Regarding the valve bank configuration, issues with bypass valves and single/dual isolation valves
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1. The design specifications for P&ID of HG-20559-93 specify that the unit configurations for control valves are shown in Figures 1 and 2 below. Generally, in accordance with design and process requirements, valve assemblies equipped with upstream and downstream shut-off valves, drain valves, and bypass valves are chosen. 2. The Design Code for Hydrogen Stations GB 50177-2005 specifies that globe valves and ball valves are suitable for use in hydrogen pipelines, as shown in Figure 3. 3. HG/T20570.18-95 stipulates that devices that need to be isolated during operation should be equipped with double valves; as shown in Figure 4. Therefore, in accordance with these standards, should double globe valves be used as isolation valves before and after the 12MPa hydrogen control valve, a single globe valve for the bypass valve, and a single gate valve for the drain valve? ?
Medium: Hydrogen; Pressure: 10–13 MPa; Temperature: 200–260°C. During the setup of the control valve assembly, is it necessary to use dual shut-off valves? What is the basis for this decision?
High-pressure systems require dual isolation valves
For flow meters with a pressure of 12 MPa, are double isolation valves required before and after the control valve? Is there any relevant standard for this? Thank you very much