REG NASA-LLIS-0844-2000 Lessons Learned Ground Piping Systems Color Coding and Identification.pdf

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1、Best Practices Entry: Best Practice Info:a71 Committee Approval Date: 2000-04-20a71 Center Point of Contact: KSCa71 Submitted by: Wil HarkinsSubject: Ground Piping Systems Color Coding and Identification Practice: Use color coding and identification on piping systems to identify the content and pres

2、sure of the contents.Programs that Certify Usage: This practice applies to all Ground Based Piping Systems installed in areas under the jurisdiction of KSC, including the systems located in floor trenches and above suspended ceilings. Sections of piping that are concealed underground, in floor slabs

3、, or in walls or partitions are not subject to the requirements of this practice.Center to Contact for Information: KSCImplementation Method: This Lesson Learned is based on Maintainability Technique number DFE-5 from NASA Technical Memorandum 4628, Recommended Techniques for Effective Maintainabili

4、ty.Benefit:Easy and ready identification of piping systems contents. Such identification can aid in:a71 Reduced time in researching a particular system location that is to be modified. Knowing the system that is to be modified, visual identification of that system eliminates a large amount of Provid

5、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-research time reviewing the pipe location drawings.a71 Safely traversing an area knowing which systems can be dangerous to physical contact. Examples of such systems are high temperature steam lines, low temp

6、erature LOX and LH2lines.a71 Tracing systems in search of leaks or in search of a shutoff valve to stop a leak.a71 Locating a fire box in case of fire (all fire lines are painted red).Each example has beneficial aspects from saving time to saving lives and equipment.Implementation Method:This practi

7、ce establishes, defines, and assigns a color for recognition to each of six classes of material. Five classes represent universally recognized types of hazards involved in the handling of dangerous gases/liquids. A sixth is assigned for exclusive use of fire protection for materials and equipment. T

8、he practice requires the application of color warnings in a distinctive manner, as a visual aid and supplement to written identification. Further details can be found in KSC-STD-SF-0004B.This practice is not applicable to electrical conduits, ventilation units, or pipelines installed in missiles, sp

9、acecraft airborne equipment, or storage vessels.Identification methods for bulk petroleum product system is covered in MIL-STD-161. The identification of pipelines for aircraft, missiles, and space vehicles is covered in MIL-STD-1247, and color coding for containers of liquid propellants is covered

10、in MIL-STD-172.Piping systems are described as any pipe line used to transport gases, liquids or semiliquids, but not those for carrying solids in gas or air. Valves, fittings, operating accessories, pipe coverings and tie-in points at storage facilities are considered piping systems.Piping identifi

11、cation is broken down into 4 types of markings on the outside of the pipe. The primary set of markings identifies the content which is shown by a color band taped around the pipe. All contents are broken down into 8 colors. The colors used conform to requirements identified in Federal Standard No. 5

12、95, “Colors“ and are:a71 Yellow, No. 13655 - Flammable Materials known ordinarily as flammables or combustibles.a71 Brown, No. 10080 - Toxic and Poisonous Materials. All materials extremely hazardous to life or health under normal conditions as toxics or poisons.a71 Blue, No. 15102 - Anesthetics and

13、 Harmful Materials. All materials productive of anesthetic vapors and all liquid chemicals and compounds hazardous to life and property but not normally productive of dangerous quantities of fumes or vapors.a71 Green, No. 14110 - Oxidizing Materials which readily furnish oxygen for combustion and fi

14、re producers which react explosively or with the evolution of heat in contact with many other Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-materials.a71 Gray, No. 16187 - Physically Dangerous Materials. All materials, not dangerous in themselves,

15、which are asphyxiating in confined areas or which are generally handled in a dangerous physical state of pressure or temperature.a71 Red, No. 11105 - Fire Protection Materials. All materials provided in piping systems or in compressed gas cylinders exclusively for use in fire protection.a71 Black, N

16、o. 17038 and White, No. 17875. These colors are assigned for general use where specified in KSC-STD-SF-0004B, “Safety Standard for Ground Piping Systems Color Coding and Identification“ except as follows. Water Piping Systems containing water suitable for human consumption and installed for this pur

17、pose shall be painted white, No. 17875 throughout or shall be painted to match surroundings when not in conflict with color designations in referenced standard.The second set of markings is shown as the color used in the flow arrow which is taped to the outside of the pipe. The secondary color marki

18、ng is used to identify a second characteristic associated with the content. If a second characteristic does not exist, the flow arrow is black and white. The flow arrow indicates the direction of flow, if the content can flow in either direction a double headed arrow is shown.The third set of markin

19、gs is the title. The title identifies the contents by name or recognized abbreviations. The titles may be taped, glued or stenciled onto the sides of the pipe.The fourth set is the pressure rating which is shown by a numerical number taped on the outside of the pipe. The pressure will be given immed

20、iately below the title using the same sizes and color. Piping systems may not need a pressure rating shown if it is below 60 psig.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-refer to D descriptionD Figure 1. Piping Systems, Color Warnings Provide

21、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-References:1. KSC-STD-SF-0004B2. MIL-STD-1613. MIL-STD-12474. MIL-STD-1725. FED-STD-595Impact of Non-Practice: Color coding of the piping systems provides accurate and immediate visual and written identificati

22、on of the contents within the pipe. This will provide greater safety and lessen the chances of confusion when working within an area with numerous piping systems. The markings on the outside of the pipe show content in color code, the flow direction, pressures and name of contents (See Figure 1).Related Practices: N/AAdditional Info: Approval Info: a71 Approval Date: 2000-04-20a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-