Permaline, the process which utilises the inversion of an uncured flexible plastic liner into a failing sewer, inflating it with water until the plastic material matches the pipe and then curing the plastic to a hard shell is examined in detail. Existing access points can be used to insert continuous lengths of over 200 M with a minimal loss in cross-sectional area. Flow characteristics can be improved by the smooth surface finish and side connections can be cut out on non-man entry sizes by a remotely controlled cutter. Examples are given to illustrate the use of the process to solve the problem of mortar erosion in a brick sewer and hinge cracks in a clayware pipe. In the first case, the existing structure is reinstated to its original strength as all missing mortar and voids are filled with grout and the original fabric is protected by the lining. A cross sectional area of two percent less than the original is expected. Provided the cracked pipe had not become grossly deformed the lining prevents any further degradation from infiltration and increases the structural capacity of the pipe considerably. (TRRL)

  • Availability:
  • Corporate Authors:

    Specialist and Professional Press

    Surrey House, 1 Throwley Way
    Sutton, Surrey SM1 4QQ,   England 
  • Authors:
    • Greasley, K
  • Publication Date: 1984-2

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 12
  • Serial:
    • Volume: 163
    • Issue Number: 4779
    • Publisher: Hemming Group, Limited
    • ISSN: 0039-6303

Subject/Index Terms

Filing Info

  • Accession Number: 00387231
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 30 1984 12:00AM