Client: Exxon

Location: Santa Barbara Channel - Offshore CA, USA

Scope: Project Management and Control Support, Engineering (Detailed Design), Procurement, Construction Management Services

Status: Completed 1998

Santa Ynez Unit - Heritage Sales

Gas Pipeline

Santa Barbara Channel - Offshore CA, USA

Details:• Brown & Root’s scope included optimization studies to define the pipeline, risers

and topside facility requirements; assistance in development of the Design Basis Memorandum; and integration of designs and interfaces between project seg-ments.

• Also coordinated with Exxon on technical and operational issues; developed and updated specifications; provided project management and control support; provid-ed permitting support leading to the detail engineering, as well as cost estimating, procurement and construction management services for the export of sales gas from the Heritage platform to the Harmony platform.

• The scope of work led to the design of the Steel Catenary Riser (SCR) in the seismically active area and the associated tapered joint assembly and fatigue life calculations. The SCR is supported by a riser support structure and protected by a riser guard.

• The Vortex Induced Vibrations are suppressed by the use of strakes. The design included a pig launcher on Heritage and receiver on Harmony with the associated piping, controls and instrumentation.

• The recommendation was made to install a 12-inch diameter, 0.625” wall thick-ness pipeline between Heritage and Harmony.

• The pipeline was pulled up the existing J-tube on Heritage in 1,080 feet of water, laid across the seabed reaching depths of 1,300 feet and then became an SCR from the seabed at about 1,245 feet up to the riser support structure at the + 15 foot level on Harmony.

Continued on following page

Client: Exxon

Location: Santa Barbara Channel - Offshore CA, USA

Scope: Project Management and Control Support, Engineering (Detailed Design), Procurement, Construction Management Services

Status: Completed 1998

Santa Ynez Unit - Heritage Sales

Gas Pipeline

Santa Barbara Channel - Offshore CA, USA

Details: • Harmony Platform – Water depth: 1,200 ft – Deck weight: 9,839 tons – Total weight: 69,920 tons – Fabricated: Korea – Number of well slots: 60 – Distance from land: 6.4 miles• Heritage Platform – Water depth: 1,075 ft – Deck weight: 9,826 tons – Total weight: 60,556 tons – Fabricated: Korea – Number of well slots: 60 – Distance from land: 8.2 miles

Details: • Harmony and Heritage platform injection gas compressor capacity was increased from

55 to 67 mmscfd.

•Water treating capacity was expanded from 33,700 to 60,400 bwpd.

•Water disposal pipeline increased from 33,700 to 92,600 bwpd.

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Heritage Harmony