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egarant's avatar
egarant
Explorer III
Oct 10, 2022

Proper Accumulator Tank Pressure

Hi,

I have a Shurflo 4008-101-E65 that shows a shut off at 55 psi and a restart at 40 psi.

I have a Shurflo 182 accumulator tank, that if I am correct, should be set at 40 psi. That seems rather hight to me, I believe it is shipped with 20 psi.

I've had them in the past but never paid attention to the proper psi, I just installed them as they came.

Can anyone clarify this?

Thanks,
Eric
  • egarant's avatar
    egarant
    Explorer III
    Oct 10, 2022
    Gdetrailer wrote:
    egarant wrote:
    shastagary wrote:
    ACCUMULATOR TANK: Model 182
    INSTALLATION MANUAL



    Thanks, but I do have those manuals, I'm interested in what the proper set pressure...


    Egads man, don't be so lazy, read the manual!

    From the manual that was linked above (took me a whole 2 seconds to find the info)..

    "RV/MARINE APPLICATIONS WITH PRESSURE SWITCH-CONTROLLED PUMPS
    The accumulator contributes to longer pump life, less noise, less amperage draw, and reduced water pulsation.

    The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump’s pressure switch “turn
    on” setting.

    Typically, a 45 psi [3 bar] pump will turn on around 30 psi [2.07 bar]. Therefore, the pre-charge should also be 30 psi [2.07 bar]. The pre-charge MUST be set in a “static” condition (pump off and at least one water fixture opened).

    Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about
    2 to 4 oz. [60-120 ml]. If accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."

    Simply put, find the TURN ON pressure of YOUR pump, set accumulator pressure to the TURN ON pressure of YOUR PUMP.

    Is that clear enough?


    I read the manual, I even quoted the one part of the manual that I had a question on....is the RESTART pressure the same as the Turn on Pressure?

    That's all.....
  • Gdetrailer's avatar
    Gdetrailer
    Explorer III
    Oct 10, 2022
    egarant wrote:
    shastagary wrote:
    ACCUMULATOR TANK: Model 182
    INSTALLATION MANUAL



    Thanks, but I do have those manuals, I'm interested in what the proper set pressure...


    Egads man, don't be so lazy, read the manual!

    From the manual that was linked above (took me a whole 2 seconds to find the info)..

    "RV/MARINE APPLICATIONS WITH PRESSURE SWITCH-CONTROLLED PUMPS
    The accumulator contributes to longer pump life, less noise, less amperage draw, and reduced water pulsation.

    The most efficient use of the accumulator occurs with the pre-charge set at the SAME pressure as the pump’s pressure switch “turn
    on” setting.

    Typically, a 45 psi [3 bar] pump will turn on around 30 psi [2.07 bar]. Therefore, the pre-charge should also be 30 psi [2.07 bar]. The pre-charge MUST be set in a “static” condition (pump off and at least one water fixture opened).

    Depending on pre-charge pressure to the accumulator, in relation to the pump turn on/off pressures, stored liquid is about
    2 to 4 oz. [60-120 ml]. If accumulator tank pre-charge exceeds pump turn on pressure, the liquid volume is reduced."

    Simply put, find the TURN ON pressure of YOUR pump, set accumulator pressure to the TURN ON pressure of YOUR PUMP.

    Is that clear enough?

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