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1. (WO1989000481) METHOD FOR THE REPAIR OF THE INSIDE OF INSTALLED CONDUITS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1989/000481 International Application No.: PCT/EP1988/000586
Publication Date: 26.01.1989 International Filing Date: 02.07.1988
IPC:
B05D 7/22 (2006.01) ,B24C 3/32 (2006.01) ,F16L 58/10 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
D
PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
7
Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
22
to internal surfaces, e.g. of tubes
B PERFORMING OPERATIONS; TRANSPORTING
24
GRINDING; POLISHING
C
ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
3
Abrasive blasting machines or devices; Plants
32
designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
58
Protection of pipes or pipe fittings against corrosion or incrustation
02
by means of internal or external coatings
04
Coatings characterised by the materials used
10
by rubber or plastics
Applicants:
INTERTECHNO AG [CH/CH]; Dorfstrasse 72 CH-8805 Richterswil, CH
Inventors:
NÄF, Werner; CH
Agent:
MASPOLI, R., A.; P.O. Box 191 Buchholzstrasse 149 CH-8053 Zurich, CH
Priority Data:
2604/8709.07.1987CH
346/8802.02.1988CH
Title (EN) METHOD FOR THE REPAIR OF THE INSIDE OF INSTALLED CONDUITS
(FR) PROCEDE POUR LA REPARATION DE L'INTERIEUR DE CONDUITES POSEES
Abstract:
(EN) The novel method for the repair of the inside of installed conduits comprises the following method steps: drying of the inside of the line by flow-through of pre-dried compressed air, removal of interior coatings by flow-through of a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of > 0.8 mm and a specific weight of > 3.0 g.cm-3 in an amount of > 1.0 g.Nm-3, the mixture flowing through the line with a mean speed of > 10 m.s-1, relative to normal pressure, and blowing out the line by means of pre-dried compressed air. The adhesive resin utilized for the subsequent coating contains, among others, a solvent-free 2-component resin and at least 5 % by weight of finely dispersed inorganic oxidic adhesives.
(FR) Le procédé décrit consiste à sécher l'intérieur de la conduite par circulation d'air comprimé pré-séché, à enlever les revêtements intérieurs par circulation d'un mélange d'air comprimé et de particules d'un milieu abrasif d'un diamètre extérieur moyen supérieur à 0,8 mm et d'une masse volumique supérieure à 3,0 g/cm-3 dans une quantité supérieure à 1,0 g/Nm-3, le mélange circulant à travers la canalisation avec une vitesse moyenne supérieure à 10m/s-1, par rapport à la pression normale, et, à procéder au soufflage de la canalisation au moyen d'air comprimé pré-séché. La résine adhésive utilisée pour le revêtement ultérieur renferme, entre autres, une résine à deux constituants exempte de solvants et au moins 5 % en poids d'adhésifs oxydiques inorganiques finement dispersés.
Designated States: AU, DK, FI, JP, NO, SU
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI891106NO19891003RU02052168AU1988019806