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Cryogenic Oil Flow Meter: Cryo-Hardened Sensors for Special Liquid Gases
Quick Answer: A cryogenic oil flow meter needs cryo-hardened sensors to prevent brittle fracture when measuring liquefied natural gas, liquid nitrogen, ethylene or cold hydrocarbon oils. Silver Automation Instruments supplies Coriolis mass flow meters built with deep cryogenic treatment, measuring mass flow directly from minus 200 degrees Celsius up to plus 60 degrees Celsius. The meter outputs 4-20 mA HART and a pulse signal, and installs into DN15 to DN150 lines without complicated straight runs.
Most engineers skip the sensor material step and lose meters after the first cooldown. Here is the thing: standard 316L stainless steel loses ductility at cryogenic temperatures. A measuring tube that bends beautifully at room temperature can crack when you pump liquid oxygen through it at minus 183 degrees Celsius. We have seen this on customer sites many times. A chemical plant in Saudi Arabia learned it the hard way with a commodity flow meter on a liquid ethylene transfer line. After two weeks the tubes leaked at the weld point.
What Cryo-Hardened Means for Your Measurement
Silver Automation Instruments starts with 316L or Hastelloy C22 measuring tubes and puts them through a controlled cryogenic cycling process. The metal is cooled to liquid nitrogen temperature and slowly brought back to ambient, multiple times. This relieves internal stress and stabilises the grain structure. After that the sensor is calibrated with an actual cryogenic fluid, not just water. Every Silver cryogenic Coriolis meter ships with a traceable calibration certificate at minus 196 degrees Celsius or your nominated operating temperature.
The secondary side gets equal attention. The transmitter housing is cast aluminium with IP67 rating and an ATEX Zone 1 / IECEx option for liquefied gas skids. Internal terminals accept PT100 temperature input directly from the sensor tube. No external temperature transmitter needed. The display shows mass flow in kg per hour, density in grams per cubic centimetre, and temperature simultaneously. You can run the meter with two-phase flow detection enabled. If bubbles appear during cooldown, the meter flags them instead of sending bad readings to your DCS.
In practice, a cryogenic sensor without temperature compensation drifts. One LNG terminal in Malaysia replaced three turbine meters with a single DN50 Silver Coriolis flow meter on a bunkering line. The meter operates at 35 bar and minus 162 degrees Celsius. In two years they have not touched the zero setting. The 4-20 mA signal feeds directly into a custody transfer flow computer, and the plant reports mass balance closure within 0.15 percent month on month.
Typical Applications Where This Meter Fits
LNG truck loading skids and ship bunkering. Liquid nitrogen dosing into food freezers and pharmaceutical reactors. Liquid carbon dioxide injection for pH control in water treatment. Ethylene and propylene transfer at petrochemical terminals in Thailand and Indonesia. Cold heavy oil blending at refineries in the Middle East where oil viscosity drops to 5 cP at minus 30 degrees Celsius. All these applications share low temperature, high value product, and zero tolerance for unmeasured loss.
We also supply these meters to gas cylinder filling plants in Vietnam and Nigeria. A typical setup uses a DN10 or DN15 cryogenic Coriolis meter to fill liquid oxygen dewars. The meter pulses directly to a filling controller. The batch stops within 50 gr
How the Silver Cryogenic Flow Meter Differs from a Standard One
A standard Coriolis meter has O-ring seals rated to maybe minus 40 degrees Celsius. A cryogenic meter uses graphite or PTFE-based cryo-seals rated to minus 250 degrees Celsius. The driver coil and pickoff coils are potted with a low-outgassing compound so no moisture freezes inside the sensor housing. The cable between sensor and transmitter is PTFE insulated and shielded for electrostatic noise. None of these details appear on a generic datasheet.
We also reinforce the process connections. Flanges are forged 316L with cold-rated bolts. Threaded versions use NPT or G-thread with cryogenic sealant. Pipe sizes range from DN10 for lab-scale dosing up to DN150 for high-flow loading arms. Maximum pressure rating is PN100 as standard, with PN160 available for LNG high pressure pumps.
Output Signals and System Integration
Standard outputs from the Silver cryogenic oil flow meter include 4-20 mA HART, active pulse for totalisation, and RS485 Modbus RTU. Most sites take the HART signal into a PLC analog input card and use the pulse output for a remote totaliser on the operator panel. You can set a low flow cut-off in the transmitter menu to ignore vapour pockets during cooldown. The density output helps confirm that the fluid is fully liquefied before starting batch transfer. A density spike means two-phase flow, and the meter can trigger a valve hold.
Pricing and What You Need to Send
We do not list fixed prices because pipe size, pressure class, certification and fluid specifics change the build. Send us your minimum operating temperature in degrees Celsius, your pipe size in DN, your normal and maximum flow rate in kg per hour, and your process pressure in bar. Tell us if you need ATEX Zone 1, IECEx, or just general purpose. We reply with a technical proposal, a specific model code, and a delivery lead time. Most standard cryogenic meters ship within four to five weeks ex works.
Email us at [email protected] or use the quote form at our website. Reference “Cryogenic Coriolis meter” in your subject line.
Frequently Asked Questions
Can this meter measure liquid oxygen or liquid argon?
Yes. The wetted parts are cleaned for oxygen service and certified to O2 clean standards. Material traceability to EN 10204 3.1 is included for all pressure-retaining parts.
What is the smallest flow rate you can measure?
A DN10 sensor measures flow as low as 2 kg per hour on liquefied gas. Turndown ratio reaches 20 to 1 on most sizes. Below that, you would need a low-flow model with narrower tubes.
Does the meter require straight pipe runs?
Coriolis meters are insensitive to flow profile. We recommend 5 pipe diameters upstream and 2 downstream just to avoid mechanical stress, not for flow conditioning.
How do you verify zero in cryogenic service?
You close the downstream block valve, fill the sensor with liquid at operating temperature, vent gas out, and press Zero on the transmitter keypad. The same process takes less than two minutes on a bunkering line.
Is the meter field-repairable?
The sensor itself is a welded assembly and cannot be repaired in the field. The transmitter electronics are modular and can be swapped without breaking the fluid boundary. We hold spare boards in stock in Australia and partner warehouses in Dubai and Singapore.
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