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Filling station accessories - Thermodensimeter

Thermodensimeter - portable device for measuring vapour pressure and propane-butane density.

With this device you can measure vapour pressure and and liquid propane-butane specific gravity with one temperature-pressure-density reading.

thermodensimeter - enlarge photo »

Thermodensimeter diagram:

1. thermodensimeter cylinder

2. top plate

3. bottom plate

4. aerometer

5. liquid input line

6. 1/4" ball valve

7. safety valve

8. manometer

How to collect liquid propane-butane samples for analysis

1. Close valves A, B and C.

2. Connect the gun of the tank lorry or dispenser to the ends of the hose and open the angle valve.

3. Open valve A.

4. Slowly fill in the cylinder to a level where the aerometer can move freely and then slowly open valve C to let out the air and get the required level of liquid propane-butane.

5. Close all valves to check that there is no leakage.

6. Wait for a few minutes for all the readings to settle.

How to analyse readings

1. How to determine mixture composition using density and temperature readings

Get the density reading from the aerometer and the temperature reading from the thermometer. The density observed at the test temperature should be recalculated into the corresponding density at 15.6°C using data from the table. Get the corresponding percentage propane-butane composition from the table.

2. How to determine propane-butane composition using vapour density readings

Get the temperature reading from the thermometer of the aerometer and the pressure reading from its manometer. Use those two readings (temperature and pressure) to get the average composition of the examined propane-butane sample) from the diagram.

NOTE: After the test is completed remove the propane-butane from the device! (valves B and C)

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