ISO 6249 pdf download

ISO 6249 pdf download.Petroleum products — Determination of thermal oxidation stability of gas turbine fuels — JFTOT method 1 Scope This International Standard specifies a procedure for rating the tendencies of gas turbine fuels to deposit decomposition products within the fuel system. It is applicable to middle distillate and wide-cut fuels, and is particularly specified for the performance of aviation gas turbine fuels. The test results are indicative of fuel stability during gas turbine operation and can be used to assess the level of deposits that form when liquid fuel contacts a heated surface at a specified temperature. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative references indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 31 70:1 988, Petroleum liquids — Manual sampling. ISO 31 70:1 988/Amd. 1 :1 998. ISO 31 71 :1 988, Petroleum liquids — Automatic pipeline sampling . 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 heater tube aluminium tube controlled at an elevated temperature, over which the test fuel is pumped; the tube is resistively heated and temperature controlled by a thermocouple positioned inside it NOTE The critical test area is the 60 mm thinner portion between the shoulders of the tube. The fuel inlet to the tube is at the 0 mm position, and the fuel exit is at 60 mm. 3.2 decomposition product oxidative product laid down on the heater tube in a relatively small area of the thinner portion of the tube, typically between the 30 mm and 50 mm position from the fuel inlet,and that trapped in the test filter 4 Principle The jet fuel thermal oxidation tester (JFTOT) subjects the test fuel to conditions which can be related to those occurring in gas turbine engine fuel systems. The fuel is pumped under pressure at a fixed volumetric flow rate through a heater, after which it enters a precision stainless-steel filter where fuel degradation products may become trapped....