§171.070. Subdivision requirements—Type II. — Inbound Citations

(b) Each vessel not described in paragraph (a) of this section must be shown by design calculations to comply with the requirements in §§ 171.070 to 171.073 for Type II subdivision.

(c) In the case of ships less than 180 feet (55 meters) in length, the Commanding Officer, Marine Safety Center may approve a further relaxation in the bulkhead spacing. However, in no case may the separation be large enough to prevent the vessel from complying with the flooding requirements for Type II subdivision in § 171.070.

When doing calculations to show compliance with § 171.070, the following uniform average permeabilities must be assumed:

(1) A and B must not exceed the maximum bulkhead spacing that permits compliance with § 171.070; and

(2) The Type II subdivision requirements in §§ 171.070, 171.072, and 171.073; and

(ii) The subdivision requirements of § 171.040, § 171.043, or § 171.070.

(b) In addition to regular passengers, for the purpose of complying with §§ 171.070 through 171.073 and § 171.080, the following will also be counted as passengers:

(2) Sections 171.070 through 171.073; and

(a) Each oceanographic vessel must comply with the subdivision requirements in §§ 171.070, 171.072, and 171.073 of this subchapter as if it were a passenger vessel carrying 400 or less passengers.

(2) The Type II subdivision requirements in §§ 171.070, 171.072, and 171.073 in subchapter S of this chapter; and

(2) The Type II subdivision requirements in §§ 171.070, 171.072, and 171.073 in subchapter S of this chapter; and

(a) Except as provided in paragraph (c) of this section, each vessel must comply with the Type II subdivision and damage stability requirements of §§ 171.070 through 171.073 and 171.080 of this chapter if it meets one or more of the following criteria:

(1) Is more than 19.8 meters (65 feet) in length;

(2) Carries more than 49 passengers;

(3) Is constructed of wood on or after March 11, 2001, and operates in cold water; or

(2) Meet either the standards for collision bulkheads in § 179.310 in this chapter or § 171.085 in subchapter S of this chapter, and the standards for subdivision in §§ 179.220 and 179.320 of this chapter, or the standards for subdivision and damaged stability in §§ 171.070 through 171.073 and 171.080 in subchapter S of this chapter, as appropriate, and be provided with life floats of an aggregate capacity that will accommodate at least 100% of the total number of persons permitted on board.

(2) Meet either the standards for collision bulkheads in § 179.310 of this chapter or § 171.085 in subchapter S of this chapter and the standards for subdivision in §§ 179.220 and 179.320 of this chapter, or the standards for subdivision and damaged stability in §§ 171.070 through 171.073 and 171.080 in subchapter S of this chapter, as appropriate, and be provided with life floats of an aggregate capacity that will accommodate at least 100% of the total number of persons permitted on board.

(2) Meet either the standards for collision bulkheads in § 179.310 of this chapter or § 171.085 in subchapter S of this chapter, and the standards for subdivision in §§ 179.220 and 179.320 of this chapter, or the standards for subdivision and damaged stability in §§ 171.070 through 171.073 and 171.080 in subchapter S of this chapter, as appropriate, and be provided with life floats of an aggregate capacity that will accommodate at least 100% of the total number of persons permitted on board.

(2) Meet either the standards for collision bulkheads in § 179.310 of this chapter or § 171.085 in subchapter S of this chapter, and the standards for subdivision in §§ 179.220 and 179.320 of this chapter, or the standards for subdivision and damaged stability in §§ 171.070 through 171.073 and 171.080 in subchapter S of this chapter, as appropriate, and be provided with life floats of an aggregate capacity that will accommodate at least 50% of the total number of persons permitted on board.

(2) Meet either the standards for collision bulkheads in § 179.310 of this chapter or § 171.085 in subchapter S of this chapter, and the standards for subdivision in §§ 179.220 and 179.320 of this chapter, or the standards for subdivision and damaged stability in §§ 171.070 through 171.073 and 171.080 in subchapter S of this chapter, as appropriate, and not be required to carry survival craft.

(a) Section 171.070(a) of this subchapter as a passenger vessel carrying 400 or less passengers;

(c) Except as allowed in § 171.070(c), each vessel must have a collision bulkhead.

(b) If foam is used to comply with § 171.070(d), § 171.095(c), or § 173.063(e) of this subchapter, the following applies:

(1) Foam may be installed only in void spaces that are free of ignition sources.

(2) The foam must comply with NPFC MIL-P-21929B (incorporated by reference; see 46 CFR 170.015), including the requirements for fire resistance.

(3) A submergence test must be conducted for a period of at least 7 days to demonstrate whether the foam has adequate strength to withstand a hydrostatic head equivalent to that which would be imposed if the vessel were submerged to its margin line.

(4) The effective buoyancy at the end of the submergence test must be used as the buoyancy credit; however, in no case will a credit greater than 55 lbs per cubic foot (881 kilograms per cubic meter) be allowed.

(5) The structure enclosing the foam must be strong enough to accommodate the buoyancy of the foam.

(6) Piping and cables must not pass through foamed spaces unless they are within piping and cable trunks accessible from both ends.

(7) Sample specimens must be prepared during installation and the density of the installed foam must be determined.

(8) Foam may be installed adjacent to fuel tanks if the boundary between the tank and space has double continuous fillet welds.

(10) The results of all tests and calculations must be submitted to the OCMI.

(i) Be used in each area that may be exposed to water; and

(2) C and D must not be less than the minimum spacing specified in § 171.070(e).

(b) Section 171.070(e) of this subchapter;