Amine Drain System.
The drain system of amine unit is a closed system, where each drain line is tied into an underground pipe header, which flows into the Amine Drain Vessel. The system, from the piping, equipments and instrumentations, is hard piped and freely drained into Amine Drain Vessel.
The Amine Drain Vessel is located in the sump pit as the TEG Drain Vessel. The Amine Drain vessel is designed to store the entire liquid inventory of amine system. The vessel is constructed from CS lined with 3 layers epoxy lining and equipped with fireproofing insulation to anticipate pool fire condition in emergency case.
To prevent degradation of the solvent by air ingress, fuel gas blanketing is provided to drain vessel controlled by PCV-A, set at 0.27 barg and PCB-B set at 1.75 barg to release gas in case of built-up pressure at the vessel is maintained at about 0.1-0.3 Barg.
As the pit is open, rainwater could accumulate in the pit. Sum drain pumps are provided to pump the rain water out from the pit.
The drained solution is collected in the sumps provided at the following points where potential leakage or spillage is considered.
When amine solution liquid level is too high, the amine solution can be pumped back to the Amine Surge Vessle with the Amine Drain Vessel Pump.
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