Galvanic compatibility: Should brass and copper pipes be joined with copper-base alloy fittings (or otherwise compatible materials) to minimize galvanic corrosion and ensure long-term reliability?

Introduction / Context:
When dissimilar metals are joined in the presence of an electrolyte (such as water), galvanic corrosion can occur. Piping drawings and specifications should prevent harmful galvanic couples by selecting compatible materials for fittings and joints. This question reinforces the practice of using copper-base alloy fittings with brass and copper piping to reduce corrosion risk and extend service life.

Given Data / Assumptions:

• System involves copper/brass piping in contact with potable water or other conductive fluids.
• Joints may be soldered, brazed, or mechanically coupled.
• Environmental factors (chlorides, temperature, flow) influence corrosion rates.

Concept / Approach:
Materials close together in the galvanic series tend to minimize galvanic potential and corrosion. Copper, brass, and bronze are copper-base alloys with similar potentials, making them compatible. If a more noble or active metal must be used, designers add dielectric unions, insulating gaskets, or protective coatings to break the galvanic path. Detailing this in drawings and notes helps installers avoid inadvertent dissimilar metal contacts.

Step-by-Step Solution:

Verification / Alternative check:
Metallurgy references and plumbing codes recommend compatible alloys and dielectric isolation to mitigate galvanic corrosion. Field case histories show fewer failures when compatibility is maintained.

Why Other Options Are Wrong:
Limiting compatibility needs to cold water, elevated temperature, or insulation status misunderstands the galvanic mechanism; electrolyte presence and metal pairing drive the risk at many temperatures.

Common Pitfalls:
Mixing copper and galvanized steel without dielectric unions; using inappropriate brazing filler metals; neglecting stray current or grounding issues that exacerbate corrosion.

Final Answer:
Correct