What material should a gate valve for Amine (DEA / MEA / MDEA - Gas Sweetening) be?

SS 316L (Excellent): Standard material for rich amine, regenerator, and reboiler service. Duplex SS 2205 (Excellent): Excellent corrosion resistance in amine; sometimes used for critical valves. Hastelloy C-276 (Excellent): Used for hottest, most corrosive amine service points. Carbon Steel (Good): Acceptable for lean amine at low temperature with velocity limits <3 m/s. Not for rich amine regenerator. SS 304L (Good): Acceptable for lean amine; 316L preferred in hot rich amine. PTFE seats (Good): Acceptable for lean amine at low temperature; check chemical compatibility at regenerator conditions.

Amine (DEA / MEA / MDEA - Gas Sweetening) service

Service Selection

Gate Valves for Amine (DEA / MEA / MDEA - Gas Sweetening) Service

Which gate valves configuration suits Amine (DEA / MEA / MDEA - Gas Sweetening), in which material, to which standard — from real service data, with the pitfalls flagged.

Which gate valves for Amine (DEA / MEA / MDEA - Gas Sweetening)?

Gate Valve (SS 316L, OS&Y, NACE) - Large-bore isolation on amine contactors and regenerator columns. Typical service window: Absorber: 30–100 bar; Regenerator: 1–2 bar (vacuum flash), Absorber: 35–65°C; Regenerator reboiler: up to 135°C.

Recommended Configurations

Gate Valve (SS 316L, OS&Y, NACE)

Large-bore isolation on amine contactors and regenerator columns.

Body Material for Amine (DEA / MEA / MDEA - Gas Sweetening)

Rated from real compatibility data - click any material for the full decision page.

SS 316LStandard material for rich amine, regenerator, and reboiler service.Excellent Duplex SS 2205Excellent corrosion resistance in amine; sometimes used for critical valves.Excellent Hastelloy C-276Used for hottest, most corrosive amine service points.Excellent Carbon SteelAcceptable for lean amine at low temperature with velocity limits <3 m/s. Not for rich amine regenerator.Good SS 304LAcceptable for lean amine; 316L preferred in hot rich amine.Good PTFE seatsAcceptable for lean amine at low temperature; check chemical compatibility at regenerator conditions.Good

Governing Standards for Amine (DEA / MEA / MDEA - Gas Sweetening) Service

NACE MR0175 / ISO 15156 (sour service)ASME B16.34 API 600 (large bore gate/globe)ASME B31.3

What to Avoid in Amine (DEA / MEA / MDEA - Gas Sweetening) Service

Carbon steel valves in rich amine at high temperature (corrosion rates >1 mm/year)
Copper alloy valves (amine attacks copper)
Valves with hardened trim above NACE MR0175 limit (22 HRC maximum for wetted metal parts)

Service Considerations

NACE MR0175 compliance for all metallic components in H₂S co-service - mandatory in sour gas plant design
Amine foaming: caused by valve-induced turbulence - flow velocities must be controlled
Corrosion allowance: specify minimum 3 mm additional wall for carbon steel in lean amine service
Shutdown and standby: amine systems must be kept full or nitrogen-blanketed to prevent oxidation during downtime

Other valve types for Amine (DEA / MEA / MDEA - Gas Sweetening)

Ball Valves for Amine (DEA / MEA / MDEA - Gas Sweetening)Globe Valves for Amine (DEA / MEA / MDEA - Gas Sweetening)Control Valves for Amine (DEA / MEA / MDEA - Gas Sweetening)

Gate Valves for other services

Gate Valves for Hydrochloric Acid (HCl)Gate Valves for Chlorine (Cl₂)Gate Valves for Seawater Gate Valves for Crude Oil Gate Valves for Ammonia (NH₃)Gate Valves for LNG / Cryogenic Natural Gas Gate Valves for High-Pressure Steam Gate Valves for Carbon Dioxide (CO₂)

Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026

Connected Engineering

Standards

API 6D ASME B16.34 NACE MR0175

Materials

A351 CF8M (SS316)

Failure Modes

Stress Corrosion Cracking

Products

Gate Valves

Comparisons

Gate vs Ball Valve

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Relevant Products

Vajra Gate Valves

Engineering references

Amine (DEA / MEA / MDEA - Gas Sweetening) service guideFull compatibility, standards & considerations Vajra Gate ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ