Food shop piping and identifying colors

I. Pipe Selection

Metallic materials

Stainless steel tubes: Suitable for food and pharmaceutical industries, commonly used models are SUS304 (containing 18% chromium and 8% nickel) and SUS316 (additional 2% molybdenum for better corrosion resistance), which meet cleanliness requirements and are not susceptible to rusting12.

Steel pipes: galvanized steel pipes (with galvanized surface treatment) are used for general transport, seamless steel pipes are resistant to high temperatures and pressures and are suitable for boilers, heat exchangers and other scenarios12.

Cast iron pipes: resistant to soil and seawater corrosion, mostly used for wastewater pipelines or lined treated water mains1.

Non-ferrous metal materials

Pure copper pipes: good thermal conductivity, used in heat exchangers, instrument pipelines and breweries1.

Second, pipeline identification color system

Pipe identification specification

Water: green; steam: red; vacuum: white; compressed air: yellow 8.

Hazardous material (chemical) area: red and white warning line; fire channel: yellow and black crosswalk 5.

Color standard:

Symbols and parameters: identify the name of the substance, flow arrows, and process parameters such as pressure, temperature, etc., if necessary3.

Color separation management application

White: general workshop employees; yellow: quality inspection personnel; blue: engineering personnel; orange: management personnel67.

According to the cleanliness level, it is divided into general operation area (e.g. black area), quasi-clean area (grey area) and clean area (white area), and the color of tools and containers in each area needs to be unified6.

The raw area (pre-treatment) and cooked area (packaging) are distinguished by different colors to avoid cross contamination6.

Regional division:

Work clothes color:

Safety color based on

Red: prohibited/dangerous; blue: directive information; yellow: warning; green: safety tips (refer to GB 2893-2008 “Safety Color”)47.

III. Significance of implementation

Through color and symbol marking, we can avoid material misuse and cross-contamination, improve operational efficiency, and meet the requirements of GB 12694-2016 and other hygiene norms for the protection of personnel in different areas46

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