1. Accumulation of unburning fuel or flammable gases in the boiler furnace.
2. Ineffective purging of the furnace and gas passages with air will result in pockets of combustile mixture remaining in the system.
3. Poor combustion due to incorrect burner setting, worn atomizers and insufficient or excessive air.
An explosion can occur if the percentage of fuel in a fuel - air mixture (by volume) falls between lower explosive limit and upper explosive limit.
The LEL is 0.6% by volume vapor to oxygen and UEL is 4.0% by volume to vapor to oxygen.
Maximum explosion can occur at 2.0% by volume vapor to oxygen.
Maximum explosion can occur at 2.0% by volume vapor to oxygen.
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