Issues with loading flow meters
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A loading pipeline has two separate feed pipes, each equipped with a flow meter and a control valve; as shown in the diagram, HV1013 corresponds to FT1006, while HV1014 corresponds to FT1005. Now, HV1013 and HV1014 are required to be interlocked such that only one of them can be in operation at a time. Meanwhile, when one pipeline is being loaded, the signal from the other flow meter must be suppressed to avoid affecting the loading process. The interlock between the on/off valve can be achieved using relays or buttons, but how can the flow meter signal be masked? And how should interlock logic diagrams be drawn?
The same. Add interlocks to the flowmeter configuration.
Is it necessary to represent it on the interlock logic diagram?
Why should traffic be interlocked? Weren’t they already controlled separately?
As I understand it, it’s possible to apply the interlock conditions to the flow meter, just like in the case of interlocked control valves; the flow meter simply does not participate in flow accumulation and recording when those interlock conditions are active. In other words, it only displays information in shielded mode without recording any data. Will this work?
The flow rates are not interlocked; rather, when one pipe is being fed, the flow meter of the other pipe remains inactive and does not display or record any values, in order to avoid affecting the measurement during loading
I feel the same way; they’re probably worried that it might affect the measurement
Looking at the diagram, it is already under separate control. If there is concern about impact, reduce the flow rate after monitoring with a flow meter. Having a loading P-controller would make control better
The logic in the diagram is incomplete; it’s not clear why the data from flow meter B affects the measurement of flow meter A. If total flow control using A and B is employed, the circuit can be separated. Generally speaking, in cases related to trade measurement, it is not allowed to disconnect the flow meter signals; after all, it’s hard to tell whether this is done to avoid interference or to steal volume measurements.
There are issues with the installation of the shut-off valves and flow meters; they should be replaced. This is supposed to be a two-set loading system, with two streams of fluid converging at one loading dipleg. In theory, no adjustments are needed – just use the shut-off valve corresponding to the loading system you want to use