High-Sealing O-Ring of Sandvik HLX5T Rock Drill in Norway

Norwegian underground zinc-lead production at Boliden's Odda smelter supply chain and the Nyrstar Talvivaara material flows notwithstanding, the most demanding HLX5T longhole production environment in Norway is the Nussir copper deposit in Finnmark—a submarine ore body being developed where the flushing water chemistry is influenced by seawater infiltration into fractured zones. The O-ring sealing challenge for the HLX5T at this type of Norwegian coastal operation is chloride attack: seawater-contaminated groundwater carries sodium chloride at concentrations that attack standard NBR O-ring formulations through a swelling mechanism that compromises the O-ring's compression set and reduces its sealing contact force progressively over 200–300 operating hours.

The HLX5T's O-ring set covers 18–22 positions across the drifter—percussion circuit faces, accumulator port faces, flushing manifold interfaces, and control valve cartridge seals. At the positions where the O-ring contacts the flushing circuit fluid directly (flushing manifold and flushing box static seals), the chloride exposure is sustained for the full 25-minute hole duration at every production hole. At 8 holes per shift, that's 200 minutes of chloride exposure per shift—far more than any development drilling scenario.

O-Ring Compound Selection for Norwegian Coastal Mine Flushing Chemistry

Norwegian coastal production drilling operations are an emerging application as Arctic mineral development expands. HOVOO supplies HLX5T O-ring sets with position-specific compound selection for chloride-water flushing environments—PTFE-backed flushing box seals and HNBR flushing manifold O-rings alongside standard NBR for oil-only circuit positions. Full references at hovooseal.com.