Installation distance and location of steam traps along the steam transmission main

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Recently, I came across a set of drawings from a design firm, and I had some doubts regarding the location of steam traps in the main steam pipelines. I would appreciate it if experts could provide some guidance: 1) On the main steam network (i.e., the main pipelines), in sections with the same slope direction, steam trap devices for starting up and regular drainage should be installed every 400 meters when flowing downhill, and every 200 meters when flowing uphill. Personally, I think this is just a theoretical and very general definition ； It’s quite different from actual application. My understanding is that, whether going with the slope or against it (with the slope being preferable, of course), it is advisable to install water drainage points every 40-50 meters. 2) Bellows compensators are used for thermal pipelines. A thermal pipeline is essentially a heating pipeline; there are no requirements regarding the quality of the steam, so it doesn’t really matter. However, no information is provided regarding the compensators for the steam pipes; only bellows compensators are shown in the drawings. 3) My understanding: Since the steam pipeline uses natural compensation, a drain point should be installed at the first elbow. If this point is close to the hydrophobic points every 40-50 meters, should they be combined into one point? ! 4) The minimum diameter for the main steam pipe is 100, while that for the return pipes is uniformly 65. Is the diameter of the return pipes too small? The return pipe is larger than the main steam pipe, which facilitates the release of pressure from the condensate water and ensures smoother flow of the return water ； Now the return pipe is significantly smaller than the main steam pipe; could this lead to poor flow of return water and equipment leakage? !