I want to figure out if a repiping project is safe, how do I determine if piping is poly-v or pex?
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Rosie's answer
Published by SALUSMy knowledge base does not contain specific documentation that outlines how to differentiate between polybutylene (poly-v) and cross-linked polyethylene (PEX) piping materials. However, I can provide general safety guidance based on industry best practices for working with piping.
General safety guidelines for working with piping include:
- Always wear appropriate personal protective equipment (PPE), including eye protection and gloves.
- Ensure proper ventilation when working in enclosed spaces.
- Identify the contents of the pipe before working on it. Where, in any one establishment, one or more hazardous substances are transported through pipe lines, all above ground piping systems used to transport gases, vapors, liquids, semi-liquids, or plastics shall be identified at points where confusion would introduce hazards to employees.
- Relieve pressure before disconnecting any pipes. When dismantling or opening closed pressurized or gravity fed systems, internal pressure shall be relieved or other methods utilized to prevent sudden release of pressure or spraying of liquid.
- Inspect pipes for damage or corrosion before handling.
- Use appropriate tools and techniques for cutting and joining pipes.
- Follow all safety regulations and guidelines.
- Make joints liquid-tight. Welded or screwed joints or approved connectors shall be used. Threaded joints and connections shall be made up tight with a suitable lubricant or piping compound.
Regulatory compliance requires that piping systems be properly identified to prevent hazards to employees. Methods of identification include complete color painting, color bands, names or abbreviations stenciled on the pipe, or tags securely fastened to the system. [1] [1]
All pressure piping shall be designed, constructed, installed, and maintained in accordance with good engineering practice. Piping which meets the requirements of the applicable ANSI B31 standard shall be considered as providing reasonable safety. [2]
Sources used for this answer
[1] Cal/OSHA Regulations | Chapter 4 | Subchapter 7: General Industry Safety Orders | 3321. Identification of Piping
Page 1
Open source documentSource excerpt
This information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov. These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at https://www.dir.ca.gov/od_pub/disclaimer.html. Subchapter 7. General Industry Safety Orders Group 2. Safe Practices and Personal Protection Article 7. Miscellaneous Safe Practices Return to index New query ## 3321. Identification of Piping. (a) Where, in any one establishment, one or more hazardous substances are transported through pipe lines, all above ground piping systems used to transport gases, vapors, liquids, semi-liquids, or plastics shall be identified at points where confusion would introduce hazards to employees. (b) Methods of Identification. Where identification is required for piping systems, one or more of the following methods shall be employed. (1) Complete color painting of all visible parts of the pipe; (2) Color bands, preferably 8 to 10 inches wide, at various intervals and at each outlet valve or connection. - Where identification is provided by complete color painting or by color bands, a color code shall be posted at those locations where confusion would introduce hazards to employees. (3) The names of or abbreviations of the names of the materials transported shall be lettered or stenciled on the pipe near the valves or outlets. (4) Tags of metal or other suitable material naming the material transported shall be fastened securely to the system on or near the valve. Tag legibility shall be maintained. Go Back to Article 7 Table of Contents
[2] Cal/OSHA Regulations | Chapter 4 | Subchapter 7: General Industry Safety Orders | §3329. Pipe Lines
Page 1
Open source documentSource excerpt
This information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov. These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at https://www.dir.ca.gov/od_pub/disclaimer.html. Subchapter 7. General Industry Safety Orders Group 2. Safe Practices and Personal Protection Article 7. Miscellaneous Safe Practices Return to index New query ## §3329. Pipe Lines. (a) Pipe lines containing hot, poisonous, corrosive or flammable substances shall be supported and maintained so as to prevent dangerous vibration under normal operating conditions. (b) All pressure piping shall be designed, constructed, installed, and maintained in accordance with good engineering practice. Piping which meets the requirements of the applicable ANSI B31 standard shall be considered as providing reasonable safety. (c) Leaks from pipe lines, piping or from other equipment shall be stopped if employees are endangered by the liberated liquids, gases or vapors. If hazardous leakage cannot be stopped during plant operation, diversion shields, or other effective means, shall be installed to protect the work area and employees involved. (d) When dismantling or opening closed pressurized or gravity fed systems, internal pressure shall be relieved or other methods utilized to prevent sudden release of pressure or spraying of liquid. (e) At all times during the repair, modification, or maintenance work, energy within the system shall be controlled to prevent an uncontrolled release that could cause injury. - Note: Extreme care shall be taken to prevent the build-up of excessive internal pressure if external heat is used to free solid blockages within liquid pipe lines. Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code. ## HISTORY 1. New section filed 10-25-74; effective thirtieth day thereafter (Register 74…
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