR, CO2, LNG. For information about matching your gas to an Orange level gauge please contact us.

Q. How do I specify an Orange level instrument?

A. Each product page has a How To Order section which steps you through the features required to complete a configuration of your gauge. You can contact Orange directly for assistance.

Q. What units are available for your scales?

A. Most common scales are in InchesH2O, but psid, bar, kPa, gallons, liters, % and many others are standard.

Q. Do you have level transmitters for Telemetry?

A. Yes, Orange has dp level transmitters that are commonly integrated into Telemetry systems. They are a standard option for adding to a gauge, or as a transmitter only, with no gauge. The outputs are 4-20mA (2-wire) or 0-5Volts. The outputs of our wired transmitters are fed to the telemetry systems. To discuss integrating our level transmitters into your telemetry system contact us directly.

Q. Can Orange level gauges handle the cold temperatures of cryogenic liquids?

A. The liquid in a cryogenic tank is boiled off to a gas by the time it reaches our gauges, so the temperatures are quite warm relative to the liquid phase during storage. So, there is no problem with the cold temperatures actually coming into contact with our level instruments.

Before Use

Q. Can Orange level gauges or transmitters be used in cold outdoor environments?

A. Yes, Orange level products are able to handle the coldest temperatures in the coldest environments. They have been used successfully above the Arctic circle, for decades, with no reported problems.

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Q. Can Orange level gauges withstand the shock and vibration common on transported tanks or trailers?

A. Yes, in fact the Orange level gauge design is uniquely qualified for such use. We incorporate a magnetically coupled sensor-indicator design, which allows for frictionless movement, so there are no mechanical linkages to wear or break. This means no recalibration or repairs are necessary, resulting in care-free operation for many years.

Q. What types of valves are recommended for a dp level gauge?

A. One isolation valve for the high pressure port, and one isolation valve for the low pressure port, and an equalizer valve are recommended. A three way manifold valve incorporating all three is common. Orange has a level gauge solution with an integral 3 way valve.

Note: The valves should always be opened and closed slowly. Although Orange level gauges are rugged and reliable, they are still sensitive instruments.

Q. Does Orange Research have level gauges that replace Barton or Prime level gauges?

A. Yes, Orange level gauges have been replacing Barton and Prime gauges for many, many years. On some models we can actually match the mounting hole and porting patterns on the Barton gauges exactly. Contact Orange for more details.

During Use

Q. Why does the level reading on the tank read below full when my tank is newly filled?

A. During filling, a cryogenic tank often experiences higher than normal operating pressures. This higher pressure can lower the specific gravity of the liquid, which lowers the pressure on the high pressure port of our instrument, which in turn lowers the level reading. For more details on this please contact Orange.

Q. Why does my level reading fluctuate over time with no usage?

A. When the ambient temperature changes upwards this change is also slowly transferred into the cryogenic tank. This higher temperature raises the tank pressure, which in turn decreases the SG of the liquid and lowers the level reading. downward the reverse occurs. To better understand the effects of pressure and temperature variations on your tank level reading please  .

Cryogenic tanks are typically filled from the top using the blow down method. The blow down method is when the pressure of the tank is reduced by blowing out the head pressure of the tank in order to fill it. Blowing down a tank wastes product and in turn costs money. Top filling also requires taking the tank offline or to not be used while it is being filled because the tank cant keep pressure, which causes the customer using the tank to shut down and stop their operation during filling. However, the Arctic Fox tank enables the user to simultaneously fill from the top and bottom, eliminating the need to use the less efficient blow down method. The bottom fill method keeps the pressure up, allowing the user to keep the machine online and keeping their operation running since the Arctic Fox maintains the required pump pressure to keep operating. The top and bottom filling method does not require a tank to be blown down and therefore prevents loss of product during the filling process.

For customers such as laser cutting facilities that use nitrogen gas in their machines to cut metal products, the Arctic Fox tank is invaluable as it permits operations and production to flow smoothly throughout the entire filling process. Because the top and bottom fill capability maintains the necessary pressure levels during the filling process, the user can continue production without halting the use of the gas. This ensures a seamless filling period for the customer unlike the process required by other tanks that rely on the top fill method.

Additionally, the Arctic Fox tank features different hookup options. This flexibility allows multiple types of trucks to connect to fill the tank, including conventional micro bulk-trucks with a standard cryogenic hose and those with an inch and a half bulk hose. This way, users aren't limited in what kind of trucks they can use to fill their tanks.

Throughout the entire process, the operator has complete control over the pump pressure of the Arctic Fox tank. With top and bottom filling capability, filling is much faster than any other method. And users can complete rapid tank fills without the use of specialized proprietary pumping equipment. The arctic fox tank was designed for filling to be a seamless and efficient process.

With the Ratermann Manufacturing Arctic Fox Tank you will be able to maximize both production and efficiency while minimizing costs to your customer's company. The Arctic Fox tank's top and bottom fill feature and duel blow down vents ushers in a smarter, faster & overall more efficient way to fill tanks allowing companies to fill tanks faster and make more deliveries per day. (For PDF of this article click here)

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