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GROSS CALORIFIC VALUE OF NATURAL GAS

Objective



Large quantities of natural gas are imported by and traded between the Member States of the Community. The price of the natural gas is related to the energy content. The discrepancies between laboratories can be as large as +/- 0.5 %. Real disputes are not frequent because the contracts specify how differences between their measurements will be handled, but the sum dealt with in such settlements is estimated at several 107 ECU per year, hence the need for improving the accuracy of the measurements. An intercomparison was held to assess if improvement of the measurements could be achieved.

RESULTS

The GCV (Gross Calorific Value) of 2 batches of natural gas was determined by 14 European laboratories using two methods:
- direct calorimetry;
- determination of the gas composition by chromatography and calculation of the GCV.
For calorimetry the spread of results was within +/- 0.15 % (coefficient of variation). The laboratories using the most accurate methodologies agreed within +/- 0.09 %.
For gas chromatography, the spread of results was +/- 0.15 %, for the most accurate results +/- 0.03%. The difference between the mean results of calorimetry and the mean value derived from gas chromatography was 0.01 - 0.02 %.
Final report in print

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

British Gas plc

Participants (13)

Dantest
Denmark
Address

Koebenhavn
Department of Energy
United Kingdom
Address

Wigston
Distrigas
Belgium
Address

Brussels
ENAGAS
Spain
Address

Zaragoza
FEDERAL INSTITUTE FOR MATERIAL RESEARCH AND TESTING
Germany
Address
87,Unter Der Eichen 87
12205 Berlin
Gaz de France (GDF)
France
Address

La Plaine St-denis
Irish Gas Board
Ireland
Address

Cork
Nederlandse Gasunie
Netherlands
Address

Groningen
PHYSIKALISCH-TECHNISCHE BUNDESANSTALT
Germany
Address
Bundesallee 100
Braunschweig
Ruhrgas AG
Germany
Address

Essen
SNAMPROGETTI SPA
Italy
Address
Viale Alcide De Gasperi 16
20097 San Donato Milanese
Thyssengas GmbH
Germany
Address

Duisburg
VEG Gasinstituut
Netherlands
Address

Apeldoorn