7/31/2019 DP Qualif Procedure by Using Crack Test Block
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This procedure applies to the qualification of penetrant liquids
family MR 67PS + MR 70(water washable, color contrast &
fluorescent penetant liquids), in order to state acceptancefor use
under the procedure code X-008062, rev.12.The system performance
test is performed on the aluminium comparator test
blockmanufactured acc. to ASME Code, Section V, Art.6, III-610,
with a network of artificial finecracks on each face)::
A
B A
B
Part A of the block is used with an already qualified penetrant
liquids family (as for exampleMR 68NF + MR 70, water washable color
contrast penetrant liquids), Part B of the block isused with the
family of penetrant liquids to be qualified.Whether the block is a
new one or not, the comparator test block shall be thoroughly
cleanedby focusing solvent spray MR 85 or isopropyl alcohol on the
cracked areas of the block, thanrinseing with clean water and
spraying again the cracked areas with solvent, and finally drythe
block by natural evaporation at room temperature.The performance
test temperature is the same for both penetrant liquids, in the
standard
temperatures range. As a minimum, one test shall be performed at
the workshoptemperature.The operations stated in the applicable
procedure (Method A - Type I) are performed apart,using each
penetrant liquids family on the respective part of the test
block.Caution shall be exercised to prevent mixing of test
materials from different families:
If the block is a divided one, the two parts shall be placed far
enough apart in time of theperformance test to prevent
contamination;
If the two parts are separated by a rectangular notch, this one
shall be used to insert aseparation panel, tigtly inserted in the
notch to prevent mutual contamination of parts.
Excepting the materials, the essential variables of the process
shall be the same for bothpenetrant liquids families, within the
applicable procedure statements.
If the indications obtained on part B are essentially the same
as those obtained on part A,the penetrant liquids family MR 67PS +
MR 70 is qualified for use under the procedure codeX-008062,
rev.12.
