For ASME LP-GAS storage tanks with a water capacity of 125 gallons or greater, what maximum percentage of water capacity may they be filled to when transported on a public roadway?

For ASME LP-GAS storage tanks with a water capacity of 125 gallons or greater, what maximum percentage of water capacity may they be filled to when transported on a public roadway?

• A. 3%
• B. 5%
• C. 7%
• D. 10%

Answer: (B)

Transport safety requires leaving a vapor space in LPG storage tanks to accommodate thermal expansion and movement during travel. For ASME LP-GAS storage tanks with water capacity of 125 gallons or greater, the maximum fill is five percent of the tank’s water capacity. That means a tank with 125 gallons capacity can contain up to about 6.25 gallons of liquid propane, with the rest as vapor. This small headspace helps prevent overpressure, allows for safe venting if temperatures rise, and reduces risks from liquid surge or shifting during transport. Different tank sizes have different limits, but the five percent rule applies to these larger tanks.

Transport safety requires leaving a vapor space in LPG storage tanks to accommodate thermal expansion and movement during travel. For ASME LP-GAS storage tanks with water capacity of 125 gallons or greater, the maximum fill is five percent of the tank’s water capacity. That means a tank with 125 gallons capacity can contain up to about 6.25 gallons of liquid propane, with the rest as vapor. This small headspace helps prevent overpressure, allows for safe venting if temperatures rise, and reduces risks from liquid surge or shifting during transport. Different tank sizes have different limits, but the five percent rule applies to these larger tanks.