Issues regarding steam drain volume and pipe diameter
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Is it sufficient for the pipe sizes before and after the steam pipeline’s trap to both be 1 inch? Is the water volume very low? There are specific formulas for calculating the amount of hydrophobicity. My question is this: based on these calculations, the amount of condensate in a DN250 steam pipeline can be 6300 kg/h, which is higher than the values given in the previous data sheets. Have I misunderstood something? The weight of the pipeline is simply the weight of the pipe before the steam trap – alloy steel pipes installed at intervals of 110 meters. If the calculations are correct, is the size of the condensate pipeline 2 inches? The condensate pipeline operates under gravity flow; how should the pipeline size be determined? Also, do the superheated steam pipes need to be calculated in the same way? Should fewer of them be installed? Is it only used when driving? I hope some experts can answer my questions; I’m very grateful.
Is the DN250 steam pipeline you mentioned the main pipe? The amount of condensate should be calculated based on heat consumption
Does this amount of condensation mean that all the steam in the pipe has condensed? The condensation amount can be determined by calculating the operating load of the pipeline
The water drainage capacity of pipes is different from that of equipment; for pipes, the value 20570 can be used, and the amount of condensate is calculated based on the heat dissipation of the pipes, which is generally quite small. It’s just that in my high-pressure pipeline, the pipe per unit length is quite heavy; as a result, the amount of condensate calculated during operation is large. I’m wondering if it’s possible to bypass this system to discharge the condensate while the pipeline is in use. . .
1. What is the inevitable connection between “the pipe per unit length is very heavy” and “the calculated amount of condensate is very large”? 2. Assuming that the pipe is used solely for transporting steam and no cooling equipment is installed, the heat dissipation from the pipe is related to its insulation conditions as well as the flow rate of the medium. 3. The heat dissipation per unit area can be estimated using parameters such as the thickness of the pipe insulation, the thermal conductivity of the insulation material, the ambient temperature, wind speed, and the temperature of the medium; from this, the heat loss can be calculated. By performing a heat balance calculation with respect to the steam, the amount of condensate water can be determined. 4. As for whether the amount of condensate produced is reasonable, many parameters are needed for verification, so it is not possible to make a judgment here. But I don’t understand the connection to the weight of the pipes; I can’t follow the poster’s reasoning.
You can take a look at 20570; it contains the calculation for the condensation amount while driving. It is calculated based on the weight and specific heat of the pipes and insulation, as well as the enthalpy change.
How can the heat cmΔt required for the pipe to reach its operating temperature be calculated without using weight?
Well, I also just let it go by driving now. But if it really is 6 t/h of water, would a DN25 bypass be used on-site as well?
According to what’s written in the book, it’s a hydrophobic type, and its diameter is calculated based on the maximum amount of water that can be handled
1. Upon seeing your drawings, it is recommended that the location of the water removal device be swapped with that of the bypass pipeline; otherwise, iron particles generated during use may cause blockages in the water removal device. 2. Basically, the amount of condensate formed depends, as those with prior experience have said, on factors such as the length of the pipelines, the insulation level, and the condition of the insulation, as well as the weight of the pipelines
I saw this quite late; I thought the original poster had already solved the issue. However, using it under the conditions encountered while driving is somewhat wasteful – the temperature needs to rise gradually during driving, and if the pipeline becomes unstable, a bypass is used to release pressure; it’s not all released through the drain valve.