Patent ID: 9273805
Filing Date: 2016-03-01
CPC Classification: C10G,F16L,G06F,Y10T

Claim Text:
1. A transfer line from an olefins cracking furnace to a quench exchanger said transfer line having an internal flow passage having a continuously smooth and differentiable perimeter which does not include abrupt, sharp changes of internal section (steps), and centerline and a smoothly increasing cross-section in the direction of flow such that the angle between the transverse normal vector and the pipe walls range from 3° to 10° such that in the 5% of the flow passage from the inlet and the outlet the ratio of the aspect ratio (AR) divided by the isoperimetric quotient (Q) (ARQ) is from 1.0 to 1.02 and over the remaining 90% of the length of the flow passage not less than 5% of the flow passage has an ARQ is from 1.02 to 1.15.