13 Shop Safety D. Safety Practices for Specific Hazards The following safety practices apply to Iowa State University (ISU) shops where specific hazardous materials or processes are encountered. Compressed Gases Compressed and liquefied gases pose significant chemical and physical hazards to shop users. The ISU Gas Cylinder Safety Guidelines provides additional information, including leak procedures. • Ensure gas cylinders are secured, stored away from heat sources and capped when not in use. • Ensure hazardous gas (corrosive, flammable, and toxic) quantities are below maximum allowed volumes and are stored in a ventilated cabinet when required. • Transport cylinders on freight-only elevators where possible to avoid potential exposure to passengers. • Do not ride with gas cylinders in elevators. • Use an appropriate hand truck or cart to transport gas cylinders (do not drag or roll), ensure the valve protection caps are in place, and handle only one container at a time. • Ensure proper maintenance and use of regulators, manifolds, and safety valves. • Always wear safety goggles when performing any operation with compressed or liquefied gases. Additional protection may be required based on the gases used (face shield, insulated gloves, chemical resistant gloves, and/or an apron). • After assembly of a gas supply system, test all connections using a soapy water solution or a gas detection device. Retest the system periodically and when leaks are suspected. Refer to the Compressed Gas Leak Procedure if a leak is detected. Electrical Safety Electrical voltages as low as 12-volts, can be dangerous and cause injury. When working with or around electrically powered equipment follow these general precautions: • Shop equipment must be powered by an appropriate electrical source matched to the power requirements recommended by the manufacturer. • All electrical equipment must be UL listed and have either a grounded plug (three prong) or be double insulated. • Protect electrical power cords from damage. Immediately replace cords that are worn, frayed, or otherwise damaged.