Check if the instrument air supply is normal.
检查仪表气源是否正常。
Instrument air supply shall last at least 20 minutes if the main IA system fails.
主仪表空气供应系统发生故障时，由全厂统一考虑连续提供20分钟事故仪表空气用量。
The low pressure header and each branch shall have a 6 mm minimum, non ferrous shut off valve for each instrument requiring an air supply and a compression coupling for each air purge connection.
低压头和每个分支应为6毫米，非铁关断阀在每个送风和空气净化压缩为每个连接耦合仪器最低要求。
The low pressure header and each branch shall have a 6 mm minimum, non ferrous shut off valve for each instrument requiring an air supply and a compression coupling for each air purge connection.
低压头和每个分支应为6毫米，非铁关断阀在每个送风和空气净化压缩为每个连接耦合仪器最低要求。
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