API 578 Flashcards
PMI test method (3)
X-ray emission spectrometry, optical emission spectrometry, or wet chemical analysis
PMI within the warehouse should not be regarded as
an alternative to PMI of the fabricated assets when PMI is specified.
the greatest number of material nonconformances with serious consequences have involved placing
unapproved carbon steel components into low-alloy steel
Typical PMI records should contain the following: (5)
— reference to the PMI procedure(s) used;
— date of testing;
— test instrument identification number or serial number, where appropriate;
— name of each person performing the tests, with identification of their respective employer;
— results of the tests;
longitudinal welds should receive what type of PMI, and location
random, weld and base metal
who is responsible to determine extent of alloy service before placed in service?
owner/user
Techniques such as eddy-current sorting, electromagnetic alloy sorting, triboelectric testing (e.g. ferrite meters), and thermoelectric testing
are qualitative and as such may only be appropriate for limited sorting applications and not for specific alloy identification.
API578 only applies to what material
metallic alloy, ferrous and non ferrous alloys
Mill test reports should not be considered
a substitute for PMI , (used for QA)
some types of components can have a higher likelihood of unapproved substitution of a nonspecified material. This can provide a basis for prioritizing specific equipment in a given system or process unit. Examples are:
— warm-up and bypass lines on pumps or check valves;
— small bore piping (2 NPS and below);
— valves, valve assemblies, and valve bonnets, and removable devices such as rupture disks, spacer blinds, blind flanges, plugs, or ring joint gaskets;
— thermowells;
— bolting;
— piping as a part of a packaged system;
— components without recognized marking;
— process systems with history of frequent maintenance requirements;
— welds;
— threaded components.
Identification of materials by visual stamps/markings alone should not be considered
as a substitute for PMI but may be an important component of an overall quality assurance program.
testing on autogenous weld
conduct testing on only the base metal.
Calibration and/or verification of the PMI test equipment should be performed:
As specified the equipment manufacturer, if not by owner
if any one of a representative sample is rejected,
all items of that inspection lot should be considered suspect. A more extensive inspection of the remaining lot should be considered
When PMI indicates that alloying elements are outside the ranges indicated in the material specification, the owner/user may still choose to allow the use of the tested materials in situations where a person
knowledgeable of the appropriate damage mechanisms confirms that the material will perform satisfactorily in the service.
