B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/62, 154/53.0
B32B 5/18 (2006.01) B05D 1/34 (2006.01) B29C 44/32 (2006.01) F16L 59/02 (2006.01) F16L 59/04 (2006.01) F16L 59/10 (2006.01) F16L 59/14 (2006.01) F16L 59/20 (2006.01)
Patent
CA 1084352
ABSTRACT A method of applying foamed insulation to pipe in contemplated by the present invention. The pipe is moved longitudinally while being rotated about its longitudinal axis. A sprayable, foamable liquid is directed onto the surface of the pipe from a stationary location and is allowed to partially rise before a protective outer jacket is wrapped around the rising foam. The wrapping step includes application of sufficient pressure to the foam to increase the final density thereof, at the outer surface, by from 10% to 25% above the density if the foam was allowed to rise uninhibited. The invention also contemplates a method of marking the line of juncture between two lengths of pipe which have been coupled together for coating purposes. A marking liquid characterized by undergoing vaporization at a temperature below the maximum temperature reached during the exothermic reaction occurring between the foamable liquid and its blowing agent is applied to the pipe in conjunction with application of the foamable liquid. The foamable liquid is allowed to rise and the area in contact with the marking liquid will rise to a greater degree than the remaining liquid as a result of vapor- ization of the marking liquid during formation of the foam. This provides a ring of larger diameter foam in the location of the line of juncture. The invention further includes a method and apparatus for handling pipe coated with foam insulation wherein an inflatable member having a casing formed from yieldable rubber- like material and presenting a rounded surface is used to support the coated but not fully cured foam insulated pipe. The inflatable member is adapted to be inflated to a pressure sufficient to support at least a portion of the weight of the length of pipe without damaging the roam insulation or outer coating. A series of the inflatable members may be positioned to receive the pipe as it comes off of the coating line with the first inflatable members which contact the pipe being inflates to a lower pressure than the subsequent inflatable members which contact the pipe.
280723
Henderson Stewart
Hielema Ralph
Barrigar & Moss
Ckr Inc.
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