Valves for Naphtha (Light / Heavy Naphtha) Service
Naphtha is a broad distillate fraction of crude oil (boiling range ~30–200°C) used as gasoline blending stock, as feedstock for catalytic reforming (to make BTX aromatics), as petrochemical cracker feed, and as a solvent. Light naphtha (C5–C6) is close in properties to gasoline; heavy naphtha (C8–C12) is the catalytic reformer feedstock. Both are highly flammable (flash points below 25°C), non-corrosive to common metals, but requiring fire-safe valves and PTFE or Viton seals in ATEX-classified areas.
Pressure Range
1–35 barg (storage to reformer operating pressure)
Temperature
Ambient to 550°C (catalytic reformer)
Industries
Crude oil distillation (CDU), Catalytic reforming (BTX production), Ethylene cracker feed
Key Properties — Naphtha (Light / Heavy Naphtha)
- Flash point: −40°C to +25°C (depending on cut) — flammable, ATEX Zone 1 in process areas
- Boiling range: 30–200°C — partially volatile at ambient, generates flammable vapour
- Non-corrosive to carbon steel, SS, bronze
- Good compatibility with PTFE and Viton — poor with EPDM and NBR (swell)
- Catalytic reformer: naphtha + H₂ at 450–550°C, 15–35 barg — high-temp/H₂ service for reformer valves
Material Compatibility — Naphtha (Light / Heavy Naphtha)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Carbon Steel (WCB) | Excellent | Standard for naphtha storage, transfer, and blending. |
| SS 316L | Excellent | For process naphtha streams requiring higher corrosion resistance. |
| A217 WC6/WC9 | Excellent | For high-temperature catalytic reformer service (>400°C). |
| PTFE seals | Excellent | Best elastomer for naphtha service. |
| EPDM / NBR seals | Not Recommended | Swell in aliphatic and aromatic naphtha. |
Recommended Valves
Ball Valve (WCB, fire-safe, PTFE seat)
Standard for naphtha storage tanks, rundown lines, and blending headers
Gate Valve (API 600, WCB)
Mainline isolation for naphtha feeds to reformer and cracker
Globe Valve (A217 WC6, Stellite trim)
Control in catalytic reformer circuits at elevated temperature
Check Valve (dual-plate or swing)
Pump protection on naphtha transfer pumps and reformer charge pumps
ESD Ball Valve (fire-safe, actuated)
Emergency shutdown on naphtha storage tanks per OISD-118
Valves to Avoid
EPDM or NBR-seated valves in naphtha service
Non-fire-safe valves in ATEX Zone 1 areas
Special Considerations
Applicable Standards
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