API MPMS 17.6-2014 Manual of Petroleum Measurement Standards Chapter 17.6 Guidelines for Determining the Fullness of Pipelines Between Vessels and Shore Tanks (SECOND EDITION) .pdf

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1、Manual of Petroleum Measurement StandardsChapter 17.6Guidelines for Determining the Fullness of Pipelines Between Vessels and Shore TanksSECOND EDITION, JUNE 2014Special NotesAPI publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, an

2、d federal laws and regulations should be reviewed.Neither API nor any of APIs employees, subcontractors, consultants, committees, or other assignees make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained

3、herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither API nor any of APIs employees, subcontractors, consultants, or other assignees represent that use of this publication would not infringe upo

4、n privately owned rights.Classified areas may vary depending on the location, conditions, equipment, and substances involved in any given situation. Users of this standard should consult with the appropriate authorities having jurisdiction.Users of this standard and instructions should not rely excl

5、usively on the information contained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein.Where applicable, authorities having jurisdiction should be consulted.Work sites and equipment operations may differ. Users

6、 are solely responsible for assessing their specific equipment and premises in determining the appropriateness of applying the standard. At all times users should employ sound business, scientific, engineering, and judgment safety when using this standard.API is not undertaking to meet the duties of

7、 employers, manufacturers, or suppliers to warn and properly train and equip their employees, and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations to comply with authorities having jurisdictionAPI publications may be used by anyone desiring to do

8、so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or

9、damage resulting from its use or for the violation of any authorities having jurisdiction with which this publication may conflict.API publications are published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate

10、the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conforma

11、nce with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard.All rights reserved. No part of this work

12、 may be reproduced, translated, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, NW, Washington, DC 20005.Copyr

13、ight 2014 American Petroleum InstituteForewordNothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the pub

14、lication be construed as insuring anyone against liability for infringement of letters patent.Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform to the specification.Should: As used in a standard, “should” denotes a recommendation or that which is advised but not

15、 required in order to conform to the specification.This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this

16、publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any p

17、art of the material published herein should also be addressed to the director.Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained

18、 from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, DC

19、20005, standardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Significance and Use . . . . . . . . . . . . . . . . . . . . .

21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.2 Considerations for Selec

22、ting a Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Health and Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1 General . . . . .

23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2 Physical Characteristics and Fire Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

24、Terminal Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25、. . . . . . . . . . . . . . . . 36.2 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Vessel Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48.1 General Procedures . . . . . . . . . . . . . . . . . . . . . . .

27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48.2 Procedure for Internal Circulation Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58.3 Procedure for Line Displacement Method . . . . . .

28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.4 Procedures for High-point Bleed-valve Method (or Sight-glass/Mechanical Sight Verification Method) . 78.5 Procedures for Pigging Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . 88.6 Procedure for Line Press Method (or Line Pack Method) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88.7 Line Verification After Cargo Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30、 . . . . . . . . . . . . . . . . . . . . . . . 99 Establishing Agreed Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10vvi1Guidelines for Determining the Fullness of PipelinesBetween Vessels and Shore Tanks1 ScopeThis document describes procedures for determining or confirming the fill condition of pipeline systems used for the transfer of

32、 liquid cargoes before and/or after the liquid is loaded onto or discharged from marine vessels. It includes descriptions of methods and procedures that apply to crude oil and petroleum products. While this document includes descriptions of common line fill verification methods, it does not recommen

33、d any particular method. The responsibility for selecting a method appropriate for a given terminal, and documenting its effectiveness, rests with those responsible for operating the terminal where it is applied.2 Normative ReferencesThe following referenced documents are indispensable for the appli

34、cation of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. API MPMS Chapter 3.1A, Standard Practice for Manual Gauging of Petroleum and Petroleum Products API MPMS Chapter 3.

35、1B, Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank GaugingAPI MPMS Chapter 7, Temperature DeterminationAPI MPMS Chapter 17.2, Measurement of Cargos On Board Tank VesselsAPI MPMS Chapter 17.11, Measurement and Sampling of Cargoes On Board Tank Ves

36、sels Using Closed/Restricted Equipment3 Terms and DefinitionsFor the purposes of this document, the following definitions apply. 3.1agreed toleranceBefore executing the line displacement method, all authorized parties should agree on the amount of difference that will be accepted when comparing meas

37、urements taken before and after the procedure. This agreement may be in terms of volume rather than level measurement. The term agreed tolerance refers to this agreed-upon span of acceptable difference.3.2high-point bleed-valve methodSight-glass/mechanical sight verification methodChecking for the p

38、resence of liquid at high-point valves or sight glasses in the designated pipeline system between the shore tank and the vessel berth. 3.3internal circulation methodTransferring a measured volume of liquid from one shore tank into the same or another shore tank through the pipeline system designated

39、 for the transfer of cargo to or from a marine vessel.2 API MPMS CHAPTER 17.63.4line displacement methodMeasuring the amount of liquid pumped from a shore tank to a vessel (or from a vessel to a shore tank) through the pipeline system designated for cargo transfer and comparing the measured volume d

40、elivered to the measured volume received. TOV is the normal method used. 3.5line press methodline pack methodPressurizing the contents of the designated pipeline system with a liquid to determine if gases are present. 3.6pigging methodDisplacement of the contents of a pipeline system by a tight-fitt

41、ing wiping device propelled through the line by gas or liquid, leaving the line full of the propellant.4 Significance and Use4.1 GeneralWhen custody of petroleum liquids is transferred to or from marine vessels, accuracy in the measurement of quantities transferred is affected by the contents and in

42、tegrity of the shore and vessel pipelines and by shore and vessel tank measurements. Pipelines that contain air or vapor, when assumed to be filled with liquid, require procedures that either eliminate or determine the volume of air or vapor contained in the pipeline. This can be accomplished by one

43、 of the following means.1) Displacing the air or vapor with liquid.2) Displacing the entire line contents.The following methods, listed alphabetically, are recommended for line fill determination. Local limitations, product characteristics, and specific designs may restrict the best selection and us

44、e of a procedure and may affect the accuracy of the procedure selected.a) High-point bleed-valve method (or sight-glass/mechanical sight verification method).b) Internal circulation method.c) Line displacement.NOTE This method can directly affect custody transfer volumes.d) Line press method (or lin

45、e pack method).e) Pigging method.NOTE The high-point bleed-valve method (or sight-glass method), the internal circulation method, and the line displacement method are all intended to fill the designated pipeline system with liquid. The pigging method is intended to entirely displace the contents of

46、the designated pipeline system. The line press method (or line pack method) is intended to assess the fill condition of the designated pipeline system.GUIDELINES FOR DETERMINING THE FULLNESS OF PIPELINES BETWEEN VESSELS AND SHORE TANKS 34.2 Considerations for Selecting a MethodThe following should b

47、e taken into consideration when selecting a method for line verification.a) Methods in 4.1, Items a), b), d), and e) may be performed prior to the vessel arrival. These methods also provide an opportunity to confirm integrity of pipeline condition (e.g. leaking valves) and to take corrective action

48、as necessary without becoming a portion of the custody transfer volumes determination. TOV is the normal method used. b) The design, equipment, and operational capabilities of the vessel and/or terminal.5 Health and Safety Precautions5.1 GeneralDue consideration should be given to applicable safety

49、and health procedures. Considerations should includebut are not limited topotential electrostatic and other fire and explosion hazards; considerations regarding potential personnel exposure (such as exposure limits, hazard communication, training, and associated protective clothing and equipment requirements, and work practices); and potential explosive and toxic hazards associated with a cargo tanks atmosphere. The physical characteristics of the cargo and existing operational conditions should be evaluated, and applicable international, federal, state, and local regulations should

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