Menu
Search
Filters
Close
Menu

10188 Effect of Triethylene Glycol on Corrosion of Carbon Steel in H2S, CO2, and O2 Environments

Picture for 10188 Effect of Triethylene Glycol on Corrosion of Carbon Steel in H2S, CO2, and O2 Environments
Available for download

Periodic cleaning of sales gas lines often yields large quantities of material known as black powder. This paper describes a research study that was conducted to provide estimates for corrosion rates of carbon steel in TEG-water mixtures with TEG content in the range 0.0 wt% to 99.5 wt%.

Product Number: 51300-10188-SG
ISBN: 10188 2010 CP
Author: A.M. Sherik, A.L. Lewis, A.H. Rasheed, and A.A. Jabran
Publication Date: 2010
Industry: Gas/Liquid Pipelines
$0.00
$20.00
$20.00

Internal corrosion of dry sales gas pipelines is often overlooked due to the perceived absence of condensed water. However, periodic cleaning of sales gas lines often yields large quantities of material known as black powder, which can only be attributed to internal corrosion. Two potential sources of condensed water are: (1) treated natural gas whose water dew point exceeds the temperature of the pipeline, (2) water that co-condenses with triethylene glycol (TEG).

This paper describes a research study that was conducted to provide estimates for corrosion rates of carbon steel in TEG-water mixtures with TEG content in the range 0.0 wt% to 99.5 wt%. Fifteen-day tests in stagnant thin film of TEG-water mixtures were performed to study the effects of hydrogen sulfide, carbon dioxide, and oxygen gases on corrosion rates. The results showed that the corrosion rates in pure distilled water (0.0 wt% TEG) were low, ranging from 0.96 to 4 mpy. For all investigated gas compositions, these low initial corrosion rates rapidly dropped even lower with increasing TEG content in the TEG-water mixtures. At a TEG content of 90 wt% and greater, the corrosion rates become virtually 0.0 mpy regardless of the gas composition.

Keywords: black powder, triethylene glycol, corrosion, sales gas, TEG storage, water content

Internal corrosion of dry sales gas pipelines is often overlooked due to the perceived absence of condensed water. However, periodic cleaning of sales gas lines often yields large quantities of material known as black powder, which can only be attributed to internal corrosion. Two potential sources of condensed water are: (1) treated natural gas whose water dew point exceeds the temperature of the pipeline, (2) water that co-condenses with triethylene glycol (TEG).

This paper describes a research study that was conducted to provide estimates for corrosion rates of carbon steel in TEG-water mixtures with TEG content in the range 0.0 wt% to 99.5 wt%. Fifteen-day tests in stagnant thin film of TEG-water mixtures were performed to study the effects of hydrogen sulfide, carbon dioxide, and oxygen gases on corrosion rates. The results showed that the corrosion rates in pure distilled water (0.0 wt% TEG) were low, ranging from 0.96 to 4 mpy. For all investigated gas compositions, these low initial corrosion rates rapidly dropped even lower with increasing TEG content in the TEG-water mixtures. At a TEG content of 90 wt% and greater, the corrosion rates become virtually 0.0 mpy regardless of the gas composition.

Keywords: black powder, triethylene glycol, corrosion, sales gas, TEG storage, water content

Product tags
Also Purchased
Picture for 06442 POSSIBLE GLYCOL CORROSION IN NOMINALLY
Available for download

06442 POSSIBLE GLYCOL CORROSION IN NOMINALLY DRY GAS PIPELINES

Product Number: 51300-06442-SG
ISBN: 06442 2006 CP
Author: John S. Smart, III, Randy Roberts
Publication Date: 2006
$20.00

Pipeline quality gas is normally dried in Triethylene Glycol (TEG).  This paper explores how TEG vapor can exist in a pipeline in a similar manner to water, and possibly lead to corrosion. TEG vapor can condense at long distances down a gas pipeline as the line cools.
Picture for 98221 WHY DOES GLYCOL INHIBIT CO2
Available for download

98221 WHY DOES GLYCOL INHIBIT CO2 CORROSION?

Product Number: 51300-98221-SG
ISBN: 98221 1998 CP
Author: Egil Gulbrandsen, Jean-Herve Morard
$20.00
Picture for 00498 CORROSION OF CARBON STEELS IN MONOETHYLENE
Available for download

00498 CORROSION OF CARBON STEELS IN MONOETHYLENE GLYCOL

Product Number: 51300-00498-SG
ISBN: 00498 2000 CP
Author: J.J. Gonzfilez, M.E. Afonso, G. Pellegrino
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support