(a) The insulation for a cargo tank without a secondary barrier must be designed for the cargo tank at the design temperature, and for a vessel operating in:

1. (1) Any waters in the world, except Alaskan waters, for the ambient cold condition of:

   1. (i) Five knots air at −18 °C (0 °F); and
   2. (ii) Still sea water at 0 °C (32 °F); or

2. (2) Alaskan waters for the ambient cold condition of:

   1. (i) Five knots air at −29 °C (20 °F); and
   2. (ii) Still sea water at −2 °C (28 °F).

(e) Powder or granulated insulation must:

1. (1) Not compact from vibrations of the vessel;
2. (2) Maintain the thermal conductivity listed under § 154.467; and
3. (3) Not exert a static pressure greater than the external design pressure of the cargo tank under § 154.408.