The water well drilling rig uses standard or sulfur-resistant DTH hammers for specific needs.
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Sulfur-resistant for sulfur layers: Chrome cylinders, sulfur-proof pistons. Last 300 hours in 0.05% H₂S—2.5x standard models.
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Critical for hot springs with sulfur:
One drilled 52
℃, 80
m³/h wells.
Standard ones failed at 200m due to corrosion.
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Standard better for normal strata: 25% lower cost per meter, easier to maintain. Saves cost where sulfur is absent.
Anti-sulfur adds 30%
cost.
The water well drilling rig needs pre-surveys to pick the right type.
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