Dear all,
I have ultrasonic metering station consists of ultrasonic flowmeter,700xa gc and flowcomputer floboss 600+.
The standard value of temp. is 60F (15.6 C) but the existing is 15 C so i want to change it at flowcomputer and at Gc.if this applicable,can tou give me the steps.
Note: i want to do the same thing at pressure also...
In reply to hashem ali:
In reply to MOH:
Best Regards,
Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast
In reply to Bonnie Crossland:
Hasham,
The ISO calculations are performed using the ISO 6976 standard, and the GPA calculations are performed using the GPA 2172 report and the GPA 2145 Table of Physical constants. There are significant differences in the way the calculations are done, and will generate different values for the same composition.
It is important that the calculations that you use are consistent across the whole system (GC, Flow Computer) so that you do not create confusion because of the different results.
Which calculations you use depend on the contract that you have for the sale of the gas. This contract will define the calculations to be used, and the standard conditions for the calculations. Before making any changes in the GC or Flow Computer, it is very important that both parties of the contract (the buyer and the seller of the gas) agree to the changes, and that the changes are made at a specific time and date agreed to by all parties. changing the way the calculations are performed with the agreement of all parties is a very quick way to end up in a legal dispute.
GPA calculations use a fixed base temperature of 60DegF, and allow for different base pressures (often 14.65PSIA, 14.73PSIA or 15.025 PSIA).
ISO calucations use a fixed base pressure (101.325 kPaA) and allow for different base temperatures (often 0 DegC, 15 DegC, 15.56 DegC [60 DegF]).
Generally the base pressures and temperatures will be set up during commissioning, and will not be changed for the life of the metering system, unless there is a renegotiation of the custody transfer contracts.
Regards,
Shane
Shane Hale | Global Business Development Director - Rosemount Wireless | Emerson Automation Solutions
shane.hale@emerson.com | T +1 952 204 4737 | M +1 713 447 2839
In reply to Shane Hale: