The company has written to staff at its depot in Durranhill Industrial Estate, warning that a review is underway.
It is understood that BOC, a member of the £10bn Linde Group, plans to shed 460 staff across the UK.
A spokeswoman told the News & Star: “In response to the deepening slowdown that is affecting the global economy and the UK manufacturing sector, and subsequent changes in customer requirements, BOC is carrying out a review of its operations.
“We anticipate this may result in a number of job losses which would be managed in accordance with our long-established consultation procedures.
“We regret any impact that this will have on affected employees and will seek to mitigate the impact where possible.”
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