{"data":{"id":"us/46-cfr-171.067","jurisdiction":"us","citation":"46 CFR 171.067","heading":"Treatment of stepped and recessed bulkheads in Type I subdivision.","body":"(a) For the purpose of this section—\n(1) The main transverse watertight bulkhead immediately forward of a stepped bulkhead is referred to as bulkhead 1; and\n(2) The main transverse watertight bulkhead immediately aft of the stepped bulkhead is referred to as bulkhead 3.\n(b) If a main transverse watertight bulkhead is stepped, it and bulkheads 1 and 3 must meet one of the following conditions:\n(1) The separation between bulkheads 1 and 3 must not exceed the following:\n(i) If the factor of subdivision (FS) determined from § 171.065 (a) or (b) is greater than 0.9, the distance between bulkheads 1 and 3 must not exceed the maximum separation calculated to demonstrate compliance with § 171.065.\n(ii) If the factor of subdivision is 0.9 or less, the distance between bulkheads 1 and 3 must not exceed 90% of the floodable length or twice the maximum bulkhead separation calculated to demonstrate compliance with § 171.065, whichever is smaller.\n(2) Additional watertight bulkheads must be located as shown in Figure 171.067(a) so that distances A, B, C, and D, illustrated in Figure 171.067(a), satisfy the following:\n(i) Distances A and B must not exceed the maximum spacing allowed by § 171.065.\n(ii) Distances C and D must not be less than the minimum separation prescribed by § 171.065(e).\n(3) The distance A, illustrated in Figure 171.067(b), must not exceed the maximum length determined in § 171.065 corresponding to a margin line taken 3 inches (7.6 cm) below the step.\n(c) A main transverse bulkhead may not be recessed unless all parts of the recess are inboard from the shell of the vessel a distance A as illustrated in Figure 171.067(c).\n(d) Any part of a recess that lies outside the limits defined in paragraph (c) of this section must be treated as a step in accordance with paragraph (b) of this section.\n(e) The distance between a main transverse watertight bulkhead and the transverse plane passing through the nearest portion of a recessed bulkhead must be greater than the minimum separation specified by § 171.065(e).\n(f) If a main transverse bulkhead is stepped or recessed, equivalent plane bulkheads must be used in the calculations required to demonstrate compliance with § 171.065.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER S—SUBDIVISION AND STABILITY","PART 171—SPECIAL RULES PERTAINING TO VESSELS CARRYING PASSENGERS","Subpart C—Subdivision and Damage Stability"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"450ab1e0d47dd65b5ec52d286704be82a8bfd37bb9f729e5904f425dcfef0440","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-171.066","next":"us/46-cfr-171.068"},"notice":"GroundRules: Original legal text. Not legal advice."}