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Home Africa

Three things that can go wrong at an illegal oil refinery in Nigeria

by Diplomatic Info
May 10, 2022
in Africa
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Three things that can go wrong at an illegal oil refinery in Nigeria
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The Conversation
10 May 2022, 00:39 GMT+10

Years of government neglect and unemployment in Nigeria’s Niger Delta region have given rise to a widespread industry of illegally refining stolen oil.

It is estimated that about 10% of Nigeria’s daily oil production is lost to illegal activities. That’s 200,000 barrels, worth about US$21 million per day at US$107 per barrel. The Nigerian Natural Resources Charter estimated in 2019 that crude oil theft represented an economic loss of at least N995.2 billion or US$2.8 billion annually.

Communities in the Niger Delta have long agitated against the degradation of their environment caused by multinational oil companies. After years of insurgency, the government introduced amnesty programmes for militants who chose to surrender. But those who were not rehabilitated, and other unemployed youths, resorted to illegal refinery activities to make a living.

The illegal refinery process involves heating crude oil in metal containers to make petroleum products. It ignores all environmental, health and safety procedures and can have catastrophic consequences.

On 24 April 2022, for example, an explosion at one of these refineries killed about 100 people. On 24 October 2021, another explosion killed 25.

Illegal oil refineries also discharge residue from the boiling crude into rivers, polluting wildlife habitats and disrupting the water cycle.

How illegal crude oil refineries operate in Nigeria

Petroleum refineries transform crude oil into petroleum products that can be used for economic activities such as transport, heating and power generation. They are complex and expensive to operate legally because they use a lot of energy and must comply with regulations. Legal refineries are located in industrial locations that have been carefully designed to ensure the safety of workers and the environment.

Illegal petroleum refineries are mainly located in the forest or in villages. Illegal operators break crude oil pipelines and load the stolen oil into tankers or channel it to tanks where it is boiled.

A burner under the cauldron heats the crude oil and causes it to evaporate into vapour. The vapour is then cooled to condense it into petroleum products like kerosene and diesel. Finally, the liquid products are funnelled into containers for transport and sale.

Diesel, the major product of these illegal refineries, is sold to traders and filling station owners or to middlemen with big ocean-going vessels.

The distillation process in illegal refineries is very dangerous because hydrocarbon is highly inflammable.

Three things that can go wrong

Uncontrolled heat supply at distillation units In an illegal refinery, the boiler or distillation unit is constantly supplied with heat from the burner without temperature and pressure control. The steady heat supply can overload the unit with heat. That may cause thermal stress: the deformation of material by a change in temperature. The thermally stressed boiler under high pressure could explode, releasing its highly inflammable contents into the surrounding environment. A fire could spread very quickly.

Poorly designed condensation units The illegal refineries are designed and made by artisans with little or no consideration of basic engineering design principles. A condensation unit should be designed to operate at a predefined temperature. The condensation unit of an illegal refinery is normally a water bath with immersed tubes which are encased with cement blocks.

The water cooling bath might not cool down the vapour quickly enough to form the liquid products as desired. This would cause temperature and pressure buildup. A pressure buildup beyond what the cooling tube materials can handle can result in the tubes exploding. The explosion releases highly inflammable petroleum vapour products into the environment and can cause a fire.

Exposed refined products at collection points The refined products from the condensation unit are meant to be collected in liquid form. But poorly designed condensation units don’t guarantee the total condensation of the vapour products to liquid. Vapour can therefore escape into the immediate environment. Also, the collected liquid products are volatile and can evaporate into the environment if they are not properly contained.

The combination of the escaped uncondensed products and vaporised condensed liquid products could saturate the immediate environment. The activities of workers – such as smoking and sparks from metal moving parts – could then ignite the products.

Artisanal refinery is not designed to avoid fire hazards and it lacks safety procedures to handle leakages along the process line.

Consequences

The activities of illegal oil refineries also contribute to air pollution. The burners that heat the distillation units emit large quantities of soot (carbon black). This has consequences for health. And carbon black, though not a greenhouse gas, absorbs heat from the sun when released into the air, thereby warming the environment.

The process of siphoning the crude oil from pipeline also releases natural gas (mainly methane) into the environment. Methane gas is more potent than carbon dioxide in terms of global warming and climate change, which has severe implications for countries in Africa, including Nigeria.

The untreated waste released from these illegal refineries harms wildlife habitats and the water cycle, which disrupts the growth of trees which are needed to store carbon.

Nigeria’s dependence on crude oil makes it difficult for the country to decarbonise. But the government could do more to foster other economic ventures and improve the efficiency of artisanal refineries.

Authors: Nnaemeka Vincent Emodi – Research Fellow, The University of Queensland | Chukwumerije Okereke – Professor of Environment and Development, University of Reading | Ogheneruona E. Diemuodeke – Senior Lecturer, University of Port Harcourt 

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