CFR > Title 33 - Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER NN—DEEPWATER PORTS (parts 148 to 150) > PART 149—DEEPWATER PORTS: DESIGN, CONSTRUCTION, AND EQUIPMENT > SUBPART B—Pollution Prevention Equipment (§149.100 to §149.145) > 149.105—What are the requirements for the overflow and relief valves?

149.105—What are the requirements for the overflow and relief valves?

(a) Each oil and natural gas transfer system (OTS/NGTS) must include a relief valve that, when activated, prevents pressure on any component of the OTS/NGTS from exceeding its maximum rated pressure.
(b) The transfer system overflow or relief valve must not allow a discharge into the sea.