What is the difference between lock open (closed) LO(LC), seal open (closed) CSO(CSC), and normal open (closed) NO(NC)? How to choose in practice?
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As the title suggests, in recent practical work I have different opinions regarding the review and verification of the issue in question, and I’m also quite confused. I hope experts can help clarify this for me.
Lock open (close) LO(LC): it features a valve lock mechanism that requires a key to operate. The seal is opened (closed) by CSO(CSC); there is a sealing strip or relevant indicator to prevent accidental operation. Normal on (off) NO(NC) – it may be one or both of the above situations. Personal opinion: NO/NC is less specific than the two aforementioned expressions; depending on the different design stages of a project, the level of detail in the P&ID may increase gradually, resulting in more specific representations.
What is the difference between lock open (closed) LO(LC), seal open (closed) CSO(CSC), and normal open (closed) NO(NC)? How to choose in practice? In recent practical work, there were differing opinions regarding the review and verification of the issues mentioned in the question, and I feel quite confused as well; I hope experts can help clarify this.
What is the difference between lock open (closed) LO(LC), seal open (closed) CSO(CSC), and normal open (closed) NO(NC)? How to choose in practice? I wonder in what situations it is necessary to open (close) with a lead seal or unlock (lock) it? In which situation can one of them be chosen? In which cases is it sufficient to use normal on/off?
Universal Hai Chuan, the master of process systems, dear teachers – please help resolve my doubts