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Pipelines of industrial enterprises

Color marking, warning signs and marking plates

Based on GOST 14202-69. This page is not the original document. Translation may be inaccurate.

By the decision of the Committee of Standards, Measures and Measuring Devices attached to the Council of Ministers of the USSR of February 7, 1969 No. 168, the introduction period was established from 01.01.71.

1. This standard covers identification markings, warning signs and marking plates of pipelines (including connecting parts, fittings and insulation) on the designed, newly constructed, reconstructed and existing industrial enterprises inside buildings, on outdoor installations and communications located on overpasses and in underground channels to quickly determine the contents of pipelines and to facilitate the management of production processes, as well as to ensure work safety.

The standard does not apply to the identification of pipes and conduits with electrical wiring.

2. The following ten enlarged groups of substances transported by pipelines are installed:

  1. water;
  2. steam;
  3. air;
  4. combustible gases (including liquefied gases);
  5. non-combustible gases (including liquefied gases);
  6. acids;
  7. caustic;
  8. flammable liquids;
  9. non-flammable liquids;
  10. other substances.

3. Color marking and numerical designation of enlarged pipelines groups should correspond to those indicated in Table 1.

Table 1
Transported substanceSamples and color name of marking
Group numeric designationName
4Combustible gasesYellow
5Non-combustible gases
8Flammable liquidsBrown
9Non-flammable liquids
10Other substancesGray

4. The characteristics of the colors of the identification coloring shall comply with those specified in Annex 1.

5. Fire-fighting pipelines irrespective of their contents (water, foam, fire extinguishing steam, etc.), sprinkler and deluge systems in the areas of shut-off and control valves and in the places of connection of hoses and other devices for extinguishing the fire must be painted red (signal) .

If it is necessary to specify the contents of fire-fighting pipelines, they can be additionally designated by means of marking plates painted in corresponding distinctive colors.

6. The identification coloring of pipelines should be made continuous throughout the surface of communications or in separate areas.

The method of performing the identification coloring should be selected depending on the location of the pipelines, their length, diameter, the number of co-located lines, safety and industrial sanitation requirements, lighting conditions and visibility of pipelines for maintenance personnel and a general architectural solution.

Painting of pipelines by sections is recommended to be carried out in shops with a large number and length of communications, and also in those cases where the working conditions, due to increased requirements for color reproduction and the nature of the architectural solution of the interior, undesirable concentration of bright colors.

Identification color across the surface of pipelines it is recommended to apply at a small length and a relatively small number of communications, if it does not impair the conditions of work in the workshops.

On external installations, the identification of the entire surface is recommended only in cases where it does not cause deterioration of operating conditions due to exposure to solar radiation communications.

7. When applying the identification coloring to the pipelines inside the production premises, it is recommended to paint the rest of the communications surface in the color of the walls, partitions, ceilings and other elements of the interiors against which the pipelines are located. At the same time, it is not allowed to paint the pipelines between the areas of identification color adopted for other enlarged groups of substances.

8. When applying the identification of the areas to pipelines outside the buildings, the rest of the communication surface is recommended to be painted in colors that help reduce the thermal effects of solar radiation on the pipelines.

9. When laying communications in non-flow channels and with non-channel communication, areas of identification coloring on pipelines should be applied within the chambers and inspection wells.

10. Sites of identification coloring should be applied taking into account local conditions at the most important points of communications (at branches, at joints, flanges, at sampling points and instrumentation, in places of pipelines passing through walls, partitions, ceilings, at the inputs and outputs from production buildings and .p.) no less than 10 m inside the production premises and at outdoor installations and 30 - 60 m on the outer main routes.

11. The width of the areas of the identification coloring should be taken depending on the outer diameter of the pipelines (taking into account insulation):

With a greater number of parallel communication lines, the areas of identification on all pipelines are recommended to take the same width and apply them at the same intervals.

With large pipe diameters, the areas of identification coloring may be applied in the form of strips with a height of not less than 1/4 of the circumference of the pipeline.

12. To designate the most hazardous by the properties of transported substances on the pipelines, apply warning colored rings.

The identification color for the warning rings must be as specified in Table 2.

Table 2
Samples of signal colorsName of signal colorsProperty of transported substance
RedHighly flammable and explosive
YellowDanger or harmfulness (toxicity, the ability to cause suffocation, thermal or chemical burns, radioactivity, high pressure or deep vacuum, etc.)
GreenSafety or neutrality
1. When applying rings of yellow color on the marking color of pipelines of gases and acids, the rings must have black edges with a width of at least 10 mm.
2. When applying rings of green color on the marking color of water pipelines, the rings must have white edges with a width of at least 10 mm.

13. In cases where the substance simultaneously possesses several hazardous properties, designated by different colors, several colors must be applied to the pipelines at the same time.

On vacuum pipelines, except for the distinctive color, it is necessary to give the inscription "vacuum".

14. By the degree of danger to life and health of people or the operation of an enterprise, substances transported through pipelines must be divided into three groups, denoted by the corresponding number of warning rings in accordance with Table 3.

15. The characteristics of the signal colors shall be as specified in Annex 2.

16. The width of the warning rings and the distance between them should be adopted depending on the outer diameter of the pipelines in accordance with Fig. 1 and Table 4.

17. With a large number of parallel communication lines, the warning rings on all pipelines should be of the same width and applied at the same intervals.

18. Gas discharge lines and air blowing, depending on their contents, should have an identification color set for the symbol of enlarged groups, with winding transverse rings of the corresponding signal color.

19. Warning signs should be used in addition to color warning rings in order to designate pipelines that are particularly hazardous to human health and life or the operation of the enterprise, and if it is necessary to specify the hazard.

20. The following substances should be indicated by warning signs: toxic, flammable, explosive, radioactive, as well as other dangerous contents of pipelines (for example, substances that present a hazard during spraying, etc.).

21. The warning signs must be in the form of a triangle. Images should be black on a yellow background.

Table 3
GroupNumber of warning ringsTransported substancePressure, kgf/cm²Temperature, °С
1OneSuperheated steamUp to 22250 to 350
Hot water, saturated steam16 to 80Over 120
Superheated and saturated steam, hot water1 to 16120 to 250
Combustible (including liquefied and active gases, flammable and combustible liquids)Up to 25-70 to 250
Non-flammable liquids and vapors, inert gasesUp to 64-70 to 350
2TwoSuperheated steamUp to 39350 to 450
Hot water, saturated steam80 to 184Over 120
Products with toxic properties (except potent poisonous substances and fuming acids)Up to 16-70 to 350
Combustible (including liquefied and active gases, flammable and combustible liquids)25 to 64250 to 350; -70 to 0
Non-flammable liquids and vapors, inert gases64 to 100340 to 450; -70 to 0
3ThreeSuperheated steamRegardless of pressure450 to 660
Hot water, saturated steamOver 184Over 120
Strongly-acting poisonous substances and fuming acidsRegardless of pressure-70 to 700
Other products with toxic propertiesOver 16-70 to 700
Combustible (including liquefied and active gases, flammable and combustible liquids)Regardless of pressure350 to 750
Non-flammable liquids and vapors, inert gasesRegardless of pressure450 to 700
For substances that are hazardous by properties or a combination of properties not listed in this table, hazard groups should be established in consultation with government agencies.

The width of the warning rings and the distance between them, depending on the outer diameter of the pipelines
Fig. 1

Table 4
Outer diameter (with insulation) D, mmL, mma, mm
Up to 80200040
81 to 160300050
161 to 300400070
Over 3006000100

22. The image of warning signs should be taken in accordance with Fig. 2 and Table 5.

23. In those cases when the change in the shade of the distinctive colors can occur from the influence of aggressive flowing substances, the pipelines should be marked with the help of marking plates.

24. Marking plates should be used for additional identification of the type of substances and their parameters (temperature, pressure, etc.) required by the operating conditions.

Marking plates on pipelines or on the surface of structures to which pipelines are attached must be marked with alphabetic or digital inscriptions.

25. Inscriptions on the shields of pipelines must be carried clear, well legible font and shall not contain unnecessary data maloupotrebimyh terms and obscure acronyms. The font for inscriptions is recommended to be accepted in accordance with GOST 10807-78.

Inscriptions on the shields of pipelines
Fig. 2

Table 5
Size optionsa, mm

It is allowed to designate the substance type by means of numbers in accordance with Appendix 3.

The designation of the substance type by means of chemical formulas is not allowed.

26. The direction of flow of substances transported through pipelines should be indicated by the sharp end of the marking plates or arrows applied directly to the pipelines.

The shape and size of the arrows should correspond to the shape and size of the marking plates.

27. Marking plates must be of four types:

  1. to indicate a flow moving in both directions;
  2. the same, in the left direction;
  3. the same, in the right direction;
  4. to indicate the tapping of the transported substance.

28. The dimensions of the marking plates must correspond to those indicated in Fig. 3 and in Table 6.

29. Variants of the sizes of marking plates, inscriptions and warning signs should be applied mainly:

1 - in laboratories;

2 and 3 - in industrial premises;

4 and 5 - on outdoor installations and external trunk routes.

30. Warning signs when attaching them to pipelines should be put together with marking plates.

Warning signs on pipelines
Fig. 3

Table 6
Size optionsa, mmb, mmHeight of letters h, mm
one linetwo lines

31. The height of the markings on the pipelines should be taken depending on the outer diameter of the pipeline in accordance with Fig. 4 and Table 7.

The color of the markings and arrows indicating the direction of the flow applied to the pipelines and marking plates must be white or black, taking into account the greatest contrast with the main color of the pipelines.

The color of the inscriptions when deposited on the background of an identification color is:

white - on a green, red and brown background;

black - on blue, yellow, orange, purple and gray background.

32. The size of the marking plates, inscriptions and warning signs must be selected depending on the distance from which they should be perceived by the personnel associated with the operation of the pipelines, in accordance with Fig. 5 and Table 8.

33. Paint coatings for identification marking, marking plates and warning signs should be carried out in accordance with the applicable standards for paint and varnish materials and coatings, depending on the material of the pipelines or the insulation that protects them and the operating conditions, as well as the cost of paint and varnish coatings and the technology of their application.

34. Paintwork materials used for identification marking, marking plates and warning signs must meet the requirements of the relevant standards, as well as technical documentation approved in accordance with the established procedure.

35. When preparing surfaces for painting, applying and drying paintwork, the safety rules and fire-fighting measures prescribed by the current fire regulations and rules must be observed.

Table 7
Size optionsOuter diameter D, mmHeight of letters h, mm
one linetwo lines
1Up to 3019-
281 to 1603219
3161 to 2205025
4221 to 3006332
5Over 3009050

36. In the heated and ventilated industrial premises without aggressive media, it is recommended to perform the identification of pipelines, marking plates and warning signs with pentaphthalic enamels of PF-115 grades in accordance with GOST 6465-76, PF-133 according to GOST 926-82 and other brands according to technical documentation approved in the established order.

It is recommended to paint the fireproof pipelines and equipment with red enamel according to the technical documentation approved in the established order.

37. The identification and signal colors are allowed to be accepted in accordance with the following standards of the card index of color standards: green N 343 - 344; Red N 10 - 11; blue N 423 - 424; yellow N 205 - 206; orange N 101 - 102; purple N 505 - 506; brown N 647 - 648; gray N 894 - 895. Necessary shades of purple and brown in accordance with the samples of Table. 1 can be obtained by adding a white dye.

38. The identification coloring of pipelines and the color finishing of marking plates and warning signs should be periodically renewed in order to ensure a clear visibility of colors, images and inscriptions. The color should be smooth, without streaks, wrinkles, stains and should not flake.

39. Marking plates, inscriptions and warning signs should be located taking into account local conditions at the most important points of communication (at branches, at connection points, at sampling points, at valves, gate valves, control devices, in places of passage of pipelines through walls, partitions , overlapping, on inputs and outputs from production buildings, etc.).

Marking plates, warning signs and inscriptions on pipelines should be located in well-lit areas or illuminated to ensure their clear visibility, while the light sources should not cover the images and inscriptions, and dazzle the staff when observing them.

Marking plates, warning signs and inscriptions on pipelines should be located in well-lit areas
Fig. 5

Table 8
Distance from observer L in mRecommended size options for plates, inscriptions and signs
Up to 61
6 to 122
12 to 183
18 to 244
Over 245

The lowest illumination at responsible points of communication with the placement of marking plates, inscriptions and warning signs in them is recommended to take 150 lux with fluorescent lamps and 50 lux with incandescent lamps.

40. In all workplaces where pipelines are available, schemes for identifying the color of communications with decoding of distinctive colors, warning signs and digital signs taken for marking the pipelines should be hung on well-visible locations.

Annex 3

Numeric designationsTransported substance
1.3hot (water supply)
1.4hot (heating)
1.9other types of water
2.1low pressure steam (up to 2 kgf/cm2)
2.9other types of steam
3.6of pneumatic transport
3.9other types of air
4Combustible gases
4.5hydrogen and its gases
4.6hydrocarbons and their derivatives
4.7carbon monoxide and gases containing it
4.9other types of combustible gases
4.0combustible waste gases
5Non-combustible gases
5.1nitrogen and gases containing it
5.3chlorine and gases containing it
5.4carbon dioxide and gases containing it
5.5inert gases
5.6sulphurous gas and gases containing it
5.9other types of non-combustible gases
5.0spent non-flammable gases
6.5inorganic acids and their solutions
6.6organic acids and their solutions
6.7solutions of acid salts
6.9other liquids of acid
6.0waste acids (at pH < 6.5)
Numeric designationsTransported substance
7.4calcareous water
7.5inorganic alkalis and solutions
7.6organic alkalis and solutions
7.9other liquids of alkaline
7.0spent alkalis and alkaline wastes (pH> 8.5)
8Combustible liquids
8.1liquid of category A (tf <28 ° C)
8.2liquids of category B (tf> 28 ° C <120 ° C)
8.3liquids of category B (tf> 120 ° С)
8.4lubricating oils
8.5other organic flammable liquids
8.6explosive liquids
8.9other flammable liquids
8.0combustible effluents
9Non-flammable liquids
9.1liquid food products
9.2aqueous solutions (neutral)
9.3other solutions (neutral)
9.4aqueous suspensions
9.5other suspensions
9.9other non-flammable liquids
9.0non-combustible effluents (neutral)
0Other substances
0.1powder materials
0.2granular materials
0.3mixtures of solid materials with air
0.5water pulp
0.6pulps of other liquids
0.0spent solid materials