If the formation of a potentially explosive atmosphere is to be expected surrounding the equipment, ATEX-zoning is mandatory according to ATEX-work Directive’ 99/92/EC. To avoid leaks leading to explosive atmospheres, 'Enhanced Tight' solutions are viable according to EN 1127-1:2019.
The DeltaV-Seal is constructed such that it maintains enhanced tightness during the lifetime due to its design, and ensures performance against leakage. By blocking leakage over time, the zones becomes negligible. By installing the DeltaV-Seal, the user of the equipment can perform a risk assessment to demonstrate the absence of any releases, and eliminate the ATEX zone.
Hazardous Areas (Potentially Explosive Atmospheres) are defined in terms of zones and safe areas under relevant IEC (for IECEx) and EN (for ATEX) standards depending on the expected frequency and duration of an explosive atmosphere being present.
A Customer's tale
A couple of years back, a refinery burned down to the ground. The refinery is now being rebuilt, and the DeltaV-Seal has been exclusively selected and specified as the only seal to be used throughout the refinery.
The engineering company responsible for designing the new refinery understood the technical capacities of the DeltaV-Seal as an Enhanced Tight solution according to the European standard EN-1127-1:2019 Annex B.3. By utilizing the Best Available Technology in conjunction with a proven Enhanced Tight sealing solution, the refinery now eliminates the old challenge within piping where flange joints typically have been defined as leakage points.