TR2321 - Piping Service Colour Coding and Identification System

14.11.2012 16:58
  1. Objective, target group and provision
    1. Objective
    2. Target group
    3. Provision
  2. Design requirements
    1. Extent of markers
    2. Material of markers and accessories
    3. Type of markers
    4. Marker sizes
    5. Marker information content
    6. Positioning of markers
    7. Special requirements for valves in fire fighting systems
    8. Electrically traced pipes
    9. Internally lined piping
    10. Colour coding information chart
    11. Manually operated valves and removable, special items
  3. Additional information
    1. Definitions
    2. Abbreviations
    3. Changes from previous version
    4. References
  4. App A Colour and service codes for plants and installation using older version of this TR2321
  5. App B Colour and service codes for Snorre A
  6. App C Colour and service codes for Snorre B

1 Objective, target group and provision 1.1 Objective The objective of this document is to describe the requirements for colour coding and marking of piping systems and manual valves. This specification shall be used for all projects, onshore and offshore. Onshore specific requirements are represented with heading “Onshore specific requirement:” and bold italics text. The requirements in this specification must be aligned with local statutory requirements. The colour codes given in this specification may be deviated for modifications on existing installations in order to avoid inconsistency/ confusion. Plants and installations in operation prior to issue of this document may request local colour requirements and service description to be included as an appendix below if found practical. 1.2 Target group The target group for this document is contractors and personnel involved in project planning, project execution and operation of plants/installations. 1.3 Provision This document is provided for in TR3010 “Mechanical Technology Technical Requirements and Standards”. 2 Design requirements 2.1 Extent of markers All lines, valves and removable piping special items identified by a line or tag number on the P&ID’s shall be provided with markers. This requirement also applies inside equipment package boundaries in accordance with TR0052. 2.2 Material of markers and accessories All materials used in markers, tape, brackets and lining must be suitable for the ambient and operational conditions they are exposed to including UV-radiation. The material properties shall be documented. Colours shall not be degraded over the design life time for the installation due to e.g. exposure to sunshine, oil, grease, steam wash, etc.

Materials for laminated plastic signs and text strips shall be polyethylene, polypropylene or polyvinyl chloride. 2.2.1 Laminated plastic signs Laminated plastic signs shall be manufactured of minimum 2 separate units. One layer where the colours and the text are printed, and one highly UV-resistant, transparency layer to protect colours and text. The laminated signs shall be soft/elastic down to -5 oC. Minimum bending radius shall be 10-12 times the thickness of the laminated sign. Bending tests shall be performed and documented. Laminated plastic signs shall be manufactured with right flow direction on one side and left direction on the opposite side to give full flexibility to installation. Minimum thickness of laminated plastic signs shall be 0,7mm For Type 3 laminated plastic signs, the punch holes for the strapping shall be placed well away from the sign edges to give the sign the required robustness against rough weather conditions. 2.2.2 Adhesive tape/band Adhesive tape/band shall be manufactured from PVC or polypropylene film on which the colour is printed on the reverse (adhesive) side or frontside printed with laminate. The adhesive used shall secure the tape firmly to pure metal surfaces or to surfaces coated or insulated in accordance with project specifications. Tape shall have an adhesive free from chlorides. The main and supplementary tape shall be wrapped around the pipe/ insulation cladding with a minimum overlap of 50 mm. The minimum size of the coloured area shall be in accordance with table 2. 2.2.3 Brackets Brackets shall be in marine grade aluminium. For Size 0 markers AISI 316 material is acceptable. The brackets shall be designed such that the contact area between the bracket and the pipe is minimized in order to avoid corrosion. The brackets shall be manufactured without sharp edges to avoid damage of painted surfaces and personal injuries. 2.2.4 Strapping All signs and brackets shall be fastened by use of plastic or rubber coated AISI 316 bands with locks. The locks shall be of a robust type to ensure durable locking of the bands. The straps shall be proportionate with the size/weight of the sign. Laminated plastic signs shall be fastened by at least 3 off straps. 2.3 Type of markers Markers shall be selected in accordance with table 1. Type 1: Laminated plastic sign mounted in stainless steel bracket fastened by coated stainless steel bands. Type 2: Laminated plastic sign mounted in aluminium bracket fastened by coated stainless steel bands. Type 3: Laminated plastic sign, fastened to the pipe by pipe by coated stainless steel bands. Type 4: Adhesive band/ plastic tape. Table 1 – Marker selection NPS [i n. ] Insulation OD [mm] Pipe material Max. normal operational temperature [oC] Exposed areas1) Sheltered areas1) < 2 None All All Type 1 Type 1 < 50 All All Type 1 Type 1 None Stainless/ high alloy steel All Type 2 Type 2 None Painted steel and non metallic ≥ 2 > 60 Type 2 Type 2 None Painted steel and non metallic < 60 Type 2 Type 4 ≥ 50 All All Type 2 or 32) Type 4 Note 1: See chapter 3.1, Definitions.

Note 2: The less costly alternative shall be chosen. Type 1 and 2 markers containing single components with a weight above 0,4 kg shall be provided with 5mm diameter hole(s) making it possible to secure these components with a safety wire. The need for installation of safety wire shall be evaluated based on the position of the marker and the risk of falling objects. The extent of safety wires shall be agreed with Company. 2.4 Marker sizes The size of the coloured area and the text height shall minimum be as given in table 2. Additional space must be provided for the supplementary colour tag and for strapping of laminated signs. The secondary colour field shall be 75 mm wide. Table 2 – Size of coloured area and text NPS [in.] Insulation OD [mm] Size no. Coloured area size [mm x mm] Text height [mm] ≤1 ½ 0 35 x 110 5 - 7 2 - 3 Ø60-Ø99 1 70 x 110 6 – 8 4 - 8 Ø 100- Ø249 2 100 x 160 8 – 10 ≥10 ≥Ø250 3 160 x 320 10 – 17 Special purpose size.1) 4 200 x 400 20 - 30 Note 1: Onshore specific requirement: To be used in cases of long reading distances. The position of the sign with regard to wind exposure shall be evaluated before implementing this marker size. Extra measures to ensure that the sign withstands the actual wind load shall be implemented were required. The outside diameter of the piping/tubing including insulation/cladding shall be the basis for determination of the sign size. The marker size shall be determined based on readability at the nearest accessible point without use of temporary scaffolding, lifting aids etc. The text shall normally be readable at 3.5 m distance. Where a reading distance of 3.5 m or less is impossible, the text height shall be maximized within the available space on the marker and/or larger marker sizes than dictated by the line size chosen to obtain a proper readability at the actual reading distance.