The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2001
Filed:
Nov. 12, 1993
Pipe with ribs on its inner surface forming a multiple thread and steam generator for using the pipe
Applicant:
Inventors:
Wolfgang Kastner, Herzogenaurach, DE;
Wolfgang Köhler, Kalchreuth, DE;
Eberhard Wittchow, Erlangen, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F28F 1/40 ;
U.S. Cl.
CPC ...
F28F 1/40 ;
Abstract
A pipe includes a pipe wall having an inner wall surface. Ribs are disposed on the inner wall surface forming a multiple thread. The ribs define a mean inside pipe diameter and the ribs have a lead which is equal to between 0.6 and 0.9 times the square root of the mean inside pipe diameter. Such pipes may be used in a fossil-fuel steam generator, a solar-heated steam generator, or a heated steam generator serving as a waste-heat steam generator, a heat exchanger or a steam generator for absorbing after-heat in a nuclear power plant.