Bladder Tank Pressure and Tank Volume

Dear Bentley Team,

I am having confusion in input parameters of Hydropneumatic Tank.

HGL Initial =

Liquid Volume = 

Pressure (Gas-Preset) = 

For example, consider a tank that has been given a full volume of 500 L and the initial conditions pressure head is 50 m. Assume that the pre-charge pressure is 5% of the steady state pipeline pressure. (This is a number that you would know ahead of time.) So, the gas preset pressure is set to 2.5 m (50 m times 5%). In this case, HAMMER computes the 'K' constant as (2.5 m + 10.33 m)(0.5 m3) = 6.415. Since K is known now, the initial gas volume for the transient simulation after the bladder is submitted to pipeline pressure is computed as V = K/P = (6.415)/(50 m+10.33 m) = 0.106 m3 = 106 L. 

By keeping above example in mind I am assigning following parameter in my calculation.

Elevation = 200m (Tank Location) Steady state pressure 10 bars

HGL Initial = (200+100) =300

Liquid Volume (initial)= 200L (?)

Tank Volume = 500L  (Assume)

Pressure (Gas-Preset) = 5m (5% of Steady State Pressure)

Please correct me if my calculation is wrong.

Regards,

SA

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