Category » Program Calculation Warnings

There were 15 articles found in this category:

1. Control Valve Warnings
   Operating Like a Pump – Flow cannot be achieved: This warning occurs when a flow control valve is set to an automatic set value that is higher than what the flow would be without a control valve. The valve is operating like a pump because it has to put energy into the system to achieve t ...
2. Tank Warnings
   Liquid Being Drawn from Above the Liquid Level: This will occur if a pipe leaving the tank has a penetration set above the liquid level in the tank, and the pipe has a fluid zone that is liquid. Vapor Leaving below the Liquid Level: This will occur if a pipe leaving the tank has a penetratio ...
3. Flow Meter Warnings
   The equations PIPE-FLO uses for flow meters are from ASME Standard, Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi (ASME MFC-3M-1989) and ASME Standard, Measurement of Fluid Flow Using Small Bore Precision Orifice Meters (ASME MFC-14M-1995). Orifices Limits: ...
4. Other Common Warnings
   Pressure outside Specification Design Limit (Nodes and Demands): This warning occurs when the user has specified pressure limits in the Design Limits section of the Specification dialog box. If the pressure is greater than the design limit, the node will turn red. If the pressure is less than ...
5. Pipeline Warnings
   Velocity outside Specification Design Limit: This warning occurs when the user has specified velocity limits in the Design Limits section of the Specification dialog box. If the velocity is greater than the design limit max value, the pipe will have red arrowheads. If the velocity is less tha ...
6. No Pressure Sources Warning
   If a pressure source has not been specified anywhere within the system model the following warning will be returned when the system is calculated. In order to calculate a system and avoid this warning at least one pressure source must be specified in the model. Possible pressure source devic ...
7. Isolated System Areas
   When the status of a pipeline or device is listed as "Isolated," it means that the pipeline or device is isolated from system tanks or pressure demands (i.e. there is not an open path from a tank or pressure demand to the pipeline or device). Isolated areas of the system are colored dark gray o ...
8. Excel Run-time Error '1004'
   When attempting to import data from PIPE-FLO into Microsoft® Excel, if there are improperly named items on your Flo-Sheet a Run-time error will occur with the X-Link macro. X-Link will not support names of devices which contain a quote (") or a comma (,). X-Link uses quotations and commas ...
9. Pipe Table for the Specification is not found
   When opening design data for a pipeline, the following message appears: The Pipe Table for the Specification is not found. No changes can be made to the pipe or valves in this pipeline. This message indicates that a pipe size table is missing, and the user is not able to modify the ...
10. Numbers not entering columns
    Microsoft® has a feature within Windows under Accessibility Options called "StickyKeys" that provides the ability to change the Shift key to a toggle. This removes the need to press both the shift key and another key simultaneously. Users may inadvertantly turn on this feature by pressing ...
11. Troubleshooting Convergence Problems in Compressible
    If you are experiencing convergence problems with a PIPE-FLO Compressible model, there are several troubleshooting techniques you can employ. PIPE-FLO Compressible's network balancing calculations incorporate a number of advanced numerical solution techniques, including three penalty minimizatio ...
12. Troubleshooting Systems with Controls
    PIPE-FLO controls provide you with the ability to control your system to meet its operating requirements. Oftentimes, too many controls are placed in the system in an attempt to achieve the desired operating parameters. Inserting controls without knowing their effect on the total system can ma ...
13. Choked Flow in a Pipe
    Flow is considered to be choked when the Mach number reaches a value of 1. When a subsonic flow becomes choked, the flow rate has reached its maximum possible value - it cannot be increased even if the downstream pressure is lowered. Choking conditions in PIPE-FLO Compressible are indicated on ...
14. Overcontrolled Systems
    Overcontrolled error messages usually occur when the flow rate, either in a single system loop or in the entire system, has been overspecified. Three situations where overcontrolled errors can occur are shown below. While these three examples do not cover all of the situations where an overcon ...
15. "Percent Tolerance not achieved" Error Message
    When performing a lineup calculation in PIPE-FLO, you may occasionally encounter a "Percent Tolerance not achieved" error message. In most cases, this problem can be eliminated by adjusting PIPE-FLO's default convergence criteria. When you perform a calculation in PIPE-FLO by clicking the Calcu ...