During testing and operation of a bell blow down valve, a sintered bronze silencer/diffuser blew apart. Due to extensive fragmentation of the diffuser it has been impossible to determine the reason for this incident, but it is thought to have been caused by a build up of debris within the unit, and possible impact damage during normal use.
The contractor has recommended the following routine should be included in the Planned Maintenance System for the silencer/diffuser.
- Strip down assembly
- Remove deposits using a soft wire brush
- Treat components in an active ultrasonic bath with a suitable solvent to remove rust, corrosion, scale and tarnish until visibly clean
- Dry component using diving quality air
- Reassemble, install and test the assembly.
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