Precise Bulk Terminal Controls, Accurate Truck Loadout

OVERVIEWBULK TERMINALMOBILE CONTROLVIDEO/BROCHURE
Run your terminal with fast, efficient touch-screen bulk material controls
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Bulk material control system with truck loadout at Baker-Hughes plant, Shafter CABulk materials such as grain, flour, cement, flyash and fracking sand, used in the extraction of oil and natural gas, are either milled on-site or shipped to the bulk terminals in rail cars and stored in silos.  The operator then loads materials from the silos into trucks for local deliveries.  The terminal can also include bagging, blending or batching into other products.  The bulk terminal software supervises inventory, selects the silos to be filled, runs the filling conveyors and monitors progress.

In truck delivery terminals, a truck scale under the silo discharge points connects to the control system.  Alternatively, the installers mount the whole silo on load cells to become a legal-for-trade scale.  The operator monitors incoming trucks, directs them to one of the silos and manages truck loadout.  This proceeds automatically to preset weight limits.  The Baker-Hughes terminal in Shafter, near Bakersfield CA is typical.  This terminal has 12 silos of 610 tons capacity with 3 truck scales for truck loadout, each handling 4 silos.  Read about it in a World Cement Magazine Editorial.

Control System

BatchTron bulk material controller screen showing 4 of the 12 silos at Baker-Hughes Shafter.

The BatchTron bulk terminal controls use a PLC and touch screen as the operator interface. They do not need switches or lights since everything is on-screen. This eliminates maintenance issues, also making them easy to upgrade. The screen is located at the operator's desk while the PLC is located close by or in a nearby building where most of the motors are located. This eliminates long runs of power cable and reduces the control wiring to a single ethernet cable . . . Read more

When actuators are located in groups at long distances from each other, remote I/O can be positioned in the Motor Control Center or around the plant.  As a result, wiring and cost are reduced.

Variable Frequency Drives control the speeds of the rail car loadout conveyor and the bucket elevator.  Speed and other parameters are all stored in the PLC and are accessible for update from the operator’s screen with the appropriate passwords.  Other screens display data from the VFDs such as speed and motor current, useful for fault diagnosis.

Loadout and Inventory Control

The main bulk material control screens at BHI Shafter, showing silo inventory

A PC computer runs the Bulk Terminal Controls version of the BatchLink software which shows the on-hand inventory in each silo. The BatchTron truck loadout control system loads trucks by automatically opening and closing feed gates to dispense material into each compartment as required. The weight values come from the truck scales . . . Read more

The operator prints the delivery ticket once loading is complete and the software updates both the customer and inventory records.

Since rail deliveries may not have the convenience of a local rail scale, the operator must take deliveries at face value.  However, the SiloWeigh.Net system can verify the deliveries to their respective silos.  The operator updates on-hand inventory values to correct any errors. An Internet connection makes service and training possible whenever it is necessary.

Camera System

The control room at BHI Shafter, showing the camera screen on the wall.

A multiple camera system monitors incoming and outgoing vehicles plus the rail car discharge and bucket elevator discharge to the various silos. In addition, the operators use it to guide trucks under the filling socks in the silos by mobile radio . . . Read more

The latest cameras transmit data digitally via ethernet cable and ethernet switches at junction points throughout the plant.  The operator can zoom-in the large screen display on any camera for detail views.  A separate PC computer handles this operation, with a separate link via the Internet for service and updates.

This view shows the bulk material control console on left.  The inventory and SiloWeigh.Net computer are on its right, the camera display at top and scale indicators and ticket printers at lower right.

Silo Inventory

Bulk material silo displays showing trend graph of material in one of the silos.

Silo inventory is calculated from deliveries minus the truck loading amounts. The SiloWeigh.Net system can be installed on all silos to further monitor actual silo loading as a cross-check on the calculated values . . . Read more

6 to 8 sensors are installed on the walls of each 25 ft diameter skirted silo.  As a result, readings of the weight are stable to within 2% of full scale.  The local PC computer allows the operator to view two screens;  one shows the SiloWeigh.Net, display, giving the levels in the silos or a history trend graph, as seen at right.  The other shows the inventory and truck shipments, plus the weight values from the truck scales.