Lining material for pipe lines and a process for providing pipe lines therewith
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United States of America Patent
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-
Apr 2, 1996
Issued Date -
N/A
app pub date -
Apr 8, 1994
filing date -
Jun 24, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lining material for pipe lines, especially those buried in the ground such as sewage pipe lines, and a process for providing such pipe lines therewith, includes a flexible tubular film, a resin-impregnated sheet covering the outer surface of the flexible tubular film, and a tubular covering material having a strong resistance to tensile force. The sheet may be constructed by several units of sheet fractions which are overlapped in both lateral end portions so as to be slidable over each other in opposite directions to form a tubular sheet. The lining material is applicable for repair and/or reinforcement to the inner surface of a pipe line having damaged portions. According to the process for providing pipe lines with this lining material, thermocuring of the lining material applied onto the inner surface of a pipe line can be carried out by moving a nozzle for jetting pressurized steam from one end to the other end of the pipe line without applying high pressure to the pipe line. Thus, this process is particularly suited for applying a lining material to a superannuated sewage pipe line or general sewage pipe lines having damaged portions.
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