Abstract: A system and method for detecting a leak or structural defect in a tank are provided. The system includes a removable test plate to seal an opening in a tank to be tested with all other openings in the tank to be sealed. The system also includes a motor-driven blower or other vacuum-generating device coupled to a first opening in the test plate. When the blower is activated, it generates a vacuum inside the tank of a predetermined value. A vacuum-monitoring device is coupled to a second opening in the test plate and monitors the vacuum in the tank. A leak or structural defect in the tank is indicated if the vacuum decreases from the predetermined value by more than a predetermined differential within a predetermined time.

Abstract: A system and method for detecting a leak or structural defect in a tank are provided. The system includes a removable test plate to seal an opening in a tank to be tested with all other openings in the tank to be sealed. The system also includes a motor-driven blower or other vacuum-generating device coupled to a first opening in the test plate. When the blower is activated, it generates a vacuum inside the tank of a predetermined value. A vacuum-monitoring device is coupled to a second opening in the test plate and monitors the vacuum in the tank. A leak or structural defect in the tank is indicated if the vacuum decreases from the predetermined value by more than a predetermined differential within a predetermined time.

Abstract: A device for connecting to, lifting at a first location load support surface, moving, inverting and releasing at a second load support surface individual heavy loads. The device includes a support frame for carrying heavy loads. The frame carries a mechanism for selective and controlled connection to and selective and controlled detachment from individual heavy loads, such as concrete molds with or without concrete in the molds. A lifting mechanism for providing selective and controlled vertical upward and downward movement to the connection mechanism and to any individual heavy load carried by the connection mechanism is associated with the connection mechanism. A mechanism for providing selective and controlled rotational movement of at least about 180.degree. to the connection mechanism and to any individual heavy load carried by the connection mechanism is also associated with the connection mechanism.