Joining lined pipe sections
US11047513B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 2016 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Nov 17, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L59/20
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In order to reduce or remove the potential risk of heat damage in the absence of cooling jackets when joining lined pipe sections, each lined pipe section is provided with an insulatory sleeve which is disposed between the host pipe and the respective liner. The sleeves provide discrete thermal protection to the ends of the liners and, where applicable, electrofusion welds between an electrofusion fitting and the liners. The sleeves are first located in the ends of the host pipes which are then lined by drawing the liners through the host pipes via a reduction die to reduce their external diameter. The liners are then reverted towards their original dimensions resulting in a tight fitting against the internal surface of the host pipes and of the insulatory sleeves thereby compressing the insulation material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.