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Pig NFIO INI I AL In the table, the entries noted with an asterisk are situations where the MCC recommendations are either more detailed or more stringent than those in the API recommendations. Some examples are discussed next. The training requirements of MCC are more detailed and more demanding than those recommended by API 1631. API 1631 devotes only a portion of paragraph 4.4.1.3 to generally describing the repair of a tank; MCC has nearly a full page of detailed instructions on repairing by welding, using plugs, hydraulic cement, and silane- treated fiberglass cloth and resin. The API recommendations for fiberglass tanks are very cursory; the MCC instructions are nearly as detailed as those for steel tanks. MCC includes much more detail on safety precautions than does API. MCC provides more details on sludge removal methods than does API. There are some instances where we consider the MCC recommendations to be an improvement over those of API. For example, API indicates that the internal inspection be conducted before sandblasting of the interior, whereas MCC prefers to sandblast first and then inspect. (The latter order of the steps is also the one required by the State of California.) The MCC method is preferred because areas of suspicion or small holes are more likely to be detected when viewing a clean surface. Also, if an ultrasonic inspection is conducted (the most preferred means of nondestructively determining the wall thickness), the method is aided by working on a clean surface. Obviously however, if large or numerous holes are observed that would rule out upgrading the tank before sandblasting, no further examination would be necessary. Another example is the installation of a striker plate. API 1631 calls for a steel striker plate to be welded to the floor and then coated over with the fining material. MCC lines the tank first, then installs the steel striker plate over the lining. This is preferred because the steel plate can better withstand impacts from sticking than can the lining material. In summary, the MCC written recommended practices for the internal lining and repair of underground storage tanks meet or exceed those of API 1631 in every respect. MRI-Amr.M400-FR 3