Discuss Expansion vessel pre charge in the USA area at PlumbersForums.net
Thanks so it takes awhile for the pressure to stabilise again once the pump has started? When the pump stops the pressure doesn't jump back down 0.4bar.Nothing other than the vessel being on the suction side of the pump
Could the expansion stop it falling by 0.4bar when the pump stops? I will do a sketch.This is the way its supposed to work.
If the expansion vessel is on the pump suction and near the pump, the pump suction will be at the EV pressure and the pump discharge will be at the EV pressure + the pump head. If the EV is on the pump discharge and near it then the pump discharge will be at the EV pressure and the pump suction will be at the EV pressure - the pump head.
Its recommended the EV is positioned at the pump suction as the whole system will run with a higher average head.
One would think that the pressure should fall by 0.4bar (the pump head) when it stops, can you show a sketch of layout of pump, EV and pressure gauge location?.
This would indicate that the EV is on the pump discharge and the PG on the pump suction since it drops in pressure but IMO it should rise again by the same 0.4bar once the pump stops irrespective of the static pressure, hot or cold.Can I also ask what happens to the pressure when the pump kicks in as the gauge drops by 0.4bar (ish).
It doesn't rise again after the pump stops. To does rise after the 0.4bar drop relatively quickly. Just conserned with it dropping on start up that if the system lost abit of pressure. Cold cut the boiler out on start up due to the pressure drop when the pump starts. Thanks.This would indicate that the EV is on the pump discharge and the PG on the pump suction since it drops in pressure but IMO it should rise again by the same 0.4bar once the pump stops irrespective of the static pressure, hot or cold.
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