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CSA B140.10-06 (2015): Technical Requirements for Oil Burning Equipment – Pressure Atomizing Oil Burners
A Comprehensive Guide to the Canadian National Standard for Design, Performance, and Safety of Pressure Atomizing Oil Burners
Introduction
The CSA B140.10-06 (2015) standard, developed by the Canadian Standards Association (CSA Group), establishes the minimum design, construction, performance, and safety requirements for pressure atomizing oil burners used in commercial and industrial applications. This standard is part of the B140 series covering oil-burning equipment and is a key reference for manufacturers, testing laboratories, and regulatory bodies in Canada.
Scope and Application
CSA B140.10-06 (2015) specifically addresses:
- Automatic and manually operated pressure atomizing oil burners
- Burners with a maximum firing rate of up to 100 L/h (approximately 1 000 kW)
- Burners intended for use with No. 1 and No. 2 fuel oil (as defined by CAN/CGSB-3.2 and CAN/CGSB-3.3)
- Burners designed for forced-draft or natural-draft combustion chambers
The standard does not cover vaporizing burners, rotary cup burners, low-pressure atomizing burners, or burners for residential use (these are addressed in other parts of the B140 series, such as CSA B140.2 and CSA B140.3).
Important: This standard does not cover installation, operation, or maintenance requirements; those are addressed in separate CSA installation codes (e.g., CSA B139) and local regulations.
Technical Requirements
Design and Construction
The standard lays out detailed specifications for the following components and characteristics:
- Fuel Supply System: Oil pump pressure, filtration, flow control, and shut-off valves must be designed to prevent leaks and ensure consistent fuel delivery.
- Air Supply: The fan or blower must provide sufficient combustion air over the entire firing range, with provisions for air shut-off during burner shutdown.
- Atomizer: The nozzle or atomization head must produce a stable, fine spray to achieve complete combustion with minimal soot formation.
- Ignition System: Electrodes must be positioned to reliably ignite the fuel-air mixture. The ignition transformer must provide a spark of adequate energy and duration.
- Control System: The burner must include automatic safety controls (flame scanner, high-Limit and low-limit thermostats, pressure switches) to ensure safe start-up, operation, and shutdown.
Performance Testing
Manufacturers must demonstrate that their burners meet the performance criteria specified in the standard. The following table summarizes key test parameters and acceptance limits:
| Test Parameter | Test Condition | Acceptance Criterion |
|---|---|---|
| Combustion air temperature | 20 °C ± 5 °C (standard ambient) | Not exceeding 40 °C at burner inlet |
| Fuel flow rate accuracy | At rated pump pressure | Within ±5 % of manufacturer’s stated rating |
| CO₂ concentration in flue gas | Optimum air setting (excess air ≤ 15 %) | ≥ 12 % for No. 1 oil; ≥ 11 % for No. 2 oil |
| Smoke number (Bacharach) | At all air settings between low fire and high fire | ≤ 2 (low fire), ≤ 1 (high fire) |
| Safety shutdown time | Simulated flame failure at steady state | < 2 seconds for flame detection; < 10 seconds for fuel valve closure |
| Burner noise level | Measured at 1 meter from burner, free field | < 85 dBA (at maximum firing rate) |
Additionally, the standard prescribes a 3 000-cycle endurance test and tests for electrical safety, overpressure, and abnormal operation.
Tip: When conducting compliance tests, reference the most recent editions of related standards such as CAN/ULC S634 (for fuel oil filters) or CSA C22.2 No. 0 (for electrical safety).
Safety and Control Systems
Every burner covered by CSA B140.10-06 (2015) must incorporate a certified primary safety control (flame safeguard) that:
- Proves flame within 1.5 seconds of the start of fuel flow
- Monitors the flame continuously during operation
- Shuts down the burner within 0.5 seconds of flame loss
The control system must also include a pre-purge cycle (not less than 15 seconds at 80 % of maximum air flow) and a post-purge cycle (not less than 30 seconds).
Critical: Burners intended for use with waste oils or used oils are not within the scope of this standard. Mixing fuel types can void certification and create serious safety hazards.
Implementation Highlights
For engineers and technicians integrating or installing CSA B140.10-06 (2015) certified burners, the following points are essential:
- Fuel Piping: All oil lines must comply with CSA B139 and include a flexible coupling or vibration isolator at the burner inlet.
- Electrical Connections: The burner must be wired to match the control voltage (typically 120 V, 60 Hz) and include a lockable disconnect within sight of the burner.
- Combustion Chamber: The chamber dimensions must match the burner’s flame geometry as per the manufacturer’s data sheet. Incorrect chamber sizing can lead to carbon formation and reduced efficiency.
- Venting: A properly sized chimney or mechanical exhaust system must be provided to maintain a negative draft at the burner outlet.
Best Practice: Commissioning should include a complete combustion analysis (O₂, CO₂, CO, smoke, and flue gas temperature) to verify that the burner operates within the limits of Table 1. Keep a log of all commissioning readings for future reference.
Compliance and Certification
To claim compliance with CSA B140.10-06 (2015), a burner must be tested and certified by an accredited third-party agency (e.g., CSA Group, Intertek, or UL Canada). The certification process involves:
- Review of design drawings and materials
- Performance and safety testing at the factory or a recognized laboratory
- Factory inspection for quality control procedures
- Annual follow-up inspections to maintain certification
Certified burners will bear the CSA (or applicable certification) mark and the standard designation. Manufacturers must also provide installation and operating manuals in both English and French, as required by Canadian regulations.
Regulatory authorities (e.g., provincial mechanical inspectors, Technical Safety BC, or TSSA in Ontario) require site-specific acceptance of the burner’s certification. It is the installer’s responsibility to ensure that the entire installation, including the burner, meets all applicable codes.
Note: While CSA B140.10-06 (2015) addresses safety and performance, it does not cover energy efficiency requirements. In Canada, efficiency standards for oil-fired boilers and furnaces are regulated under the Energy Efficiency Act, referencing CAN/CSA B212 (combined with U.S. standards).
Frequently Asked Questions
Q: Is CSA B140.10-06 (2015) the most current edition?
A: As of 2026, the standard is reaffirmed but not revised. It was originally published in 2006 and reaffirmed without changes in 2015. The CSA Group is currently considering updates to align with modern burner technology and emission requirements. Always check with CSA Group or your certification body for the latest revision status.
A: As of 2026, the standard is reaffirmed but not revised. It was originally published in 2006 and reaffirmed without changes in 2015. The CSA Group is currently considering updates to align with modern burner technology and emission requirements. Always check with CSA Group or your certification body for the latest revision status.
Q: Can a burner certified to a foreign standard (e.g., UL or EN) be used in Canada?
A: Only if the foreign standard is recognized by the local authority having jurisdiction (AHJ). Generally, burners must be certified to a Canadian standard (CSA) or be evaluated for equivalency by a recognized certification body. The marking must show compliance with CSA B140.10.
A: Only if the foreign standard is recognized by the local authority having jurisdiction (AHJ). Generally, burners must be certified to a Canadian standard (CSA) or be evaluated for equivalency by a recognized certification body. The marking must show compliance with CSA B140.10.
Q: Does CSA B140.10 apply to burners using biodiesel blends?
A: The standard as written covers only conventional No. 1 and No. 2 fuel oil. Blends up to B5 (5 % biodiesel) can often be used with certified burners, but the manufacturer should be consulted. Higher blends may require additional testing or a separate certification.
A: The standard as written covers only conventional No. 1 and No. 2 fuel oil. Blends up to B5 (5 % biodiesel) can often be used with certified burners, but the manufacturer should be consulted. Higher blends may require additional testing or a separate certification.
© 2026 CSA Group. This article provides a summary of CSA B140.10-06 (2015) and is not intended to replace the full standard. For certification and compliance, refer to the official document published by CSA Group.