LNG vaporizing, sampling, and analytical products

Keep your LNG under control with ASaP’s LNG vaporizing, sampling, and analytical products with a wide variety of options and certifications

Time is money! Every hour an LNG carrier can sail away earlier from a FSRU will have a significant positive financial impact. So it is important that a FSRU can always operate at its maximum flow rate to minimize transfer time. Consequently the liquefied gas sampling pressure at the cross-over manifold at the FSRU‘s will be at its minimum. In practice it can be lower than 1 barg.

The sampling of the Liquefied Natural Gas for custody transfer is done by means of an analytical vaporizer connected to a sample container and on-line analyzer. The location of the sampling point(s) is at the cross-over manifold. Nearly all analytical sampling systems until now operated at pressures above 2,5 barg.

The Catch-22 is: lose money on waiting time of the carrier (increase the pressure by squeezing flow), or lose money on inaccurate LNG analysis?

The Phazer, is a combined probe/vaporizer, for direct mounting on the transfer line. The Phazer operates at any LNG pressure and vaporized samples allowing analysis with the lowest uncertainty.

Our Probe-Vaporizer has proven its outstanding performance at LNG pressures of 0,5 barg at tests and during ship-to-ship transfers. The total measurement (vaporizer, LNG sampling system and analyzer) standard deviation during the ship-to-ship was just 0,0019 MJ/Nm3!

The ASaP LNG Probe-Vaporizer conforms to ISO 8943 and is tested against EN 12838. Your LNG measurement is only as accurate as your provided sample…

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ASaP practical solutions

The practical solutions of ASaP are based on on decades of experience, specific education, knowledge of the team members and, last but not least, the joy in our work. The well-established and complementary ASaP package of services and products is an important contribution to the right solutions for your analytical needs. Moreover, the team spirit and the cooperation with specific partners give us the opportunity to design, build, locally install and commission tailor made analyzer systems for you. All these products and systems can be carried out according to the latest guidelines, such as ATEX.

ASaP is a reputable provider of analytical solutions; We can provide you with a full service package including analyzers, system integration etc. You are kindly invited to consult us on any analytical challenge! The Phazer is manufactured by ASaP, an ISO 9001:2015 certified company in the Netherlands.

Normec ASaP ISO 9001 2015
ASaP’s Quality Management Systems are audited according to the most recent guidelines of the NEN-EN-ISO 9001:2015 standard.
ASaP is VCA certified

LNG test unit – The 3rd generation design from ASaP

ASaP is actively participating in (re)writing LNG and other International Standards. Therefore the need for testing is well embedded in the ASaP organization.

ASaP LNG Test Unit with Phazer LNG probe-vaporizer
LNG test unit – The 3rd generation from ASaP

For the Dutch metrology institute, VSL, ASaP designed, built and tested the first and only commercially available test unit according to EN 12838: 2000. For internal tests ASaP has designed and built 2 generations of test units.

With new market developments emerging, like optical in situ measurements based on Raman and Infrared spectroscopy, ASaP designed a new LNG test unit. ASaP’s 3rd generation test unit is able to test two identical or different LNG devices simultaneously to determine both their uncertainty as well as the differences between two devices and/or analytical methods under identical, controlled and simulated process conditions..

LNG test unit - The 3rd generation from ASaP results

An accurate undertaking

Nearly all LNG deliveries are subject to custody transfer where the LNG cargo is traded from one operator to another operator.

Once custody transfer comes into place, contracts are involved. In sales and purchase agreements (SPA’s), the determination of the cargo value will be described and defined.  As per current international standards, the value of the Liquefied Natural Gas is based on the amount of energy or BTU’s delivered.

Depending on the size of an carrier, LNG is transported in batches from approximately 4000 m3 up to 266.000 m3. Contingent on region, type of contract, etc., these volumes may represent a monetary value between approximately US $200 000 and US $13 million at the current all-ti me low price. However, in April 2012, at the all-time  high, a cargo of 266 000 m3 of LNG was representing a monetary value of nearly US $125 million.

It is evident that the enormous financial value per cargo requires an extremely accurate determination of the energy quantity as delivered.

The challenges of accurate LNG measurements

Many technical articles and lectures have already been delivered on the important subject of the challenges of accurate LNG measurements, and in a nutshell it comes down to the following details.

The natural gas which is processed prior to liquefaction consists mainly of methane. Depending on the source of the explored natural gas, the heavier hydrocarbons, such as ethane, propane, butane, pentane, and even hexane, may vary in their composition. Often some nitrogen is present as well. During processing and liquefaction, Liquefied Natural Gas is produced as a liquid hydrocarbon mixture with a typical boiling point of-162°( or -260°F at atmospheric conditions. During (un)loading and custody transfer of the LNG, the energy content and density of the  LNG must be almost constantly sampled to dedicated cylinders and continuously measured as per most common SPAs. The composition of the LNG is typically measured by an online gas chromatograph (GC); derived from the composition of the physical properties, calorific value (BTU value), density y, etc. of the gamified LNG are determined. In general, an online GC gives a measurement update between 3 – 15 min.

The most crucial and critical part of the measurement is the sampling. Specifically, at the point the Liquefied Natural Gas sample is taken from the LNG transfer line and transported to an analytical vaporizer. In the vaporizer the LNG must be converted into a stable and homogeneous hydrocarbon gas mixture, which represents the LNG at the time it passes in the transfer line. The process of sample taking and vaporization of LNG is continuous and instantaneous.

Often the correct measures are not taken when transporting the Liquefied Natural Gas to the evaporator. Due to the large temperature difference between the LNG and the ambient temperature, the LNG tends to start boiling uncontrollably before it reaches the vaporizer……

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