Fremgangsmåte og anordning for bruk ved utförelse av arbeider på generelt vertikalt anordnede overflater

For coating the exterior 18 of a ship hull while the ship 10 is in drydock or afloat, creating a sizable chamber 44 with comprehensive staging access for all required work, sealing off that chamber at 158, 198, 200, 202, 203 to contain environmentally unacceptable byproducts of the coating process, to keep storm water runoff from passing through spent abrasive and paint overspray on the deck of the drydock or barge and to keep out weather conditions which could delay and deteriorate the quality of this coating process, ventilating and evacuating the chamber 44 using equipment 162, 164, 166, 168, 170, 172, 174, for maintaining an atmosphere inside the chamber which is conducive to worker safety and high coating quality and maintaining an atmosphere outside the chamber which is conducive to meeting requirements for the clean air and clean water laws and regulations, and at the same time reducing the overall cost of coating.