I learned a lesson regarding shutting off the house water and then relieving the pressure. As a handy neighbor, I agreed to replace the expansion tank on the top of a water heater. Normally a very easy task, but it needs to be done in a particular order. First, shut off the water, second, open a faucet to relieve the pressure, third remove and replace the tank, fourth, turn on the house water, fifth, close the faucet. Unfortunately, I did step three before step two. The 65 pounds of pressure that remained in the lines sprayed all over me, the closet, and my friend as I loosened the threads. We were very wet. Had I opened a faucet, there would have been very little water that dripped from the tank.
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