Questions regarding production wastewater pipes in fire protection codes

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The specification requires that 7.3.3 In the production wastewater pipelines, water seals must be installed at the following locations, with the height of these seals not being less than 250 mm: 1 The drainage outlets of the enclosures surrounding towers, heating furnaces, pumps, heat exchangers, and other equipment within the process units； 2 Drainage outlets for process units, tank groups, or other facilities, as well as buildings, structures, pipe trenches, etc ； 3 On the branch pipes at the intersections of plant-wide branch pipes and main pipes ； 4 For plant-wide branch and main pipes, sections of the main pipes that are longer than 300m should be separated using water seal wells. Dear sea friends, 1. Do all production wastewater pipes, whether those without volatile combustible gases or those handling combustible liquids, require a water seal? 2. Drainage outlets for the cofferdams of towers, heating furnaces, pumps, heat exchangers, etc., within the process unit ； How to understand it? Can it be understood that water seals need to be installed at the drainage outlets of all the equipment in the process unit that generates production wastewater? 3.