This invention is a safety blinding device that includes a body and bolt clamps for blinding pipes. The body includes a plate and extensions that extend radially from the plate. Preferably, there are three extensions that define three angles between each other, with two of those angles measuring approximately 132 degrees and the third angle measuring approximately 96 degrees. The angle measurements enable the device to be used with any standard pipe flange having a multiple of four bolt holes by ensuring that the extensions will fall between the bolt holes. The plate is preferably sized to completely cover the raised face of the pipe flange, thereby completely covering the pipe flow passage. One bolt clamp is included for each extension. Each bolt clamp is releasably mateable to its corresponding extension, preferably by way of a threaded bolt and hole mechanism. Each bolt clamp also includes a sliding clamp mechanism, which extends and retracts so that it clamps to the inside surface of the pipe flange. With each bolt clamp clamped to the pipe flange inside surface and with the plate covering the pipe flow passage, the safety blinding device is secured to the pipe. In the preferred embodiment, the device also locks the bolt clamps together to prevent the inadvertent removal of the blinding device from the pipe.