(Continued from vol. 1, page 1072) The cast-in-place (CIP) approach was adapted to a simplified process for repair of holes in polyethylene (PE) pipes. The approach involves clamping an elastomer-lined clamshell around the damage and, after the pressurized flow has been stopped, embedding the clamshell in a shell of PE. This work defines: 1. Design aspects of a low-profile steel clamp including examination of several elastomeric gasket materials. 2. Damage types that can be sealed including roughened and damaged surfaces. 3. Inexpensive and portable methods for strapping the clamp securely around large holes to seal leaking gas under substantial pressure. 4. Suitable lengths for the clamp and the PE shell that is molded around it. The overall approach works quite well and clamp designs were found that will seal leaking gas at pressures up to 770 kPa. The clamp is capable of taking flattened pipe and rounding it as it seals holes that are up to 8 cm long in 6 cm diameter SDR-11 gas pipe. Clamp lengths should be no more than 1/3 the length of the cast PE sleeve.


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    Title :

    Cast-in-place (CIP) for joining and repairing live, PE, gas lines - III. repair of holes


    Additional title:

    Vorortgießen für die Verbindung und Instandsetzung von in Betrieb stehenden Polyethylengasleitungen - III. Reparatur von Löchern


    Contributors:
    Grimm, R.A. (author) / Geoghegan, B. (author) / Eberle, A.C. (author)


    Publication date :

    2002


    Size :

    4 Seiten, 8 Bilder, 2 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






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