KROHNE Summit 8800 Vol 2 - Manual (Page 82)

82 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 STREAM CONFIGURATION 06
Isentropic Exponent
Isentropic exponent of the fluid at flowing .Options available for source
Keypad
Fixed user defined value
Method 1 From calculated Ratio specific heat γ0
AGA 10 Natural gas detailed density analysis based on speed of sound
6 .2 .3 .1 .1 Orifice Plate
The following parameters are available for this selection
Equation
Orifice equation used for flow calculation
Keypad
User defined fixed value for coefficient of discharge
ISO 5167 As per standards for 1991, 1997, and 2003 with the change of temperature to be
used.
AGA3 Calculated independently from the type of fluid with a deadweight correction factor
Tappings
Pressure taps for the orifice installed based on location where the reading is taken.
Flange
Placed both sides of the orifice close to the face plate, usual an inch either side.
Corner Pressure taps on both sides of the flange holding the orifice plate
D & D/2 Located in the pipe wall upstream and downstream of the face plate at half length.
Joule Thompson
A pressure drop and temperature change based on a regulating process in conjunction with a steady
flow across a restricted section.
Keypad
A user defined fixed value for the Joule Thomson process
Reader-Harris Simplified version of the Joule Thompson equation
ISO 5167:2003 Calculations to ISO 5167, based on temperature method.
6 .2 .3 .1 .2 Classical venturi
When selecting classical venturi as the measurement source the following parameters will need
populating.
Pressure loss
Pressure taps for the orifice installed based on location where the reading is taken.
Calculated
……..
Keypad User defined fixed value
Coefficient of discharge
A selection based on the tube installation, or defined values, as set by ISO5167 for the convergent section
of the venturi.
As cast
Machined
Rough weld
CoD table
see paragraph 6.2.3.3
Keypad
Constants
An alternative method to calculating the loss of pressure as defined the Beta
calculation.
6 .2 .3 .1 .3 Venturi nozzle