user manual

TABLE4. i-3
SPSPropellant Density Equations (S/C 107 and Subsequent)
Equations for calculating SPSfuel and oxidizer densities are given below.
In order to calculate the density for fuel or oxidizer of a given load
on a particular mission using the measureddensity furnished by KSC
the following steps are necessary:
A.
Use the appropriate equation below and calculate the fuel or oxidizer
density at the given pressure and temperature of the KSC sample. This
will usually be 14.7 PSIA and 25°C for fuel, and 14.7 PSIA and 4°C for
oxidizer.
B.
Use the appropriate equation below and calculate the fuel or oxidizer
density at the final system pressure and temperature. This will
usually be 110±5 PSIA and 70±5°F.
C. Subtract the density obtained in step A from the measured density of
the KSC sample, and add this amount (may be either positive or
negative) to the density obtained from step B.
A-50 DENSITY EQUATION
PF _ [57"6095-0"058533(°C)](CF)
where: O F = A-50 density in Ib/ft 3
=C m Temperature in degrees centigrade
C F = Compressibility factor - obtain this number from the
pressure - compressibility graph on Figure 4.1-1 of
this section.
N204 DENSITY EQUATION
PO m [93.1048_0.14252(0C)](Co )
where: 00 = N20 _ density in ib/ft
°C = Temperature in degrees centigrade
CO = Compressibility factor - obtain this number from the
pressure - compressibility graph on Figure 4.1-2 of
this section.
4.1-23 SNA-8-D-027(III)REV 2