NDTnet - May 1996, Vol.1 No.05

New advantages for quality control of Plastic Gas Pipes with an Ultrasonic Flaw Detection Rotation Machine

Author Rolf Diederichs

Please read the disclaimer


The article describes the need for in-line automated ultrasonic flaw detection for gas plastic pipes. There are economically feasible solutions available, even for inexpensive plastic pipe production sites, and safety expenditures pay off in the long run. This article describes a possible design and gives recommendations for buyers as well as suppliers' sites, and serves as a general introduction on how to find a specific ultrasonic test procedure. The system is based on Ultrasonic testing with a rotary head and is available and on the market.


  • Introduction

  • Finding the specific ultrasonic test procedure

  • Ultrasonic flaw detection system

  • Conclusions


    1. Ultrasonic for Plastic Pipe Extrusions, a Guide Book by Rolf Diederichs
    2. Ultrasonic for Plastic Pipe Extrusions, Chapt. Sound velocity calibration
    3. Ultrasonic for Plastic Pipe Extrusions, Chapt. Measurement position
    4. Ultraschall-Technik zur Produktionsoptimierung für die Rohrextrusion geworden. (Ultrasonic is today an advantage for the Pipe Extrusions.)
      Konferenz-Einzelbericht: Praxis der Qualitätssicherung in der Extrusion, SKZ-Fachtagung, Süddeutsches Kunststoff-Zentrum, Würzburg, D, 15.-16. Jun, 1994, (1994) Seite 135-160 (26 Seiten, 9 Bilder, 2 Tabellen).
      Institution: INOEX, Bad Oeynhausen, D.
    5. J.Krautkrämer H.Krautkrämer: Werkstoffprüfung mit Ultraschall, 1980, ISBN 3-540-10106-3 Springer Verlag. Engl. Ausg. "Ultrasonic testing of materials" ISBN 0-387-10106-3 Springer Verlag.

      Further Literature
    6. Rolf Diederichs: Ultraschall-Wanddickenmessung bei Rohren, zum Seminar "On Line Prozeßüberwachung bei der Rohrextrusion", SKZ Süddeutsches Kunststoff Zentrum Würzburg, 5. Nov 1991.
    7. Rolf Diederichs: Ultraschall zur Dicken- und Dimensionsmessung, zum Seminar "Automatisierung in der Rohrextrusion", SKZ Süddeutsches Kunststoff Zentrum Würzburg, 7.Okt 1992.
    8. Ernst Krüger, Rolf Diederichs, Reinhard Klose: Das Wie und Wo von Ultraschall bei der Automatisierung, Zeitschrift Plastverarbeiter 1992 Nr.8, Seiten 37 - 43.
    9. Rolf Diederichs, Ernst Krüger: In-Line-Rohrvermessung mit Hilfe von Mehrkanal-Ultraschall, Zeitschrift Plastverarbeiter 1992 Nr.7, Seiten 55 - 59.


    Rolf Diederichs studied Communication Engineering at the Engineering University in Köln and has 20 years working experience in the field of computerized Ultrasonic Systems, specifically in the area of Nondestructive Testing and Process Control. He worked in Development, Engineering, After Sales, Applications, Sales, Product Marketing for Ultrasonic equipment and automatic testing machines and is a member of the German Society DGZfP. He founded the Internet Publishing & Consulting and the Ultrasonic Testing OnLine Journal
    E-mail: info@ndt.net

    Due to my former work I have considerable knowledge of this subject. I am concerned about the situation that currently exists in our gas plastic pipe manufacturing industry, and feel a sense of responsibility to share and publish the information I have. There is nothing in this article, however, that violates any non-disclosure agreement that I may have with former employers. Purely personal knowledge is the property of the individual and not subject to the provisions of such agreements. This information is either my personal knowledge or has already been made available to the public through other channels.
    Rolf Diederichs

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