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LNG Flow Meter: Cryogenic Custody Transfer Liquefied Natural Gas Mass Tools
Quick Answer: For liquefied natural gas mass tools, LNG custody transfer needs direct mass flow measurement. A cryogenic Coriolis mass flow meter from Silver Automation Instruments handles -196 °C and reports mass flow in kg/h. Send your pipe size in DN, flow range in kg/h, pressure in bar, and temperature in °C for a technical quote.
Why LNG Custody Transfer Needs Mass Measurement
LNG buyers and sellers do not pay for volume alone. They pay for mass or energy content. Volume changes with temperature and pressure. A cryogenic LNG flow meter must measure mass directly at the transfer point.
That is why Coriolis mass flow meters are the standard choice for LNG truck loading, ship bunkering, and pipeline transfer. They give mass flow in kg/h. They also give density in kg/m³. This helps both parties agree on the total delivered mass.
Cryogenic Coriolis Flow Meter Technology for LNG Service
Silver Automation Instruments supplies Coriolis mass flow meters built for LNG service. We use 316L stainless steel sensor tubes for cryogenic temperatures. Signal converters can be remote mounted or compact. The meter is approved for ATEX Zone 1 and IECEx gas environments.
In practice, most engineers choose a DN50 or DN80 meter for truck loading. A small LNG fueling station may need DN25. A large marine bunkering line often uses DN100 or DN150. The meter measures flow rate and totalized mass at the same time.
Not all flow meter suppliers understand cryogenic service. A standard Coriolis meter may work at room temperature but fail at LNG temperature due to gasket contraction and housing stress.
Key Specifications for LNG Mass Flow Tools
Mass flow accuracy is typically ±0.10% to ±0.15% of rate for liquid LNG. Density accuracy is around ±0.5 kg/m³. Process temperature range starts at -196 °C. The output can be 4-20 mA HART, RS485 Modbus, or pulse. A PT100 is built into the sensor for temperature compensation.
LNG density near -162 °C is about 450 kg/m³. The meter reports this value continuously. This data helps the flow computer calculate energy content. LNG viscosity near -162 °C is about 0.13 cP. It does not create a large pressure drop in a Coriolis tube.
We have supplied meters with pressure ratings up to 100 bar. Pipe sizes run from DN15 to DN300. For small pilot plants, a DN15 Coriolis meter works well. For terminal transfer pipelines, DN200 or DN300 is common. Flange connections follow ANSI 150, 300, or 600. DIN PN16, PN40, and PN100 are also available.
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Installation and Calibration on LNG Lines
Install the meter in a low point of the line to keep liquid in the tubes. Keep the pipeline full before startup. Vent and purge the line slowly. Large temperature swings can damage instruments that are not built for cryogenic service.
Most engineers skip the slow cooldown step on small lines. We have seen this on customer sites many times. A meter mounted right after a pressure letdown valve will read unstable values because the liquid flashes to gas. So, if you install the meter near a pressure letdown valve, add a back pressure valve downstream.
We calibrate every LNG flow meter with water at the factory. We also provide a cryogenic service option using liquid nitrogen. That check confirms the meter works near -196 °C before shipping.
Price and Selection Data for Engineers
Silver Automation Instruments is an industrial flow meter manufacturer and supplier. Price for a cryogenic Coriolis LNG flow meter depends on pipe size, flange rating, and certification. A DN25 compact meter for small LNG dispensing costs less than a DN100 remote mounted unit for ship bunkering. Do not guess the flow range.
Send us these four points: pipe size in DN, flow range in kg/h, operating pressure in bar, and temperature in °C. We will recommend a model with the correct wetted material and flange class.
Contact Silver Automation Instruments by Tel: +86-25-68650347 or WhatsApp: +86-25-52155837. WeChat: +86 15365082610. We answer technical quotes within one business day.
FAQ
Can one Coriolis meter measure LNG mass flow and density together?
Yes. A single meter gives mass flow in kg/h, density in kg/m³, and process temperature in °C.
What pipe sizes do you supply for LNG custody transfer?
We supply DN15 to DN300. Common sizes are DN50 for truck loading and DN100 for ship bunkering.
Is the LNG flow meter certified for hazardous areas?
Yes. We offer ATEX Zone 1 and IECEx versions for gas environments.
What signal output works best for custody transfer?
Use 4-20 mA HART for process control and RS485 Modbus for the flow computer. You can run both at the same time.
How do I get a price for an LNG mass flow meter?
Send your pipe size in DN, flow range in kg/h, pressure in bar, and temperature in °C. We will send a technical quote with lead time.