Hi Jay.
If section 18 applies to diesel, it would have to be a Class 1 location as per 18-004 (a)---"Class 1 locations are those in which flammable gases or vapours are or may be present in the air in quantities sufficient to produce explosive gas atmospheres"
So I guess the question is whether diesel produces flammable gases "in quantities sufficient to produce explosive gas atmospheres".
Looking at the table in appendix B (18-066), I see that diesel is not listed. However, looking at fuel oil #2 msds sheets (section 5), it would appear that diesel does indeed give off explosive vapours.
I would think that 18-006-(c)-(ii) would apply, as you have "flammable volatile liquids...normally confined within closed containers...can escape only as a result of accidental rupture or breakdown..."
Just my $0.02
Shawn.
