![]() Airflow is typically not a problem at this stage. This opening provides access for personnel, equipment and material. A "door sheet" is then cut out, creating an opening approximately 8 feet wide by 10 feet high. With this ring in place, the tank walls are 16 to 20 feet high. Stage 2: a second ring is erected on top of the first ring and welded into place. The only means of entry/exit is a manhole cut into one of the steel plates (a "sheet") that comprises the ring. The first tank ring is erected, normally between 8 and 10 feet high. The first three stages are as follows: Stage 1: a concrete base is constructed upon which the tank ring walls will sit. Question (1)(a): Aboveground storage tank (AST) construction proceeds in several stages. We have paraphrased your questions as follows: We apologize for the delay in our response. ![]() This is in response to the January 18, 2006, letter you sent to the Occupational Safety and Health Administration, inquiring about the applicability of confined space requirements to aboveground storage tank construction.
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