Interior pipe renovation

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This article or paragraph presents the situation in Germany . Help us to describe the situation in other countries.

The interior pipe renovation is a arisings before 1987 restoration procedures for drinking water pipes. The pipes are cleaned from the inside and coated with an epoxy resin . The method is also used for other installation lines, such as underfloor heating and sewer pipes.

history

The process was applied for a patent in 1987 by the Swiss engineer Werner Näf . To this day, other companies have offered variations of the original process on the market. The procedures differ essentially in the cleaning of the pipelines and in the use of different coating materials.

Procedural bases

Drinking water installations, in particular made of galvanized steel pipe, often show considerable deposits of corrosion products on the inside after prolonged use. This can lead to reduced flow and / or leakage. Such badly damaged pipelines are usually replaced; this is a complex but also permanent solution. During pipe rehabilitation, the deposits that have arisen are removed by blasting or pickling processes and then lined with epoxy resin. The resin protects the exposed inner pipe surface from corrosion. The success of the process depends on the correct execution of all detailed steps on site, it is by no means an easy-to-master system. In particular, the complete removal of all deposits is essential for permanent repairs. Comprehensive documentation of all process steps is important for checking the execution of the work, since subsequent non-destructive testing is not possible.

Legal requirements

The requirements for the use of such procedures in Germany are laid down in Section 17 TrinkwV 2001 (Drinking Water Ordinance ). Section 17 (1.2) of the Drinking Water Ordinance states:

(1) Systems for the extraction, treatment or distribution of drinking water are to be planned, built and operated at least in accordance with the generally recognized rules of technology.
(2) Materials that are used for the construction or maintenance of systems for the extraction, treatment or distribution of drinking water and that come into contact with drinking water are not permitted
1. directly or indirectly reduce the protection of human health provided for in this Ordinance,
2. adversely affect the smell or taste of the water or
3. Release substances into drinking water in quantities that are greater than is unavoidable if the generally recognized rules of technology are observed.

This means that all drinking water installations, including pipe renovation, must comply with the generally recognized rules of technology . Supplementary legal regulations may be regulated in the state building codes of the states.

Regulations for pipe rehabilitation

At the same time, there are other regulations for pipe rehabilitation in Germany. These are currently essentially:

Previously, DVGW also had regulations on pipe rehabilitation, in particular

  • DVGW worksheet VP 548 (proof of the usability of the process)
  • The DVGW worksheet W 545 (proof of the suitability of the executing company)

In July 2011 the DVGW decided to withdraw the worksheets. This is justified with the still ongoing discussion about the suitability of the process. It is suggested that further research on applicability and lifespan should be carried out before reworking.

Hygienic aspects

The Federal Environment Agency in Germany has published the "Guideline for the hygienic assessment of organic coatings in contact with drinking water" as a recommendation. Approval for the process is not associated with this, however, as the Federal Environment Agency cannot issue this.

Furthermore, the topic of the ingredients of the epoxy resin (especially bisphenol A and epichlorohydrin ) is discussed critically. On the one hand, the discussion refers to the status of scientific publications on the topic and various statements from public institutions. On the other hand, however, also on the fact that the scientific discussion is not over and z. B. 2011 a ban on bisphenol-A was introduced in the EU for baby bottles. In addition, consider u. a. Sweden and France further restrictions on the use of bisphenol A.

In addition, the use of epoxy resin for the repair of isolated lead pipelines is viewed critically. While a failure of the coating can easily be determined after the repair of steel or copper pipes (brown water on steel) or does not have to lead to any impairment at all (copper), the failure of the coating on lead leads to extremely high lead concentrations in drinking water, which cannot be sensed, but are highly toxic. For lead installations that have already been repaired, the lead concentration in the stagnant water must be monitored at short intervals (2–3 months) in the kitchen and in the bathrooms.

Technical aspects

The durability of the rehabilitation method depends on the quality of the process, the coating material and, to a very large extent, on the proper execution of the work on site. Compared to conventional renovation methods, the habitability of the rooms is retained. Floors and walls do not have to be opened, the renovation time and costs are reduced.

In principle, such a renovation cannot achieve a service life comparable to that of a classic new installation. With this in mind, it is advisable to check the economic viability in relation to the individual case.

Current legal discussion

This article or section needs revision: what is the status today? This collection of individual judgments from the last 10 years is not encyclopedic.
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The Cologne District Court decided in April 2011 that after a renovation with the procedure, a rent reduction of 20% was justified. The court referred to the harmful ingredients in the epoxy resin; the judgment referred to the Wikipedia online encyclopedia. For its part, the judgment was discussed negatively.

The water suppliers in Mannheim ( MVV Energie ) and Cologne ( RheinEnergie AG ) prohibit the use of pipe renovation with epoxy resin, and Mainova AG has subsequently banned all pipe renovations with epoxy resin products for the cities of Frankfurt am Main and Hanau. This fact is also the subject of controversial discussion. With a ruling dated July 12, 2012, the Bad Dürkheim District Court rejected a rent reduction due to an interior pipe renovation with epoxy resin products. The Office for Health of the City of Frankfurt am Main warns against renovation of the interior of pipes with epoxy resin and points out that the method does not comply with the generally recognized rules of technology required by the Drinking Water Ordinance. The technology was also rejected in a ruling by the Bensheim District Court in 2009 on the grounds that the materials used for internal pipe rehabilitation are construction products, but there is no internal pipe rehabilitation process on the market that has the required type approval. Meanwhile, the water supplier in Mainz ( Mainzer Stadtwerke ) has also pointed out the inadmissibility of the renovation of the inside of the pipes. On the other hand, the Bavarian Administrative Court decided in 2018 that pipe renovations with epoxy resin do not generally have to be removed, as this presupposes a possible risk to human health in a specific individual case, which, according to the current state of knowledge, cannot be assumed to be positive.

Individual evidence

  1. ^ Report of the Neue Zürcher Zeitung
  2. ↑ TrinkVO as amended on November 1, 2011 , accessed on January 13, 2013
  3. ↑ a b Guideline for the hygienic assessment of organic coatings in contact with drinking water . of March 16, 2016 (PDF; 521 kB)
  4. ↑ According to the wording, however, the guideline is not based on the aaRT, but rather: "The guideline is not a legal norm and is therefore not binding. It represents the current state of science and technology with regard to the hygienic requirements for coatings in contact with water for human use ( Drinking water) within the meaning of the Drinking Water Ordinance 2001 (TrinkwV 2001). "(Guideline, p. 2)
  5. ↑ See www.bisphenol-a.org
  6. ↑ cf. u. a. Scientific Opinion on Bisphenol A: evaluation of a study investigating its neurodevelopmental toxicity, review of recent scientific literature on its toxicity and advice on the Danish risk assessment of Bisphenol A, in: EFSA Journal 2010; 8 (9): 1829 [116 pp.]
  7. ↑ cf. http://www.eu-koordination.de/umweltnews/news/chemie/580-eu-weites-verbot-fuer-bisphenol-a-in-babyflaschen-ab-juni-2011 .
  8. ↑ See http://www.dradio.de/dlf/sendung/umwelt/2003182/
  9. ↑ See http://www.dradio.de/dlf/sendung/umwelt/2069040/
  10. ^ AG Cologne, judgment of April 20, 2011
  11. ↑ See Hans-Werner Laubinger: Die Rohrinnensanierung, Wikipedia and the AG Cologne, ZMR 2012, 25 ff.
  12. ↑ See Johannes Weisser, NJW-Editorial in issue 51/2011
  13. ↑ See RA Uwe Kühn, judgment note, ZMR 2012, 27 f.
  14. ↑ Archived copy ( Memento from February 9, 2015 in the Internet Archive )
  15. ↑ Information for contract installation companies and customers of RheinEnergie AG - regulations for house installation. (pdf) RheinEnergie AG, March 2018, accessed on March 10, 2020 .
  16. ↑ Cf. Jürgen Herrlein: "Out" for pipe renovation using epoxy resin coating? In: New Journal for Tenancy and Housing Law 2011, pp. 741–742
  17. ↑ See Hans-Werner Laubinger: "Out" for pipe renovation using epoxy resin coating? . In: Zeitschrift für Miet- und Raumrecht ', 6/2012, pp. 413–496.
  18. ^ AG Bad Dürkheim, AZ 1 C 222/12 of July 12, 2012. See also: Der ImmobilienVerwalter 6/2012.
  19. ↑ Renovation of the interior of drinking water pipes with epoxy resin / ceramic coatings. Health Department of the City of Frankfurt, August 2017, accessed on March 10, 2020 .
  20. ↑ Another decision became known - Part 4 to: Court sees pipe renovation as an improvement. Lawyers Radziwill Blidon Kleinspehn, March 4, 2013, accessed on March 10, 2020 .
  21. ↑ Interior pipe renovation of the drinking water installation. Mainzer Netze, October 17, 2019, accessed on March 10, 2020 .
  22. ↑ VGH Bayern: Water pipes renovated with epoxy resin do not generally have to be removed. March 13, 2018, accessed on March 10, 2020 (judgment of the VGH Bayern from March 6 , 2018, Az .: 20 B 1378/17).