Ineos has enlisted McGrory Communications to provide media strategy support and deal with journalist enquiries. The agency's remit also includes crisis comms.
The move by Ineos comes as talks aimed at averting a strike on Sunday at the Grangemouth oil refinery in Scotland continue at conciliation service Acas.
As PRWeek went to press, workers at Grangemouth - one of the UK's biggest oil refineries - were set to take part in a two-day strike from Sunday.
The dispute centres on a disagreement between staff at the Ineos plant and management over the company's pension scheme.
This week it was reported that a filling station is charging £1.45 a litre for diesel amid fears of fuel shortages if a strike at the oil refinery goes ahead.
The Rix garage in Kirkcaldy, Fife, has raised the cost of diesel by 25 per cent, the Daily Record newspaper reported.