Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DOUBLE HEAT TRANSFER TUBE AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPH06257986
Kind Code:
A
Abstract:

PURPOSE: To improve heat transfer performance by a method wherein a ceramic coating layer, having a plurality of detecting flow passages of cracked condition, is provided integrally between an outer tube and an inner tube, in a heat transfer tube consisting of the outer tube and the inner tube combined concentrically in double layers under the condition of contacting closely.

CONSTITUTION: A ceramics coating layer 3, having a plurality of detecting flow passages of the condition of axial cracks, is provided integrally between an outer tube 1 and an inner tube 2, in a heat transfer tube, provided with the inner tube 2 and outer tube 1 concentrically and provided with an annular gap for detecting leakage between both tubes 2, 1 while being used for a large- size steam generator, heat exchanger and the like. The cracks provided on the ceramics coating layer 3 are formed by a method wherein pressure fluid is forced into the inner tube 2 to expand the inner tube 2 together with the outer tube 1 and the ceramics coating layer 3 outwardly whereby the cracks, divided circumferentially and generated in a direction along the axis of the tube, are formed. According to this method, effective leakage detecting flow passages can be obtained while securing prominent heat transfer performance.


Inventors:
UMEMOTO TADAHIRO
KOMATA IPPEI
Application Number:
JP4414893A
Publication Date:
September 16, 1994
Filing Date:
March 04, 1993
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ISHIKAWAJIMA HARIMA HEAVY IND
International Classes:
B21D31/00; C23C14/06; F16L9/14; F28F11/00; (IPC1-7): F28F11/00; B21D31/00; C23C14/06; F16L9/14
Attorney, Agent or Firm:
Masatake Shiga (2 outside)