Failure analysis of “O-rings” of reactor effluent air cooler

Venkataswamy, MA and Bhaskaran, TA and Keshab, Barai and Sujata, M and Bhaumik, SK (2003) Failure analysis of “O-rings” of reactor effluent air cooler. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Metallic O-rings from indigenous imported sources were sent to the laboratory for a comparative study. Analysis revealed that both the imported and indigenous O-rings are made of 5Cr-0.5Mo steel. However, there were wide variations in microstructures and hardness values in the O-rings from the two sources. While the imported O-rings were normalized and tempered to about 138HV, the indigenous ones were annealed and tempered to about 213 HV. It appears most probable that because of higher hardness, the indigenous O-rings did not deform uniformly during tightening resulting in non-uniform flow of material over the contact surfaces. This has resulted in ineffective sealing leading to leakage.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Metallic O-rings;5Cr-0.5Mo steel;heat treatment
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 08 Jul 2011 16:21
Last Modified: 08 Jul 2011 16:21
URI: http://nal-ir.nal.res.in/id/eprint/9287

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