Abstract: There is disclosed a safety system for stoppers and bungs. In particular, there is disclosed a stopper safety system for stoppers (50) for pipes (60). The stopper safety system includes a housing (30) configured for attachment to a stopper. The housing is adapted to hold a pressure sensor and a transmitter. The transmitter is positioned in the housing such that the transmitter abuts a first end of the stopper. The stopper safety system also includes a receiver (20) and a monitor (10). The transmitter is configured to wirelessly transmit a measured pressure from the pressure sensor to the receiver (20) and the monitor (10) and the monitor is configured to display the measured pressure.

Abstract: There is disclosed a safety system for stoppers and bungs. In particular, there is disclosed a stopper safety system for stoppers (50) for pipes (60). The stopper safety system includes a housing (30) configured for attachment to a stopper. The housing is adapted to hold a pressure sensor and a transmitter. The transmitter is positioned in the housing such that the transmitter abuts a first end of the stopper. The stopper safety system also includes a receiver (20) and a monitor (10). The transmitter is configured to wirelessly transmit a measured pressure from the pressure sensor to the receiver (20) and the monitor (10) and the monitor is con figured to display the measured pressure.

Abstract: A trench shoring machine comprises front and rear frameworks movable forwardly relative to each other and a series of longitudinally extending piles arranged along each side of the frameworks and movable longitudinally and independently of the frameworks. The piles are provided with rearward extensions which are laterally spaced from side elements of the rear frameworks so that lining members may be located between said rearward extensions and said elements to shore the trench sides after advance of the piles.