Drawing issues
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As shown in the figure, it is a discharge tank for benzotoluene derivatives; two hot water lines are connected to the tank. The areas indicated by the arrows do not seem to be used for heating, but they probably aren’t intended either for boiling the water in the tank. I would like to ask, what is the function of this line?……
Bro, from the way it looks, this is definitely for heating hot water in a tank – there’s hot water flowing in and out; it can’t be used in a cooking tank
I also told people it was for heat tracing, but I haven’t seen the site. I said it might be because there are heat tracing coils inside the tank, but the people on site mentioned flange connections, and the drawings don’t show any heat tracing either; I’m quite confused
It might be that the mechanical engineering team was careless and failed to install internal heating pipes in the equipment, or it could be that the process engineering team did not specify this requirement clearly. However, benzene and toluene storage tanks do not require heating in ordinary areas; at least, no internal heating is needed. For steam boilers, heating elements are not installed on the equipment itself – instead, there are purging ports on the upstream pipelines. It is recommended that the person in question communicate with the process engineering and mechanical engineering teams
Do you confirm that no coil heating is required for the benzene tank in the north?
The general areas refer to those excluding the Northeast region; benzene is a toxic hazardous chemical. Insulating the outer wall of the tank with heating elements is far more effective, even if several layers are used, than installing heating coils inside the tank
The pure benzene storage tanks of our coking benzene hydrogenation unit in Shijiazhuang are all equipped with internal coil designs
The poster is referring to the waste tank for toluene; first, it is necessary to determine the composition of this waste, and then decide whether heating is required based on the local weather conditions. Those two pipelines, HWS and HWR, are undoubtedly the hot water supply and return pipes. There must be coils inside the tank, which is why they are not visible on site; it’s also possible that the coils are located near the drain outlet at the bottom of the tank.
The coil inside the tank is used for heating, similar to external heating. From the two straight lines at the bottom, it can be seen that this is a sludge discharge tank; such tanks are buried underground, and using external heating is very inconvenient in such cases. Take a look at the equipment diagram and everything will be clear.