The HRD dry chemical extinguisher is designed to discharge suppressant in milliseconds to quench an incipient explosion within a process vessel or to block the propagation of flame through interconnected ductwork. It is a spherical refillable container constructed of a high strength steel alloy. It consists of a storage container, fill valve, burst disc valve assembly, safety plate, 30-inch long actuator cable and an explosive triggered actuator. A lifting ring is provided for ease of handling.