Valves for Natural Gas Service
Natural gas (primarily methane) is transported in high-pressure pipelines and distributed at lower pressures. Pipeline service requires API 6D trunnion ball valves. City gas distribution (CGD) networks in India are regulated by PNGRB. Sour gas (H₂S-containing) requires NACE MR0175 materials.
Pressure Range
0.1 bar (distribution) to 150 bar (HP transmission)
Temperature
Ambient to 80°C
Industries
CGD city gas distribution, Gas transmission pipelines, CNG / PNG networks
Key Properties — Natural Gas
- Primary component: methane (CH₄) — 87–97%
- Odourless in pure form — mercaptans added for detection
- Flammability range: 5–15% in air
- MAOP (Maximum Allowable Operating Pressure) for city gas typically 0.1–19 bar
- Sour gas (H₂S) requires NACE MR0175 materials
Material Compatibility — Natural Gas
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 (API 5L, WCB) | Excellent | Standard pipeline material for sweet natural gas. |
| SS 316L | Excellent | Instrument and small bore service. |
| Duplex 2205 | Excellent | Sour gas service — superior H₂S resistance. |
| PTFE seats | Excellent | Standard for natural gas ball valve seats. |
| NBR | Good | Acceptable for low-pressure gas seals. HNBR for higher pressure. |
Recommended Valves
API 6D trunnion ball valve
High-pressure natural gas transmission pipelines — PNGRB standard
ASME Class 300/600 gate valve
Block and bleed at compressor stations and offtakes
ESD (Emergency Shut-Down) valve with actuator
Mandatory on city gate stations and compressor stations
Slam-shut valve
Automatic overpressure cut-off in gas distribution networks
Valves to Avoid
Non-fire-safe valves in any natural gas service
Copper-alloy valves for high-H₂S sour gas
Globe valves for mainline pipeline isolation
Special Considerations
Applicable Standards
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