ISO INTERNATIONAL STANDARD 18132-1 Second edition 2011-08-01 Refrigerated hydrocarbon and non- petroleum based liquefied gaseous fuels General requirements for automatic tank gauges - Part 1: Automatic tank gauges for liquefied natural gas on board marine carriers and floating storage Hydrocarbures réfrigérés et combustibles gazeux liquefiés a base non petroliere Exigences générales pour jauges de réservoir automatiques Partie 1: Jauges de reservoir automatiques pour gaz naturel liquefié a bord des transporteurs de cargaison en mer et des stocks flottants Reference number ISO 18132-1:2011(E) ISO Copyright International Organization for Standardization @ISO 2011 I without license from IHS Not for Resale ISO 18132-1:2011(E) COPYRiGHTPROTECTEDDOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2011 - All rights reserved Not for Resale ISO 18132-1:2011(E) Contents Page Foreword .iv Introduction 1 Scope. 2 Terms, definitions and abbreviated terms. 2.1 Terms and definitions.. 2.2 Abbreviated terms... 3 General safety precautions 2 3.1 Compliance with safety regulations, standards, and classification rules 3.2 Equipment precautions 4 Design requirements .. 4.1 General 4.2 Provisions for routine maintenance and verification 4.3 Provision against sudden malfunctions ... 4.4 Dynamic response.. 4.5 Minimummeasurablelevel.. 4.6 Data filtering and averaging .. 4.7 Compensation for variation of cargo temperatures and/or composition 4.8 Sealing, security and unsealing 4.9 Redundancy.. 4.10 Data communication 5 Installation 5.1 General 5.2 Locationofinstallation. 5 5.3 Protection of tank surface... 5.4 Interference of ATGs in a cargo tank 6 Accuracy 6 6.1 General 6.2 Calibration referenco 6.3 Accuracy requirement. 6.4 Readout resolution 7 Recertification of ATGs 7.1 General.... 7.2 Method of periodic certification.. 7.3 Maximum permissible error. 7.4 Frequency of subsequent calibration and recertification 8 ATGcalibrationrecords. Annex A (normative) Calibration and verification of various ATGs in common use.. 8 Annex B (normative) Calibration and verification of radar-type ATG... ..10 AnnexC(normative)Calibrationandverificationofcapacitance-typeATG .13 Annex D (normative) Calibration and verification of float-type ATG ... ..16 Annex E (informative) Accuracy limitations of LNG level measurement. .20 Annex F (informative) Uncertainty associated with accuracy test of float-type ATG. .21 Bibliography 22 ili ted without license from IHS Not for Resale