5.2 O. Reg. 211/01, O. Reg. 212/01 & TSSA Code Adoption Documents (CAD)

Ontario does not regulate natural gas and propane under one rule book. Each fuel has its own regulation under the TSS Act, and each regulation adopts national CSA codes through a Code Adoption Document (CAD). Mixing up the regulation numbers is one of the most common G.3 exam errors, so learn this pairing first.

1. The Regulatory Map

FS-279-26 replaced the 2021 Gaseous Fuels CAD (which had adopted B149.1-20). From June 1, 2026, the B149.1 edition you use in Ontario—and bring to the exam—is B149.1-25 as amended by the CAD.

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2. O. Reg. 212/01 (Gaseous Fuels): Sections a G.3 Must Know

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3. O. Reg. 211/01 (Propane Storage and Handling)

O. Reg. 211/01 mirrors much of the gaseous-fuels structure for propane: certificates and contractor registration, distributor access, occurrence reporting, and unacceptable conditions (ss. 19–20, with the same shut-off and notice steps as O. Reg. 212/01). It adds rules for cylinder handling facilities, filling plants, container refill centres, tank trucks and licensing.

Risk and Safety Management Plans (s. 3.1)

Retail outlets, filling plants, cardlock/keylock sites, private outlets and container refill centres must file a risk and safety management plan (RSMP) with the director. A Level 1 plan applies to smaller facilities—no more than 5,000 USWG total capacity (or 5,000 USWG fixed plus no more than 500 USWG portable storage); larger facilities file a Level 2 plan.

Safe handling of propane cylinders

• Filling limit: propane cylinders are filled by weight to a maximum filling density of 42% of their water capacity. Liquid propane expands roughly 1.5% for every 10°F rise, so the remaining vapour space (about 20% by volume) is the safety cushion.
• Requalification: Transport Canada (CSA B339) cylinders must not be refilled once their requalification date has passed; a new TC/DOT propane cylinder is due for requalification 10 years after its date of manufacture, and a registered facility re-stamps it.
• Location: CSA B149.2's location rules keep a cylinder's relief-valve discharge at least 3 ft (1 m) from any building opening and 10 ft (3 m) from any mechanical air intake, because propane vapour sinks and flows into openings.
• On construction projects O. Reg. 213/91 s. 122 requires welding and cutting cylinders to be protected from damage, never transported or stored lying horizontally, and to have their valves closed when not in use.

The filling-by-weight calculation:

$$\text{Maximum propane mass} = 0.42 \times \text{Water capacity (WC)}$$ $$\text{Full-scale reading} = \text{Tare weight (TW)} + 0.42 \times \text{WC}$$

Example: a cylinder stamped WC 47.6 lb and TW 17 lb holds at most $0.42 \times 47.6 \approx 20\text{ lb}$ of propane, so the scale should read about 37 lb when full.

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4. How a Code Adoption Document Works

A CSA code is a private standard; it becomes enforceable in Ontario only when a CAD adopts it under O. Reg. 223/01. FS-279-26 says so in plain terms: the Director for O. Reg. 212/01, acting under s. 6(1) of O. Reg. 223/01, revoked and replaced the whole Gaseous Fuels CAD. The CAD then states that "in the event of conflict between a provision of this document and any code or standard referred to in this document, this document shall prevail."

Ontario amendments worth tabbing

Orders and guidance

A director's safety order under TSS Act s. 14 is mandatory. TSSA advisories, bulletins and guidelines explain how TSSA reads the code, but the binding text is the regulation, the CAD and the codes it adopts.