LNG sampling and return gas offtake LNG in-line sampling: The Operator uses a so-called "in line" discontinuous sampling method, as defined in the LNG European standard EN 12838 and standard ISO 8943 of 2007, that involves: continuously collecting and vaporising the LNG during nominal Cargo Transfer conditions (i.e. not including the start and end of the Transfer operation); collection is performed by means of an isolated Pitot tube (by maintaining it under vacuum conditions or by re-circulating LNG) located in the centre of the transfer pipe, after the transfer arms; the transfer line, which complies with standard ISO 8943, maintains the LNG sub-cooled until it is vaporised in an electric vaporiser, by Joule effect, at regulated temperature; transferring the vaporised gas at stabilised pressure and flow rate to a chromatograph via suitable and identified piping; and carrying out chromatographical analyses at regular intervals (at least three times an hour). LNG cylinder sampling: In parallel with in-line sampling, LNG in the gaseous state is sampled periodically using sampling cylinders. The systems for collecting and transferring the evaporated gas to the sampling cylinders are the same as for in-line sampling. For each Cargo Transfer, three samples (one for the Shipper, one for the Operator and one for an independent laboratory) are sampled simultaneously and in parallel in cylinders when half of Cargo has been transferred, and kept sealed by the Operator for two weeks after the Cargo Transfer ; at the end of this period, the sampling cylinders are purged and inerted. At the express request of the Shipper, and on an exceptional basis, the Operator shall make reasonable efforts to keep the sample cylinders for a longer period. The cylinder samples are only analysed at the Shipper's explicit request and this only applies to the measurement of the main components. If the Cargo Transfer is a Specific Service (gassing up, cooling down) or consists in a specific operation such as the Unloading or the Reloading of a heel of a limited quantity of LNG, there is no LNG cylinder sampling except in case of express request from the Shipper.
LNG sampling and return gas offtake LNG in-line sampling: The Operator uses a so-called "in line" discontinuous sampling method, as defined in the LNG European standard EN 12838 and standard ISO 8943 of 2007, that involves: ▪ continuously collecting and vaporising the LNG during nominal Unloading or Reloading operating conditions (i.e. not including the start and end of Unloading or Reloading); collection is performed by means of an isolated Pitot tube (by maintaining it under vacuum conditions or by re-circulating LNG) located in the centre of the unloading pipe, after the unloading arms; the transfer line, which complies with standard ISO 8943, maintains the LNG sub-cooled until it is vaporised in an electric vaporiser, by Joule effect, at regulated temperature; ▪ transferring the vaporised gas at stabilised pressure and flow rate to a chromatograph via suitable and identified piping; ▪ and carrying out chromatographical analyses at regular intervals (at least three times an hour). LNG cylinder sampling: In parallel with in-line sampling, LNG in the gaseous state may be sampled periodically using sampling cylinders. The systems for collecting and transferring the evaporated gas to the sampling cylinders are the same as for in-line sampling. For each Unloading or Reloading, three samples (one for the Shipper, one for the Operator and one for an independent laboratory) are sampled simultaneously and in parallel in cylinders when half of the Unloading or Reloading has been performed, and kept sealed by the Operator for two weeks after the Unloading or the Reloading. The cylinder samples are only analysed at the Shipper's explicit request and this only applies to the measurement of the main components.
