Some questions about piping

1. Must the branch pipes for steam and condensate pipelines, nitrogen pipelines, vent pipelines, and vacuum pipelines be connected to the top of the main pipe? I’m a bit confused about this question – what does a condensate water pipe refer to? ? Steam pipes, nitrogen pipes, and vacuum pipes – generally, their branch pipes are connected to the top of the main pipe ； 2. The diameter of the equipment outlet should be larger than that of the pipe connected to it. When using elbow fittings, can these fittings be connected directly to the flange on the equipment outlet, or is a straight pipe section required in between? Under normal circumstances, it is best not to connect directly with mismatched sizes to the device port ； 3. Are there any specific requirements regarding whether the branch pipes of the circulating water system should be connected above or below the main pipe? Depending on your own usage of the process, there are no specific requirements for this ； 4. Are there any specific requirements regarding the length of the straight pipe section between two butt-welded fittings on the same pipeline (for example, the length of the straight pipe section between two tees)? It is generally advisable to leave a distance of around 15 cm between two welds. The above is purely my personal opinion

A condensate pipe is a pipe that collects the condensate water from steam. Also, large and small ends are generally not connected directly to the device ports – are there any specific specifications for this? Due to space constraints in my piping layout, some tees need to be connected directly to the equipment outlets. I would appreciate advice from experienced colleagues in this field; thank you.