KROHNE Summit 8800 Vol 2 - Manual (Page 168)

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SUMMIT 8800 BATCHING 13
.
13. Batching
Liquid Gas Steam
In the oil industry one and the same pipes is often used to transport different products one after
the other, or batch by batch. The process to do so is called batching and is used for:
• Pipeline transfer, e.g. to refineries
• Drum filling
• Truck, train and ship loading
• Mixing applications
The SUMMIT 8800 has 5 independent batching functions for each stream plus one station batch-
ing. Batching can be continuous, until an manual or automatic switch to a new batch occurs.
Batching can also be based on transfer of a fixed volume or mass after which the batch stops,
e.g. in filling applications.
For the configuration, see the next chapters.
13 .1 General
Figure 188 Batching general selection
Preset batch type The method used for
batching:
Explanation
None No batching used
Fixed Batching based on fixed quantity to be
transported
Continuous Continuous batching, flowing until an
event occurs
Preset batch measurement Volume or mass batch based measurements
Volume USC or Metric
Mass USC or metric
Fixed batch information
For fixed batching it is often wise to slowly open and close the valve to prevent hammering, dam-
aging the pipe or meter. For this a PID flow control valve is used to ramp up and down. On top
of this often a preload is used to fill the pipe and an afterload is used to be able to stop the flow
accurately. This gives a following diagram: