Method of producing multiple-wall composite pipes
US4332073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Feb 25, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4994
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An outer pipe is diametrically expanded by heating and an inner pipe is diametrically contracted by cooling with a coolant introduced into the inner pipe to produce between the pipes a clearance just sufficient for insertion of the inner pipe into the outer pipe, and then the coolant is pressurized to expand the inner pipe against and together with the outer pipe, the pressure being removed after the pipes have expanded to a specific diameter of the joint therebetween. The tightness of the fit between the pipes due to the expansion is further increased by the subsequent thermal shrinkage of the outer pipe and thermal expansion of the inner pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.