Pipe Flow Calculations Forum

Yes, it can as you will use absolute pressures in calculation

Here is report for your scenario 1: Compressible natural gas flow calculator 1. volumetric flow rate (q): q : 460.8046 ft3/min 3. length (L): L : 10000 ft 4. diameter (D): D : 2.825 in 5. density (ρ): ρ : 0.78 kg/m3 6. temperature (T): T : 288 K 9. pressure on the pipe start (p1): p1 : 64.695432 psi...

Is pump above or bellow the tank? If it is above than that might cause the problem. NPSH of the pump - Net Pressure Suction Head is pump parameter that tells how big head in front of the pump should be in order to pump work without cavitation. You should calculate head in front of the pump and compa...

When you say negative - do you mean pressure under atmospheric value?
Calculators are working with absolute pressure value so you should be able to calculate it.

You can also use pressure drop calculator and have more simple way of pressure drop in a pipe calculation

I think most of your questions can be solved using pressure drop calculator . Here is report for 100 mm 300 m long pipe Pipe pressure drop calculator 1. volume flow rate (q): q : 26.829168 l/s 3. pipe length (L): L : 300 m 4. pipe diameter (D): D : 100 mm 6. density (ρ): ρ : 1000 kg/m3 7. kinematic ...

q - is maximum flow capacity for known head loss (pressure drop), internal pipe diameter and resistance coefficient of pipe line system. So, enter head loss in - m, internal pipe diameter in mm and resistance coefficient K, and calculate maximum flow. If it is more than you have to check than relief...