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Design of dipping tube tank for horizontal or slopping downward pumping reach (Hammar)?

Hello Everyone,

I am protecting a horizontal sewage line with a dipping tube and I have some questions

1) Should the dipping tube tank base be on the ground level or can it be lowered sometimes for some reason?

2) when I tried to put it in the ground, I found during the simulation that the tank got empty -because the tank base is higher than the delivery point-and the gas volume continues increasing, is that acceptable?

3) the assigned initial gas volume--> should I calculate it using gas law, or it is assumed any value to get the pipeline protected?

I calculate it using P1V1=P2 V2

these are my calculations: 

assume total volume== 5m3

compression chamber= 3 m3

P1V1= 10.33 *3

P2= HGL-pipe invert level+10.33 

get Vi (initial volume)

assumed tank base = pipe invert +3

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4)when I lowered the tank-->  I found the gas in tank is under negative pressure during simulation what could be the reason?

thanks in advance