Work with the Batch Transfer source check

The Batch Transfer source check is done if configured on the Upstream Zone tab. For more information, see Configure the Upstream Zone tab of the DRAInjector record. The check is done for each batchXfer record assigned.

When performing the Batch Transfer source check, the system does the following:

1. Determines the pending volume of fluid to pass through the Batch Transfer location that needs to be checked. Pending volume includes both volume remaining to go for the current active batch and volume of batches in the schedule.

   

   Where:

   • UVZ is UVZ(configured for DRA Injector) x flow proportion.

   • EVZ is EVZ(configured for DRA Injector) x flow proportion.

     Where:

     • Flow proportion is flow rate(this batchXfer) / Σ(flow rate all assigned batchXfer).

2. Determines which products are found in the pending volume of the given batchXfer record.

3. For each product found, it checks its DRA compatibility. A product is not DRA compatible if listed in the product definitions in the AVEVA Pipeline Operations for Liquids Common Utilities as not DRA compatible.

4. If a product is found that is not DRA compatible, a violation condition exists.

For example, consider the diagram below. The prohibited product, jet fuel, is scheduled to be metered into the pipeline at the indicated transfer location, which has a flow meter, after the active batch of gasoline completes and a scheduled batch of diesel is processed. Both diesel and gasoline are not DRA prohibited.

Values (in barrels [bbl]) for the above case are the following:

• Scheduled for jet fuel: 1000.

• Scheduled for diesel: 2000.

• Volume-to-go for gasoline: 500.

• Configured volume directly upstream of the Batch Transfer (Excluded Volume Zone): 50.

• Configured zone of concern upstream of injector (Upstream Volume Zone): 3000.

We then calculate:

• Pending volume buffer = 3000 – 50 = 2950 (single Batch Transfer, so no flow proportion adjustment needed).

• Products within pending buffer:

  • Gasoline: Already at transfer location.

  • Diesel: Interface is 500 bbl to transfer location and therefore within the buffer of 2950.

  • Jet fuel: Interface is 500 + 2000 or 2500 bbl to transfer location and therefore within the buffer of 2950.

Since jet fuel is a prohibited product within the pending volume buffer, a violation condition exists.

Note: An Advanced Logic Processor (ALP) record may be associated with each batch transfer entry. The evaluated result of the ALP record will then be used to determine whether or not the system will include the Batch Transfer's products in the upstream violation check.