Hydraulically efficient ribbed pipe
US4838317A · kind A · utility
Inventors
Key dates
| Filing date | Oct 21, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Oct 21, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/1018
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulically efficient metal pipe particularly adapted for use in storm drain and sanitary sewer applications which is adapted for use with a self-supporting interior inert protective lining. The pipe has a channeled wall defining a plurality of outwardly projecting structural ribs and a hydraulically smooth interior surface. The ribs are preferably of a helical configuration and the channels which are formed interiorly thereof are generally either square or rectangular in cross-section and are open along the interior surface of the pipe. The walls defining the ribs can be tapered inwardly to form triangular-shaped channels so as to define an anchor througout the length of the pipe for securing thereto a smooth interior lining of corrosion-resistant protective material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.