What standards specify that double valves and 8-shaped blind flanges must be installed in the utility service inlet area? What’s the use?
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What standards specify that double valves and 8-shaped blind flanges must be installed in the utility service inlet area? What is the purpose of setting it this way? Are there any other necessary settings that are missing? ? As shown in the figure:
Prevent internal leakage of the valve and cross-contamination of media.
These are two questions: 1. Why is a blind plate used, as shown in the figure below? 2. Why is the dual-valve + blind plate configuration adopted? This is the result of optimized design choices made from the perspective of process safety in recent years; there is also another configuration, namely “dual valves with one drain”.
HG-T 20570.23-95 Installation of blind plates