Motorized crawler for gas main
US4252152A · kind A · utility
Inventors
Key dates
| Filing date | Aug 14, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Aug 14, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/26
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electrically powered pipeline crawler for use in conducting an insertion of a smaller-diameter, high-pressure gas main section into a section of lower-pressure, larger-diameter gas main. The pipeline crawler is sealed, so that it can be used to conduct insertion procedures in live gas main sections. Thus, service to customers along a main section upon which such an insertion is being conducted need not be interrupted. The pipeline crawler provides the added flexibility of permitting an insertion to be conducted on a several city block long section, without having to divide the several block long section into smaller sections of one to three blocks in length. Fewer access holes to the main need be dug, so there is less traffic disruption and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.