Ex.No: Date:
DETERMINATION
OF FLASH AND FIRE POINT OF OIL BY PENSKY MARTEN
CLOSED
CUP APPARATUS
Aim:
To determine flash and fire point of a
given sample of oil by using Pensky Marten closed cup apparatus.
Apparatus
Required:
• Pensky Marten closed cup apparatus
•
Oil sample
•
Thermometer
Principle:
Flash
point
is the lowest temperature at which the lubricating oil gives off enough vapors
that ignite for a moment when tiny flame is brought near it.
Fire
point
is the lowest temperature at which the vapors of the oil burn continuously for
at least five seconds when a tiny flame is brought near it
Significance:
Flash and fire points are used to indicate
• Fire hazard of petroleum products and
evaporation loses under high temperature loses,
• It gives us the idea about the maximum
temperature below which the oil can be used,
• It is used as the means of
identification of specific lubricating oil,
• For detection of contamination in the
given lubricating oil.
Procedure:
1. Check up the heater working condition
of Pensky Marten closed-cup apparatus.
2. Fill up the given sample of oil up to
the required level.
3. Place the thermometer and stirrer
inside the oil.
4. Switch on the heater and stirrer.
5. Initially regulate the heater to rise
in temperature of oil 6 o ±1 o per minute
6. On approaching the flash point the rate
is reduced to 3 o ± 0.5 o per minute
7. Place the flame just above the surface
of the oil.
8. At one point, a bluish flame appears
and it will last for only a fraction of a second.
9. This is the FLASH point temperature of
the given sample of oil.
10. Increase the temperature of the oil
further and again place the flame just above the surface of the oil.
11. At one point, a reddish or yellowish
flame will appear and it will burn continuously.
12. This is the FIRE point temperature of
the oil.
13. Remove the stirrer from the Pensky
Marten apparatus.
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: |
|
|
Composed By:
R.Satheesh, M.E.,
Asso.Prof.,
