Курсовая работа по дисциплине: Инжиниринг кип
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1.5 Activation pointsThe activation points for ESD systems should be systematically arranged to provide optimum availability and afford adequate protection to the facility. The following guidelines should be considered: - The activation points should be located a minimum of 8 m (25 ft) away from a high-hazard location but not more than 5 min away from any location within the facility. Five minutes is taken as the maximum allowable time, since historical evidence indicates process vessel rupture may occur after this period from flame impingement. If risk analysis calculations demonstrate a longer time period to vessel rupture, longer time periods may be acceptable. - The chosen locations should be preferably upwind from the protected hazard. Downwind sites may be affected by heat, smoke, or toxic gases. - They should be located in the path of normal and emergency evacuation routes from the immediate area. In an emergency situation, personnel may immediately evacuate and not activate emergency controls if they are located in an inconvenient location. - Locating sites furthest from the sources of largest liquid holdups or highly probable leakage sources (i.e., the relatively higher hazards) is preferred. - They should be located near other emergency devices or equipment that may need utilization during an incident (i.e., deluge activation valve(s), firewater monitors, manual blowdown valves, etc.). - The main access into the affected area should not be impaired. Location of activation points in normal vehicle or maintenance access routes will affect operations and will eventually cause the device to be damaged or relocated. - The activation point should be mounted at a height that is convenient to personnel. The ergonomics of personnel access to emergency controls should be accommodated. - Manned control rooms should always be provided with hardwired ESD points located on the main console, easily accessible to operators. жүктеу/скачать 2,11 Mb. Достарыңызбен бөлісу:
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