General.

  1. Law
  2. CFR 46
  3. Shipping
  4. Coast Guard, Department of Homeland Security
  5. Certain Bulk Dangerous Cargoes
  6. Safety Standards for Self-Propelled Vessels Carrying Bulk Liquefied Gases
  7. Design, Construction and Equipment
  8. Secondary Barrier
  9. General.

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§ 154.459 General.

(a) Each cargo tank must have a secondary barrier that meets Table 3 and except as allowed in Table 3, the hull must not be the secondary barrier.

(b) If the Commandant (CG-ENG) specially approves an integral tank for a design temperature at atmospheric pressure lower than −10 °C (14 °F), the integral tank must have a complete secondary barrier that meets § 154.460.

(c) If the Commandant (CG-ENG) specially approves a semi-membrane tank under the requirements of an independent tank type B, the semi-membrane tank may have a partial secondary barrier specially approved by the Commandant (CG-ENG).

(d) If Table 3 allows the hull to be a secondary barrier, the vessel's hull must:

(1) Meet §§ 154.605 through 154.630; and

(2) Be designed for the stresses resulting from the design temperature.

Expand Table

Table 3 - Secondary Barriers for Tanks

Tank type Cargo temperature (T) at atmospheric pressure
T≥−10 °C (14 °F) T<-10 °C (14 °F)≥55 °C (−67 °F) T<−55 °C (−67 °F)
Integral No secondary barrier required Tank type not usually allowed1 Tank type not allowed.
Membrane ......do Complete secondary barrier1 Complete secondary barrier.
Semi-membrane ......do ......do Do.
Independent:
Type A ......do ......do Do.
Type B ......do Partial secondary barrier1 Partial secondary barrier.
Type C ......do No secondary barrier required No secondary barrier required.

1 The hull may be a secondary barrier.

(14 U.S.C. 632; 46 U.S.C. 369, 375, and 416; 49 U.S.C. 1655(b); 49 CFR 1.46(b))

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983]


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