The story does not end when a dangerous-goods tanker is registered and hits the road; ADR regulation requires the tank to re-prove its conformity at regular intervals. A vehicle that misses the inspection schedule cannot legally carry a load even if it is technically sound.
Three Types of Inspection
- Periodic inspection: The most comprehensive check; it includes internal and external examination of the tank, a pressure test and a functional check of the equipment. The tank's structural integrity is verified from end to end
- Intermediate inspection: A lighter check carried out between two periodic inspections; it focuses mainly on a leak-tightness test and verification that the service equipment is in working order
- Exceptional inspection: Not tied to a schedule; it becomes mandatory after any accident, fire, repair, or event that could affect the tank's safety
Tips for Inspection Readiness
Experienced fleets treat inspection not as an exam but as the natural output of the maintenance cycle. Proper cleaning and degassing of the tank interior before inspection is the first requirement; the inspection body will not enter a tank with residue. Known deficiencies in valves, cover gaskets and safety equipment should be fixed before the appointment; every defect discovered on inspection day means extra time the vehicle is kept off the road. The tank plate, previous test records and approval certificates must be presented complete.
Responsibility also continues on the manufacturer's side: a well-designed tanker is drawn with inspection access points in mind from the start. A tank that is easy to inspect is a tank that spends less time waiting over its lifetime.