On Wed, 23 Jun 2010 13:50:07 -0700, Winston
wrote:

On 6/23/2010 12:21 PM, Pete C. wrote:

Don Foreman wrote:

(...)

What happens with a 5 gallon jerrycan with 1.5 PSIG inside? Well, the
vapor pressure of "summer" gasoline varies about 3.5 PSI from 50F to
90F, so a jerrycan certainly can handle 3.5 PSIG without problem.

A 20 l jerrycan has about 10% the internal surface area of a 55 ggl drum.

The flat top & bottom of a 55 gal drum have areas of about 380 in^2.
The 13" x 18.5" flat sides of a jerrycan are 240 in^2. The
cylindrical part of a 55 gal drum could probably stand upwards of 100
PSIG, it's the flat surfaces and seams that dictate.