[
  {
    "service_context": "Concentrated sulfuric acid bulk storage (93-98%)",
    "chemical": "Sulfuric Acid",
    "concentration": "93-98%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "Carbon Steel",
    "verdict": "Recommended",
    "detail": "Passivates at 93-98% H2SO4, forming a protective coating that makes concentrated acid LESS corrosive to carbon steel than dilute acid -- the standard, economical bulk-storage material at this concentration band, not a fallback.",
    "vendor_source": "General Industries Inc., ProTank"
  },
  {
    "service_context": "Concentrated sulfuric acid bulk storage (98%)",
    "chemical": "Sulfuric Acid",
    "concentration": "98%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "Generic XLPE (rotomolded, no named vendor spec)",
    "verdict": "Not Recommended",
    "detail": "ProTank: fails within 6 months of service at 98%. Never quote a generic catalog XLPE tank at this concentration.",
    "vendor_source": "ProTank"
  },
  {
    "service_context": "Concentrated sulfuric acid, under 11,000 gal and under 15 ft tall",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 98%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "XLPE + OR-1000 antioxidant surface (Poly Processing named product)",
    "verdict": "Recommended within the stated size ceiling",
    "detail": "Poly Processing's own published \"11/15 rule\": any Poly Processing tank under 11,000 gallons and under 15 feet tall is fine for sulfuric acid storage. SAFE-Tank if no secondary containment exists, IMFO if it does.",
    "vendor_source": "Poly Processing"
  },
  {
    "service_context": "Concentrated sulfuric acid bulk storage",
    "chemical": "Sulfuric Acid",
    "concentration": "93-98%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "HDLPE resin #880046 (Snyder named product, linear polyethylene, not crosslinked)",
    "verdict": "Recommended",
    "detail": "A genuinely different polymer from XLPE -- Snyder's spec and ProTank's XLPE warning are not actually in conflict; they describe different materials. Built to ASTM D1998, SG to 1.9.",
    "vendor_source": "Snyder Industries"
  },
  {
    "service_context": "Concentrated sulfuric acid bulk storage",
    "chemical": "Sulfuric Acid",
    "concentration": "93-98%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "Extrusion-wound HDPE/PP, walls to 6 inches (Houston PolyTank named product)",
    "verdict": "Recommended",
    "detail": "No molded-in stresses (the actual XLPE failure mechanism), engineered to German DVS 2205 standard. Vendor names sulfuric acid explicitly as a service it handles.",
    "vendor_source": "Houston PolyTank"
  },
  {
    "service_context": "Sulfuric acid bulk storage",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 80%",
    "temp_f_max": null,
    "equipment_category": "Storage Tank",
    "material": "FRP (fiberglass reinforced plastic)",
    "verdict": "Recommended below 80%, Not Recommended above",
    "detail": "FRP tops out around 80% H2SO4; no public resin/concentration chart exists above that -- resin selection above 80% must be engineered per-project with the vendor, not assumed from a catalog.",
    "vendor_source": "Perry Fiberglass, ProTank"
  },
  {
    "service_context": "Sulfuric acid piping and valves",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 95%",
    "temp_f_max": 175,
    "equipment_category": "Piping / Valve",
    "material": "PVDF",
    "verdict": "Recommended up to 95%, Not Recommended above 98.3%",
    "detail": "At 98.3%+ concentration, sulfuric acid carries a natural sulfur trioxide (SO3) contaminant that attacks and stress-fractures PVDF.",
    "vendor_source": "Griffco Valve (TIB2010-001)"
  },
  {
    "service_context": "Sulfuric acid piping and valves",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 95%",
    "temp_f_max": 200,
    "equipment_category": "Piping / Valve",
    "material": "Noryl",
    "verdict": "Recommended up to 95%, Not Recommended above 98.3%",
    "detail": "Same SO3 attack mechanism as PVDF above 98.3%.",
    "vendor_source": "Griffco Valve (TIB2010-001)"
  },
  {
    "service_context": "Concentrated sulfuric acid piping and valves",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 100%",
    "temp_f_max": 200,
    "equipment_category": "Piping / Valve",
    "material": "Halar / ECTFE",
    "verdict": "Recommended",
    "detail": "Independently confirmed by a second vendor: Asahi/America's own South Florida RO plant case study specified Ultra Proline (ECTFE/Halar) + DuoPro for sulfuric acid specifically while every other chemical on the job used standard Chem Proline PE.",
    "vendor_source": "Griffco Valve; Asahi/America (asahi-america-advanced-pe-piping.md)"
  },
  {
    "service_context": "Concentrated sulfuric acid piping and valves",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 100%",
    "temp_f_max": 200,
    "equipment_category": "Piping / Valve",
    "material": "PTFE, one-piece flanged construction only",
    "verdict": "Recommended if flanged; Not Recommended if threaded",
    "detail": "Threaded PTFE fails by cold-flow leakage at the joint, not chemical attack -- a mechanical failure mode, not a chemistry one.",
    "vendor_source": "Griffco Valve (TIB2010-001)"
  },
  {
    "service_context": "Concentrated sulfuric acid piping, valves, and pumps",
    "chemical": "Sulfuric Acid",
    "concentration": "up to 100%",
    "temp_f_max": 300,
    "equipment_category": "Piping / Valve / Pump",
    "material": "Alloy 20",
    "verdict": "Recommended -- most robust and most expensive option",
    "detail": "Real documented case study: a Chilean copper mine and other real installs use Alloy 20 wetted parts for concentrated sulfuric acid transfer. Not a standard catalog SKU for most pump vendors -- factor real lead time into any quote.",
    "vendor_source": "Griffco Valve; Carver Pump case study"
  },
  {
    "service_context": "Heap-leach control valve diaphragm (75/90/100 Series MIN configuration)",
    "chemical": "Sulfuric Acid",
    "concentration": "not stated",
    "temp_f_max": 100,
    "equipment_category": "Valve Diaphragm",
    "material": "ALD70 elastomer",
    "verdict": "Not Recommended above 38 C (100 F)",
    "detail": "Hard limit even when the valve body/liner material handles the chemical fine at higher temperature -- the diaphragm elastomer is the limiting material, not the body. Always verify operating temperature against the diaphragm rating specifically.",
    "vendor_source": "Netafim Mining Products catalog"
  },
  {
    "service_context": "Heap-leach control valve diaphragm",
    "chemical": "Nitric Acid",
    "concentration": "10%+",
    "temp_f_max": null,
    "equipment_category": "Valve Diaphragm",
    "material": "ALD70 elastomer",
    "verdict": "Not Recommended at any tested concentration",
    "detail": "Rated flatly Not Good even at 10% nitric acid.",
    "vendor_source": "Netafim Mining Products catalog"
  },
  {
    "service_context": "Heap-leach control valve diaphragm",
    "chemical": "Chlorine Gas / Chlorine Dioxide",
    "concentration": "any",
    "temp_f_max": null,
    "equipment_category": "Valve Diaphragm",
    "material": "ALD70 elastomer",
    "verdict": "Not Recommended",
    "detail": "Netafim's own catalog identifies the fix: order the valve with Hastelloy wetted components instead, explicitly because Hastelloy resists chlorine gas, hypochlorite, and chlorine dioxide solutions.",
    "vendor_source": "Netafim Mining Products catalog"
  },
  {
    "service_context": "Leaching Control Skid manifold (gold/silver circuit)",
    "chemical": "Barren Cyanide Solution",
    "concentration": "not stated",
    "temp_f_max": 100,
    "equipment_category": "Skid / Manifold",
    "material": "Polypropylene + SST316",
    "verdict": "Recommended",
    "detail": "Real, named dual-chemistry rating -- the same skid family is rated for both major heap-leaching chemistries (copper SX/EW raffinate and gold/silver cyanide).",
    "vendor_source": "Netafim Mining Products catalog (Leaching Control Skid)"
  },
  {
    "service_context": "Leaching Control Skid manifold (copper circuit)",
    "chemical": "Raffinate Solution (copper SX/EW)",
    "concentration": "not stated",
    "temp_f_max": 110,
    "equipment_category": "Skid / Manifold",
    "material": "Polypropylene + SST316",
    "verdict": "Recommended",
    "detail": "Rated to 110 F for raffinate service specifically.",
    "vendor_source": "Netafim Mining Products catalog (Leaching Control Skid)"
  },
  {
    "service_context": "Leach-circuit slurry transfer, general",
    "chemical": "Abrasive Leach Slurry",
    "concentration": "n/a",
    "temp_f_max": null,
    "equipment_category": "Pump",
    "material": "Centrifugal (any material)",
    "verdict": "Not Recommended",
    "detail": "Centrifugal pumps fail via seal degradation in abrasive slurry service, regardless of wetted material.",
    "vendor_source": "existing rule abrasive-slurry-no-centrifugal"
  },
  {
    "service_context": "Leach-circuit slurry transfer, general",
    "chemical": "Abrasive Leach Slurry",
    "concentration": "n/a",
    "temp_f_max": null,
    "equipment_category": "Pump",
    "material": "Electric diaphragm pump (Graco QUANTM)",
    "verdict": "Recommended",
    "detail": "Seal-less, self-priming, runs dry, removes the failure mode that kills centrifugal pumps in this duty.",
    "vendor_source": "existing rule abrasive-slurry-no-centrifugal"
  },
  {
    "service_context": "Abrasive, solids-bearing leach solution transfer/dosing",
    "chemical": "Leach Solution (acid or cyanide)",
    "concentration": "n/a",
    "temp_f_max": null,
    "equipment_category": "Pump",
    "material": "Peristaltic / hose pump (Graco SoloTech or ProMinent DULCOFLEX), CSM/Hypalon hose",
    "verdict": "Recommended",
    "detail": "Hose-only wetted path -- no check valves, seals, or glands in the fluid path -- the correct architecture for abrasive, solids-bearing streams. Two independent roster vendors now confirm this architecture.",
    "vendor_source": "Graco (existing case study); ProMinent (prominent-mining.md)"
  },
  {
    "service_context": "Abrasive slurry isolation / shutoff",
    "chemical": "Abrasive Leach Slurry",
    "concentration": "n/a",
    "temp_f_max": null,
    "equipment_category": "Valve",
    "material": "Knife gate valve (AVCO 6100 Series, 304SS/316SS/Hastelloy)",
    "verdict": "Recommended",
    "detail": "Beveled, polished/lapped gate specifically engineered to cut through solids and seal tighter when closed. Meets MSS-SP-81 and TAPPI TIS 405-8.",
    "vendor_source": "AVCO Valve (avco-valve-mining.md)"
  },
  {
    "service_context": "Light dewatering / dirty water only (SG ~1.05)",
    "chemical": "Light Slurry",
    "concentration": "SG ~1.05",
    "temp_f_max": null,
    "equipment_category": "Pump",
    "material": "Schurco P Series",
    "verdict": "Recommended for light slurry only, Not Recommended for heavy slurry",
    "detail": "Explicitly NOT a general heavy-slurry pump despite sharing the Schurco family name -- a real design/duty mismatch if misapplied.",
    "vendor_source": "existing rule schurco-p-series-light-slurry-only"
  },
  {
    "service_context": "Combined corrosive + abrasive leach-circuit brine slurry",
    "chemical": "Leach Circuit Brine Slurry",
    "concentration": "n/a",
    "temp_f_max": null,
    "equipment_category": "Strainer",
    "material": "Glass Ceramic Matrix Composite (Fluidtrol)",
    "verdict": "Recommended",
    "detail": "Seamless-cast fiberglass/ceramic/vinyl ester matrix engineered for the case where a fluid is simultaneously corrosive AND abrasive -- PVDF solves corrosion, not abrasion; hardened alloys solve abrasion, not broad chemical resistance.",
    "vendor_source": "existing rule combined-corrosion-abrasion-glass-ceramic-strainer"
  }
]