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PED Professional 6

Corrosion damage to copper pipes

   

Test specimens: copper piping with solder fittings, diameters 18 mm and 22 mm
Fig. 1:
Pipe diameter 22 mm; pitting and pinprick corrosion on internal pipe surface. Characteristics of type I pitting corrosion in cold drinking water
Fig. 2:
Polished section through soldered joint between fitting and straight pipe with considerable erosion (thinning) in the straight pipe section due to turbulent flow conditions caused by non-removed flash on shortened straight-pipe section.
Fig. 3:
Polished section through soldered joint between fitting and straight pipe. Joint only insufficiently filled with solder, and flashing on pipe end faced to length.

 

Description:
Damage caused by leaks in the copper piping supplying cold drinking water in a residential building was the reason for preparing a court opinion. The piping diameter was 18 and/or 22 mm.  

Failure cause:
Als Schadensursache wurden Lochkorrosionsangriffe vom Typ I nach DIN 50 930-5 festgestellt. Zudem besteht eine Begünstigung dieses Korrosionsschadens durch Erosionskorrosionsvorgänge, deren Ursache in handwerklichen und Planungsmängeln zu suchen ist. In diesem Zusammenhang ist hervorzuheben, dass bauseitig erforderliche Rohrablängungen nicht fachgerecht entgratet wurden, was zu örtlich turbulenten Strömungsverhältnissen und infolge dessen zu den festgestellten Erosionsvorgängen führte. Hohe Strömungsgeschwindigkeiten waren offensichtlich Ursache für das Abtragen von Schutzschichten in Geradrohrabschnitten, was darauf hindeutet, dass die Rohrabmessungen nicht richtig dimensioniert waren.

Remedy:
The damage analysis permitted a clear description of the failure causes, so that damage liability could be regulated by court verdict.

Our services – your benefits:
The expert opinion helped to clarify the facts and influenced the legal assessment of the case.

Consulting services from:
TÜV SÜD Industrie Service GmbH