Apparatus for heating localized areas of pipe

Claim 2

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a plurality of substantially tangentially discharging burners carried by said sections and arranged to discharge flame into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by a pair of such sections, each of semi-annular form, separated upon a substantially vertical diametric axial plane, the sections being hinged together at the top and separable at the bottom, and grappling means for imposing a lifting force on each of saiD sections at positions on opposite sides of the hinged position whereby the sections may be supported in the open condition.

Claim 3

Heating means as defined in claim 1 including means for lifting and for controlling the opening and closing movement of said sections comprising combined lifting and abutment ears carried at the top of said sections, and sling means engageable with said ears for lifting and opening the same.

Claim 4

Heating means as defined in claim 1 including cable retaining means carried by said sections at positions uniformly angularly spaced from the hinge axis whereby the sections may be simultaneously lifted and opened.

Claim 5

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a plurality of substantially tangentially discharging burners carried by said sections and arranged to discharge flame into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by burners which are offset angularly from one another and which discharge toward one another in opposite angular directions, said burners being axially displaced so that the discharges of said burners may pass each other in axially displaced regions.

Claim 6

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a plurality of substantially tangentially discharging burners carried by said sections and arranged to discharge flame into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by burners which are offset angularly from one another and which discharge toward one another in opposite angular directions, said burners being axially displaced so that the discharges of said burners may pass each other in axially displaced regions.

Claim 7

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a pair of substantially tangentially discharging axially offset burners carried by said sections and arranged to discharge flame in opposite angular directions into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by a pair of burners offset axially from each other and discharging in opposite angular directions.

Claim 8

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a pair of substantially tangentially discharging axially offset burners carried by said sections and arranged to discharge flame in opposite angular directions into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by a pair of burners offset axially from each other and discharging in opposite angular directions.

Claim 9

Heating means as defined in claim 5 including wall portions spaced from the axial ends of said sections for guiding the discharges of said burners past each other.

Claim 10

Heating means as defined in claim 4 including wall portions spaced from the axial ends of said sections for isolating the discharges of said burners in the passing regions.

Claim 11

Heating means as defined in claim 5 wherein said burners are offset axially and angularly from one another and discharge toward one another in opposite angular directions whereby the discharges thereof may pass one another in axially offset paths.

Claim 12

Heating means as defined in claim 5 wherein said burners are offset angularly from one another and discharge toward one another in opposite angular directions, said directions being axially displaced so that the discharges of said burners may pass each other in axially displaced regions, and controllable escape openings in the side walls of side combustion chambers located close to said restricted areas of communication.

Claim 13

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a plurality of substantially tangentially discharging burners carried by said sections and arranged to discharge flame into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by burners arranged at angularly spaced positions in said sections and discharging in the same angular direction into the interior thereof and means dividing said sections into a plurality of angularly spaced combustion areas communicating with each other through relatively restricted passages located at the inner periphery thereof, each of said sections having controllable lateral vents located relatively close to said passages.

Claim 14

Means for heating localized peripheral area of pipe or the like, comprising a plurality of complemental annular segmental inwardly opening box-like sections proportioned to closely surround the pipe, and a plurality of substantially tangentially discharging burners carried by said sections and arranged to discharge flame into the interior thereof, said sections having walls for guiding the flame and products of combustion around and close to the periphery of such a pipe, characterized by burners arranged at angularly spaced positions in said sections and discharging in the same angular direction into the interior thereof and means dividing said sections into a plurality of angularly spaced combustion areas communicating with each other through relatively restricted passages located at the inner periphery thereof, each of said sections having controllable lateral vents located relatively close to said passages.

Claim 15

Heating means as defined in claim 1 wherein eaCh of said sections incorporates at least one of said vents on each axial side, and a separate damper for controlling each vent.