B149.1:25 Overview of Changes

Natural Gas and Propane Installation Code

Interactive Learning Module - February 2025 Edition

Created by LARK Labs

1 of 12

Welcome to CSA B149.1:25 Training

Course Overview

After completing this course, you will be able to:

  • Identify the top substantive changes in CSA B149.1:25
  • Explain how additions, revisions, and deletions impact industry professionals
  • Apply the new requirements in practical situations
  • Understand the safety implications of the updates
Important: This is the seventeenth edition of CSA B149.1, introducing critical updates for enhanced safety and efficiency in natural gas and propane systems.

Knowledge Check 1

What is the primary purpose of the CSA B149.1:25 updates?

  • Enhancing safety and efficiency in gas and propane systems
  • Reducing installation costs
  • Simplifying code requirements
  • Expanding market opportunities

Code Scope Updates

Key Change: Demarcation Point Between B149.1 and B149.2

Updated Code Scope inclusions to clarify the threshold for propane systems between CSA B149.1 and CSA B149.2 [Clause 1.1b)]

Demarcation Point: The specific boundary that determines which code applies to different propane system components and installations.

Knowledge Check 2

Which clause addresses the updated demarcation point between B149.1 and B149.2?

  • Clause 1.1a)
  • Clause 1.1b)
  • Clause 1.2g)
  • Clause 1.3

Terminology and Definition Updates

Vehicle-Fuelling Appliance

Corrected terminology to "vehicle-fuelling appliance" to align with other CSA standards [Clause 1.1c)]

Updated Definitions (Clause 3)

  • High Pressure Regulator → Industrial Regulator
  • Line Pressure Regulator - Updated definition
  • Manual Shut-off Valve - New definition added
  • Vent Limiter - New definition with sub-definition "limiting orifice type"
Industrial Regulator: Previously known as "high pressure regulator," these devices are designed for higher flow rates and pressures beyond the scope of certified line pressure regulators.
Proper terminology is crucial for safety compliance and clear communication in the field.

Knowledge Check 3

What was the "high pressure regulator" renamed to in the 2025 edition?

  • Line pressure regulator
  • Service regulator
  • Industrial regulator
  • Commercial regulator

Hydrogen-Natural Gas Blends

Major Addition: Hydrogen-natural gas blends are now included in the Code scope, representing a significant advancement in clean energy technology.

Key Updates for Hydrogen Blends

  • Added to list of gases included in Code (Clause 1.3)
  • References added to multiple applicable clauses
  • Specific odorization or monitoring requirements
  • Updated rating plate requirements for maximum hydrogen percentage
  • Special sealant restrictions for larger pipe sizes

Knowledge Check 4

What special requirement applies to sealants when using hydrogen-natural gas blends?

  • Prohibited use of tape as sealant for pipe sizes larger than NPS 1-1/2
  • Must use special hydrogen-rated tape
  • Requires double-wrap application
  • No special requirements apply

Bonding and Electrical System Updates

Bonding Requirements Alignment

Updated bonding requirements to align with the Canadian Electrical Code, Part I (Clauses 4.7.3, 4.7.4, and 4.7.5)

Gas and Electrical System Separation

Added minimum separation requirements between gas systems and electrical systems sharing a common trench (Clause 6.15.15)

Proper bonding of gas piping systems and appliances to electrical ground is critical for safety and must comply with current electrical code requirements.

Knowledge Check 5

Which electrical code do the updated bonding requirements align with?

  • National Electrical Code (NEC)
  • Canadian Electrical Code, Part I
  • International Electrical Code
  • CSA Electrical Standard C22.1

Pressure Regulation and Protection

Industrial Regulator Applications

Added ability to use industrial regulators when flows/pressures are outside the scope of certified line pressure regulators, with mandatory interlocking to high/low gas pressure devices

Overpressure Protection Requirements

Clarified that overpressure protection devices used with certified line pressure regulators must be factory pre-assembled and shipped as a unit

Overpressure Protection: Safety devices that prevent dangerous pressure levels by automatically venting or shutting off gas flow when predetermined pressure limits are exceeded.

Knowledge Check 6

What is required when using industrial regulators?

  • Special CSA certification
  • Additional venting capacity
  • Interlocking with high/low gas pressure device serving same appliance
  • Double pressure monitoring systems

Venting and Clearance Requirements

Gas Vent Termination Clearances

Updated clearances for gas vent terminations (Table 5.3), now based on relief capacity and aligned with CSA Z662:23 (Annex D)

Consolidated Exemptions

Restructured Clause 5 to consolidate exemptions for outdoor gas vent terminations, accounting for vent limiters and indoor ventilated spaces

Proper vent termination clearances are critical to prevent gas accumulation and ensure safe dispersion of vented gases.

Knowledge Check 7

What is the new basis for gas vent termination clearances in Table 5.3?

  • Relief capacity
  • Pipe diameter
  • Building height
  • Wind speed

Piping and Materials Updates

Press-Connect Fittings

Updated requirements to permit press-connect fittings certified to CSA/ANSI LC 4/CSA 6.32 for piping of NPS 2-1/2 to 4 (Clause 6.9.2)

Liquid Propane System Restrictions

Prohibited the use of hoses certified to CSA 8.3 for liquid propane systems (Clause 6.2.12)

Sleeve Requirements

Added sleeve requirements for piping or tubing that passes through exterior walls (Clauses 6.16.9 and 6.16.10)

Knowledge Check 8

For which pipe sizes are press-connect fittings now permitted?

  • NPS 1/2 to 2
  • NPS 1 to 3
  • NPS 2 to 6
  • NPS 2-1/2 to 4

Testing and Purging Requirements

Leakage Test Updates

Clarified leakage test requirements and allowable leakage rates (Clauses 6.22.2, 6.22.3, 6.22.4, and Annex K)

Purging Monitoring

Added requirements for monitoring by combustible gas indicator during purging (Clauses 6.23.4 and 6.23.7)

Proper testing and purging procedures are essential for system safety and must be performed by qualified personnel using appropriate equipment.

Knowledge Check 9

What new monitoring requirement was added for purging operations?

  • Pressure monitoring
  • Combustible gas indicator monitoring
  • Temperature monitoring
  • Flow rate monitoring

Appliance-Specific Requirements

Stationary Engine Generator Assemblies

Must be certified to ANSI/CAN UL/ULC 2200 (Clause 7.2.4.1)

Commercial Clothes Dryers

Flexible foil noncombustible ducts must be certified to UL 2158A (Clause 7.4.3)

Direct-Fired Makeup Air Heaters

Permitted approved engineering designs for installation where food preparation areas are interconnected to public areas (Clauses 7.20.14 and 7.21.13)

Knowledge Check 10

What certification is required for stationary engine generator assemblies?

  • ANSI/CAN UL/ULC 2200
  • CSA B149.1
  • NFPA 37
  • UL 2158A

Summary of Major Changes

Critical Updates to Remember

  • Scope Clarification: Better demarcation between B149.1 and B149.2
  • Hydrogen Integration: Support for hydrogen-natural gas blends
  • Electrical Alignment: Updated bonding requirements with electrical code
  • Enhanced Safety: Improved testing, purging, and monitoring requirements
  • Material Updates: New provisions for press-connect fittings and restrictions
  • Industrial Applications: Expanded options for industrial regulators
These changes represent significant improvements in safety standards and must be implemented in all new installations and applicable retrofits.

Knowledge Check 11

Which of the following represents the most significant new addition to the code?

  • Press-connect fittings for larger pipes
  • Updated bonding requirements
  • Inclusion of hydrogen-natural gas blends
  • Industrial regulator applications

Final Assessment Quiz

Complete this quiz to test your understanding of CSA B149.1:25 changes. You need 80% to pass.

1. What is the new term for "high pressure regulator"?

  • Service regulator
  • Line pressure regulator
  • Industrial regulator
  • Commercial regulator

2. Hydrogen-natural gas blends must be:

  • Odorized or monitored by a detection system
  • Used only in residential applications
  • Limited to 5% hydrogen content
  • Installed with special purple piping

3. Press-connect fittings are now permitted for which pipe sizes?

  • NPS 1/2 to 2
  • NPS 1 to 3
  • NPS 2 to 6
  • NPS 2-1/2 to 4

4. During purging operations, what monitoring is required?

  • Pressure monitoring only
  • Combustible gas indicator monitoring
  • Temperature monitoring
  • No monitoring required

5. Gas vent termination clearances are now based on:

  • Relief capacity
  • Pipe diameter
  • Building height
  • Wind speed

Certificate of Completion

Congratulations on successfully completing the CSA B149.1:25 Overview of Changes training module!

Generate Your Certificate

Please enter your full name as you would like it to appear on your certificate:


Certificate of Completion
Professional Training Program

This is to certify that

[Participant Name]

has successfully completed the training program

CSA B149.1:25 Overview of Changes
Natural Gas and Propane Installation Code
Interactive Learning Module - February 2025 Edition
Minimum Passing Score: 80% | Duration: Self-Paced
Michael J. Kapin
LARK Labs Training Coordinator
Date of Completion
Certificate No: [Number]
Date: [Date]

LARK Labs

This interactive learning module was developed by LARK Labs, specializing in professional training solutions for technical industries.

For more information about our training programs and educational technology solutions, contact LARK Labs.

© 2025 LARK Labs. All rights reserved.

CSA B149.1:25 content is based on the Canadian Standards Association publication. This training module is designed for educational purposes and does not replace the official CSA B149.1:25 standard.

Disclaimer: Users are responsible for ensuring compliance with the most current version of applicable codes and standards as adopted by their local jurisdiction.