Management of the ship remained with Ocean Combustion Service; it was operated by Hansa Steamship Company of Bremen (Ocean Combustion Service and Vulcanus Shipping both being subsidiaries of Hansa).

For example, in 1974, Shell Oil contracted to have liquid chlorinated hydrocarbon wastes from its Shell Chemical subsidiary incinerated in the Gulf of Mexico,[8][9] and in 1977 in the South Pacific, Vulcanus disposed of more than 8 million liters of Agent Orange left over from the Vietnam War,[10] in the U.S. Air Force Operation Pacer HO.

On 4 May 1983 the old forecastle was scrapped at Lien Ho Hsing Steel Enterprise Company in Kaohsiung, Taiwan.

At the beginning of 1988, Waste Management, Inc., which had bought Vulcanus I[2] and was then operating it and another incinerator ship named Vulcanus II, withdrew a longstanding application to provide offshore incineration of toxic wastes to the US market.

It remained with Simonsen until 3 May 2004, when it was transferred, in Dakar, Senegal, to the Nigerian shipping company Kotram Nigeria Ltd. of Apapa.