### Question
How is the term product tank vessel defined?


### Answer
The term **product tank vessel** is defined in *46 U.S.C. § 53101* as the following:

> a double hulled tank vessel capable of carrying simultaneously more than 2 separated grades of refined petroleum products

#### Citation:
  - *46 U.S.C. § 53101*
  - Heading: **Subtitle V-Merchant Marine > CHAPTER 531-MARITIME SECURITY FLEET**

