1、Manual of PetroleumMeasurement StandardsChapter 19.3Evaporative Loss MeasurementPart CWeight Loss Test Method for the Measurement of Rim-Seal Loss Factors for Internal Floating-roof TanksFIRST EDITION, JULY 1998REAFFIRMED, NOVEMBER 2012Manual of PetroleumMeasurement StandardsChapter 19.3Evaporative
2、Loss MeasurementPart CWeight Loss Test Method for the Measurement of Rim-Seal Loss Factors for Internal Floating-roof TanksMeasurement CoordinationFIRST EDITION, JULY 1998REAFFIRMED, NOVEMBER 2012SPECIAL NOTESAPI publications necessarily address problems of a general nature. With respect to partic-u
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14、eum InstituteFOREWORDThis standard provides rules for testing the rim seals of internal oating roofs under lab-oratory conditions to provide evaporative rim-seal loss factors. It was prepared by TaskGroup II of the API Environmental Technical Advisory Group (ETAG).Testing programs conducted by API,
15、which began in the mid-1970s and extendedthrough 1982, provided the information on which the current evaporative rim-seal loss fac-tors are based for common, generic types of external, covered, and internal oating-roofrim seals. These rim-seal loss factors are published in API Publication Chapter 19
16、.2,Evaporative Loss From Floating-Roof Tanks, for use in estimating the evaporative lossof petroleum stocks from external, covered, and internal oating-roof tanks. These rim-seal loss factors and the test methods used to develop them have been widely accepted byoil companies, manufacturers, industry
17、 groups, regulatory agencies, and general interestgroups. API has not, however, tested or developed evaporative rim-seal loss factors forproprietary designs of individual manufacturers. By publishing this test method, API ismaking the test method available to interested parties who wish to test part
18、icular rim sealsunder the auspices of API.API certication of an evaporative loss factor developed through this program is subjectto the following three-step process:(a) The testing shall be performed in laboratories licensed by API. The requirements toqualify for licensure are presented in API Manua
19、l of Petroleum Measurement Stan-dards, Chapter 19.3, Part G, Certied Loss Factor Testing Laboratory Registration;(b) Testing and determination of test results shall be performed as specied herein; and(c) The evaluation of these test results and the certication of an evaporative loss factorfor the it
20、em tested shall then be conducted in accordance with APIManual of Petro-leum Measurement Standards, Chapter 19.3, Part F, Evaporative Loss Factor forStorage Tanks Certication Program.API publications may be used by anyone desiring to do so. Every effort has been made bythe Institute to assure the ac
21、curacy and reliability of the data contained in them; however, theInstitute makes no representation, warranty, or guarantee in connection with this publicationand hereby expressly disclaims any liability or responsibility for loss or damage resultingfrom its use or for the violation of any federal,
22、state, or municipal regulation with which thispublication may conict.Suggested revisions are invited and should be submitted to the Measurement Coordinator,American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005.iiiCONTENTSPage0 INTRODUCTION . . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 NORMATIVE REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . 12.1 API Normative Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2 ASTM Normative Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TERMINOLOGY . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.1 Denitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 Units of Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、 . 23.3 Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 SUMMARY OF TEST METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 SIGNIFICANCE AND USE. . . . . . . . . . . . . . . . . . . . . .
27、. . . . . . . . . . . . . . . . . . . . . . . . 36 LIMITATIONS TO TEST METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.1 Evaluation of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2 Low Loss Rates. . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 TEST APPARATUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47.1 Test Apparatus Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . 47.2 Test Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47.3 Test Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47.4 Data Acquisition
30、 Room. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 TEST ITEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.1 Test Item Construction . . . . . . . . . . . . . . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . 68.2 Test Rim Seal Attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68.3 Test Rim Seal End Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 PREPARATION OF APPARATUS. .
32、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69.1 Test Assembly Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69.2 Test Room Air Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
33、9.3 Data Acquisition Room Air Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . 69.4 Steady State Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610 INSTRUMENTATION AND CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . .
34、. . . . . . 610.1 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610.2 Data Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610.3 Weight Measurement. . . . . . . . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610.4 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010.5 Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010.6
36、 Atmospheric Pressure Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1011 TEST PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1111.1 Rim-Seal Gaps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37、. . . . . . . . . . . . . . . . . . . . 1111.2 Data to be Recorded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12vCONTENTSPage11.3 Duration of Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1212 CAL
38、CULATION OF TEST RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1312.1 Calibration Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1312.2 Rim-Seal Loss Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、. . . . . . . . . . . . . . . . 1312.3 Vapor Pressure Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1312.4 Rim-Seal Loss Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1312.5 Uncertainty Analysis . . . . .
40、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1313 REPORT OF TEST RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1313.1 Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41、. . . . . . . . . . 1313.2 Loss Rate Curve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1314 PRECISION AND BIAS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14APPENDIX A LOSS RATE DETERMINATION . .
42、. . . . . . . . . . . . . . . . . . . . . . . . . . . 17APPENDIX B UNCERTAINTY ANALYSIS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21APPENDIX C METRIC UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27APPENDIX D BIBLIOGRAPHY . . . . .
43、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Figures1 Plan View of a Typical Weight Loss Test Facility . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Elevation View of a Typical Weight Loss Test Facility . . . . . . . . . . . . . . . . . . . . . . 83 Test Asse
44、mbly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Typical Loss Rate Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15A-1 Measured and Calculated Weight Loss Versus Time . . . . . . . .
45、. . . . . . . . . . . . . . . 19A-2 Corrected and Correlated Weight Loss Versus Time . . . . . . . . . . . . . . . . . . . . . . . 20Tables1 Description of the Symbols and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Instrument Requirements . . . . . . . . . . . . .
46、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11A-1 Nomenclature for Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17B-1 Nomenclature for Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21B-2 Sum
47、mary of Example Uncertainty Analysis Results . . . . . . . . . . . . . . . . . . . . . . . 25vi1Chapter 19.3Evaporative Loss MeasurementPART CWEIGHT LOSS TEST METHOD FOR THE MEASUREMENT OF RIM-SEAL LOSS FACTORS FOR INTERNAL FLOATING-ROOF TANKS0 IntroductionThe purpose of this standard is to establis
48、h a uniformmethod for measuring evaporative rim-seal loss factors of rimseals used on internal oating-roof tanks. These rim-seal lossfactors are to be determined in terms of loss rate and seal gaparea for certication purposes.It is not the purpose of this standard to specify proceduresto be used in
49、the design, manufacture, or eld installation ofrim seals. Furthermore, equipment should not be selected foruse solely on the basis of evaporative-loss considerations.Many other factors, such as tank operation, maintenance, andsafety, are important in designing and selecting tank equip-ment for a given application.1 ScopeThis test method may be used to establish evaporative rim-seal loss factors for rim seals used on internal oating-rooftanks. The test method involves measuring the weight loss ofa test assembly over time. This standard species the testapparat
