1.1 Scope. 1.1.1 This guide applies to the design, installation, and operation of piping systems containing flammable gases where there is a potential for ignition. 1.1.2 This guide addresses protection methods for use where the pipe explosion risk is due to either a deflagration or a detonation. 1.1.3 This guide does not apply to runaway reactions, decompositions, or oxidants other than oxygen. Fee may be required