I have seen this before where there is either a pipe or board on top of the oil tank holding it down? Is there a reason for this to be there? I do see it on a somewhat regular basis and have never actually done any research to figure out the real reason for it. I was inspecting this home for my cousin today so i am looking into it today. It has a lot of pressure on it and I think it has even cracked the tile floor above this area!
This is in a basement in a NH and the home was built in the late 90’s
Thanks for looking!