1 Standard Method Of Test For Flash Point By Pensky Closed Tester @ Www.07 Met.TkDocument Transcript
Flash point is the lowest temperature at which the application of the
test flame causes the vapor above the sample to ignite.
This method covers the determination of flash point of fuel oils and be
used for the detection of contamination of lubricating oils by minor
amount of volatile material.
The sample is heated at a slow constant rate with continues stirring. A
small flame is directed into the cup at regular intervals with
simultaneous interruption of stirring.
*Pesky Marter Closed Tester
1) Support the tester on a level, steady table in draft free room is good
2) Prepare bathe sample
a)-A sample of asphalt is heated to liquid but below to its flash point.
b)-A sample with water is dehydrated by calcium chloride or filtering
through a qualitative filter paper or a loose plug of dry absorbent
cotton. Then warmed the sample to liquid but below its flash point.
3) Thoroughly cleaned and dried all parts of cup and its accessories
before starting the test.
4) Filled the cup with the sample to the filling mark.
5) Placed the lid on the cup and placed on the stove.
6) Ensured the locating or locking device properly engaged.
7) Insert the thermometer and lighted the flame and adjusted it to 5/32
in. in diameter.
8) Supplied heat at rate that thermometer showed 5oC/min.
9) Checked the flash point at regular intervals for about 1 sec.
10) When temperature reached to 45oC, the flame blow off, it gave
flash point of the sample.
Flash point is 45 c
•Note temperature reading on thermometer carefully.
•Never mix the true flash point with the bluish halo that sometimes
surrounds the actual flame.