Seeking assistance with the parameter calculation for the safety valve of hydrogen peroxide pipelines
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Now, safety valves need to be installed between the two valves in the hydrogen peroxide pipeline at the factory, to prevent explosions caused by excessive pressure resulting from the heating of residual hydrogen peroxide once the valves at either end of the pipeline are closed. But after checking many specifications, I’m not sure how to calculate the maximum flow rate through the pipes between valves under these operating conditions. Any expert who can give some guidance would be greatly appreciated! Thank you!
The maximum amount of oxygen produced by the decomposition of hydrogen peroxide in this pipe after the valve is closed
For pipeline safety valves, regarding the amount of oxygen produced by the decomposition of hydrogen peroxide, a safety valve with a minimum diameter of DN25 is generally sufficient.
That’s right; the question is how to calculate the maximum amount of oxygen that can be produced Seeking advice
Previously, others used DN15 valves, but how was that determined?
The volume of the closed pipeline is used to determine the mass of hydrogen peroxide based on its density. Just calculate the amount of O2 that has been decomposed. Even if the total amount of hydrogen peroxide is used to calculate the discharge volume of the safety valve, a very small safety valve will suffice.
1. The release conditions of the safety valve can refer to several cases described in API 521. 2. In my opinion, if we are to consider the condition that could result in the highest release, it should be a fire scenario, where the pipes heat up, the hydrogen peroxide in the solution decomposes to produce oxygen, thereby increasing the pressure. And what is ejected may contain gases and liquids, in which case two-phase flow calculations are required. 3. If fire conditions are not taken into account, it might be possible to calculate using the expansion of liquids when heated.
You’re thinking the same as me; I also plan to use fire conditions to calculate this emission amount.