Ex.No: Date:
DETERMINATION OF FLASH AND FIRE POINT
OF OIL BY
CLEVELAND
OPEN CUP APPARATUS
Aim:
To
find the flash and fire point of the given oil using Cleveland's apparatus
Apparatus Required
1
Cleveland's cup apparatus 2. Thermometer
Principle:
Mineral Oil when
heated sufficiently to high temperature decomposes chemically to hydrocarbons
& chemically breakup into volatile combustible gases. Flash point is the
lowest temperature at which it forms vapours and produces combustible mixture
with air. This is the formation of compressible and slightly explosive gas
mixture before the surface of the oil. Fire point or the burning point is the
lowest temperature at which the production of combustible gases from the oil is
enough to maintain steady state after ignition.
Procedure:
• The open cup is filled with the given
sample oil up to the standard filling mark in the cup.
• The thermometer is held in the oil in
such a way that it does not touch the metallic part.
• The sample of oil is heated so that it
gives on vapor.
• At the testing time the test flames is
applied by heating short distance over the surface of oil and watched for
flickering sound.
• The minimum temperature at which a
momentary flash is obtained is called flash point.
• Heating is continued after obtaining the
flash point. The lowest temperature at which the ignited vapour continues to
burn is called fire point.
• Note the flash point and fire point of
the given oil in a separate tabular column.
Tabulation:
|
Name of oil |
Flash point °c |
Fire point °c |
|
|
|
|
Result:
Thus
the flash point and fire point of given sample oil are found out as follows;
a)
The flash point = ___________°C
b)
The fire point = ___________ °C
|
PO Attainment: |
|
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Composed By:
R.Satheesh, M.E.,
Asso.Prof.,
