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[R NESAMANI]

The following proposal is for LPG vent recovery from filters.

Purpose : LPG is being vented during the maintenance of Filters & Pumps. This has increased due to the pigging work.

How the system works:
Refer the diagram(LPG Vent recovery) attached.
Basket Filter will be connected with the downstream of PCV of RT-OMC, through compressor system. OMC line is always in pr of less than 10 kg/cm2.

1) LPG liquid recovery:

Isolate the basket filter. Close Valve-V1,V2 & V4; Open-V3. LPG will flow from filter(@ 20 kg/cm2) to HPCL pipeline (@ 10 kg/cm2).

Within 30 minutes, the filter pressure will come down to 10 kg/cm2. No further flow will occur.

2) LPG Vapor recovery:

Close Valve-V1 & V3; Open-V2 & V4.

LPG vapour(@10 kg/cm2 from top of the vessel) will flow from filter to compressor system. Reciprocating Compressor will evacuate the LPG vapour and discharge to the pipeline.

After discussion with the vendor, LPG compressor is selected, which can safely evacuated up to 2.00 Kg/cm2. Which is more than 90% of LPG is evacuated.
Beyond 2.00 kg/cm2, we can’t evacuate. So close Valve-V2 & Open valve-V1 for flaring.

Compressor system: (Refer the drawing & specs of the system)
Compressor system includes, the liquid trap to prevent the entry of liquid LPG into the compressor. Suction strainer.
4 Pole FLP motor rated for 1500 rpm, 7.5 HP
a)Low suction pressure switch qty- 1
b)High discharge pressure switch qty-1
c)High discharge temperature switch qty-1


Mail me your views & suggestions on this plan.

Regards

R Nesamani

Attached Files

•  LPG vent recovery system.pdf   37.64KB   19 downloads
•  IPS.pdf   15.3KB   12 downloads
•  Compressor specs.doc   138.5KB   13 downloads