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Preliminary checks for hydraulic and pneumatic recertification
(for safe potential reuse) are necessary. Before the safe working pressure
can be established, the material allowable working stress must be established.
Before the safe working pressure can be established, the material allowable
working stress must be established. To find the allowable stress the material
must identified.
- Where the cast (or "heat number") is clearly visible
the material may be traced to source by a search.
- Where the legibility of cast number stamping is in
doubt, establishing the material type and grade may be accomplished
by x-ray florescence spectography (a.k.a.: "PMI" Positive Material Identification).
[
X-Ray Spectography of Metals "PMI" ]
- If there is doubt from “A” or “B” above wet chemistry
may be used.
- Materials "sorting" between, may be accomplished
by eddy current. [
Identifying Metal With Eddy Current ]
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