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06442 POSSIBLE GLYCOL CORROSION IN NOMINALLY DRY GAS PIPELINES

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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.

Product Number: 51300-06442-SG
ISBN: 06442 2006 CP
Author: John S. Smart, III, Randy Roberts
Publication Date: 2006
Industries: Gas/Liquid Pipelines , Chemical Inhibitors
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Pipeline quality gas is normally dried in Triethylene Glycol to reduce its water dew point to below the lowest operating temperature in a pipeline, and the presence of glycol as a vapor into the gas has been regarded as insignificant. 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, with most condensing above 60oF. However, even the small quantities involved accumulate with volume and time, and can become significant. The corrosion rate of steel in glycol is lower than for water and the problem is a long term one. In-Line Inspection for gas pipelines should pick up internal corrosion as well as external corrosion. Lines that are “not piggable” should be rinsed with a water/methanol slug driven by a foam disc pig to reduce risk when high risk areas such as low spots under rivers are present.

Keywords: Glycol, Triethylene Glycol, glycol corrosion, dew point, gas pipeline internal corrosion

 

Pipeline quality gas is normally dried in Triethylene Glycol to reduce its water dew point to below the lowest operating temperature in a pipeline, and the presence of glycol as a vapor into the gas has been regarded as insignificant. 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, with most condensing above 60oF. However, even the small quantities involved accumulate with volume and time, and can become significant. The corrosion rate of steel in glycol is lower than for water and the problem is a long term one. In-Line Inspection for gas pipelines should pick up internal corrosion as well as external corrosion. Lines that are “not piggable” should be rinsed with a water/methanol slug driven by a foam disc pig to reduce risk when high risk areas such as low spots under rivers are present.

Keywords: Glycol, Triethylene Glycol, glycol corrosion, dew point, gas pipeline internal corrosion

 

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