![\"Sampling](\"https://soclema.com/wp-content/uploads/2017/08/schema-echantillonnage-du-gaz-naturel-liquefie-400x253.jpg\")
Sampling liquefied natural gas is a delicate process.
\nFor a sample of Liquefied Natural Gas to be truly representative, it must pass from the liquid state (-161°C) to the gaseous state without partial vaporization or loss of components. To achieve this, it must be maintained in the liquid phase until the precise moment of vaporization. It must then be vaporized uniformly in a single-phase gaseous state.
\nAs shown in the phase diagram opposite, the liquid sample must pass through a liquid/gas biphasic region before reaching its gaseous form. If the LNG sample begins to vaporize in the sampling lines, the nitrogen and methane will vaporize first, producing pockets of gas in the liquid flow to the vaporizer. As a result, the LNG sample reaching the vaporizer will be a non-representative liquid sample rich in heavy components with methane-rich bands.
\nThe gas sample leaving the vaporizer will not be homogeneous, resulting in huge fluctuations in composition. The sample fed to the chromatograph and sampling cylinders will result in a non-representative analysis.
\nAs mentioned in ISO 8943:2007 , precautions must be taken to avoid partial vaporization of the sample in the transfer line and sampling line.
\nPressure, temperature and flow rate in the transfer line and sampling system must be continuously monitored.
\nRegular inspections must be carried out, in particular to check for leaks and defects in the thermal insulation.
\nThe materials of construction of the sampling system must be strong enough to withstand the pressure and temperature conditions to which they are exposed.
\nThe pipe must be installed in a location where the LNG is at a temperature below the boiling point.
\nThe heat exchange capacity of the vaporizer must be sufficient to vaporize all the LNG sampled. It must also be designed in such a way that the heaviest components do not remain inside.
The CryoSamp integrates sampling and vaporization in an all-in-one module, eliminating the need to split the sample between rod and vaporizer.
\nCompliant with ISO 8943 and EN 12838 standards, the CryoSamp is the most accurate solution on the market for providing a representative LNG sample.
\nThe CryoSamp consists of 3 parts: the rod, the cold section and the hot section.
\n![\"soclema_CryoSamp_LNG](\"https://soclema.com/wp-content/uploads/2020/02/soclema_CryoSamp_LNG-Probe-vaporiser-400x390.jpg\")
The rod is not just an insulated rod. It features double-jacketed vacuum insulation, as well as a sub-cooling system that fills the rod with LNG and cools the LNG sample. This keeps the LNG sample at the right temperature, avoiding fractionation or pre-vaporization. In addition, the tube is designed with a self-cleaning in-line tangential filter to protect against particles.
\nThe cold section also features a double vacuum jacket and a sub-cooling system to prevent sample fractionation or pre-vaporization. It is equipped with 2 valves (manual or automatic, as required) and a PT 100 probe to control LNG flow.
\nThe hot section is filled halfway with water. An immersion heater heats it up to 50°C. The water vapor condenses on the coil for maximum heat transfer. The sample passes through the coil, first through the vapor phase of the water and then through the liquid phase, allowing complete vaporization of the sample. A mixing system in the coil optimizes sample integrity.
\nThis sampler is a high-safety product. The PT100 sensor indicates the operating temperature of the vaporizer (50°C) to ensure that the LNG is vaporized. The valve in the cold end protects the system in the event of accidental LNG vaporization.
\nFinally, the CryoSamp is manufactured by a cryogenics specialist and supplied with all the necessary certificates.
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