Robbie wrote in 020227 MMDigest, commenting on metric units:

 [ So wind pressure 0.05 bar is 20 inches water gage, enough to
 [ blow the pipe from the chest (almost ;-)!

The Father Willis organ in the Royal Albert Hall, London (the largest
organ in the UK) has a Tuba on 30 inches water gage wind pressure.  The
treble pipes of this rank are fitted with leaf-springs to keep them
from blowing away.

Regards,
John Page