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Low pressure Double walled refrig tank inspection

Low pressure Double walled refrig tank inspection

Low pressure Double walled refrig tank inspection

(OP)
The previous fixed equipment / pressure vessel engineer in my plant OK'd a 30 year waiver on the internal inspection of our API620, low pressure, double walled refrigerated tank. This is not a small tank: 23m diam, 24m high.

Construction is essentially CS outer shell. 9Ni inner shell. It stores Ethylene at -101C [or in that ball park] and has a perlite insulation filler between inner and outer shells. We have CP on the base.

The guidance notes he left referred to the potential for damage on inducing a temperature cycle for inspection.

A degradation review suggests that external issues are the main degradation concerns during normal service.

The 30yrs are up in 2009.

Any industry experience available to suggest a need for inspection??

(In Victoria Australia, we've moved to a self regulated regulatory audit at any time environment...)

Thanks in advance.

Rob

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