CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER F—MARINE ENGINEERING (parts 50 to 64) > PART 54—PRESSURE VESSELS > SUBPART 54.15—Pressure-Relief Devices (§54.15-1 to §54.15-25) > 54.15-3—Definitions (modifies Appendix 3).