In a “filled" compartment which is trimmed as required
by regulation VI/3(a), the above referenced
section states that the resulting grain surface after shifting shall
be assumed to be at an angle 15° to the horizontal. It is implicit
in this regulation that the void area above the trimmed surface will
be minimal as described by the average void depth (Vd) assumption
in part B, section I(A)(a). However,
when the compartment is filled but is exempted from trimming by regulation VI/3(c) because there is additional
filling, by means of feeding ducts or deck perforations, into the
void above grain surface at its natural angle of repose; there is
no implication as to the size of the remaining void. It may be greater
than or less than the standard void. If it is greater, this raises
the question as to whether the 15° shift should still be applied.
The regulations are silent on this point. The following guideline
pertains to this latter situation only.