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Power station cooling system-Sieve from steam condenser cooling water system-Crevice corrosion - Corrosion defects


Figure 1: Power station cooling system-Sieve from steam condenser cooling water system-Crevice corrosion.

Defect name: Power station cooling system-Sieve from steam condenser cooling water system-Crevice corrosion
Record No.: 251
Type of defect (Internal/Surface): Internal, surface
Defect classification: Corrosion defects
Steel name: Stainless steel (AISI 316).
Steel composition in weight %: No data.
Note:  
System: Power station cooling system.
Part: Sieve from steam condenser cooling water system.
Phenomenon: Crevice corrosion.
Appearance: Local attack underneath seal.
Time to failure: 2 years.
Environment: Flowing seawater, maximum temperature 40° C.
Cause: Because of the presence of a crevice between the seal and the stainless steel the construction is locally extra sensitive to attack by chloride.
Remedy: Use of a plastic sieve, or seal crevice with compound.
Reference: Not shown in this demonstration version.