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CSA 6.19-17 (2018): Requirements for Gas Appliance Connectors
Scope, testing, and compliance for the Canadian standard covering flexible and rigid connectors used with natural gas and propane appliances
CSA 6.19-17 (reaffirmed 2018) is a Canadian standard developed by the CSA Group that specifies safety and performance requirements for connectors used to supply gas to residential, commercial, and industrial appliances. This standard is harmonized with the U.S. standard ANSI Z21.24 and is referenced in provincial gas codes and energy safety regulations across Canada. Adopting the 2017 edition with continued approval in 2018, it ensures that gas connectors meet robust criteria for leak-tightness, mechanical strength, corrosion resistance, and durability. This article provides a technical overview of the standard?s scope, key requirements, testing protocols, and compliance notes for manufacturers, engineers, and field inspectors.
Scope and Application
CSA 6.19-17 applies to connectors for indoor use with natural gas, manufactured gas, liquefied petroleum (LP) gas, and LP gas-air mixtures at pressures not exceeding 1/2 psig (3.45 kPa). The standard covers both semi-rigid and flexible connectors, including:
- Corrugated stainless steel tubing (CSST) connectors
- Flexible metal hose connectors (e.g., braided stainless steel)
- Non-metallic (polymer) connectors for specific gas applications
- Connectors pre-assembled with fittings or designed for field assembly
Connectors covered by this standard are intended for use between a gas supply line and an appliance, such as ranges, dryers, water heaters, space heaters, and commercial cooking equipment. The standard does not apply to connectors for outdoor applications, high-pressure gas piping, or marine installations unless explicitly referenced by local codes.
Tip: Always verify that the connector length and configuration match the appliance and supply line arrangement. Excessive bending or stretching beyond the manufacturer’s guidelines can compromise performance and void certification.
Technical Requirements
Materials and Construction
All connectors shall be fabricated from materials capable of withstanding the intended service conditions without degradation. Common materials include Type 304 or 316 stainless steel for corrugated tubing, brass or steel for fittings, and elastomers for seals. Materials must comply with applicable ASTM or CSA material specifications. The standard mandates resistance to corrosion, stress corrosion cracking, and hydrogen embrittlement where relevant.
Pressure Ratings and Dimensions
Connectors are classified by nominal diameter and working pressure rating. The standard specifies dimensional tolerances for outside diameter, wall thickness, and fitting dimensions. Table 1 summarizes typical pressure ratings and flow capacities for commonly used connector sizes.
| Nominal Size (in.) | Outside Diameter (in.) | Maximum Working Pressure (psig) | Nominal Flow Capacity (SCFH @ 0.5? WC drop) |
|---|---|---|---|
| 3/8 | 0.500 ? 0.510 | 5 | 50 |
| 1/2 | 0.625 ? 0.635 | 5 | 100 |
| 3/4 | 0.875 ? 0.885 | 5 | 200 |
| 1 | 1.125 ? 1.135 | 5 | 380 |
Table 1: Representative dimensional and performance values for flexible connectors per CSA 6.19-17 (see standard for complete data)
Performance and Testing
Connectors are subjected to rigorous testing to verify compliance. Key tests include:
- Leak Test: Each connector is tested with air or inert gas at a pressure of 50 ± 1 psig (345 kPa) and shall show no leakage.
- Burst Test: The connector must withstand a pressure not less than 1500 psi (10.3 MPa) without rupture.
- Flexibility and Cycling: Connectors are flexed for at least 10,000 cycles at a defined angle without loss of gas-tightness.
- Temperature Resistance: Connectors are exposed to temperatures from -20°F (-29°C) to 140°F (60°C) and must pass leak tests after thermal cycling.
- Fatigue and Vibration: Simulates operational conditions including appliance vibration and installation movement.
Warning: Only connectors that have passed all tests and bear the certification mark of a recognized agency (e.g., CSA) are permitted to be installed under provincial and territorial gas codes. Counterfeit or uncertified products pose a serious fire and explosion hazard.
Implementation Highlights
Adopting CSA 6.19-17 in product design and installation involves several important considerations:
- Gas Compatibility: Connectors must be marked to indicate the gases for which they are certified (e.g., natural gas, propane). Mixing gas types without specific approval may void certification.
- Fire Stop and Secondary Barriers: Where connectors pass through walls or floors, additional fire stopping measures may be required by local building codes.
- Dielectric Isolation: Electrical isolation between the gas piping and the appliance is recommended to prevent galvanic corrosion; some connectors incorporate dielectric fittings.
Manufacturers should maintain a quality assurance program (e.g., ISO 9001) that ensures every connector produced meets the same type-test conditions. Periodic re-testing and follow-up inspections are part of the certification process.
Compliance and Market Access
In Canada, gas connectors must comply with CSA 6.19-17 and bear the certification mark of an accredited certifier, such as CSA Group, UL (C-UL), or other recognized organizations. Provincial gas safety authorities (e.g., Technical Standards & Safety Authority in Ontario, BC Safety Authority) adopt this standard by reference. Without proper certification, connectors cannot be sold or installed legally.
Key Compliance Point: Look for the CSA mark with the file number or the dual CSA/ANSI mark on the connector label or packaging. This ensures the product has been evaluated by an accredited third party to CSA 6.19-17 and is eligible for installation across Canada.
Danger: Use of non-compliant connectors can lead to gas leaks, carbon monoxide exposure, fires, or explosions. Installation uncertified connectors also voids insurance coverage in many cases. Always source products from reputable manufacturers with current certification.
Frequently Asked Questions
Q: What is the difference between CSA 6.19-17 and ANSI Z21.24?
A: CSA 6.19-17 is the Canadian version of the standard covering gas appliance connectors. It is technically harmonized with ANSI Z21.24-2017. The two documents are dual-listed, meaning a connector that meets CSA 6.19-17 also meets ANSI Z21.24. However, differences may exist in marking requirements and amperes of accreditation. Always check the certification mark to confirm it covers the country of installation.
A: CSA 6.19-17 is the Canadian version of the standard covering gas appliance connectors. It is technically harmonized with ANSI Z21.24-2017. The two documents are dual-listed, meaning a connector that meets CSA 6.19-17 also meets ANSI Z21.24. However, differences may exist in marking requirements and amperes of accreditation. Always check the certification mark to confirm it covers the country of installation.
Q: How often should gas connectors be replaced?
A: While CSA 6.19-17 does not explicitly mandate a replacement interval, manufacturers and safety organizations generally recommend replacing flexible gas connectors every 10 to 15 years, or immediately if signs of corrosion, damage, or leakage are observed. Connectors moving from a disconnected appliance should not be reused without inspection per manufacturer instructions.
A: While CSA 6.19-17 does not explicitly mandate a replacement interval, manufacturers and safety organizations generally recommend replacing flexible gas connectors every 10 to 15 years, or immediately if signs of corrosion, damage, or leakage are observed. Connectors moving from a disconnected appliance should not be reused without inspection per manufacturer instructions.
Q: Can CSA 6.19-17 connectors be used with propane?
A: Yes, provided the connector is certified for LP gas. The standard covers connectors for natural gas and LP gases. The certification label will indicate the approved fuel type. Propane typically requires higher flow capacity due to its lower specific gravity; ensure the connector size (e.g., 3/4? vs. 1/2?) is correctly selected based on the appliance BTU rating.
A: Yes, provided the connector is certified for LP gas. The standard covers connectors for natural gas and LP gases. The certification label will indicate the approved fuel type. Propane typically requires higher flow capacity due to its lower specific gravity; ensure the connector size (e.g., 3/4? vs. 1/2?) is correctly selected based on the appliance BTU rating.
Article prepared in 2026. CSA 6.19-17 (2018) remains a key safety standard for gas connectors. Manufacturers and users should always consult the current edition and any applicable provincial amendments.