ISO 10976:2015
(Main)Refrigerated light hydrocarbon fluids — Measurement of cargoes on board LNG carriers
Refrigerated light hydrocarbon fluids — Measurement of cargoes on board LNG carriers
ISO 10976:2015 establishes all of the steps needed to properly measure and account for the quantities of cargoes on liquefied natural gas (LNG) carriers. This includes, but is not limited to, the measurement of liquid volume, vapour volume, temperature and pressure, and accounting for the total quantity of the cargo on board. This International Standard describes the use of common measurement systems used on board LNG carriers, the aim of which is to improve the general knowledge and processes in the measurement of LNG for all parties concerned. This International Standard provides general requirements for those involved in the LNG trade on ships and onshore.
Hydrocarbures légers réfrigérés — Mesurage des cargaisons à bord des navires méthaniers
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INTERNATIONAL ISO
STANDARD 10976
Second edition
2015-12-15
Refrigerated light hydrocarbon
fluids — Measurement of cargoes on
board LNG carriers
Hydrocarbures légers réfrigérés — Mesurage des cargaisons à bord
des navires méthaniers
Reference number
©
ISO 2015
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ii © ISO 2015 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 5
4 General operating safety precautions and regulatory requirements .6
4.1 General . 6
4.2 Electrical equipment classification . 7
4.3 Electromagnetic disturbance . 7
4.4 Maintenance . 7
4.5 Service conditions . 7
4.6 Compatibility . 7
4.7 Personnel protection . 7
4.8 Procedures . 7
5 Measurement systems and equipment . 8
5.1 General . 8
5.2 Measurement equipment performance . 8
5.3 Calibration and certification of measurement equipment . 9
5.4 Verification of measurement equipment between dry dockings . 9
5.5 Inspection of measurement equipment during transfer operations . 9
5.6 Static measurement systems and equipment.10
5.6.1 General.10
5.6.2 Tank capacity tables .10
5.6.3 Trim and list measurement .12
5.6.4 Tank gassing-up tables or means of determination .12
5.6.5 Tank cool-down tables or means of determination .13
5.6.6 Liquid level measurement equipment .13
5.6.7 Temperature measurement equipment .17
5.6.8 Pressure measurement equipment .18
5.6.9 Custody transfer measurement system.18
5.7 Dynamic measurement systems and equipment .19
6 Measurement procedures .19
6.1 General .19
6.2 Static measurement .20
6.2.1 General.20
6.2.2 Measuring liquid level .21
6.2.3 Loading .21
6.2.4 Discharge .21
6.2.5 Shipboard measurements .21
6.2.6 Liquid level .22
6.2.7 Temperature .23
6.2.8 Pressure .24
6.2.9 CTMS .24
6.2.10 Sampling.24
6.2.11 Vapour return .25
6.3 Gas-up and cool-down quantification .25
6.3.1 General.25
6.3.2 Inerting .25
6.3.3 Gas up and cool down .25
6.4 Dynamic measurement .26
7 Cargo calculations .26
7.1 General .26
7.2 LNG volume determination .26
7.2.1 General.26
7.2.2 Liquid levels below lower measurable limit .27
7.3 LNG density determination .27
Annex A (informative) LNGC design and marine operations.28
Annex B (informative) Additional considerations for measurement on board an LNGC .36
Annex C (informative) Examples of tank capacity tables for a spherical tank .40
Annex D (informative) Calculation examples .46
Annex E (informative) Sampling .55
Annex F (informative) Marine measurement witnessing checklists .59
Bibliography .62
iv © ISO 2015 – All rights reserved
Foreword
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