"桶槽容量" can be translated into English as "tank capacity" or "vat capacity", depending on the specific context and the type of container being referred to.
"Tank capacity" is commonly used when referring to the storage capacity of containers like fuel tanks, water tanks, or chemical storage tanks.
"Vat capacity" might be more appropriate when referring to large, industrial containers used for mixing, fermenting, or storing liquids, such as in brewing or winemaking.
In most general contexts, "tank capacity" would be a suitable and widely understood translation.