I have two questions regarding the plant’s steam balance diagram
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There are two issues regarding safety valves in the plant’s steam balance diagram that are not clear; I hope everyone can provide some guidance. 1. How is the total discharge capacity of the safety valves in the steam pipeline network determined? 2. Generally, two safety valves are installed on the steam pipeline network. How is the discharge capacity of these two safety valves distributed? Thank you.
1. How is the total discharge capacity of the safety valves in the steam pipeline network determined? Under normal circumstances, design institutes consider the following: the total release amount is determined based on the total amount of steam conveyed by the steam pipeline network under rated operating conditions. 2. Generally, two safety valves are installed on the steam pipeline network. How is the discharge capacity of these two safety valves distributed? If a safety valve is used with an excessively large diameter, it is generally necessary to consider using 2 or more safety valves. Under normal circumstances, if there are 2 safety valves, the discharge capacity of each valve is 50% of the total amount of steam delivered by that steam pipeline system.
Thank you for the reply. However, the plant’s steam balance diagram shows different conditions such as winter, summer, accidents, and normal operation; it seems that the design institute did not use the total amount of steam delivered as the total release amount. The set pressure of the two safety valves designed by the design institute differs slightly, and the discharge volume of each valve is also slightly different. I can’t understand it; please explain. Thank you again to everyone for participating and responding.
The discharge capacity of both sets of safety valves must meet the maximum one-time discharge capacity required by the process
If the total volume is small, it can be considered based on the total emissions; but if the volume is large, that approach cannot be used
Generally, the discharge capacity of both safety valves is calculated based on the full amount. In some processes, the pressure relief pathways for these two safety valves differ, which means their operating pressures will also vary. Those with a lower operating pressure may allow steam to flow into the pipeline system, while those with a higher pressure might discharge the steam directly. It is also taking into account the process of safe discharge