Method for making insulated pipe
US4581804A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1975 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | Sep 12, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53657
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An insulated pipe for conducting high and low temperature fluids includes a rigid carrier pipe, a layer of volumetrically compressible insulating material around the O.D. of the carrier pipe, and a protective outer pipe around the insulating layer. The method of making the pipe product includes placing a closed flexible bag around the carrier pipe and the insulating layer, and then drawing a vacuum on the interior of the bag to compress the insulating layer. The outer pipe is slid lengthwise over the compressed insulating layer, and the vacuum is then removed to allow the insulation to partially expand and fill the annulus between the carrier pipe and the outer pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.