Emerson Rosemount 8600D Series Reference Manual page 103

Reference Manual
00809-0100-4860, Rev BC
Permanent pressure loss
The approximate permanent pressure loss (PPL) from the Rosemount 8600D flowmeter is
calculated for each application in the Vortex sizing software available from your local
Rosemount representative. The PPL is determined using the equation:
where:
PPL = Permanent Pressure loss (psi or kPa)
Where:
= Density at operating conditions (lb/ft
f
kg/m
Q = Actual volumetric flow rate (Gas = ft
m
D = Flowmeter bore diameter (in. or mm)
A = Constant depending on meter style, fluid type
and flow units. Determined per following table:
Table A-4. Determining the PPL
Meter
Style
8600DF
Minimum upstream pressure (Liquids)
Flow metering conditions that would allow cavitation, the release of vapor from a liquid, should
be avoided. This flow condition can be avoided by remaining within the proper flow range of the
meter and by following appropriate system design.
For some liquid applications, incorporation of a back pressure valve should be considered. To
prevent cavitation, the minimum upstream pressure should be:
P = 2.9P + 1.3p
(3.45 kPa) (use the smaller of the two results)
P = Line pressure five pipe diameters downstream of
the meter (psia or kPa abs)
P = Pressure loss across the meter (psi or kPa)
p = Liquid vapor pressure at operating conditions
v
(psia or kPa abs)
Specifications and Reference Data
A  f
PPL =
----------------------------- -
3
)
3
/hr; Liquid = gal/min or l/min)
English Units
A A
Liquid Gas
-5 -3
3.4 10 1.9 10
or P = 2.9P + p
v
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Q 2
 
D 4
3
or
3
/min or
SI Units
A A
Liquid Gas
0.425 118
+ 0.5 psia
v
Appendix A: Reference Data
January 2013
95