Selection of pressure nodes for flow rate limitation and pipe diameter calculation in the oxygen regulator squadron
Thread Content
The oxygen regulations state that the pressure for calculating the pipe diameter should be the lowest pressure in the piping system, while the oxygen safety regulations specify that the pressure should correspond to a reasonable flow rate. My current situation is that the pressure before the control valve is 1.5 MPa, while the pressure after the valve is 30 kPa at a flow rate of 900 Nm3/h. When the valve is fully open, the pressure before and after it is the same; the oxygen, after being depressurized, is discharged directly into the fan inlet. The question now is: should the pressure for the oxygen delivery pipeline be calculated at 30 kPa? Should it be a pipe diameter valve before the control valve at 1.5 MPa, followed by a diameter reduction at 30 kPa?
I checked the oxygen regulator manual, and it states that the pipe diameter must be designed based on the minimum pressure in the piping system. The explanation of piping systems refers to a separate set of interconnected pipes under specific design conditions. In other words, it is necessary to design the flow rate at 30 KPA based on a flow volume of 800 NM3/h.