1. Purpose

  To facilitate the identification of substances in industrial pipelines, ensure safe production, and avoid misjudgments during operations and equipment maintenance, this specification is formulated based on the actual conditions of the company.

  2. Scope of Application

  This specification defines the basic identification colors, identification symbols, and safety markings for industrial pipelines.

  This specification applies to the transportation pipelines of gases and liquids in industrial production that are not buried underground.

  3. Definitions

  The following definitions are adopted in this standard:

  3.1 Identification Color: The color used to identify the type of substance in an industrial pipeline.

  3.2 Identification Symbol: The mark used to identify the name and state of the substance in an industrial pipeline.

  3.3 Hazard Marking: Indicates that the substance in the industrial pipeline is a hazardous chemical.

  3.4 Firefighting Marking: Indicates that the substance in the industrial pipeline is specifically used for firefighting.

  4. Basic Identification Colors

  4.1 Based on the general properties of the substances in the pipelines, they are divided into eight categories, and eight basic identification colors and corresponding color standard codes are specified as shown in the table below.

  Substance Type Basic Identification Color Color Standard Code Color Sample

  4.2 Methods for Basic Identification Color Marking

  The methods for marking the basic identification colors on industrial pipelines should be selected from the following five methods by the user.

  a) Marking along the entire length of the pipeline;

  b) Marking with a 150mm wide color ring on the pipeline;

  c) Marking with a rectangular identification color sign on the pipeline;

  d) Marking with a rectangular identification color sign with an arrow on the pipeline;

  e) Marking with a hanging identification color sign on the pipeline.

  4.3 When using methods b), c), d), and e) in 4.2, the minimum distance between two markings should be 10m.

  4.4 The minimum size of the signs in 4.2 c), d), and e) should be determined based on the clarity of the identification color.

  4.5 When using methods b), c), d), and e) in 4.2 for basic identification color marking, the marking locations should include the start, end, intersections, bends, valves, both sides of wall penetrations, and other necessary locations on the pipeline.

  

  5. Identification Symbols

  The identification symbols for industrial pipelines consist of the substance name, flow direction, and main process parameters, and should meet the following requirements:

  5.1 Identification of Substance Name

  a) Full name of the substance. For example: Nitrogen, Sulfuric Acid, Methanol.

  b) Chemical formula. For example: N2, H2SO4, CH3OH.

  5.2 Identification of Substance Flow Direction

  5.2.1 The flow direction of the substance in the industrial pipeline is indicated by an arrow. If the flow direction is bidirectional, a bidirectional arrow should be used.

  5.2.2 When using methods d) and e) in 4.2 for basic identification color marking, the direction of the sign should indicate the flow direction of the substance in the pipeline. If the flow direction is bidirectional, the sign should be bidirectional.

  5.3 The identification of main process parameters such as pressure, temperature, and flow rate can be determined by the user as needed.

  5.4 The minimum font size for letters and numbers in 5.1 and 5.3, and the minimum size for arrows in 5.2, should be determined based on the clarity of the identification symbols.

  6. Safety Markings

  6.1 Hazard Marking

  a) Scope of Application: Pipelines containing substances listed as hazardous chemicals in GB13690 should have hazard markings.

  b) Marking Method: A 150mm wide yellow ring or band with 25mm wide black bands on both sides should be painted on the pipeline. The safety color range should comply with GB2893.

  c) Marking Location: On or near the basic identification color marking.

  6.2 Firefighting Marking

  Firefighting pipelines in industrial production should comply with GB13495 and be marked with the "Firefighting Only" identification symbol. The marking location and minimum font size should comply with sections 4.5 and 5.4, respectively.

  7. Regulations for Painting and Labeling Industrial Pipelines

  7.1 Heating equipment should be painted silver without any labeling.

  7.2 Ventilation pipelines (except for plastic pipes) should be painted gray.

  7.3 Stainless steel pipes, non-ferrous metal pipes, glass pipes, plastic pipes, and pipes with external lead sheathing for insulation should not be painted.

  7.4 Pipelines in outdoor trenches should not be painted, but the joints in manholes should be painted according to the medium.

  7.5 Pipelines with asphalt-coated insulation for corrosion protection should not be painted.