Questions regarding heat exchanger design
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According to Clause 6.3.5 of GB/T151-2014, when the liquid density ρv2 is greater than 9000 kg/(m·s²), the tube sheet equipped with axial inlet nozzles should be provided with anti-erosion structures. The old GB151 did not specify any requirements regarding ρv2; I would like to know what considerations led to the inclusion of this requirement in the new standard Are there also certain disadvantages to installing anti-scour plates on the axial inlet nozzles? I’m curious to hear everyone’s thoughts
The last edit to this post was made by zjq1962 on 2019-6-28 at 13:50. The 99th edition of the standards also includes requirements to prevent erosion for the axial inlet pipes in pipe systems; however, the requirements of the new standards are more reasonable. The old standards only specified at what flow rate erosion protection was necessary, while the new standards take into account the product of flow rate and density (which represents the force of erosion). It’s the same principle as using PV in the evaluation of pressure vessels. The disadvantage of an axial inlet is that it causes direct erosion of the pipe fittings (the advantage is that the pressure drop is relatively low, and it also eliminates the need for pipe box splices)
Yeah, but doesn’t that mean that if the PV2 value turns out to be relatively low, there’s no need to install a shock plate? Because I think installing a baffle at the axial inlet could also lead to uneven fluid distribution
Small, evenly spaced holes can be made in the impact plate to ensure a more uniform distribution of the fluid.