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API MPMS 8.4-2017 pdf free download

API MPMS 8.4-2017 pdf free download.Manual of Petroleum Measurement Standards Chapter 8.4 Standard Practice for Sampling and Handling of Fuels for Volatility Measurement.
1. Scope* 1.1 This practice covers procedures and equipment for obtaining, mixing, and handling representative samples of volatile fuels for the purpose oftesting for compliance with the standards set forth for volatility related measurements appli- cable to light fuels. 1.2 The applicable dry vapor pressure equivalent range of this practice is 13 kPa to 110 kPa (2 psia to 16 psia). 1.3 This practice is applicable to the sampling, mixing, and handling of reformulated fuels including those containing oxygenates. This practice is not applicable to crude oil. For the sampling of crude oil, refer to Practice D4057/API MPMS Chapter 8.1, Practice D4177/API MPMS Chapter 8.2, and Practice D8009/API MPMS Chapter 8.5. 1.4 The values stated in SI units are to be regarded as the standard except in some cases where drawings may show inch-pound measurements, which are customary for that equip- ment. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility ofthe user ofthis standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Significance and Use 5.1 The vapor pressure parameters of volatile motor fuels are regulated by federal and state air pollution control agencies. In order to meet the letter of these regulations, it is necessary to sample, handle, and test these products in the precise manner as prescribed in this practice. 6. General Comments 6.1 Sample Containers: 6.1.1 Sample containers are clear or brown glass bottles, fluorinated high-density polyethylene bottles, or metal cans. The clear glass bottle is advantageous because it is easily examined visually for cleanliness, and also makes visual inspection of the sample for free water or solid impurities possible. The brown glass bottle affords some protection from light. The only seamed cans acceptable are those with the seams soldered on the exterior surface. 6.1.2 Screw caps of plastic or metal shall be used for all glass bottles. The caps for glass and metal containers shall have a seal to provide a vapor-tight closure. Inverted cone polyseals, polytetrafluoroethylene (PTFE)-faced media, or other materials that will not be affected by petroleum products shall be used as seals. Ifused, cork seals shall be ofgood quality, be clean, have an intact sealing surface that is faced with tin or aluminum foil, and be free from holes and loose bits of cork. The fluorinated bottles are supplied with polypropylene screw caps. Regardless of the bottle or can type, the screw cap shall be selected to ensure the sample integrity for the duration ofthe sample retain period. 6.1.3 Sample size is dictated by the test method to be performed. One litre (32 oz) bottles or cans are generally used for manual vapor pressure testing. Some vapor pressure meth- ods may allow a smaller sample size to be taken, such as in a 125 mL (4 oz) bottle. See Fig. 1.
6.3.3 Tank Cars—Sample the product after the car is loaded or just before unloading. N OTE 1—Time, place, and other details of sampling not covered in this practice are normally determined by contractual agreement or regulatory requirements. 6.4 Obtaining Samples: 6.4.1 Extreme care and good judgment are necessary to ensure samples that represent the general character and average condition ofthe material. Use lint-free wiping cloths to prevent contaminating samples. 6.4.2 Many petroleum vapors are toxic and flammable. Avoid breathing them or igniting them from an open flame or a spark. Follow all safety precautions specific to the material being sampled. 6.4.3 Do not sample dead legs or relieflines. Do not sample stand pipes that are not slotted or perforated. Fig. 2 is an example ofan adequately slotted stand pipe. At a minimum, the stand pipe should have two rows of slots slightly staggered in the vertical plane.

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