flash & fire point of a given fuel

Summary

This video demonstrates how to determine the flash point and fire point of a liquid fuel using the Pensky-Martens apparatus. It provides a step-by-step guide, including the setup of the apparatus, preparation of the fuel sample, insertion of the thermocouple, and proper use of the stirrer and test flame. The process explains how to identify the flash point, where vapors ignite momentarily, and the fire point, where ignition is sustained. Using diesel as an example, the flash point was recorded at 88.4°C and the fire point at 133.4°C. Clear instructions and safety measures are emphasized throughout the experiment.

Takeaways

• 😀 The video explains how to determine the flash point and fire point of a given liquid fuel using the Penske-Martin apparatus.
• 😀 The experiment aims to determine the flash point and fire point of a liquid fuel sample.
• 😀 The required apparatus for this experiment includes the Penske-Martin apparatus.
• 😀 The Penske-Martin apparatus consists of a temperature display panel, stirrer, thermocouple, lid and shutter mechanism, sterler blade, oil cup, and heater.
• 😀 To begin, the oil cup is filled up to the mark with the liquid fuel sample, such as diesel.
• 😀 The oil cup is placed in the heater, and the cotton wick is arranged into the flame burner.
• 😀 The oil cup is closed with the lid and shutter mechanism, and the thermocouple is inserted to measure the fuel's temperature.
• 😀 The test flame burner is ignited, and the power supply is switched on to start the experiment.
• 😀 The stirrer is switched on to maintain a steady state temperature and stir the oil uniformly.
• 😀 Flash point determination: The test flame is applied at 1-degree intervals until flash is observed. The lowest temperature where the vapor ignites is the flash point.
• 😀 The flash point for the given fuel (diesel) is 88.4 degrees Celsius, and the fire point is 133.4 degrees Celsius.

Q & A

What is the main objective of the experiment described in the video?

The main objective is to determine the flash point and fire point of a given liquid fuel using the Pensky-Martens apparatus.

Which apparatus is used to determine the flash point and fire point of the fuel?

The experiment uses the Pensky-Martens apparatus.

What is the function of the thermocouple in this experiment?

The thermocouple is used to accurately measure the temperature of the fuel during heating.

How is the oil cup prepared and positioned in the apparatus?

The oil cup is filled up to the marked level with the fuel sample, placed properly on the heater, and closed with the lid and shutter mechanism.

What is the role of the stirrer in this experiment?

The stirrer ensures uniform heating of the fuel by continuously mixing it, maintaining a steady temperature within the oil cup.

At what point should the test flame be applied during the experiment?

The test flame should be applied when the fuel temperature is approximately 70–17°C below the expected flash point, and then at regular intervals of 1°C until ignition is observed.

How is the flash point defined in this experiment?

The flash point is the lowest temperature at which the application of a test flame causes the vapor above the fuel to ignite momentarily.

How is the fire point defined and determined?

The fire point is the temperature at which the fuel vapor ignites and continues to burn for at least 5 seconds. It is determined by continuing to apply the test flame at intervals of 3 seconds as the temperature increases.

What were the recorded flash point and fire point for diesel in the experiment?

The flash point was recorded at 88.4°C, and the fire point was recorded at 133.4°C.

Why is it important to use the shutter mechanism while applying the test flame?

The shutter mechanism allows controlled application of the flame, ensuring safety and precise observation of ignition without direct exposure to the fuel vapor.