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DENVER — State regulators are considering proposed new rules for thousands of oil and gas pipelines after a fatal explosion in Firestone last year blamed on leaking gas.

The Colorado Oil and Gas Conservation Commission opened two days of hearings Monday on regulations for installing, testing and shutting down flow lines, which carry oil and gas from wells to nearby equipment.

The rules are in response to a house explosion in Firestone in April that killed two men. Investigators said the explosion was caused by odorless, unrefined gas leaking from a severed flow line.

The new rules are a significant expansion of existing ones. A final version will be drawn up after the hearings.

The commission will vote after that, but no date has been set.