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On-Shore and Off-Shore Existing Facilities

On-shore

Pipeline

The Marib to Ras Issa pipeline takes crude oil from Marib CPU to the marine export terminal and storage at Ras Issa through the 26 and 24 inch Ras Issa pipeline across the high plateau of Yemen from Marib to the Ras Issa Peninsula north of the port city of Hodeidah. The pipeline is 429 kilometers long and currently transports approximately 150,000 B/D of crude oil. Inlet pressure at Pressure Reducing Station 2 (PRS 2) in Ras Issa is approximately 1200 and outlet pressure at 120 Psig. The Maximum design flow rate is upto 400,000 B/D.
The overall Ras Issa pipeline route is depicted in the below (fig.2)

(fig.2)

Pressure Reducing Station 2 (PRS 2)

This station is required to reduce the system pressure due to the altitude change between mountainous area of Yemen and the marine terminal at sea level. The inlet pressure for the Pressure Reducing Station 2 (PRS 2)   was approximately at 1200 Psig whereas the outlet pressure was approximately 120 Psig.
More Informations on Pressure Reducing Station 2 (PRS 2) (fig.3)
 The Pressure Reducing Station 2 (PRS 2) started its operation in 13th     December 1987
 The ambient temperature of the area remains between 78 to104 degree F.
 The station has two water desalination plants (Duplex Reverse Osmosis) One has the capacity to deliver 3gal/min and the other 5gal/min. ,these operate round the clock and meets the entire clean water requirement of the station. The intake of the plant is through well/pond constructed near the shore
 The facility has two electric diesel operated generators each having capacity of 3.5 MW,FL amp:665,AC volt 380/220.3 ph 60Hz. Diesel storage tanks and daily tanks feed necessary diesel to the generators.
 Asphalt road connects the station with the main high way.
 Upstream of the Pressure Reducing Station 2 (PRS 2) is 429Km pipeline, en route has three pumping and one Pressure Reducing Station 1 (PRS 1) .
 SCADA system monitors and controls all operational activities.
 Pressure Reducing Station 2 (PRS 2) has VHF and microwave communication systems linking it with related offices.
Pictures of The Pressure Reducing Station 2 (PRS 2)
                                        (Aerial view, close in)

(fig.3)

Off-shore

SBM

Bouy Body -Technical Data

Outside Diameter

12.0 m

Inside Diameter

3.57 m

Skirt Diameter

16.173 m

Bouy Body Height

6.3 m

Bouy Body divided into

6.Compartment

Deck Manholes

Ladders(In each comartment Bouy Body Height)

1 in each

Bilge Pump

Mooring bollards

Existing SPM, located midway between shore and FSO (fig.4)

(fig.4)

 The location of SBM is Latitude 15 08.5' North and Longitude 42 36.5' East. The first unloading through SBM was affected on 25 th December 1987.
 The distance between SAFER and SBM is 1.55 nautical miles, whereas the distance between the SBM and the shore is 2.65 nautical miles.
Submarine Pipeline
The existing marine terminal operation consists of a single 24 inch sub sea pipeline which is routed from Pressure Reducing Station 2 (PRS 2)   offshore to a moored Floating Storage Offloads (FSO) in the vessel .SAFER.. Crude oil is periodically transferred from the FSO to cargo vessels berthed in at the FSO and coupled through floating cargo hoses. (fig.5)

                (fig.5)
Floating Storage Offloads (FSO)
The FSO .SAFER. is moored by a single point system that allows the tanker to rotate depending upon wind, tide and wave action. Follows is a map of the existing offshore marine terminal facilities including the location of the FSO SAFER. and the idle single point mooring system.
Basic Technical Data
Weight
(dwt) 410,000
Type
ULCC Tanker
Built
1976
Length
370
Beam
70 m
Draft
23 m

 The Floating Storage Off loads (FSO) facility, named as SAFER, started its operation at the present location on 30th March 1988 when first loading of crude oil to visiting Tanker took place
 SAFER is permanently moored at approximately 4.18 nautical miles from the shore with its Latitude 15 07' North and Longitude 42.36.5' East
 At shore, the position of pipeline connecting SAFER and PRS II is latitude 15 11' North and Longitude 42 37.8' east.
 The SAFER discharges crude oil at the rate of 50,000 bbl/hr(max)
 When tendem hose is removed for maintenance purposes, crude oil loading is performed through alongside mooring, in that eventuality the flow rate goes up as high as 100 000 bbl/hr
 The incoming pipeline from Ras Issa has been designed to deliver 400 000 bbl/day.
 SAFER is self sufficient in its electric power supply requirement, through in house turbine generating sets. Emergency generators have also been added to meet any major problem with the main Turbines.
 The annual handling of crude oil is as under:
Years
No. of Vessels Loaded
Quantities Loaded NSB
Maximum NSB
Minimum NSB
1996
87
57,063,.998
1,979,921
361,979
1997
95
59,406,131
1,917,069
240,156
1998
85
50,981,334
1,800,430
360,018
1999
83
57,085,879
1,300,045
504,006
2000
97
66,089,466
1,581,344
404,535
2001
95
60,063,224
1,407,154
199,999
2002
81
50,817,337
2,099,862
249,968
2003
82
48,943,192
1,200,021
220,074
3004
78
43,497,498
1,599,927
135,413
2005
81
49,436,563
1,094,504
113,031
Total
864
543,384,622

 The Turret is fixed in position through six Anchor chains which are 6" thick and each of chain runs a distance of approximately 440 meters (4nos.) and the end of each chain is fixed with shackle which is lowered in anchor pile, driven for the purpose.
 Most visited tanker to SAFER is Sea Express plying between Aden and Ras Issa, its round trip is approximately of 5 days. It carries 500,000 bbl of crude oil.
 SAFER is no longer handling ballast water from visiting Tanker, as these have Segregated Ballast Tanks ( SBT).