Richard,
Re 50% water filled, I meant ? surge container filled with water only 50% and the rest is trapped air which does not escape during operation and acts as pressure absorber.
100% water filed is when container filled with water only.
According to results you mast have air in container to efficiently absorb pressure spikes, otherwise container capacity has to be greatly increased. Just got to remember that air will dissolve in water. So container will have to be regularly checked. Or alternatively proper surge arrestor mast be used which incorporates membrane which separates water from air inside container.
The water/air system good side:
Very efficient pressure spikes suppression
System pressurized all the time (ready for instant use without delay for pump start up)
Bad side:
A lot of water will be discharged in case of valve failure
Slow pressure build up on system start-up after initial water priming
The problem is that if water/air container used (which is very efficient) it will discharge a lot of water in to the engine if valve fails (your earlier comment!).
If water only container used it will discharge only very small amount of water but it is not efficient for surge suppression.
So ideally you need water/air container with bleed valve which discharges system pressure back in to the main water storage tank when engine is turned off after operation to prevent hydro lock?
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