Honeywell Enraf Operation Manual page 62

4-20
Calibration
CPLp = Correction for effect of pressure on liquid (water)
= 1/[1-(0.0000032*Pp)]
WDz = Average of all WD's
= [@sum (WDz Fill 1..WDz Fill5)]/n
WDzb = Volume of Prover at 60 deg F and 1 atm
= WDz/(CPSp * CPLp)
Gravimetric Water Draw Calculations
Gravimetric Water Draw technique is completed in accordance with API
4.9.4. Volume correction factors are based on API Manual of Petroleum
Measurement Standards API chapters,: 4.2, 4.9 and 12.2.4.
Corrections and representations:
Given:
Td = Temperature of detector bar. (deg F)
Tp = Temperature of prover. (deg F)
Ta = Temperature of ambient air. (deg F)
Pp = Pressure in prover. (psig)
Ww= Weight of water. (grams)
h = Elevation above sea level. (feet)
Dtw= Density of test weights. (gm/cc)
Ga = Area coefficient of expansion for flow tube. (API 12.2.4)
Gl = Linear coefficient of expansion for detector. (API 12.2.4)
E = Modulus of elasticity for flow tube material. (API 12.2 Appendix A)
WT = Thickness of flow tube wall. (inches)
ID = Diameter of flow tube. (inches)
Calculate:
Calculation of Air Density in USC Units:
ρA = 0.001223068*(1-(0.032 x h/1000))*(519.67/(Tf + 459.67))
ρA is the density of air (gm/cc) (Per API 4.9.4)
Where:
h is the elevation above sea level (ft)
Tf is the test temperature (°F)
Calculation for the Correction for Air Buoyancy on Weighing (CBW)
CBW= {[1-(0.0012/ρTWr)]/[1- (0.0012/ρTWf)]} * {[1-( ρA/ρTWf)]/
[1- ( ρA/ρFtp)]}
Where: CBW is the correction for air buoyancy on weighing,
ρTWr is the density of reference test weights (gm/cc),
ρTWf is the density of the field test weights (gm/cc) as per
certificate of traceability,
ρFtp is the density of fluid at test temperature and test
pressure (gm/cc),
ρA is the density of dry air (gm/cc)
SVP Controller Operation Manual Part No.: 44200004 - Revision 2