Plant piping color code (utility lines): In chemical process plants, fresh water carrying pipelines are conventionally painted which identifying color?

Introduction / Context:
Piping color codes improve safety, maintenance, and troubleshooting. Utilities such as fresh water, cooling water, steam, compressed air, and fire water are color-coded so operators can quickly identify services.

Given Data / Assumptions:

• Standard industry practice per widely used plant coding schemes.
• Fresh (potable or service) water line identification.
• Colors are for quick field recognition, not instrument tagging.

Concept / Approach:
Many plants adopt codes where water services are green shades. Sea green is conventionally used for fresh water lines, distinct from red (fire water), yellow (flammable gases/fluids), and brown (oils or fuel lines in some schemes).

Step-by-Step Solution:
Match utility to standard color → fresh water → sea green.Reject colors reserved for other critical services (e.g., red for fire water).

Verification / Alternative check:
Plant standards and national codes (where adopted) list green hues for water; site-specific variants exist but the conventional answer remains sea green for fresh water.

Why Other Options Are Wrong:
Red denotes fire water/emergency; yellow commonly marks flammables/toxics; brown is often oils or waste streams, not fresh water.

Common Pitfalls:

• Confusing cooling water and fresh water markings; both are green family but distinguished by shade/stripe.
• Assuming all plants follow one national code; always confirm site standard.

Final Answer:
Sea green