Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

06588 CORROSION RATES OF CARBON STEEL In HF ALKYLATION SERVICE

Picture for 06588 CORROSION RATES OF CARBON STEEL IN HF
Available for download

Corrosion rates for carbon steel piping circuits in a petroleum refinery HF (hydrofluoric) Alkylation unit were examined. The HF acid process environment was one of three types: liquid HF acid, superheated HF acid vapor, or HF acid dissolved in a hydrocarbon phase.

Product Number: 51300-06588-SG
ISBN: 06588 2006 CP
Author: Clinton J. Schulz
Publication Date: 2006
Industry: Petroleum Refining
$0.00
$20.00
$20.00

Corrosion rates for selected carbon steel piping circuits in a petroleum refinery HF (hydrofluoric) Alkylation unit were examined. The HF acid process environment was characterized as being one of three types: liquid HF acid (including saturated and condensing HF vapor services), superheated HF acid vapor, or HF acid dissolved in a hydrocarbon phase. Corrosion data, both from refinery inspection data and from available literature 1-3, was plotted using an Arrhenius type plot in which the logarithm of the corrosion rate is plotted versus the reciprocal of the absolute temperature. Temperature functions for the corrosion rate were developed for the liquid HF acid service and superheated HF acid vapor. The corrosion rate of superheated acid is estimated to be about 20% of the rate of liquid acid at the same temperature. The observed corrosion rate for acid dissolved in hydrocarbon was intermediate between the rates for liquid acid and superheated acid vapor. Using this approach, it was possible to predict the observed circuit average corrosion rate. For the circuits examined, each had a significant range of corrosion rates, typically about 300%, that is, the largest observed individual rate was about 3 times or more that of the smallest observed rate. This range in observed corrosion rates is believed to result from the effect of steel composition, as reported by others4. The characterization of the process environment into either superheated HF vapor or liquid phase also allows for a quantitative evaluation of the effect of process conditions on the resulting corrosion rates.

KEY WORDS: HF Alkylation process, corrosion rates, HF acid, superheated HF acid vapor, HF acid dissolved in hydrocarbon

Corrosion rates for selected carbon steel piping circuits in a petroleum refinery HF (hydrofluoric) Alkylation unit were examined. The HF acid process environment was characterized as being one of three types: liquid HF acid (including saturated and condensing HF vapor services), superheated HF acid vapor, or HF acid dissolved in a hydrocarbon phase. Corrosion data, both from refinery inspection data and from available literature 1-3, was plotted using an Arrhenius type plot in which the logarithm of the corrosion rate is plotted versus the reciprocal of the absolute temperature. Temperature functions for the corrosion rate were developed for the liquid HF acid service and superheated HF acid vapor. The corrosion rate of superheated acid is estimated to be about 20% of the rate of liquid acid at the same temperature. The observed corrosion rate for acid dissolved in hydrocarbon was intermediate between the rates for liquid acid and superheated acid vapor. Using this approach, it was possible to predict the observed circuit average corrosion rate. For the circuits examined, each had a significant range of corrosion rates, typically about 300%, that is, the largest observed individual rate was about 3 times or more that of the smallest observed rate. This range in observed corrosion rates is believed to result from the effect of steel composition, as reported by others4. The characterization of the process environment into either superheated HF vapor or liquid phase also allows for a quantitative evaluation of the effect of process conditions on the resulting corrosion rates.

KEY WORDS: HF Alkylation process, corrosion rates, HF acid, superheated HF acid vapor, HF acid dissolved in hydrocarbon

PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 03651 Specification for Carbon Steel Materials
Available for download

03651 Specification for Carbon Steel Materials for Hydrofluoric Acid Alkylation Units

Product Number: 51300-03651-SG
ISBN: 03651 2003 CP
Author: Andy Gysbers, Hisham Hashim, Dannie Clarida, Gregmar Chirinos, Dr. John Marsh, Dr. Jim Palmer
Publication Date: 2003
$20.00

 Joint Industry Project “Materials Specification for HF Alkylation Plant” to develop test and corrosion rate measurement procedures for materials in HF environments and to develop a carbon steel materials specification w.r.t levels of residual elements and carbon in steels for HF alkylation equipment.
Picture for 07570 The Top Ten Corrosion Issues Affecting HF Alkylation Units
Available for download

07570 The Top Ten Corrosion Issues Affecting HF Alkylation Units

Product Number: 51300-07570-SG
ISBN: 07570 2007 CP
Author: Jonathan D. Dobis
Publication Date: 2007
$20.00

This paper summarizes the Top Ten corrosion issues and examines the controlling factors that affect damage including the effects of operating parameters. Best industry practices used to monitor for problems and to inspect for damage are discussed.
Picture for 04645 The Effect of Operating Conditions on
Available for download

04645 The Effect of Operating Conditions on Corrosion in HF Alkylation Units

Product Number: 51300-04645-SG
ISBN: 04645 2004 CP
Author: Jonathan D. Dobis, The Equity Engineering Group Inc.; Dana G. Williams and David L. Bryan Jr., Marat
$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