The 6th biennial NGSTech Conference is presented in association with Natural Gas Sampling Technology, Inc., an emerging non-profit industry association dedicated to providing educational opportunities to the energy industry in the science and advancement of hydrocarbon sampling. The NGSTech Conference is an educational and informational forum in which energy industry professionals share the latest in hydrocarbon sampling research, technological developments, processes, and applications. The conference will feature presentations and discussions related to the sampling and analysis of natural gas, gas condensate, liquefied natural gas and petroleum liquids, as well as other important associated topics. Manufacturers of equipment, as well as service specialists will be on hand to exhibit the systems and services that can enable participants to achieve their sampling and analytical objectives. NGSTech is a unique opportunity for energy industry professionals to participate in the world’s first, one-of-a-kind petroleum sampling and technology conference.v
NGSTech Conference LNG Sampling at Low Pressure
Hans-Peter Visser, Analytical Solutions and Products B.V.
A typical LNG mixture start to boil at -260°F (-162°C) at atmospheric pressure. For application like Ship-to-Ship (StS) transfer of LNG typical pressures are below 1 barg. This means that LNG nearly start to boil in the LNG transfer line.
For custody transfer the energy content should be determined with the lowest uncertainty possible. According latest standards like G.I.I.G.N.L. version 5.00 and ISO 8943: 2007, LNG is sampled from the transfer line and vaporized in order to measure the gas mixture by a Gas Chromatograph (GC) or a Calorific Value Determine Device (CVDD). Based on the measurement the calorific value and other properties are determined.
This paper and presentation describe the challenges and solutions to sample and vaporize LNG at low pressures. Extensive tests and experiments have been done. During the tests videos were made, showing the low pressure LNG behaviour at the tip of the probe where the LNG for sampling was taken.
Based on the low pressure LNG observations via a stethoscope, the measuring results could be better explained/interpreted.
NGSTech Conference LNG Sampling location
Houston Marriott Westchase
2900 Briarpark Dr.
Houston, Texas 77042