BLG 4/18
ANNEX 7
Page 3
The Cloud Point Temperature ℃ = 20.2 (10 0.00708x-0.1157714)+8
Worked example:
Assume the Pour Point Temperature is + 1℃
Then:
= 20.2x(10(0.00708x1)-0.1157714)+8
= 20.2x(100.00708-0.1157714)+8
= 20.2x(10-0.l086914)+8
= (20.2x0.7785896)+8
= 15.72+8
Answer: Approx. Cloud Point ℃ = 24℃
OR
Consult the accompanying graph, (Fig 1) where if the Pour Point is known then the Cloud Point can be extracted.
OR
If the Pour Point exceeds Approximately 25℃ then the Bondi test procedure could be used to determine this temperature.
The Bondi Test Procedure (See Fig 2)
This method will obtain the cloud point temperature of high pour point type crude oils.
Equipment and Procedure
(1) Obtain a representative sample of the cargo. Do not allow the Cargo sample to cool before commencing the test procedure.
(2) Obtain a glass container (preferably nearly spherical) that is made of heat/temperature resistant glass and fill the container with the sample.
(3) Insert a thermometer into the centre of the sample volume and heat the sample to a temperature of at least 30℃ above the pour point temperature of the crude oil in a hot water bath. Do not tightly stopper the container during this process.
(4) Prepare an alternative bath with water whose temperature is at least 15℃ below he sample's pour point temperature. Have a clock or watch available with a second hand.
