KAN-TN-LP 03 Issue Number : 3
April 2016
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5. C old rolled sheet metal is that work hardening can create a gradient of hardness
through the sample so any test is measuring the average of the hardness over the depth of indentation effect.
h. Each time an anvil is installed, regardless of its design, it must be adequately
seated to the testing machine by making repeated hardness tests on a uniform piece of material, such as a test block. The test shall repeat until there is no increasing or
decreasing trend in the measured hardness values. i.
When testing curved parts, it is extremely important that the part is properly aligned such that the indentation is made at the apex of a convex surface or at the bottom of a
concave surface. j.
The test method are adequately documented are based on the latest valid edition of a published reference method, including:
i. Title and method number;
ii. scope and field of application; iii. Number of revision;
iv. page numbering, total number of pages; v. references;
vi. principles and definitions; vii. apparatus;
viii. expression of results; ix. performance criteria;
x. issuing authority.
5. EQUIPMENT AND MEASUREMENT TRACEABILITY
a. Laboratory shall have:
i. Equipment records containing description of the instrument, critical accessories
and software, manufacturers name, type identification and serial number; Laboratory number ; installation qualification IQ and operational qualification
OQ records obtained from the installer or manufacturer; and other related material such as instrument service and repair, warranty information, service
contract conditions and specifications; ii. Laboratory shall have operating instructions for each instrument, including
starting and shutting down the instrument;
KAN-TN-LP 03 Issue Number : 3
April 2016
Dokumen ini tidak dikendalikan jika diunduh Uncontrolled when downloaded
iii. Verification of sieve accuracy shall be performed at least annually on each sieve used in the test for sieve analysis.
b. Each method of sieve verification shall include a checking of sieve cloth for punctures
or obvious defects. c.
Verification of each sieve may use according to the procedures a comparison of the results of a split sample sieved on different sieve sets.
d. Results shall be verified for single operator precision to the within the acceptable
range of two results stated in the test method. e.
All testing equipment shall be appropriate for the particular tests and the capacity shall be suitable.
f. Where applicable, the testing equipment shall be capable to perform the required load
at continuous defined speeds until no greater load can be sustained. g.
Dies and cutters for preparation of test specimens shall be check frequently for full dimensional of damage.
h. When an instrument is discovered to be improperly operating, it is tagged and taken
out of service. i.
Equipment is not returned to service until performance checks and verification have been performed and documented.
j. Each instrument has an established schedule specifying performance checks,
including the testing frequency and acceptable performance specifications. k.
These performance checks ensure the instrument is operating properly and consistently prior to analysis.
l. Hardness Testing shall do a performance check on each day before each type of
hardness tests. i. The check shall be at forces similar to those involved in the tests to be conducted.
So far as is practicable the hardness values involved shall match those involved; ii. Laboratories shall have an adequate range of blocks to cover the range of
hardness and the forces normally encountered; iii. For Vickers and Rockwell hardness tests, indenters have been checked by
performance tests on hardness blocks with assigned values and by inspection at a magnification of at least 50x;
iv. Hardness blocks with assigned values from established block manufacturers such as Vickers, Avery, Wilson and Yamamoto shall be used for the yearly partial
KAN-TN-LP 03 Issue Number : 3
April 2016
Dokumen ini tidak dikendalikan jika diunduh Uncontrolled when downloaded
calibration.
6. ASSURING THE QUALITY OF TEST RESULTS
