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Fundamentals of process design for station facilities

2021-07-02 14:31:45
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1. goal

The purpose of this article is to establish the Basic Electrical System The Initial Engineering Design (FEED) and data design or standards used in collection facilities will be built. Electrical system design refers to process flow diagram and utility flow diagrams. The existing data in the flow diagram contains the equipment requiring electrical energy (in Horse Power).

Other required data is the equipment configuration plan, and therefore can be the design, such as the layout of the cable tray, the lighting configuration plan, typical installation details and take-off of the equipment. .

2. Description of the process

2.1. Cluster collector

The process takes place here, fluid derived from the wells will be transferred to the cluster manifold, each cluster having installed a manifold assembly designed to accommodate production wells with different operating pressures: high pressure, medium pressure and low pressure.

If the well is producing at high pressure, then fluid will flow into the high pressure manifold header. If the well pressure drops to medium or low pressure, fluid will flow into the medium or low pressure manifold. Test header also provided for well test purposes.

2.2. Block Station

Collector block consisting of HP Header Block, MP Block Station Header, LP Block Station Header, and Block Station Test Header. Block station header designed to support production from all wells in the cluster.

2.3 Unit separator

Separator in the washer operated to separate water and gas. A scrubber is part of the separator in order to optimize the separation of the gas separator.

The separator includes:

  1. High Pressure Separator , the fluids coming from the Block Station high pressure manifold are separated in the high pressure separator. HP gas cooled in a high pressure gas cooler then stored in a gas storage tank.
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  2. Medium Pressure Separator accommodates the two medium pressure oils produced from the high pressure separator and fluids from the Block Station medium pressure manifold manifold. The gas and water contained in the oil and fluids will be separated in a medium pressure separator. Medium pressure products will be routed to a medium pressure gas scrubber to minimize liquid residue.
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  3. Low Pressure Separator , the fluids from the medium pressure separators and the low pressure manifold manifold of the block station will be separated in the low pressure separator. The low pressure gas produced was delivered to the fuel gas group to meet the electricity needs of the relay stations.

For fluids coming from Block station, Test Header follows the same process as described in steps 1 to 3 above

2.4. Crude oil transfer pump

Used to pump oil production from the crude oil storage tank continuously (24 hours) to the final storage tank. There are 2 (two) pumps supplied which can be used alternately or at the same time.

2.6 Heating unit

The oil will be delivered to the final storage tank first heated to prevent freezing due to the drop in temperature of the oil in the pipelines. The heater equipped with a control system so that it can be turned on / off automatically based on the desired set point.

2.7 Pour point depressant injection unit

A pour point depressant will be injected to decrease the oil pour point value so that the oil blockage due to ambient temperature can be removed.

2.8. Produced water storage tank

Serves as temporary storage of produced water in the production separator. The water storage tanks operated alternately loading and unloading.

2.9 Water transfer pump

Used to pump water from temporary water storage tanks to final storage tanks. Composed of 2 (two) unit pumps that can be used alternately or at the same time.

2.10. Drain system

Closed circuit open drain system for all vessels and bulk tanks. 2 closed drain pumps (two) designed to pump liquid from container to LP separator.

All drainage water will be transferred to the sewage basin which is equipped with two (two) open oil drain pumps for pumping oil into a crude oil storage tank, while the water drain pump open is to pump water from the water compartment. Water from the open drainage system will be pumped to the production water storage tank.

3. Utility unit

Closed circuit open drain system for all vessels and bulk tanks. 2 closed drain pumps (two) designed to pump liquid from container to LP separator.

All drainage water will be transferred to the sewage basin which is equipped with two (two) open oil drain pumps for pumping oil into a crude oil storage tank, while the water drain pump open is to pump water from the water compartment. Water from the open drainage system will be pumped to the production water storage tank.

3.1. Fuel gas system

The fuel gas system includes a fuel gas scrubber, a fuel gas filter and a fuel gas heater. The gas fuel system will supply the fuel requirements for the gas generator, the system covering the pilot burner (torch).

3.2. Power supply system

Support the operation of the station block for the electric power supplied by 2 gas turbine generators. In normal condition, electrical power supplied by a gas turbine generator.

Diesel generator designed to supply electric power which is essential, such as fire alarm system, traffic control system, GTG start, etc. The standby diesel generator set will operate automatically in the event of failure of the gas turbine set.

3.3. Instrument / Utility Air System

Instrument / utility air system designed to fill the instrument air required in the installation. The air supply consists of two (two) air compressors, one utility air receiver and two (two) instrument air dryers.

A two (2) unit air compressor with electric drive motor will operate in parallel (advance / delay mode).

3.4. Raw water system

Raw water requires potable water, water service and fire water. The raw water pump will be used to pump raw water to feed the water tank. From the service water tank, the water supplied to the drinking water system and to the service water system.

3.5 Fire water system

The fire water system includes fire water basin, fire water pump, jockey pump, main fire water ring and other distribution systems, such as deluge system, spray nozzle, control device. fire monitoring, hose reel for fire hydrant.

3.6. Drinking Water Service

Clean water obtained from drinking water is stored in a drinking water tank and distributed by a drinking water distribution pump.

CONCLUSION

The process flow diagram is a basic tool for preparing the design of the electrical system and avoiding any other engineering discipline.
All the above mentioned equipment is the basic element to prepare the electrical design. Anyway, another factory has a different system and equipment.

 

 

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