The maximum Flare Gas flow rate
…to define the required capacity of the Ejector solution.
A desirable recovery point/destination
…for the flare gas to be sent after compression through the Ejector. This determines the discharge pressure the Ejector must achieve. Typically, gas is returned to the production process at a suitable point such as a separator inlet, used as a fuel gas, or is sent down-hole.
If an existing motive gas or liquid stream is available
…(and is sufficient) to provide the motive stream to the Ejector. If not, a system can be provided which includes a dedicated pump and other associated equipment, as required.
Composition of the Flare Gas (and motive) stream.
This is considered as part of the process and mechanical design, but also ensures a suitable material of construction is selected. Transvac can manufacture Ejectors from a wide range of standard and exotic materials to suit more challenging, sour service projects.
Modes of operation and control requirements.
Some projects have defined modes of operation due to seasonal changes in process requirements, which can affect flare gas flow rates. Other expected variations in process need to be considered to ensure an appropriate, efficient control strategy can be employed. A robust control strategy is critical to Flare Gas Recovery projects, as it integrates with the important Flare safety system, so is always considered alongside a detailed HAZOP assessment. Transvac is very experienced and provides detailed support to end users in this regard. Transvac already has close working relationships with a number of flare specialists who can also provide expertise to mitigate any risks associated with the flares.