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Short Answer: Pressure levels in underground propane tanks are affected by factors such as temperature changes, tank size, depth, and fill rate, as well as the specific properties of the propane and tank design.
Environmental Factors
Temperature changes are a critical factor in underground propane tank pressure levels. As the temperature increases or decreases, the propane expands or contracts, causing pressure fluctuations. For every 1°C change in temperature, the pressure in the tank can change by approximately 0.7-1.1 kPa (0.1-0.16 psi). To mitigate this, tanks are designed with a certain expansion volume to accommodate temperature changes.
Tank Design and Size
The size and design of the tank also impact pressure levels. A larger tank with a higher volume-to-surface-area ratio can reduce pressure fluctuations due to temperature changes. Conversely, smaller tanks with a lower volume-to-surface-area ratio may experience greater pressure fluctuations. Additionally, tanks with thicker walls or those designed with specific pressure-relief valves can help manage pressure levels.
Fill Rate and Propane Properties
The fill rate of propane into the tank also affects pressure levels. Rapid fill rates can cause pressure spikes, while slower fill rates can help to minimize pressure fluctuations. The properties of the propane itself, such as its vapor pressure and specific gravity, can also impact pressure levels. Higher vapor pressures or lower specific gravities can result in greater pressure fluctuations, while lower vapor pressures or higher specific gravities can help to reduce pressure fluctuations.
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