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Hi Smily,
It's not the impeller making the hammering noise, but rather the impeller compressing the water, pumping it, that is causing a strong pulsation in the copper lines, which in turn causes the lines to rattle. You might try and find the places where the lines rattle against the trailers interior, and put foam or other dampening material around it, or secure them better. The accumulator typically goes near the pump, and it's job is to store pressurized water, so it can deliver instant water pressure without the pump having to start up immediately. I believe that the water hammering suppression is almost like a pleasant side effect of the accumulator. The bladder inside it absorbs and neutralizes the water pulses, much like a shock absorber.
I hope that the accumulator installation together with securing your copper water lines inside tha trailer will make the water lines nice and quiet, so your infant will also enjoy airstreaming !
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Uwe
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