API MPM CH19.3B : 1997

MANUAL OF PETROLEUM MEASUREMENT STANDARDS - EVAPORATIVE LOSS MEASUREMENT - AIR CONCENTRATION TEST METHOD - RIM-SEAL LOSS FACTORS FOR FLOATING-ROOF TANKS

American Petroleum Institute

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INTRODUCTION
1 SCOPE
2 NORMATIVE REFERENCES
    2.1 API Normative Standards
    2.2 ASTM Normative Standards
    2.3 ASME Normative Standards
3 TERMINOLOGY
    3.1 Definitions
    3.2 Units of Measurement
    3.3 Nomenclature
4 SUMMARY OF TEST METHOD
5 SIGNIFICANCE AND USE
6 LIMITATIONS TO TEST METHOD
    6.1 Evaluation of Results
    6.2 Low Loss Rates
7 TEST APPARATUS
    7.1 Test Apparatus Schematic
    7.2 Test Room
    7.3 Test Chamber
    7.4 Inlet Air Flow Control Section
    7.5 Outlet Air Flow Control Section
    7.6 Air Blower
    7.7 Vibration Damping
    7.8 Rim Seals
    7.9 Test Liquid
    7.10 Emptying and Filling
    7.11 SpillPan
8 TEST ITEM
    8.1 Test Item Construction
    8.2 Test Rim Seal Attachment
    8.3 Test Rim Seal End Connections
    8.4 Tall Rim Seals
9 PREPARATION OF APPARATUS
    9.1 Test Item Placement
    9.2 Test Room Air Temperature Control
    9.3 Air Blower Startup
    9.4 Steady-State Operation
10 INSTRUMENTATION AND CALIBRATION
    10.1 Accuracy
    10.2 Data Acquisition System
    10.3 Temperature Measurement
    10.4 Wind Speed Measurement
    10.5 Concentration Measurement
    10.6 Atmospheric Pressure Measurement
    10.7 Static Pressure Measurement
    10.8 Differential Pressure Measurement
11 TEST PROCEDURE
    11.1 Rim-Seal Gaps
    11.2 Levels of Wind Speed
    11.3 Data to be Recorded
    11.4 Duration of Test
12 CALCULATION OF TEST RESULTS
    12.1 Calibration Corrections
    12.2 Rim-Seal Loss Rate
    12.3 Vapor Pressure Function
    12.4 Rim-Seal Loss Factor
    12.5 Uncertainty Analysis
13 REPORT OF TEST RESULTS
    13.1 Report
    13.2 Data Curves
    13.3 Rim-Seal Loss Factor Graph
14 PRECISION AND BIAS
APPENDIX A - UNCERTAINTY ANALYSIS
APPENDIX B - WIND SPEED CALIBRATION
APPENDIX C - DETERMINATION OF LOSS FACTOR EQUATION
APPENDIX D - METRIC UNITS
APPENDIX E - BIBLIOGRAPHY
Figures
1 Plan View of the Air Concentration Test Facility
2 Elevation View of the Air Concentration Test Facility
3 Section View of the Air Concentration Test Facility
4 Typical Data Curve (Rim-Seal Loss Rate)
5 Typical Rim-Seal Loss Factor Graph
Tables
1 Instrument Requirements
    A-1 Summary of Example Uncertainty Analysis Results
    C-1 Examples Loss Factors
    C-2 Example Loss Factor Equation Database
    C-3 Example Loss Factor Equation Constants

Abstract

Specifies the procedures to establish evaporative rim-seal loss factors for rim seals used on external floating-roof tanks as part of API's Tank Seals and Fittings Certification Program. Includes test apparatus, instruments, and calculation procedures to be used.