| 摘要 |
A working enclosure adapted to provide a clean air zone within a potentially hazard environment such as an oil storage tank, the enclosure comprising a canopy (10) supported by a frame (11) and having a skirt (12) to be held in close proximity with the tank wall by magnetic pads (13). The canopy (10) is supported in a vertical attitude by rigging ropes (14) and steady ropes (15). An operator may enter and leave the canopy via a sealed flap (16), and a supply of clean air from an fan (23) is supplied to the interior of the canopy by a duct (20). In the clean air zone created by the enclosure an operator on suspension lines (18) may carry out "hot work" on the tank wall while the supply of clean air is monitored, and an alarm sounded or the operation shut down automatically in the event of air contamination. |
