StmEng_SPX
- Last UpdatedSep 17, 2025
- 1 minute read
- PI System
- PI Server 2023
- PI Server
Calculates the steam specific entropy as a function of pressure and quality (vapor fraction)— all variables expressed in English units. Use only for wet steam.
Format
StmEng_SPX(P, X)
Arguments
-
P
Pressure of the steam in psia. The valid range is 0.08865 to 3200.112 psia.
-
X
Steam quality (vapor fraction). Valid range is from 0.0 to 1.0.
Returns
Computed specific entropy of the steam in BTU/lbm/R or- Error digital state.
Sample Values
|
Pressure |
Steam Quality |
Entropy |
|
300. |
0.9 |
1.4188 |
|
800. |
0.9 |
1.3457 |
|
1400. |
0.9 |
1.2915 |