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| Petro Testing Home > Liquified Natural Gas Calibration, Testing and Inspection |
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Global LNG Services |
Liquified Natural Gas Cargo Inspection and Testing, LNG Storage Tank Calibration |
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Intertek provides expert inspection, testing and calibration services for Liquid Natural Gas across the world. Intertek safeguards LNG cargo quality and LNG quantity during the storage, production and transportation stages.
Intertek technical experts provide volume calibration of ship’s cargo tanks and shore-based LNG storage tanks. Accurate measurement determines the financial value of LNG when transferred between ship and shore.
Two different methods of tank calibration are used depending upon the type of LNG cargo tank for the vessel; the Moss type or the Membrane type. Calibration takes one day per cargo tank and is conducted at the shipbuilder’s yard while the ship is in dry dock or in the floating condition prior to delivery.
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Moss type calibration is by laser, and utilises multiple measurements
and volume determination statistics.
Membrane tank calibration is by ISO 8311 Method, referring to the
International Standard ISO 8311 for refrigerated light hydrocarbon
fluids. LNG liquid natural gas tanks are calibrated by physical
measurement using steel tape with strings or a portable handy laser
which has traditionally been applied for many membrane tanks with
approval of government regulatory authorities Korea, Japan, India,
Indonesia, Malaysia, Oman, Qatar and other nations.
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LNG Volume Measurement:
To obtain an accurate LNG volume measurement, the opening and closing measurements are conducted
by an Intertek Caleb Brett Surveyor using the ship’s equipment,
along with the LNG ship’s tank table of cargo tanks, for considering
proper corrections to the LNG ship’s condition.
Sampling LNG:
Generally, a continuous LNG sampling system is
used and sampling is conducted during full rate pumping by an experienced
Intertek LNG Surveyor. The Surveyor takes great care to ensure no air enters into the LNG
sample bottle.
Laboratory Analysis of LNG Samples:
The LNG liquified natural gas samples are analyzed for composition,
purity, sulfur and BTU value at an Intertek Caleb Brett laboratory
by using gas chromatography, often fitted with multi-columns to
separate the components.
To determine composition of the LNG sample gas, a chemist analyzes
the reference standard gas and the sample gas twice, per GPA (Gas
Process Association) protocol. |
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 Contact for more information |
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 Prefer to call us?
Europe +44 1708.680.248
Americas
- Toll Free USA: 1 888 400 0084
- All Others: +01 281 971 5600
Asia Pacific: +65 6515 4510 |
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