D3241_11 (18) 04-2018

Filter an aerate sample using standard operating conditions. See A5.2.9 of the written standard. Warning-- all jet fuels must be considered flammable except JP-5 and JP-7. Vapors are harmful. See A6.3, A6.6, and A6.7 of the written standard. Before operating, see warning in 6.1.1 of the written standard. Test method results are known to be sensitive to trace contamination from sampling containers. For recommended containers, refer to Practice D4306. Maintain temperature of sample between 15 degrees Celsius and 32 degrees Celsius during aeration. Put reservoir containing sample into hot or cold water bath to change temperature if necessary. Allow no more than 1 hour to elapse between the end of aeration and the start of the heating of the sample. Assemble the reservoir section. See user manual. Install reservoir and connect lines appropriate to the instrument model being used. See user manual. Remove protective cap and connect fuel outlet line to heater section. Do this quickly to minimize loss of fuel. Check all lines to ensure tightness. Recheck thermocouple position at 39 millimeters. Make sure drip receiver is empty, models 230 and 240 only. Turn power to On. Energize the Delta P alarm on models with manual alarm switch-- models 202, 203, and 215. Pressurize the system slowly to about 3.45 megapascals, as directed in the user manuals for models 202, 203, and 215. See also A5.2.5 of the written standard. Inspect the system for leaks. Depressurize the system as necessary to tighten any leaking fittings. Set controls to the standard operating conditions. Use a heater tube control temperature as specified for the fuel being tested. Apply any thermocouple correction from the most recent calibration. See A5.2.8 of the written standard. The test can be run to a maximum tube temperature of about 350 degrees Celsius. The temperature at which the test should be run and the criteria for judging results are normally embodied in fuel specifications. Use procedure for each model as described in the appropriate user manual. Some instrument models may do the following steps automatically, but verify that no more than 1 hour maximum elapses from aeration to start of heating. The manometer bypass valve is closed as soon as the heater tube temperature reaches the test level so fuel flows through the test filter. See A5.2.6 of the written standard. Manometer is set to 0. See A5.2.6 of the written standard. Check fuel flow rate against standard operating conditions by timing flow or counting the drip rate during first 15 minutes of test. See X1.5 of the written standard. When counting drop rate, the first drop is counted as drop 0, and time is started. As drop 20 falls, total time is noted. Record filter pressure drop every 30 minutes minimum during the testing period. If the filter pressure drop begins to rise sharply and it is desired to run a full 150-minute test, a bypass valve common to all models must be opened in order to finish the test. See appropriate user manual for details on operation of the bypass system. See A5.2.2 of the written standard. Make another flow check within final 15 minutes before shutdown. See 11.4.3 of the written standard and accompanying note. See X1.5 of the written standard. If a heater tube temperature profile is desired, obtain as described in X1.4 of the written standard. For models 202, 203, and 215 only. Switch the heater, then pump, to Off. Close nitrogen pressure valve and open manual bypass valve. Open nitrogen bleed valve slowly, if used, to allow system pressure to decrease at an approximate rate of 0.15 megapascals. Models 230 and 240 shut down automatically. After shutdown, turn flow selector valve to Vent to relieve pressure. Piston actuator will retreat automatically. Measure affluent in drip receiver, then empty. Disconnect fuel inlet line to the heater section and cap to prevent fuel leakage from reservoir. Disconnect heater section. Remove heater tube from heater section carefully so as to avoid touching center part of tube, and discard test filter. Flush tube with recommended general cleaning solvent-- see 7.2 of the written standard-- from top down. If the tube is grasped from the top, do not wash solvent over gloves or bare fingers. Allow to dry. Return tube to original container, mark with identification, and hold for evaluation. Disconnect reservoir. Measure the amount of spent fluid pumped during the test and reject the test if the amount is less than 405 milliliters. Discard fuel to waste disposal.