A newspaper report stated that in a pharma company, sparks fell from a capacitor when two electricians were on the job. The sparks fell on the nearby solvents and chemicals, leading to fire and burn injuries on face and arms of the two electricians.
Safety norms say that ignition sources should not be present atleast 15 m around the flammable storages. Though this is applicable for hot works, the same logic can be extended for storage of flammables also. It is likely that sparks can fly along the wind and can cause fire. The solvent storage area also should be provided with dyke so that leakage / spillage will not spread and are contained.
If it is not possible to remove the flammables away from ignition sources, atleast they should be covered with asbestos cloth or similar fire resistant cover; sand and other suitable fire extiniguishers should be provided near these flammable storages; fire department of the plant should be informed about the srorage and maintenance jobs proposed to be takenup; carryout hazard analysis; communicate the workers about hazards and safety measures to be taken; etc
An animated video describing the hazards during hot works in flammable areas is available at US Chemical Safety Board website (http://www.csb.gov/) and the video link is given here.