Skip to main content
About
Calendar
Contact
Login
Search
Toggle Menu
Publications
Events
Membership
Corporate Membership
Associate Company Scheme
Testimonials
Members and Associates
Training
All Training Courses
Storage Tanks
Exams
Mechanical Integrity
Subsea Engineering
E-Learning
Search
Search
Login/Register
Basket
About
Calendar
Contact
Search
Search
Zone 21
Zone 21.
A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.