Questions regarding the number of branch pipes from the hot water distribution station or return water station
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The last edit to this post was made by ljy3033 on 2017-5-11 at 14:30. In SHT3040-2012, Figure 6.5.2 (Image 2), the value of “S” refers to the total number of pipes associated with the steam distribution station; it is not the same as the actual number of pipes that originate from the distribution station (Image 3), right? For example, there are currently 21 process pipes that require heating using hot water (all are DN20 pipes). As can be seen from Image 1, the value of S needs to be calculated based on Image 2; S = 0 + 2*21 + 0 = 42. Since S is greater than 12, 42/12 = 3.5, which means 4 hot water distribution stations or return water stations are required. If 1 spare connector is reserved at each hot water distribution station or return water station, then there are (21+4) process pipelines that require heat tracing; 25/4 = 6.25, which is approximately 7. In other words, each heat tracing station has 7 heat tracing pipes connected to it. With such settings, isn’t the utilization rate of the heat tracing station very low? What do the coefficients before formulas A, B, and C for calculating the S value represent? S is referred to as the total number of accompanying pipes, but it is actually calculated as 21*2; this means it is twice the number of process pipes that actually require heating? Do the S values of 4–8 and 9–12 in Table 6.6.2 mean that each heat tracing distribution station can have a maximum of 12 heat tracing pipes?
That’s right; 21 pipes need to be insulated, but it’s not necessary to use 21 DN20 insulation pipes. In fact, one insulation pipe can provide insulation for a length of around 60 meters. In practice, depending on the length, the pipes are wrapped with such insulation pipes, meaning that one DN20 steam insulation pipe can be used to insulate several main pipes
Yes, one heat tracing station can have up to 12 heat tracing pipes with a DN15 diameter