Oval Gear Meters used as Fuel Monitoring Systems in Power Companies

FLOW MANAGEMENT SYSTEMS

Oval Gear Meters used as Fuel Monitoring Systems in Power Companies

Power companies lies within the the extensive fossil and hydro market. The oval gear meter plays an important role within this application. Its function serves as a crucial monitoring instrument. A generator in a power plant has a recirculating fuel supply system that provides more fuel to the injectors than is actually consumed. This results in a fuel return. The important thing to determine is exactly how much fuel is actually consumed during this process. Actual fuel consumption is determined by subtracting the return fuel volume from the supplied fuel volume. To do this, we require two oval gear meters installed within the system. One to match the flow range of the fuel supply flow rate, the other to match the flow range of the fuel return flow rate.


What Are Some Issues?

Some of the issues to consider is the need to monitor the consumption rate of the generator for a remote location. It is important to have the flexibility of being able to collect your readings more efficiently from these remote locations. Other times, we need a more accurate way of calculating service charges. This may mean more detailed records of actual use versus time.


What are the Advantages of Using a FLOMEC Oval Gear Meter in a Power Company?

Here are some advantages of installing the oval gear meter in a power company:

  • Cost savings
  • Accuracy
  • Compact size
  • Safety

Take a look at the diagram below to see the set up in such an application.

Oval Gear Meters used as Fuel Monitoring Systems in Power Companies

Solution

A pulse output to a PLC (Programmable Logic Controller) allows for communication to the remote location making your data management of these records much more convenient. Using the FLOMEC oval gear meter in this situation with data output to a PLC would mean that service charges can be based on actual amount of fuel burned during the process rather than other less accurate measures that may involve guess work or alternative conversions.


Oval Gear Meters used as Fuel Monitoring Systems in Power Companies

Programmable Logic Controller (PLC)

A PLC is a Programmable Logic Controller (PLC as is more commonly known). This is an industrial computer control sytem which monitors the state of input devices (such as flow meter with an encoder) and makes decisions based on a customised program that controls the state of the output devices (such as a valve, pump or an alarm). Many production lines, machine functions or process can benefit from this type of control system due to the added ability to change or replicate the process whilst collecting and communicating vital information. A PLC system is modular. This means you are able to vary the types of Input and Output devices that suits the application.

A Little Piece of PLC History

The first PLCs were designed and developed by Modicon as a relay replacer. These controllers eliminated the need for rewiring and adding more hardware for each new logic configuration. It increased functionality of the controls whilst much more compact in size. The first PLC (model 084) was invented by Dick Morley in 1969. The first successfull commercial PLC (model 184) was introduced in 1973, designed by Michael Greenberg.


How Does a PLC Work?

How a PLC works can be summarised in 4 steps:

  1. Input Scan, detects the state if all Input devices
  2. Program Scan, executes the custom program logic
  3. Output Scan, energizes or de-energizes output devices
  4. Housekeeping. communications with programming terminals, diagnostics etc. These continue in a loop.

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