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To determine the propane gallon capacity of an ASME tank, you need to know the tank's water capacity and the specific gravity of propane compared to water. The water capacity of the tank is given as 28.6 gallons and it's crucial to remember that ASME tanks are designed to operate at a specific fill level, which is typically about 80% of their total capacity for safety reasons.

Propane has a specific gravity of around 0.493, which is taken into account to convert from the tank's water capacity to its equivalent propane capacity. The formula used to calculate the gallon capacity of propane from the water capacity is:

Propane capacity = Water capacity x specific gravity x fill factor

Using the numbers provided:

- The water capacity is 28.6 gallons.

- Assuming we fill the tank up to 80% of its water capacity, the effective water capacity becomes 22.88 gallons (28.6 gallons x 0.8).

- Considering the specific gravity of propane, the propane capacity calculation would be approximately 22.88 gallons x 0.493.

When you do the math, you get around 11.29 gallons of propane. However, the question is asking about the entire tank, and typically propane