Cleaning and liquid contact with solids – Processes – Including use of vacuum – suction – or inert atmosphere
Patent
1990-06-08
1991-12-17
Morris, Theodore
Cleaning and liquid contact with solids
Processes
Including use of vacuum, suction, or inert atmosphere
134 221, 134 2212, 134 24, 981152, 454 49, B08B 504, B08B 900
Patent
active
050732048
ABSTRACT:
A hoarding assembly having a non-combustible innermost portion is sealed against the cladding of a hot surface, such as that of a large boiler, to create an envelope. Outside air may enter the otherwise airtight envelope through controlled inlets in the hoarding assembly. The boiler is insulated with a layer of asbestos that is to be replaced. A vertically extending first array of supply air inlets is provided in one end wall of the hoarding assembly and a vertically extending second array of suction outlets is provided in the other end wall. A fan assembly injects cool air through the first array and a negative air machine assembly withdraws air through the second array. The placement of the inlets and outlets results in a wall of air moving parallel to the boiler wall and having its centerline spaced from the cladding, typically about 1 to 3 feet from it. With the foregoing operating, the sheet metal cladding is removed from the boiler. A narrow vertical strip of the asbestos is then removed. Insulation or a ceramic fiber curtain is temporarily placed over each exposed strip of boiler wall, to contain the heat radiation. The asbestos is progressively removed in this fashion. A sealant is then sprayed on the bared cleaned wall. The system overcomes the problems inherent in removing asbestos from a potent source of radiant heat, without shutting the boiler down.
REFERENCES:
patent: 4351863 (1982-09-01), Roesner
patent: 4774974 (1988-10-01), Teter
patent: 4872920 (1989-10-01), Flynn et al.
Chaudhry Saeed
Fuller Austin Insulation Inc.
Morris Theodore
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