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Title: Analysis of Blind Flange and Thermowell Assembly from Wilsonville, Alabama, Solvent Refined Coal Plant dissolver tank

Abstract

A type 316 stainless steel blind flange and thermowell assembly rated at 17 MPa (2500 psi) was removed from service at the Wilsonville Solvent Refined Coal (SRC) plant when cracks were observed on the flange face. Metallographic examination revealed a system of cracks that penetrated a repair weld and extended into the base metal on the face where it was exposed to the process media. The cracking in the weld metal appeared to follow substructural boundaries. A second crack network initiated in the disturbed base metal beneath a ground surface and extended through a tenth of the flange thickness. Cracking in the base metal was transgranular. Neither the corroding species nor the local stress level responsible for the cracking can be specified.

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
6944196
Report Number(s):
ORNL/TM-6379
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 36 MATERIALS SCIENCE; SRC PROCESS; PILOT PLANTS; STAINLESS STEEL-316; CORROSION; COAL LIQUEFACTION; CRACKS; METALLOGRAPHY; WELDING; ALLOYS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; FABRICATION; FUNCTIONAL MODELS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; JOINING; LIQUEFACTION; MATERIALS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; STAINLESS STEELS; STEELS; THERMOCHEMICAL PROCESSES; 010405* - Coal, Lignite, & Peat- Hydrogenation & Liquefaction; 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

DeVan, J. H., Leslie, B. C., and King, R. T. Analysis of Blind Flange and Thermowell Assembly from Wilsonville, Alabama, Solvent Refined Coal Plant dissolver tank. United States: N. p., 1978. Web. doi:10.2172/6944196.
DeVan, J. H., Leslie, B. C., & King, R. T. Analysis of Blind Flange and Thermowell Assembly from Wilsonville, Alabama, Solvent Refined Coal Plant dissolver tank. United States. https://doi.org/10.2172/6944196
DeVan, J. H., Leslie, B. C., and King, R. T. Sat . "Analysis of Blind Flange and Thermowell Assembly from Wilsonville, Alabama, Solvent Refined Coal Plant dissolver tank". United States. https://doi.org/10.2172/6944196. https://www.osti.gov/servlets/purl/6944196.
@article{osti_6944196,
title = {Analysis of Blind Flange and Thermowell Assembly from Wilsonville, Alabama, Solvent Refined Coal Plant dissolver tank},
author = {DeVan, J. H. and Leslie, B. C. and King, R. T.},
abstractNote = {A type 316 stainless steel blind flange and thermowell assembly rated at 17 MPa (2500 psi) was removed from service at the Wilsonville Solvent Refined Coal (SRC) plant when cracks were observed on the flange face. Metallographic examination revealed a system of cracks that penetrated a repair weld and extended into the base metal on the face where it was exposed to the process media. The cracking in the weld metal appeared to follow substructural boundaries. A second crack network initiated in the disturbed base metal beneath a ground surface and extended through a tenth of the flange thickness. Cracking in the base metal was transgranular. Neither the corroding species nor the local stress level responsible for the cracking can be specified.},
doi = {10.2172/6944196},
url = {https://www.osti.gov/biblio/6944196}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {7}
}