4.3

What is the main reason for flushing chemical equipment before maintenance?

• To change pressure inside the vessel

• To warm up the surface for painting

• To remove hazardous residues and contaminants

• To decrease electric consumption

• To calibrate sensors

Which document typically outlines the procedure for equipment flushing and cleaning?

• Safety briefing form

• Chemical safety data sheet

• General operation manual

• Cleaning and maintenance standard operating procedure (SOP)

• Invoice report

What is a key requirement before starting cleaning operations on a reactor?

• Increase the pressure

• Add more raw material

• Start the agitator

• Isolate and depressurize the equipment

• Disconnect alarms

According to labor protection laws, employers must:

• Provide free snacks

• Reduce breaks

• Avoid inspections

• Ensure safe working conditions and training

• Ignore minor injuries

Which of the following is a method of mechanical cleaning?

• Acid rinse

• Scraping with brushes

• Alkali circulation

• Steam injection

• Solvent flushing

Why should technological schemes of the equipment be reviewed before cleaning?

• To find the emergency exit

• To understand production history

• To identify all connections and potential hazards

• To plan painting works

• To track power usage

What does the Safety Data Sheet (SDS) provide?

• Equipment cost

• Information on chemical hazards and handling

• Pipe length and thickness

• Cleaning history

• Shift schedule

What is the first step in preparing equipment for flushing?

• Restart the system

• Disconnect and lock out energy sources

• Add cooling water

• Polish the outer surface

• Inform logistics team

What is the most common hazard during acid cleaning of heat exchangers?

• Equipment rusting

• Chemical burns and vapor inhalation

• Blocked sensors

• Cable failure

• Pipe insulation damage

What type of cleaning uses high-pressure water jets?

• Alkaline flushing

• Solvent rinse

• Hydroblasting

• Steam scrubbing

• UV cleaning