Active Standard: D5191 - 13
Section 6.4 states, Iced Water Bath, Refrigerator, or Air Bath, for chilling the samples and syringe to temperatures between 0 to 1C (32 to 34F). With respect to chilling the samples to temperatures between 0 to 1C (32 to 34F), the method is consistent in identifying this temperature range, such as in sections 8.2 (Sampling Handling TemperaturePlace the sample container and contents in an ice bath or refrigerator to the 0 to 1C (32 to 34F) range prior to opening the sample container. . . .), 8.3 (Verification of Sample Container FillingWith the sample at a temperature of 0 to 1C, . . .), and 8.4.2 (With the sample again at a temperature of 0 to 1C, take the container from the cooling bath or refrigerator, . . .). With respect to chilling the syringe to temperatures between 0 to 1C (32 to 34F) however as per section 6.4, there is a disconnect in section 9.3 which states, If a syringe is used for introduction of the sample specimen, chill it to between 0 and 4.5C (32 and 40F) in a refrigerator or ice bath before drawing in the sample. . . .. The proposed revision is to update section 9.3 to chill the syringe to between 0 and 1C (32 to 34F) to be consistent with section 6.4, as well as define the functional requirement that needs to be met for the syringe (i.e., avoid water contamination of the syringe reservoir during the cooling procedure) without being overly prescriptive how to achieve that result. A separate revision in D5188 is being proposed as well to make the language involving the use of a syringe in both methods consistent.
Keywordsdry vapor pressure; gasoline; hydrocarbon-oxygenate blends; mini method; petroleum products; vapor pressure;
Ballot Item Approved as D5191-2013 and Pending Publication