Comparison of cathodic protection currents on 70/30 copper-nickel and alloy 625 piping systems
Conference
·
OSTI ID:128699
- Naval Surface Warfare Center, Annapolis, MD (United States). Carderock Division
The question answered in this study is whether the demand on a cathodic protection system will change when the protected pipe material is changed from copper-nickel to alloy 625. Two piping mockups were designed to simulate a probable geometry for a cathodically-protected piping system. Each mockup consisted of a 20-foot (610-cm) length of nominal 2-inch (5-cm) diameter piping with a zinc anode for cathodic protection inserted in the discharge end of each. one mockup was made with 70-30 copper-nickel pipe and the other with alloy 625 pipe. Protection currents and potential profiles inside the pipes were measured over a six-month exposure period in natural seawater flowing at 7-ft/s (210-cm/s). The total protection current and sacrificial anode consumption for alloy 625 pipe was half that for copper-nickel pipe. This means that replacing copper-nickel pipe with alloy 625 pipe in areas close to cathodically-protected heat exchangers or hulls will result in a more conservative design for the cathodic protection system than was the case for the original copper-nickel piping.
- OSTI ID:
- 128699
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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