The EN ISO 2592 standard, developed by the International Standards Organization (ISO), specifies a procedure for determining the flash and fire points of petroleum products using the Cleveland open cup apparatus. It is applicable to petroleum products with open cup flash points between 2719 °C and 79 °C, excluding fuel oils most commonly tested by the closed-cup procedure described in ISO 400.
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The test cup is filled to a certain level with the test portion. The temperature of the test piece can be increased first rapidly (5°C/min to 17 °C/min) and then at a slow steady rate (5 °C/min to 17 °C/min). When approaching the flash point of 6 °C/min, a small test from the test cup at the specified temperature ranges
flame is passed.
The lowest temperature at which application of the test flame causes the vapor above the liquid surface to ignite is taken as the flash point at ambient barometric pressure. To determine the ignition point, application of the test flame causes the vapor above the test section to ignite and burn for at least 5 seconds.
until the test continues. The flash point and fire point obtained at ambient barometric pressure are corrected to standard atmospheric pressure using a formula.
The choice of solvent depends on the prior material tested and the stability of the residue. Low volatility aromatic (unlike) solvents can be used to remove oil residues, and mixed solvents can be effective for removing gum-type deposits.
EN ISO 2592 specifies a procedure for determining the flash and fire points of petroleum products using the Cleveland open cup apparatus. It is applicable to petroleum products with open cup flash points between 2719 °C and 79 °C, excluding fuel oils most commonly tested by the closed-cup procedure described in ISO 400.
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