BS EN 16091:2011 pdf download

BS EN 16091:2011 pdf download.Liquid petroleum products ——Middle distillates and fatty acid methyl ester (FAME) fuels and blends — Determination of oxidation stability by rapidsmall scale oxidation method.
9 Preparation of the apparatus
9.1 Remove the previous test portion by means of a pipette or similar device.
9.2 Remove the used 0-ring seal and discard.
NOTE To avoid contamination of the new test. it is necessary to discwd the used 0-ring seal, because it may be
soaited with oxidation products from the previous test
9.3 WIpe the sample cup, the seal woove and the cover with lint-free cleaning tissue (5.3) soaked with
deaning solvent (5.1) until free of gum or other oxidation residues.
9.4 Allow the test sample cup and cover to dry in air and visually inspect for cleanliness.
NOTE Compressed air Is generally unsuitable to accelerate the evaporation of edvent because It can contain traces of oil that may Influence the next test,
9.5 Insert a new O-hng seal (6.3).
10 Procedure
10.1 Bnng the reaction vessel and the sample to be tested to room temperature.
10.2 Using a pipette (6.2). place 5 ml ± OlmI of the sample into the reaction vessel sample cup.
10.3 Cover the sample-cup with the screw cap (see A.2) and dose the reaction vessel.
10.4 Pre-flush the reaction vessel with oxygen. Introduce oxygen (5.2) into the vessel until a pressure of
700 kPa t 5 kPa is attained and stabilized over 20 sec
10.5 Start the heater with no delay between charging with oxygen and starling the test.
10.6 The test temperature of 140 °C ± 0.5°C shaH be reached after 270s ± 30s.
10.7 If, during the initial 5 mm of the test, a steady drop I, pressure is observed, discontinue the test and discard the test spectrnen.
The leakage rate at 140°C with empty sample cup shall not exceed a value of 2 kPa/h. If the leakage rate shows an increase, check the following components:
• O-nng for damage or residues of samples.
• surface of sample cup for damage, and
• sample cup for sample residues,
Contact the manufacturer to resolve leakage problems from other parts of the instrument.
10.8 The apparatus automaticaNy records the temperature (to the nearest 0,1 °C) and pressure (to the nearest 1 kPa) of the oxidation vessel continuously.
10.9 The apparatus terminates the test when the pressure readings show a 10 % drop from the maximum observed pressure (breakpoint) and records the time elapsed from the start of the test to the breakpoint (induction period). An example is given 11 Annex C.
10.10 The apparatus automatically records the average temperature to the nearest 0.1 °C as the temperature of the test.
A.3 Reaction vessel
Inner diameter 47 mm and internal volume without sample of 20 ml. Made of aluminium alloy or other corrosion-resistant metal of similar thermal conductivity, with a cylindrical depression (test cup). and with a hole in the side to accommodate a temperature sensor (A.9).
The intenor surface of the test cup is covered with galvanic coating and smoothly pol&ed.
A.4 Screw cap
Made of aluminium alloy or other corrosion-resistant metal of similar thermal conductivity. Interior surface of the screw cap covered with galvanic coating, smoothly polished.
A.5 Electric heater
Power rating 500W; attached to the bottom of the test cup in a manner that provides efficient transfer of heat. The heater control shall be capable of maintaining the test cup temperature within t 0,5 °C for test tern peraliires up to and including 140 °C.
A.6 O-nng seals
Made of material being resistant to oxygen, middle distillate fuel components, FAME and heat, typically fluoro. elastomer FPMIFKM (commonly known as Viton®1), coaled with PTFE.
A.7 Valves
Solenoid with snial dead volume and orifice sizes and short cyding rate5
A.8 Pressure sensor
Absolute or relative pressure transducer with a pressure range of 0 kPa to 2 000 kPa and a typical sensitivity of between (1 to 2.5) mVfkPa. Capable of being operated at temperatures up to 150 °C and calibrated and/or verified against an instrljnent certified by an authorized certification body.
A.9 Temperature sensor
Platinum thermometer capable of reading up to 200 °C ± 0.1 °C. calibrated andfor verified against an instrument certified by an authorized certification body.
A.1O Connecting pipes
Typical inner diameter: 0.5 mm to 1 mm.