Trade union leaders at Unite have organised the demonstration after it emerged the engineering firm Burntisland Fabrications Ltd is facing a critical cash position, and has filed a notice of its intention to appoint administrators.
BiFab, which makes equipment for both the oil and gas industry and the renewable energy sector, directly employs some 600 people at its yards in Burntisland and Methil in Fife and Arnish on the Isle of Lewis.
But Scottish Economy Secretary Keith Brown said when contractors and subcontractors were included, 1,400 jobs were linked to the firm’s survival.
Mr Brown told MSPs on Tuesday that a “disputed payment” was the source of the company’s financial problems.
And while he accepted that is a matter for the two firms involved - BiFab and the Dutch-owned contractor, Seaway Heavy Lifting (SHL) - he said the Scottish Government would do everything in its power to help.
Speaking earlier this week, Mr Brown said: ‘’This is a contract between private companies and the issues that have arisen have been between those private companies.
“But of course, we are very interested and want to do what we can to help to try to achieve a solution.
“At root of course is the future of up to 600 people directly employed and 1,400 people in general including contractors and subcontractors.”
He added: “I do appreciate this is a very concerning time for the workforce, but this government is committed to doing everything we can to find a positive solution to this situation.”