High-Explosion-Proof Fire Extinguisher of Sandvik DD2710 in Norway

Norwegian underground safety regulations under the Mines Safety Regulation (Bergforskriften) and the Working Environment Act require fixed fire suppression systems on all underground drilling equipment operating in tunnels and mines. The DD2710 as a hydraulic-electric jumbo carries approximately 150–200 liters of hydraulic oil in its tank and circuits—all at high pressure and in proximity to the electrical components of the three-phase drive system and the cab electronics. The fire extinguisher system on the DD2710 is not a portable unit the operator carries; it's an automatic suppression system with spray nozzles positioned at the hydraulic tank, the power pack area, and the engine bay (on diesel-assisted variants), with a manual activation trigger in the cab.

Explosion-proof certification for underground fire suppression systems in Norwegian tunneling means the electrical triggering circuit and any electronic components in the suppression system are certified to IECEx or ATEX standards for potentially explosive atmospheres—a requirement triggered by the presence of diesel exhaust fumes and, in some Norwegian underground operations, natural methane gas from organic material in the rock mass.

DD2710 Fire Suppression System Maintenance in Norwegian Underground

Norwegian underground contractors have had DD2710 units fail Norwegian Labour Inspection Authority (Arbeidstilsynet) audits when fire suppression system pressure certificates were more than 6 months old—even when the system appeared functional. The regulatory requirement is documented certification, not apparent function. HOVOO supplies certified fire suppression system refill kits and nozzle assemblies for the DD2710 that meet Norwegian underground safety certification requirements. References at hovooseal.com.