Valves for Chlorine (Cl₂) Service
Chlorine is a powerful oxidiser and highly toxic gas (IDLH: 10 ppm). Dry chlorine gas is handled in carbon steel; wet or moist chlorine attacks virtually all metals. Valve selection follows Chlorine Institute Pamphlet 6 recommendations.
Pressure Range
Up to 25 bar for liquid Cl₂
Temperature
-34°C (liquid) to 120°C (gas)
Industries
Water treatment, PVC / chlorinated chemicals, Bleach production
Key Properties — Chlorine (Cl₂)
- Dry Cl₂ (gas or liquid): carbon steel is acceptable
- Wet Cl₂ (>50 ppm moisture): attacks carbon steel rapidly
- IDLH (immediately dangerous to life): 10 ppm
- Strong oxidiser — PVC and PTFE preferred for lining
- Chlorine reacts violently with hydrocarbons and ammonia
Material Compatibility — Chlorine (Cl₂)
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 (dry service) | Good | Acceptable for dry chlorine gas and liquid. Passivates with iron chloride layer. |
| SS 316L | Fair | Wet chlorine — not recommended due to Cl-SCC. Dry service — acceptable. |
| Hastelloy C-276 | Excellent | Best all-round choice for both wet and dry service. |
| PTFE | Excellent | Completely inert. Preferred for seats, seals, and lining. |
| PVC / FRP | Good | For wet chlorine at low pressure. |
| Monel 400 | Good | Good for dry chlorine; not for wet. |
| Copper alloys | Not Recommended | Attacked rapidly. |
| Titanium | Poor | Risk of titanium-chlorine fire at elevated temperature. |
Recommended Valves
Carbon steel gate/globe valve (dry Cl₂)
Chlorine Institute Pamphlet 6 approved for dry service
Hastelloy C-276 ball valve (wet Cl₂)
Best corrosion resistance for wet chlorine service
PTFE-seated ball valve
PTFE seats are inert to all chlorine service conditions
Forged globe valve — extended bonnet
Slow-opening design prevents surge in toxic gas service
Valves to Avoid
Valves with copper alloy trim or seals
Titanium-bodied valves in hot service
Rubber-seated valves (chlorine attacks most elastomers)
Valves not rated for toxic/lethal service per ASME B31.3 Category M
Special Considerations
Applicable Standards
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