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Despite many safety precautions within oil and gas facilities, equipment failures or operator errors can cause increases in process pressures beyond safe levels. If pressures rise too high, they may exceed the maximum strength of pipelines, vessels, and other equipment. This can result in rupturing of process equipment, causing major releases of toxic or flammable gases or liquids which can lead to injuries to people, damage to assets and the environment. Installing relief systems is the last guard to relieve liquids or gases before excessive pressures are developed. It is therefore important that the relief system is designed and sized to function correctly.