If you are using a tombstone patch to repair an area in the critical zone you have to follow API-653, 9.10.1.2. Point f states the bottom plate under the perimeter of a welded-on patch plate shall meet the thickness requirements in 4.4. If you have an isolated hole through a plate in the...
On an existing field storage tank, the tank is going to be jacked and leveled due to excessive settlement. Once leveled, the old annular plate will be removed and new annular plate will be installed. To mitigate future settlement, a concrete annular ring or the use of a bearing plate is being...
