EP 0052522 A2 19820526 - An enhanced surface tube.
Title (en)
An enhanced surface tube.
Title (de)
Rohr mit vergrösserter Oberfläche.
Title (fr)
Tube à surface augmentée.
Publication
Application
Priority
NZ 19558980 A 19801119
Abstract (en)
An enhanced surface tube is made up of at least two conduits with the inner conduit (2) being stainless steel and with a spiral groove (4) extending in from the outer surface of the twin wall tube and forming a radially inwardly extending spiral protuberance (5) on the inner surface of the stainless steel conduit thus interconnecting the two conduits so that in use they will act as a single enhanced surface tube.
IPC 1-7
IPC 8 full level
F28F 21/08 (2006.01); F25B 39/00 (2006.01); F28D 7/02 (2006.01); F28F 1/00 (2006.01); F28F 1/42 (2006.01)
CPC (source: EP)
F28D 7/026 (2013.01); F28F 1/003 (2013.01); F28F 1/42 (2013.01); F28F 1/426 (2013.01); F28F 21/083 (2013.01)
Designated contracting state (EPC)
AT BE DE FR GB NL SE
DOCDB simple family (publication)
EP 0052522 A2 19820526; EP 0052522 A3 19821124; AU 7757581 A 19820527; JP S57155097 A 19820925; NZ 195589 A 19851011
DOCDB simple family (application)
EP 81305446 A 19811118; AU 7757581 A 19811117; JP 18452581 A 19811119; NZ 19558981 A 19811119