Skip to content

Pipe Marking Standards FAQ

DuraLabel Staff
Jun 09, 2025 1 MINUTE READ Last updated on: June 13, 2025
Labeled industrial pipes with ASME A13.1 color coding and directional arrows

 

Pipe Marking Standards for Safety and Compliance

This section covers the standards for labeling pipes under ASME A13.1 and ANSI guidelines. It defines label placement, color codes, and content requirements to ensure safe identification of pipe systems across facilities. 

Topics Covered: 

Learn how to apply compliant, effective pipe labels that enhance safety and visibility. 

  • Color and Text Standards: Use standard color codes and text to identify pipe contents and flow direction. 
  • Label Placement Guidelines: Apply labels at intervals and locations that maximize visibility and ensure compliance. 
  • Hazard Identification: Label hazardous materials in accordance with OSHA and ANSI requirements. 

Use this section to evaluate your current pipe labeling system and ensure it aligns with national safety standards. 

Pipe Marking Standards Frequently Asked Questions

  1. Are there different pipe marking standards in the UK vs. the US?
  2. Do I need UV-resistant labels for outdoor pipe systems?
  3. How do ammonia refrigeration systems work?
  4. How do I label refrigerant lines in an HVAC system?
  5. How do I mark directional flow on pipes?
  6. How does pipe marking support HAZOP analysis?
  7. How is ammonia used in refrigeration?
  8. Is ammonia flammable?
  9. Is ammonia safe to use?
  10. What are ammonia pipe labels and where are they placed?
  11. What colors should ammonia pipe labels be?
  12. What is the IIAR?
OSHA Quick Start Guide

Get Your Free OSHA Quick Start Guide

Stay compliant with OSHA regulations and improve safety with essential tips and strategies.



Take Action

Print Your Own Signs

Free Label Design Software

Free Labeling Samples