What materials are compatible with MEG / Glycol (Monoethylene Glycol - Gas Dehydration)?

Carbon Steel (WCB/A105) (Good): Acceptable with corrosion inhibitor dosing. Monitor oxygen ingress - causes accelerated corrosion.. SS 316L (Excellent): Preferred for inhibited MEG and TEG service, especially at elevated temperature in regeneration.. Duplex SS (2205) (Excellent): Used in offshore MEG service where seawater contamination risk exists.. PTFE seats (Excellent): Suitable across full MEG service temperature range.. Hastelloy C-276 (Excellent): Used in rich MEG service at elevated temperature in regeneration columns.

Home Service by FluidMEG / Glycol (Monoethylene Glycol - Gas Dehydration)

utilityC₂H₆O₂CAS 107-21-1

Valves for MEG / Glycol (Monoethylene Glycol - Gas Dehydration) Service

Monoethylene glycol (MEG) is used as a hydrate inhibitor in natural gas pipelines and as a refrigerant in gas processing plants. Triethylene glycol (TEG) is used for gas dehydration (TEG contactors). Both are hygroscopic, viscous, and mildly corrosive. Indian gas transmission companies (GAIL, GSPC, Reliance) use MEG injection extensively in deepwater pipeline service.

Pressure Range

Up to 400 bar for deepwater injection; 10–50 bar for onshore pipeline injection

Temperature

−40°C (sub-sea pipeline) to +190°C (TEG regeneration)

Industries

Offshore gas pipelines (deepwater MEG injection), Onshore gas transmission (hydrate inhibition), LNG regasification terminals

INDICATIVE ONLY - Reference DisclaimerMEG and TEG are generally low-hazard fluids but high-pressure MEG injection service involves extreme pressures. All equipment must comply with the applicable pressure equipment regulations and the project's specific material selection report. Vajra Industrial Solutions accepts no liability for material selection decisions based on this guide.

What valves are used for MEG / Glycol (Monoethylene Glycol - Gas Dehydration) service?

Ball Valve (SS 316 body, PTFE seats) are recommended for MEG / Glycol (Monoethylene Glycol - Gas Dehydration) service: Standard isolation for MEG injection lines and recirculation..

Key Properties - MEG / Glycol (Monoethylene Glycol - Gas Dehydration)

Concentration: 60–80 wt% MEG/water mixture for hydrate inhibition
Viscosity: significantly higher than water, especially at low temperatures (−40°C to +20°C)
Hygroscopic - absorbs water aggressively from process streams
Mildly corrosive to carbon steel at elevated temperatures without inhibitor
Boiling point 197°C - no vapour pressure concern at normal operating conditions

Vajra Industrial Solutions manufactures and supplies valves for MEG / Glycol (Monoethylene Glycol - Gas Dehydration) service — including ball valve (ss 316 body, ptfe seats) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.

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Relevant Products

Ball Valves Globe Valves Check Valves Needle Valves

Material Compatibility - MEG / Glycol (Monoethylene Glycol - Gas Dehydration)

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/A105)	Good	Acceptable with corrosion inhibitor dosing. Monitor oxygen ingress - causes accelerated corrosion.
SS 316L	Excellent	Preferred for inhibited MEG and TEG service, especially at elevated temperature in regeneration.
Duplex SS (2205)	Excellent	Used in offshore MEG service where seawater contamination risk exists.
PTFE seats	Excellent	Suitable across full MEG service temperature range.
Hastelloy C-276	Excellent	Used in rich MEG service at elevated temperature in regeneration columns.

Recommended Valves

Ball Valve (SS 316 body, PTFE seats)

Standard isolation for MEG injection lines and recirculation.

Full selection guide

Globe Valve (SS 316, CV-characterised)

Flow control at MEG injection quill or dosing skid.

Full selection guide

Check Valve (SS 316, spring-loaded piston)

Pump discharge non-return on MEG injection pumps to prevent backflow.

Full selection guide

Needle Valve (SS 316 or 316L)

Flow metering and sample points on MEG injection systems.

Full selection guide

Valves to Avoid

Copper alloy valves (glycol attacks copper over time)

Carbon steel at elevated temperature without inhibitor dosing

Valve with low-flow dead zones that allow stagnant glycol to concentrate and corrode

Special Considerations

Deepwater MEG injection: extremely high pressure (>200 bar) requires Class 1500–2500 valves

TEG regeneration reboiler: temperatures up to 200°C require checking PTFE seat limits

Oxygen ingress to MEG causes accelerated corrosion - seal quality on valves is critical

MEG is biodegradable but regulatory limits apply for offshore discharge

Applicable Standards

ASME B16.34NACE MR0175 (sour gas co-service)API 6D (pipeline service)

Shop Valves for MEG / Glycol (Monoethylene Glycol - Gas Dehydration) Service

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Part of the Vajra Fluid Service Library

MEG / Glycol (Monoethylene Glycol - Gas Dehydration) Service — Procurement & Specification

Typical Applications

Offshore gas pipelines (deepwater MEG injection)Onshore gas transmission (hydrate inhibition)LNG regasification terminalsGas processing plants (TEG dehydration)Refrigeration systems (chilled water ethylene glycol)

Available Standards

ASME B16.34NACE MR0175 (sour gas co-service)API 6D (pipeline service)

Material Options

Carbon Steel (WCB/A105)SS 316LDuplex SS (2205)PTFE seatsHastelloy C-276

Documentation Available