Difference between revisions of "Pensky-Martens Closed Cup Test Procedure"

Revision as of 08:51, 6 December 2011

Summary

The Pensky-Martens Closed Cup Tester can be used to determine the flashpoint of a petroleum product in the temperature range 40-360°C. The procedure used to determine the flashpoint is dependent on the petroleum product. Procedure A applies to distillate fuels such as diesel or kerosene, while procedure B is applicable to residual fuel oils, petroleum liquids that form a surface film under test conditions and used lubricating oils amongst others. The sample is contained in a brass test cup which is placed inside the apparatus and fitted with a testcover. The sample contained in the test cup is heated and stirred simultaneously. An external ignition source is periodically directed into the test cup (this momentarily interrupts the stirring). This is done until a flash is observed (meaning the sample has reached its flashpoint).

Apparatus Preparation

• The apparatus should be supported on a level surface such as a table.

• The test should under all circumstances be performed in a fume hood

• Thoroughly clean the test cup using acetone and ensure it is completely dry after being cleaned (acetone is flammable!).

• Ensure that a properly calibrated thermometer is inserted into the apparatus.

• Ensure that the gas cylinder is properly connected to the flashpoint apparatus.