|Caisson workers are also called
Compressed Air Workers. Most of their interventions are
inspection of Nuclear Power Plants (for 10 years
pressure/leak tests), digging tunnels under pressure or
inspection & repair under pressure the TBM
cutter heads, standard caisson works, and leak testing of
airplanes cabin upon delivery.
The concept of compressed air work must be extended to compressed gas works since mix gases breathing have been used in tunnelling operations since 2002.
JCLP HYPERBARIE used to take care of :
Since 1986, JCLP HYPERBARIE has been
involved with more than 75 tunnel construction sites with
operations in compressed air, for all French contractors
who have built tunnels with compressed air, and with most
of European and North American TBM manufacturers.
The range of pressures are
from 0.6 bar to 6.9 bar(g). The
more frequent pressure range is between 1.8 to 3
A full set of procedures has been developed and the corresponding equipment has been built to support Hallandsas Tunnels digging in Sweden where possible pressure may reach 13 bars. (2004). Ultimately not used...
Similar work has been performed with Traylor, then with Impregilo for the tunnel below lake mead in Nevada (USA) for 15 bars; Ultimately not used !
Calculation of all tables for Trimix bounce interventions and Saturation procedures for Hong Kong saturation 6 bars, with Hyperbarie Sarl (2015)
Special situation : Digging under compressed air in a kerosene contaminated soil (refer to publication).
Negotiation with authorities to obtain specific dispensations has been carried out in Australia, Hong Kong, Germany, Spain and Portugal
JCLP HYPERBARIE has also been the Consultant for the French Ministry of Labor for almost 10 years (1987/1996), he is a member of Working Groups in AFTES "Compressed air works" and for CEN (151 WG 4 : Safety Standard for TBM- air locks - EN 12100).