_API_MPMS_19.3B-1997_2002.pdf

FOREWORDThis standard provides rules for testing the rim seals of external,covered,and internalfoating roofs under laboratory conditions to provide evaporative rim-seal loss factors.Itwas prepared by Task Group II of the API Environmental Technical Advisory Group(ETAG).Testing programs conducted by API,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 floating-roofrim seals.These rim-seal loss factors are published in API Publication 2517,EvaporativeLoss From External Floating-Roof Tanks,API Publication 2519,Evaporation Loss FromInternal Floating-Roof Tanks,and in API Manual of Petroleum Measurement Standards,Chapter 19.2,Evaporative Loss From Floating-Roof Tanks,for use in estimating theevaporative loss of petroleum stocks from external,covered,and internal floating-rooftanks.These rim-seal loss factors and the test methods used to develop them have beenwidely accepted by oil companies,manufacturers,industry groups,regulatory agencies,and general interest groups.API has not,however,tested or developed evaporative rim-seal loss factors for proprietary designs of individual manufacturers.By publishing thistest method,API is making the test method available to interested parties who wish to testparticular rim seals under the auspices of API.API certification 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 Manual of Petroleum Measurement Stan-dards,Chapter 19.3,Part G,Certified Loss Factor Testing Laboratory Registration;(b)Testing and determination of test results shall be performed as specified herein;and(c)The evaluation of these test results and the certification of an evaporative loss factorfor the item tested shall then be conducted in accordance with API Manual of Petro-leum Measurement Standards,Chapter 19.3,Part F,Evaporative Loss Factor forStorage Tanks Certification Program.API publications may be used by anyone desiring to do so.Every effort has been madeby the Institute to assure the accuracy and reliability of the data contained in them;how-ever,the Institute makes no representation,warranty,or guarantee in connection with thispublication and hereby expressly disclaims any liability or responsibility for loss or dam-age resulting from its use or for the violation of any federal,state,or municipal regulationwith which this publication may conflict.Suggested revisions are invited and should be submitted to Measurement Coordination,American Petroleum Institute,1220 L Street,N.W.,Washington,D.C.20005.必No reproduction or networking permitted without lcense from IHS6roracc32%2o093g91Tg0CONTENTSPage0 INTRODUCTION.1 SCOPE2 NORMATIVE REFERENCES.12.1 API Normative Standards.2.2ASTM Normative Standards.2.3ASME Normative Standards3 TERMINOLOGY3.1 Definitions.3.2 Units of Measurement.33.3 Nomenclature.434 SUMMARY OF TEST METHOD.45 SIGNIFICANCE AND USE.6 LIMITATIONS TO TEST METHOD046.1 Evaluation of Results.46.2 Low Loss Rates.47 TEST APPARATUS.7.1 Test Apparatus Schematic.47.2 Test Room.47.3 Test7.4 Inlet Air Flow Control Section.87.5Outlet Air Flow Control Section.87.6Air Blower.7.7.8Vibration Damping.87.8 Rim Seals.87.9 Test Liquid.87.10 Emptying and Filling97.11Spill Pan.98 TEST ITEM.98.1 Test Item Construction.98.2 Test Rim Seal Attachment.8.3 Test Rim Seal End Connections998.4 Tall Rim Seals.99 PREPARATION OF APPARATUS.99.】Test Item Placement99.2 Test Room Air Temperature Control.99.3 Air Blower Startup.99.4 Steady-State Operation.910 INSTRUMENTATION AND CALIBRATION910.】Accuracy910.2 Data Acquisition System.10No reproduction or networking permitted without lcense from IHSeoReaecBg2os098a91Tg9