Frequently asked questions
Q:What is STP. and how do I use it in FlowCalc32 ?
A:SPT is used for Gas flow.
As gas is compressible it´s an old tradition to express gas flow at a reference condition.
The STP standard condition used by FlowCalc32 CEs is seletable by the user to apply to the standard you are using in your area. You may also select desired temperature and pressure units.
This means that values given for density and volumetric flow are expressed at your selected temperature and pressure.
By checking or unchecking the STP checkbox, FlowCalc converts values for density and flow between operating condition and at STP reference condition instantly.
This STP checkbox is checkable when media is gas and a volumetric unit is selected.
All volumetric flow units may be marked, to be at STP conditions.
Directly conversion between mass and volumetric flow units is also directly available.
Q: Why cant I see the STP selection checkbox?
A: The NPT selection checkbox will visible when media is gas and a volumetric flow unit is selected.
Q: FlowCalc gives message: Files corrupted. What shall I do to recover.
A: Older versions of FlowCalc 32 gives the message: “files corruped” when time has been manipulated, for a not registered program.
The program will be set in normal state by purchasing a license and entering the registration key. It´s only some special code required for running the trial that has been corrupted. You may recover from this state by downloading newer versions of FlowCalc32 which does not have timed out demo mode.
Q: The FlowCalc32 does not work in the one month demo mode for me. I get the error that says the clock has run out. I downloaded and installed the same day, and no go.
A: Some trial users has had problem with the time lock in FlowCalc32 version 2.02 or earlier. This message is given if the system clock has been changed more then one month after installation.
Solution: download a new copy of FlowCalc32 CE. (Version 2.03 or later)
This program may bee installed over previous versions 2.xx of FlowCalc32 CE. Uninstall the old version of FlowCalc32 CE first if you are planning to make an installation in an other disk or directory.
The latest FlowCalc32 CE programs does not use expiring trial time. Users must however purchase a license after one month trial.
Q: We checked the software and it indicates that the diameter is out of range for an specific flow. This arises a question if the values obtained are reliable, could you clarify it?
A: FlowCalc calculations conforms to ISO 5167. The standards is developed to include orifice devices with a pipe diameter between 50 mm and 1000 mm. Calculations for orifice devices with an pipe diameter between 25 and 50 mm. are also valid if you add 0.5 % uncertenty to the calculation, accordig to the standard ISO/TR 15377.
Formulas to calculate the discharge coefficient are dependent of the diameter ratio, which means that there are no jump in the in the results of calculated orifice devices with bigger and smaller pipe sizes. The warnings FlowCalc32 gives for pipe sizes means that they are outside of the scoop for ISO 5167, but they can, accordig to our knowledge, still be valid.