Expansion vessel pre-pressure............information please

Here's what I do. Turn on a tap, run water through until the accumulator is full. Note that the pump is running continuously. Start pumping with the bicycle pump. The water pump will begin to switch off for brief periods as the accumulator begins to work. Eventually, as you pump too much, the effect of the accumulator will be lost when its diaphragm comes up hard against the base of the unit. Back off pressure by releasing air from the valve until the water pump 'off-time' is maximised. If necessary, fine tune by pumping gently with the bicycle pump.

Using this method is simple and straightforward and fine-tunes the pressure for your system. It also has the advantage that you don't need to convert psi to bar or inches of mercury or anything else /forums/images/graemlins/wink.gif
 
<<<< 1 bar = 14.5037738 pounds per square inch >>>

This post takes the PBO prize for most useful thread contribution of the season. It would have taken the all-time record if only you had gone to more than seven places of decimals.
 
Yeah, but you only used meaningless units giving a meaningless answer /forums/images/graemlins/confused.gif
You can only use "bar" without an "a" or a "g" if you are talking about pressure differential OR if the difference between the two is negligible (e.g the difference between 100 bara and 100 barg is for most purposes unimportant) - it's certainly NOT negligible when one possible interpretation is twice the pressure of the other.
 
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