TANK FARM MONITORING SYSTEM

Our system provides a passive monitoring of tank levels and valves positions.

 

LEVEL MONITORING

Each of the 12 holding tanks (1 through 13, #4 removed) are fitted with an analog level transmitter that provides volumetric information to the PLC.

The PLC processes this information and displays real time volumes of the tanks on two 15 inch HMIs that are mirroring each other (same information is displayed on both).

Local readings of the tanks volumes are provided by field installed “repeaters”.

Each of the 12 devices are housed in weatherproof housings and labeled for easy identification.

 

These instruments display volumetric information of the tank’s content, in liters.

 

In order to navigate the HMI screens, the operator needs to log in.

The HMI screens display the nominal volume (maximum capacity) of the tanks, real time content in liters and percentage, and related alarm information.

Red indicator bar at top of the tank means “High level Warning” and yellow indicator at the bottom of the tank stands for “Low Level Warning”.

Both high and low level alarms have user defined set points that can be changed in the settings screen. It does not matter which HMI is used to set/change setpoints, the new value will be reflected on both screens.

 

 

 

In addition to the tanks and their specific information, the screens display a mimic of the existing piping and the valves installed.

A high level condition (if arises) will be signaled (both audio and visual), but eventual spillage WILL NOT be prevented.

Additional screens are provided for the user’s convenience to de-clutter the view in case only specific tank(s) and/or valves are being monitored at certain times.

Each of the two HMIs can operate independently on different views without interfering.

Alarm conditions will be listed in the respective section of the screen(s) together with the time it happened.

 

 

Alarms can be silenced and acknowledged, depending on specific conditions for the respective alarms.

If the alarm condition still exists, pushing the “Reset” button will only silence the audible alarm.

Visual indication will continue until the alarm condition is rectified. In some cases this will lead to persistent visual indication of High and/or Low level condition in some tanks.

At request, the audible alarm was programmed to intermittent mode, specifically 5 “beeps” every 30 seconds until silenced.

HMIs, alarm indicators and reset buttons are installed at both requested locations (opposite ends of the tank farm inside the building).

The berm containing the storage tanks is fitted with a level sensor located at the lowest point, that if actuated will trigger a “storage containment flooded” alarm.

One red beacon light is installed outside, above the tanks to provide alarm condition indication in the field.

 

VALVE MONITORING

All newly installed valves (25) have position monitoring and open condition signaling.

When a valve in opened, locally a green indicator light will turn on as a visual feed-back.

On the HMIs, the respective valve’s symbol will change color from red to green to indicate the open condition.

Also, the respective section of the connected piping will change color to indicate possible oil flow.

When a valve is in closed position, the HMIs will display a red symbol for the respective valve, and the connected piping (lines on the screens) will change color accordingly.

The color change of the piping (lines on the screens) is dependent on ALL valves connected to the respective section of the piping.