Measurement and Testing
New cloud point option for diesel fuel analysis
Feb 20 2018 Read 842 Times
Cloud point is the temperature at which wax crystals are first observed in the liquid sample upon cooling under prescribed conditions. It is an important physical property for estimating diesel fuel performance under cold temperatures since wax formation can cause flow performance issues such as fuel filter clogging.
The ASTM D975, Specification for Diesel Fuels, specifies the manual cloud point testing method D2500 as the referee method. Although the manual method maintains its significance from its history and its position as the referee method, it is a heavily time/labour consuming test, and the judgement of the cloud point is highly dependent on the operator’s skill which often times can result in poor precision and accuracy.
In the latest version (D975-17a), the ASTM committee has approved the addition of D7683 Standard Test Method for Cloud Point of Petroleum Products (Small Test Jar Method) as an alternative to the manual method.
Tanaka Scientific’s MPC models which automatically run cloud point tests according to D7683 offers simple and precise measurements. Compared to the manual method, testing time is reduced by more than 50%, and sample volume by 90%. Pour point can also be measured simultaneously according to ASTM D6749 on the same sample.
Precision is significantly improved due to automation. Furthermore, the MPC models allow for 1 °C test intervals for pour point and 0.1 °C intervals for cloud point which helps the user achieve even more precise results. Model MPC-102S uses advanced refrigerant-free cooling technology without the need for connection to an external refrigerated chiller which saves lab space and eliminates maintenance of refrigerant and coolant.
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