A strange question

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Recently, the workshop assigned me to prepare a plan for improving the workshop’s utility systems. One issue involved is the pressure buildup at the outlet of the chilled brine; therefore, I considered connecting the brine outlets of some of the existing pipes directly to the main outlet pipe. However, a question arose during my consideration. Logically, by connecting the outlet pipe of the frozen saline to a relatively thicker main water outlet pipe, the flow of water becomes smoother, and therefore the pressure at the outlet of the equipment should decrease. However, according to Bernoulli’s equation, with the total water flow rate remaining constant, the flow velocity in the main pipe is slower than that in the smaller pipes; as a result, the pressure in the main pipe is higher than that in the smaller pipes. When the pressure at the inlet of the equipment is fixed, connecting the water outlet pipe to the main pipe will lead to even greater pressure buildup. I can’t figure it out; I’m confused. Please ask an expert for guidance. Point b Point a