1、Manual of Petroleum Measurement StandardsChapter 17.4Method for Quantification of Small Volumes on Marine Vessels (OBQ/ROB)SECOND EDITION, SEPTEMBER 2016Special Notes API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federa
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21、gested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org. iiiContents1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . 12 Normative References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . . . . . . 14 Safety and Health Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.2 Static Electricity Hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.3 Health Hazards. . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Quantification Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1 General . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2 Gauging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . 45.3 Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.4 Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.5 Vessel Cargo Lines and Pumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.6 Slops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 OBQ/ROB Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.1 General . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2 Liquid Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56.
31、3 Nonliquid Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Calculating Quantities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . 5Annex A (normative) Small Volume Calculations and Configuration Equations . . . . . . . . . . . . . . . . . . . . . . . . . . 6Annex B (informative) On Board Quantity/Remaining On Board Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Annex C (norma
33、tive) Wedge Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、 . . . . . . 25FiguresA.1 Nonliquid Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7A.2 Single Liquid in Contact with All Four Bulkheads. . . . . . . . . . . . . . . . . . . . . . . . . . . .
35、. . . . . . . . . . . . . . . . . . 8A.3 Single Liquid in Contact with Three Bulkheads Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9A.4 Single Liquid above Nonliquid (Liquid in Contact with All Four Bulkheads). . . . . . . . . . . . . . . . . . . . . .
36、. 11A.5 Single Liquid above Nonliquid (Liquid in Contact with Three Bulkheads Only) . . . . . . . . . . . . . . . . . . . . 12A.6 Two Liquids (Both Liquids in Contact with All Four Bulkheads). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A.7 Two Liquids (Lower Liquid in Contact
37、with Three Bulkheads Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14A.8 Two Liquids (Both Liquids in Contact with Three Bulkheads Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15A.9 Two Liquids with a Nonliquid Lower Layer (Lower Layer Liquid in Contact with
38、Three Bulkheads Only) . .15A.10 Two Liquids with a Nonliquid Lower Layer (Lower Layer Liquid in Contact with All Four Bulkheads) . . . 17A.11 Two Liquids with a Nonliquid Lower Layer (Both Liquids in Contact with Three Bulkheads Only). . . . 17vIntroduction The purpose of this standard is to provide
39、 a method for determining the small volumes of on board quantity (OBQ) prior to loading a vessel or material remaining on board (ROB) a vessel upon completion of discharge. 1 Method for Quantification of Small Volumes on Marine Vessels (OBQ/ROB)1 Scope This standard applies only to quantification by
40、 manual gauging of small volumes on marine vessels prior to loading or upon completion of discharge. It does not address clingage, hydrocarbon vapors, cargoes in transit, or cargo pumpability. Refer to API Manual of Petroleum Measurement Standards (MPMS) Chapter 3. 2 Normative References The followi
41、ng referenced documents are indispensable for the application 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 (all relevant sections), Tank GaugingAPI
42、MPMS Chapter 3.1A, Standard Practice for the Manual Gauging of Petroleum and Petroleum Products API MPMS Chapter 7, Temperature Determination API MPMS Chapter 8.1, Manual Sampling of Petroleum and Petroleum Products API MPMS Chapter 12.1.1, Calculation of Static Petroleum QuantitiesUpright Cylindric
43、al Tanks and Marine Vessels API MPMS Chapter 17.1, Guidelines for Marine Inspection API MPMS Chapter 17.2, Measurement of Cargoes On Board Tank Vessels API MPMS Chapter 17.11, Measurement and Sampling of Cargoes On Board Tank Vessels Using Closed and Restricted Equipment 3 Terms and Definitions For
44、the purposes of this standard, the following terms and definitions apply. Other terms used in this standard are defined in API MPMS Chapter 1 or other API petroleum-measurement standards. 3.1 clingage Cargo that adheres to all surfaces of the emptied portion of the tank other than bottom surfaces. 3
45、.2 liquid volume The measurable amount of material that is free-flowing at the time of measurement. 3.3 multipoint gauging The activity of measuring cargo in a vessel tank through two or more openings in the top of the tank. 2 API MPMS CHAPTER 17.4 3.4 nonliquid volume The measurable amount of mater
46、ial that is not free-flowing at the time of measurement. Nonliquid material may include any one or a combination of hydrocarbon waxes, water/oil emulsions, sediment, or solidified cargo. 3.5 on board quantity OBQ The material in a vessels cargo tanks and piping before the cargo is loaded. 3.6 remain
47、ing on board ROB The material remaining in a vessels cargo tanks and piping after the cargo is discharged. 3.7 sediment Solid materials including, but not limited to, sand, rust, and scale. 3.8 slops Oil, oil/water/sediment, and emulsions contained in slop tanks or designated cargo tanks. The mixtur
48、e usually results from tank stripping, tank washing, or dirty ballast phase separation. 3.9 sludge That element of the material in a ships cargo tank that is essentially not free-flowing. Sludge consists of hydrocarbon waxes and may contain water/oil emulsions and sediment. The use of this term is n
49、ot recommended. 3.10 wedge formula A mathematical means to approximate small quantities of measurable liquid and/or nonliquid material on board that is in a wedge configuration and does not touch all bulkheads of the vessels tank. The formula is based on cargo compartment characteristics, vessel trim, and the depth of the material. 3.11 wedge table A vessels cargo tank volume table calculated on the wedge formula for use when cargo does not touch all bulkheads of the tanks. Wedge tables preclude the need for calculation by wedge formula at times of cargo transfer. 4 Safety and Healt
