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CSA B137 Series-17: Comprehensive Standards for Thermoplastic Pressure Piping Systems
An overview of the Canadian standard series covering PVC, CPVC, PE, PEX, ABS, and other thermoplastic piping materials
Scope and Application of CSA B137 Series-17
The CSA B137 Series-17 is a suite of standards published by the Canadian Standards Association (CSA) that establishes the requirements for thermoplastic pressure piping systems. These systems are widely used in plumbing, heating, gas distribution, water service, and industrial applications across Canada. The series is referenced by the National Plumbing Code of Canada and the National Building Code of Canada, making compliance essential for code acceptance.
The series covers a broad range of thermoplastic materials, including polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), polyethylene (PE), crosslinked polyethylene (PEX), acrylonitrile-butadiene-styrene (ABS), and polypropylene (PP). Each material has a dedicated Part within the series, addressing specific dimensions, pressure ratings, and quality control requirements.
Note: CSA B137 Series-17 was published in 2017 and remains current. Some parts have been updated individually after 2017; always check the latest revision for the specific Part you are using.
Technical Requirements and Material Specifications
Structure of the Series
The CSA B137 Series-17 includes a common General Requirements Part (B137.0) that applies to all materials, followed by separate Parts for each thermoplastic type. Below is a summary of the most commonly referenced Parts:
| Part | Material | Typical Applications | Key Pressure Ranges (at 23°C) |
|---|---|---|---|
| B137.0 | Definitions and General Requirements | Common testing, marking, and quality provisions | N/A |
| B137.1 | PVC (Polyvinyl Chloride) | Water service, drainage, storm sewer (non‑pressure for sewer) | 2.0 – 4.0 MPa (290 – 580 psi) |
| B137.2 | CPVC (Chlorinated PVC) | Hot and cold water distribution, industrial piping | 2.0 – 4.5 MPa (290 – 650 psi) |
| B137.3 | PE (Polyethylene) | Water service, gas distribution, irrigation | 0.4 – 1.6 MPa (58 – 232 psi) |
| B137.4 | PEX (Crosslinked PE) | Radiant heating, potable water plumbing | 0.6 – 1.2 MPa (87 – 174 psi) at elevated temps |
| B137.5 | ABS (Acrylonitrile-Butadiene-Styrene) | Drainage, waste, vent (limited pressure use) | 0.35 – 0.7 MPa (50 – 100 psi) |
Dimension and Performance Criteria
Each Part specifies requirements for:
- Dimensions: Outside diameters, wall thicknesses, and tolerances (often based on IPS or CTS sizing).
- Pressure ratings: Determined by hydrostatic design basis (HDB) or minimum required strength (MRS) at 23°C and 73°F.
- Material properties: Density, tensile strength, elongation, and impact resistance.
- Quality assurance: In‑process testing, lot traceability, and periodic type testing.
Tip for specifiers: When selecting a thermoplastic piping system, always verify that the chosen Part matches the intended application temperature and pressure conditions. For hot water applications, CPVC (B137.2) or PEX (B137.4) are the most common choices.
Implementation Highlights and Compliance Notes
Certification and Marking
Products claiming compliance with CSA B137 Series-17 must be certified by an accredited agency (e.g., CSA Group, UL, ICC-ES). The certification mark, along with the Part number and pressure rating, must be permanently marked on the pipe and fittings at specified intervals.
Installation Considerations
- Follow the manufacturer’s instructions for joining methods—solvent cement for PVC/CPVC/ABS, heat fusion for PE, and mechanical fittings for PEX.
- Support spacing must account for the material’s modulus at the operating temperature; higher temperatures may require closer supports.
- Protect CPVC and PEX from direct sunlight exposure if installed outdoors unless UV-resistant formulations are specified.
Warning: Mixing materials from different Parts of the series is not permitted unless specifically allowed by the applicable code or standard. For example, PVC and CPVC fittings are not interchangeable due to different chemical resistances and pressure ratings.
Common Compliance Pitfalls
- Wrong pipe schedule: Using non‑pressure pipe (e.g., SDR 26 for gravity flow) in a pressure system.
- Temperature derating: Failing to apply the pressure derating factors when operating above 23°C (73°F).
- Uncertified fittings: Generic fittings that lack the required CSA certification mark.
Compliance best practice: Always request the manufacturer’s certificate of compliance and test reports before accepting a shipment. Periodic third-party audits help maintain product consistency.
Frequently Asked Questions
Q: Where can I obtain a copy of CSA B137 Series-17?
A: The standard is available from CSA Group’s online store and authorized distributors. A consolidated version containing all Parts is also sold as a bound volume.
A: The standard is available from CSA Group’s online store and authorized distributors. A consolidated version containing all Parts is also sold as a bound volume.
Q: Are the pressure ratings in the series valid for hot water?
A: Only materials with a recognized HDB at elevated temperatures can be used for hot water. CPVC and PEX have published temperature derating tables. PVC and PE are generally limited to cold water applications (max 60°C for CPVC, 82°C for PEX).
A: Only materials with a recognized HDB at elevated temperatures can be used for hot water. CPVC and PEX have published temperature derating tables. PVC and PE are generally limited to cold water applications (max 60°C for CPVC, 82°C for PEX).
Q: Do all provinces accept CSA B137 Series-17?
A: Yes, the series is referenced in the National Plumbing Code, which is adopted (with minor modifications) by most provinces and territories. Local amendments may add requirements, so always consult the authority having jurisdiction.
A: Yes, the series is referenced in the National Plumbing Code, which is adopted (with minor modifications) by most provinces and territories. Local amendments may add requirements, so always consult the authority having jurisdiction.
Q: How does this series relate to ASTM or ISO standards?
A: CSA B137 Series-17 is largely harmonized with ASTM specifications (e.g., ASTM D1785 for PVC, ASTM F441 for CPVC) but includes additional provisions specific to Canadian codes and installation practices. For international projects, a cross‑reference table is recommended.
A: CSA B137 Series-17 is largely harmonized with ASTM specifications (e.g., ASTM D1785 for PVC, ASTM F441 for CPVC) but includes additional provisions specific to Canadian codes and installation practices. For international projects, a cross‑reference table is recommended.
Article prepared for technical documentation purposes. This content reflects the requirements of CSA B137 Series-17 as of 2026.