Patent · US Expired

Lining a steel pipe internally with a cement mortar

US4390568A · kind A · utility

3Cited by

0References

8Claims

0Family size

Assignee

Mannesmannufer Aktiengesellschaft · DE

Inventors

Wilhelm Schwenk · Duisburg, DE
Bruno Heinrich · Duisburg, DE
Rolf Mangen · Mülheim, DE

Key dates

Filing date	Mar 17, 1981
Grant date	Jun 28, 1983
Priority date	—
Expiry date	Mar 17, 2001

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16L58/1036
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A dispersion of a polymer such as an acrylic resin, and of a surface-acting resin, such as a melamine resin, is added to a cement mortar having a sand-to-cement ratio of 1 to 3 and a water-to-cement ratio of 0.25 to 0.35, the resin being preferably approximately 10 parts by weight per 100 parts of cement. This blend is applied to the interior of a pipe and the pipe is rotated at a speed which is gradually increased in order to produce at least approximately 20-g forces on the material for compacting same for a few minutes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.