If anyone has knowledge of NFPA 69, I would appreciate input on the following: NFPA 69:3-3.1 states that if automatic instrumentation with safety interlocks are used, then the solvent vapor concentration must be below 60% of the LEL (/may be as high as 60%). What are the requirements from the interlocks (locking? Venting? Electrical disconnect? ) Thanks. John Allen
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