Pipeline Network in Angola — Offshore Gathering Lines, Onshore Trunk Lines and Gas Pipelines

Angola’s pipeline network is the connective tissue linking deepwater production to onshore processing and export. Unlike major onshore petroleum provinces where vast overland pipeline grids move hydrocarbons across continents, Angola’s network is dominated by offshore gathering systems feeding a relatively compact onshore corridor that culminates at the Soyo gas processing complex in Zaire Province. The network encompasses hundreds of kilometers of subsea flowlines within individual field developments, long-distance subsea gas export trunklines, and onshore pipelines distributing processed products to terminals and power plants.

This page maps the major pipeline systems operating in Angola, their technical specifications, and planned expansions. For details on the subsea flowlines within individual field developments, see the subsea infrastructure page. For information on what happens to fluids once they reach processing facilities, see gas processing facilities.

Overview of Angola’s Pipeline Architecture

Angola’s pipeline infrastructure can be divided into three tiers:

1. Infield flowlines — short-distance subsea pipelines connecting individual wells and manifolds to FPSOs within each deepwater block. These are covered in detail on the subsea infrastructure page.

2. Inter-field and export pipelines — medium to long-distance subsea pipelines transporting processed gas (and in some cases, oil) from FPSOs to onshore facilities or between blocks. These are the primary focus of this page.

3. Onshore pipelines — pipelines on Angolan soil connecting processing plants, power stations, storage terminals, and export facilities.

The total installed pipeline length across all three tiers exceeds 3,000 kilometers, with the subsea portion accounting for approximately 80% of the total.

Offshore Gas Gathering System

The offshore gas gathering system collects associated gas from deepwater FPSOs and delivers it to the Angola LNG plant at Soyo. This network was constructed in phases as the Angola LNG project and subsequent gas capture initiatives were developed.

Block 17 Gas Export System

Block 17, operated by TotalEnergies, is the single largest source of associated gas for the Soyo plant. Gas from the Girassol, Dalia, Pazflor, and CLOV FPSOs is compressed onboard to pipeline pressure and exported through dedicated subsea gas pipelines.

The Block 17 Hub is a subsea pipeline manifold located approximately 180 kilometers offshore Soyo where the four FPSO gas export lines converge into the 24-inch trunk line. The trunk line runs along the seabed to a landfall point north of Soyo, where it connects to the onshore gas gathering network feeding the Angola LNG plant.

Block 15 Gas Export System

Gas from ExxonMobil’s Block 15 (Kizomba A, Kizomba B, and Kizomba C FPSOs) feeds into a separate gathering network. Historically, the majority of Block 15’s associated gas was reinjected for pressure maintenance, but since the early 2010s, an increasing fraction has been exported toward Soyo.

The Block 15 gas export line connects to the Block 17 trunk line at a subsea tie-in point approximately 100 kilometers offshore, sharing capacity on the final 24-inch trunk line into Soyo.

Block 32 Gas Export System

The Kaombo development on Block 32 (TotalEnergies) includes dedicated gas export pipelines from both the Norte and Sul FPSOs. Given the remote southern location of Block 32, the gas export route is longer than for Blocks 17 or 15.

Block 18 and Block 31 Gas Systems

BP’s Greater Plutonio (Block 18) and PSVM (Block 31) FPSOs export limited volumes of gas via dedicated lines that connect into the broader gathering network. Both developments were primarily designed for gas reinjection, with export capability added as infrastructure became available.

The total offshore gas gathering system has an aggregate capacity of approximately 1.5 billion cubic feet per day (Bcf/d), though actual throughput in 2025 was approximately 800-900 MMscf/d due to declining associated gas production from mature oil fields.

Block 0 and Shallow Water Gas Pipelines

Block 0, operated by Chevron in the Cabinda enclave, includes onshore and shallow-water gas fields that contribute to the feed gas supply for the Angola LNG plant. A dedicated onshore gas pipeline connects Block 0 production facilities to the Soyo plant.

The Cabinda gas pipeline traverses the Cabinda enclave and crosses into Zaire Province before terminating at the Soyo LNG complex. It was one of the first pipeline segments commissioned for the Angola LNG project, becoming operational in 2012.

Onshore Pipeline Network

Angola’s onshore pipeline network is relatively limited compared to the offshore system, reflecting the concentration of processing facilities at Soyo and the absence of a large domestic gas distribution grid.

Soyo Gas Processing Complex Pipelines

Within the Soyo industrial area, a network of onshore pipelines connects the various components of the gas processing complex:

• Feed gas header — receives gas from the offshore trunk line landfall and distributes it to the LNG plant inlet facilities
• NGL pipeline — transports natural gas liquids from the LNG plant’s NGL extraction unit to the condensate storage tanks. See condensate processing for details.
• Residue gas pipeline — delivers treated gas from the LNG plant to the Soyo Combined Cycle Power Plant (750 MW)
• Condensate pipeline — moves stabilized condensate from storage tanks to the marine loading terminal

Luanda Gas Pipeline (Planned)

One of the most significant planned pipeline projects in Angola is the proposed gas pipeline from Soyo to Luanda, the capital city. This approximately 400-kilometer onshore pipeline would deliver natural gas for power generation, industrial use, and potentially residential distribution in the greater Luanda metropolitan area (population approximately 9 million).

The pipeline would follow the Atlantic coast, passing through the provinces of Zaire and Bengo before reaching Luanda. The route has been surveyed and environmental impact assessments initiated. The project’s economics depend on the development of gas-fired power plants and industrial consumers in Luanda to anchor demand, as well as the availability of sufficient gas supply from the Soyo complex.

Crude Oil Pipeline Systems

Unlike the gas pipeline network, Angola’s crude oil transportation is predominantly handled by FPSOs that store crude onboard until offloaded directly to shuttle tankers — a system that largely eliminates the need for crude oil pipelines. However, several crude pipeline segments exist:

Block 0 Onshore Crude System

Chevron’s onshore operations in the Cabinda enclave use a network of gathering lines and a trunk pipeline to transport crude from onshore wellpads to the Malongo terminal.

Sonangol Refinery Pipeline

A short pipeline connects the Luanda crude oil terminal to the Luanda Refinery (Sonangol’s 65,000 bbl/d refinery in the Boavista district of Luanda). This pipeline transports imported and domestic crude for refining into petroleum products for the local market. For more on the Luanda terminal, see oil storage terminals.

Pipeline Construction and Engineering

Building subsea pipelines in Angolan waters presents significant engineering challenges due to deep water, uneven seabed topography, and the need to manage flow assurance issues such as hydrate formation and wax deposition over long distances.

Construction Methods

The primary method for installing subsea pipelines in Angola is S-lay using large pipelay vessels. In S-lay, welded pipe is deployed from the vessel’s stern over a stinger (a curved ramp) and assumes an S-shaped curve as it descends to the seabed. Major pipelay contractors active in Angola include:

• Saipem — operating the Castorone and S7000 vessels for deepwater pipelay
• Subsea 7 — using the Seven Borealis and Seven Oceans for pipe installation
• Allseas — providing pipelay capacity with the Solitaire and Audacia vessels
• TechnipFMC — deploying the Deep Blue and Normand Cutter for flexible pipe and rigid pipelay

For ultra-deepwater installations (beyond 1,500 meters), J-lay is sometimes preferred. In J-lay, pipe is lowered vertically from the vessel, reducing the suspended pipe span and associated stresses. J-lay was used for several gas export pipeline sections on Blocks 31 and 32.

Pipeline Materials

Subsea pipelines in Angola are typically fabricated from carbon steel (API 5L X60 or X65 grade) with external anti-corrosion coatings (fusion-bonded epoxy or three-layer polyethylene). Internal corrosion protection may include corrosion-resistant alloy (CRA) lining for sour gas service or continuous chemical inhibitor injection.

Concrete weight coating is applied to pipelines in shallow water and areas with strong currents to provide negative buoyancy and on-bottom stability. In deepwater sections, the hydrostatic pressure provides sufficient resistance to buoyancy, and concrete coating is typically not required.

Pipeline Insulation

Thermal insulation is critical for maintaining fluid temperature above wax appearance and hydrate formation thresholds. Angolan subsea pipelines use several insulation approaches:

Pipeline Integrity and Maintenance

Angola’s subsea pipeline network requires continuous integrity management to prevent leaks, ruptures, and flow assurance failures. Key integrity management activities include:

• Intelligent pigging — sending instrumented devices through pipelines to detect corrosion, dents, and wall-thickness anomalies. Smart pigs use magnetic flux leakage (MFL) or ultrasonic testing (UT) sensors.
• External inspection — ROV-based visual surveys to detect free spans (sections of pipe suspended above the seabed), scour, and marine growth.
• Cathodic protection monitoring — measuring the electrical potential of pipeline steel to verify that sacrificial anodes are providing adequate protection.
• Leak detection systems — real-time monitoring of pipeline pressure, flow rate, and temperature at inlet and outlet to detect and locate leaks using computational pipeline monitoring (CPM) algorithms.

Pipeline Incidents

Angola has experienced relatively few major pipeline incidents, a testament to the quality of engineering and construction. Notable events include:

• 2009 — a subsea gas gathering line on Block 0 suffered a leak due to external corrosion at a free span location. The line was repaired using a deepwater clamp installed by an ROV-supported dive team.
• 2017 — a flowline on Block 17 was temporarily shut in after pigging operations identified a significant internal corrosion anomaly. The affected section was replaced during a scheduled maintenance campaign.

Future Pipeline Projects

Several major pipeline projects are under consideration or development to expand Angola’s midstream capacity:

The Soyo-Luanda gas pipeline is the most impactful planned project, as it would transform Angola’s energy landscape by delivering clean-burning natural gas to the capital for power generation and industrial use, potentially reducing the country’s reliance on expensive imported diesel.

Pipeline Regulatory and Tariff Framework

Pipeline construction and operation in Angola falls under the jurisdiction of ANPG (Agencia Nacional de Petroleo, Gas e Biocombustiveis) for petroleum-related pipelines and the Ministry of Energy and Water for gas distribution infrastructure. Key regulatory requirements include:

• Construction permits — operators must obtain environmental impact assessments (EIAs), route surveys, and construction authorizations before commencing pipelay
• Design standards — subsea pipelines must comply with DNV-OS-F101 (Submarine Pipeline Systems) or API 1111 (Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines and Risers)
• Third-party access — the Gas Master Plan includes provisions for third-party access to pipeline capacity on a non-discriminatory basis, though implementation mechanisms remain under development
• Tariff regulation — pipeline transportation tariffs for gas are subject to approval by ANPG, with tariff methodology based on cost-of-service principles plus a regulated return on investment

The tariff framework is particularly important for the proposed Northern Gas Complex, where multiple gas producers will need to share pipeline capacity to reach the Soyo processing hub. Establishing transparent and equitable tariff arrangements is a prerequisite for securing investment commitment from the various block operators.

For information on how natural gas is shipped internationally after processing at Soyo, see LNG shipping logistics. For the broader context of Angola’s midstream sector, browse the full midstream section. Details on the regulatory environment governing pipeline construction permits and tariffs are available in the regulators section.