Automatic LNG Sampling

The Turn-Key KPS automatic LNG sampling systems are primarily used to determine the BTU’s, SGU and HC Dew point of the gas streams. Furthermore, the KPS automatic LNG sampling systems are used to get information on the status of the produced LNG or the LNG being transferred.

Registration using the KPS automatic LNG sampling systems can be important when there are claims coming from clients, for the control of LNG suppliers, or to prevent unnecessary fiscal payments.

KPS Automatic LNG Sampling Systems are build in accordance with the ISO 8943 / ISO 10715 standards. KPS is capable of providing a truly representative composite sample, giving both the user and his client/supplier confidence.

Brochure on Automatic LNG sampling

The basics of LNG Sampling

Most gas produced today is “wet”, with contaminants and some heavy hydrocarbons that will condense and contaminate the gas stream if incorrectly handled. These contaminants need to be maintained in equilibrium within the sample at all stages of handling so as not to have a detrimental effect on the final analysis.

The KPS LNG sampling systems prevent such downgrading of the sample quality analysis without the need to use multi-stage pressure letdown as used by manual sampling, pressure volume based sampling, gas chromatographs, etc. Furthermore, the KPS LNG sampling systems have minimal calibration requirements and avoid the need for complex field instrumentation to be installed in the field.

Automatic LNG sampling is not just the purchase of the right components; it is the integration of them to form a complete LNG sampling system. To build an automatic LNG sampling system it is necessary to design, engineer and to integrate the components together. This to provide a fully operational LNG sampling system that will be capable of meeting the clients unique application.

The KPS LNG sampling system normally employ three LNG samplers tied into a single process loop to allow three independent but comparable samples to be taken. In addition, provision is made to allow the KPS LNG sampling system to extract fixed volume samples to conventional 500ml receivers at key intervals of the batch. With the KPS LNG sampling system the 3 samples are taken and held in the Constant Pressure Sample Receivers. The use of fixed pressure receivers ensure that the sample is stored at the exact process conditions. Furthermore the receivers have minimal atmospheric or cross batch contamination and a large number of small samples to maximize batch representativity. Each KPS LNG Sampling System can be automated using remote I/O’s and DCS or PLC compatibility. This to monitor the KPS LNG Samplers performance, guard the sampled integrity and schedule maintenance if required.

With LNG sampling systems, the build up is similar to the KPS automatic gas sampling system. For LNG applications the sampling system comprises of a KPS gas sampling system with an integrated vaporisation, stabilisation and control system. This to ensure control of the phase change of the LNG to gas with minimal lag.

References Automatic Gas Sampling / LNG Sampling:

The story of NAM

More on Custody transfers of Natural Gas / LNG
More on Online Gas Composition Analyses
Brochure on Automatic Gas and LNG sampling