Graeme Wall wrote:
On 16/07/2011 10:24, Guy Gorton wrote:
That seems very low. My facts may be wrong but I think 30ft of water
creates 1 atmosphere of pressure, which is about 14 lbs/sq.in.

If I remember my schoolboy physics, it's 32ft of water and 15lbs/sq.in.

32.2 & 14.4 rings a bell..