3.1 Where the Code requires that a particular fitting, material, appliance or apparatus, or type thereof, piece of equipment or machinery shall be fitted or carried in a vessel, or that any particular provision shall be made, the Administration may permit any other fitting, material, appliance or apparatus or type thereof, piece of equipment or machinery to be fitted or carried or other provision to be made in that vessel where it is satisfied by trials or otherwise that the alternative is at least as effective as that required by the Code.