HEAT TRANSFER INTENSIFYING PIPE, CRACKING FURNACE AND ATMOSPHERIC-VACUUM HEATING FURNACE COMPRISING SAID PIPE Russian patent published in 2021 - IPC F28F1/40 

FIELD: heat exchange.

SUBSTANCE: invention relates to the field of heat transfer by means of a fluid medium and discloses a heat transfer intensifying pipe, as well as a cracking furnace and an atmospheric-vacuum heating furnace comprising said pipe. A heat transfer intensifying pipe (1) containing a tubular pipe body (10) with an inlet (100) for introduction of a fluid medium and an outlet (101) for removal of said fluid medium, wherein the inner wall of the pipe body (10) is connected by welding in the welding area with a rib (11) protruding into the pipe body (10), wherein the rib (11) has one or several rib sections extending spirally in the axial direction of the pipe body (10), each rib section has a first end surface facing the inlet (100) and a second end surface facing the outlet (101), and at least one of the first end surface and the second end surface of at least one of the rib sections is therein formed as a transitional surface along the spirally extending direction to reduce the stress of the rib (11) at the welding site during operation.

EFFECT: technical result is an increase in the operational life of the heat transfer intensifying pipe due to the reduction in the thermal stress of the rib (11) at the welding site during operation.

20 cl, 28 dwg, 4 tbl