While commissioning a new boiler, the combustion analyzer showed the carbon monoxide levels rising rapidly. If the CO levels rose too high, the analyzer would freeze, making it impossible to complete the start-up of the boiler. To avoid the delay, I jumped up to pull the probe from the boiler stack before it reached the shutoff level of the analyzer. I did not see the black iron pipe directly above me.
My head crashed into the horizontal gate valve handle and the impact caused me to see stars everywhere and my legs were wobbly. I fought through the pain and dizziness to get the boiler started because the building needed heat. I left the jobsite with a bad headache and bruised pride.