LNG unloading metering issues
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LNG before unloading. Generally, it is measured using a scale; after unloading, it is weighed again to determine the amount unloaded. Is there any simpler way to measure the amount unloaded? Can a mass flow meter be used?
Mass flow meters need to be inspected every six months, and this inspection must be carried out at a quality control facility; if one wants to conduct the inspection on-site, they need to purchase the necessary testing equipment. If such capabilities are available, then mass flow meters can be used for measurement purposes.
A mass flow meter can be used as equipment for delivery once it has an inspection report issued by a local metrology and quality inspection agency; however, to avoid losses, it is better to ensure that the tank inspection is thorough
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The company I work for uses mass flow meters to measure butadiene; its properties are similar to those of LNG, and the accuracy is quite good. A mass flow meter for LNG should work as well, right?
Mass flow meters are completely viable, but their operating costs are high. Most factories still use scales. What do you mean by a simple method – isn’t just weighing enough of a simple approach?
Butadiene and LNG are very different; in liquid form, LNG is at -160 degrees Celsius
Typical LNG plants do not use mass flow meters for trade settlement measurements, mainly because LNG is prone to vaporization; when a two-phase flow occurs, the readings provided by the flow meters become highly inaccurate. As a result, in many LNG plants, the flow meter readings are used only as a reference, with load cells being the primary measurement tool, and the receiving parties also accept settlement based on load cell readings.