reguladores gascat

2.2. Gas flow speed
Other main factor to be considered in the calculation of the pressure regulators diameters is
the “speed of gas flow”.
To move the cursor from window to window, to use the “tab” key.
Screen for a new register:
Formula:
Calculation method of the inlet and outlet ND based on speed
∅ ²= 353,7 x Q x T x Pr
V x Tr x P
Where:
∅
V
Q
T
P
T R
Pr
Nominal diameter (mm)
Speed (m/s)
Gas Flow (m³/h; Nm³/h; Sm³/h)
Gas temperature (Kelvin)
Minimum gas pressure (kgf/cm²)
Reference temperature (Kelvin)
Reference pressure (kgf/cm²)
There are values usually considered as standard speed limits for several inlet and outlet NDs of
pressure regulators, as follows:
Speed Limits at the Regulator Input (m/s)
Up to 2" 100
2.1/2" to 4" 85
6" to 8" 75
10" to 12" 60
Speed Limit at the Regulator Outlet: 150 m/s
3. Program Usage:
3.1. “Data Input Screen”
For a new register click on the "+" key.
By doing so, the data entry windows are
cleaned and become ready to be filled
out with new data.
Where:
Project: May be used as a reference for the customer name identification.
User: May be used as a reference for the application identification.
P1: Maximum and minimum upstream pressure
P2: Maximum and minimum downstream pressure
To select the calculation
units for P1 and P2, it is
enough to click in the
drop-down button next
to each item:
Gcalc Program Manual - Page 2 of 6