Try to contact an insurance company that provides insurance coverage on fired and unfired pressure vessels and which also provide inspection services on same objects. Two come to mind eventho there are a lot more insurance companies: 1)Hartford Steam Boilers 2) Travelers insurance company. You may not be able to contact these insurance co. representatives directly so you'll need to be referred , so I suggest that you speak with insurance agents that specialize in commercial insurance coverage (not to be confused with home owner insurance coverage)