API MPMS 17.11 -2016 pdf free download

API MPMS 17.11 -2016 pdf free download.Manual of Petroleum Measurement Standards Chapter 17.11 Measurement and Sampling of Cargoes On Board Tank Vessels Using Closed and Restricted Equipment.
3.4 decanting To pour (a liquid) from one container into another. 3.5 density For a quantity of a homogeneous substance, the ratio of its mass to its volume. The density varies as the temperature changes and is therefore generally expressed as the mass per unit of volume at a specified temperature. 3.6 flash point The minimum temperature to which a product shall be heated for the vapors emitted to ignite momentarily in the presence of a flame when operating under standardized test conditions and for the flame to propagate across the liquid surface. 3.7 inert gas Gas that does not react with the surroundings. 3.8 inerting A procedure used to reduce the oxygen content of a vessel’s cargo spaces by introducing an inert gas such as nitrogen or carbon dioxide or a mixture of gases such as processed flue gas. 3.9 portable sampling unit PSU Intrinsically safe device used in conjunction with a vapor control valve to obtain required cargo samples under closed or restricted system conditions. 3.10 portable measurement unit PMU Intrinsically safe device used in conjunction with a vapor control valve to obtain required liquid level and/or temperatures under closed or restricted system conditions. 3.11 on board quantity OBQ Refers to materials present in a vessel’s cargo tanks, void spaces, and/or pipelines before the vessel is loaded. On board quantity includes a combination of water, oil, slops, oil residue, oil/water emulsions, sludge, and sediment. 3.12 remaining on board ROB Material remaining in a vessel’s cargo tanks, void spaces, and/or pipelines after the cargo is discharged. ROB includes any combination of water, oil, slops, oil residue, oil/water emulsions, sludge, and sediment. 3.13 standpipe A vertical section of pipe extending from the top of a marine vessel tank through which measurements and samples of tank contents can be obtained.
NOTE Standpipes are frequently fitted with vapor control valves to allow closed or restricted operation. The pipe should extend to the floor of the tank with the internal part (also called “stilling well” or “still pipe”) slotted to allow free flow of tank contents while providing guidance for gauging and sampling equipment. 3.14 static accumulator oils Oils having a conductivity of less than 50 pS/m; these oils relax (dissipate charge) slowly. 3.15 UTI Ullage, temperature, and interface 3.16 vapor control valve VCV Valve fitted on a standpipe, expansion trunk, or the deck that permits use of the portable handheld gauging instruments while restricting the release of vapors into the atmosphere. 3.17 vapor pressure RVP, TVP Reid vapor pressure (RVP): The vapor pressure of a liquid at 1 00 ° F (37.8 ° C, 311 ° K) as determined by ASTM D323. True vapor pressure (TVP): The pressure at which the fluid is in equilibrium between its liquid and gas state. 3.18 volatile organic compounds VOCs Organic chemicals that have a high vapor pressure and easily form vapors at normal temperature and pressure. 3.19 washing, crude oil COW Use of a high pressure stream of the crude oil cargo to dislodge or dissolve clingage and sediment from the bulkheads, bottom, and internal tank structures of a vessel during the discharge operation. 4 Health and Safety Precautions 4.1 General Personnel involved with the gauging and sampling of petroleum and petroleum-related substances should be familiar with their physical and chemical characteristics, including potential for fire, explosion, and reactivity, and with the appropriate emergency procedures as well as potential toxicity and health hazards. Personnel should comply with the individual company safe operating practices and with local, state, federal, and national regulations, including the use of appropriate protective clothing and equipment.