MANUAL OF PETROLEUM MEASUREMENT STANDARDS - EVAPORATIVE LOSS MEASUREMENT - WEIGHT LOSS TEST METHOD FOR THE MEASUREMENT OF DECK-FITTING LOSS FACTORS FOR INTERNAL FLOATING-ROOF TANKS
American Petroleum Institute
0 INTRODUCTION
1 SCOPE
2 REFERENCES
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 THE 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 Vessels
7.4 Data Acquisition Room
8 TEST ITEM
8.1 Test Item Assembly
8.2 Fitting Attachment
8.3 Tall Fittings
9 PREPARATION OF APPARATUS
9.1 Test Assembly Placement
9.2 Test Room Air Temperature Control
9.3 Data Acquisition Room Air Temperature Control
9.4 Steady State Operation
10 INSTRUMENTATION AND CALIBRATION
10.1 Accuracy
10.2 Data Acquisition System
10.3 Weight Measurement
10.4 Temperature Measurement
10.5 Voltage Measurement
10.6 Atmospheric Pressure Measurement
11 TEST PROCEDURE
11.1 Data to be Recorded
11.2 Duration of Test
12 CALCULATION OF TEST RESULTS
12.1 Calibration Corrections
12.2 Loss Rate
12.3 Vapor Pressure Function
12.4 Loss Factor
12.5 Multiple Tests
12.6 Uncertainty Analysis
13 REPORT OF TEST RESULTS
13.1 Report
13.2 Loss Rate Curve
14 PRECISION AND BIAS
APPENDIX A - LOSS RATE DETERMINATION
APPENDIX B - UNCERTAINTY ANALYSIS
APPENDIX C - METRIC UNITS
APPENDIX D - BIBLIOGRAPHY
Figures
1 - Plan View of a Typical Weight Loss Test Facility
2 - Elevation View of a Typical Weight Loss Test
Facility (Description of Test Apparatus Typical
of Each)
3 - Test Assembly
4 - Typical Loss Rate Curve
A-1 - Measured and Calculated Weight Loss Versus Time
A-2 - Corrected and Correlated Weight Loss Versus Time
Tables
1 - Nomenclature
2 - Instrument Requirements
A-1 - Nomenclature for Appendix A
B-1 - Nomenclature for Appendix B
B-2 - Summary of Example Uncertainty Analysis Results
This document is to establish a uniform method for use in measuring the evaporative loss factors - deck fittings of floating-roof tanks (internal). A test method involves measuring the weight loss re a test assembly over time. This document specifies the instruments, the test procedures, test apparatus and calculation procedures used. The document may also involve operations, hazardous materials and equipment, it does not purport to address all of the safety problems associated in its use. The responsibility lies with the user of this document to establish the appropriate health and safety practices to determine the applicability of regulatory limitations before using.
| Document Type | Standard |
| Status | Current |
| Publisher | American Petroleum Institute |
| ProductNote | Reconfirmed 1997 |
