KAN-TN-LP 03 - KAN Requirement for Mechanical and Physical Testing Laboratory

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KAN TECHNICAL NOTES FOR

MECHANICAL AND PHYSICAL

TESTING LABORATORY

Issue Number : 3 April 2016

Komite Akreditasi Nasional

National Accreditation Body of Indonesia Gedung BPPT 1, Lt. 14

Jl. M.H. Thamrin No. 8, Jakarta Pusat 10340 – Indonesia

Tel. : 62 21 3927422 ext. 173, 194, 195, 197, 210, 211 Fax. : 62 21 3927528

Email : laboratorium@bsn.go.id Website : http://www.kan.or.id

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APPROVAL SHEET

Reviewed by :

Quality Manager

Approved by :

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LIST OF AMENDMENT

No. Date Part number

revised Brief description of changes

Part revision number

1. January 2008 All Change of identification 2

2. April 2016 All Change of identification and change of address

3

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SPECIFIC REQUIREMENT FOR MECHANICAL AND PHYSICAL TESTING

1. INTRODUCTION

a. This Specific requirements are an interpretation of the general requirements of ISO/IEC 17025-2005.

b. This accreditation requirements are applicable to field of testing mechanical & physical, testing technical, type of test, and or specific test in mechanical & physical area, as extra information to the already generally stated requirements in each of the clauses ISO/IEC 17025-2005.

c. Mechanical testing is methods by which the mechanical properties of a metal are determined. The properties are including material that reveal its elastic and inelastic behavior when force is applied or that involve the relationship between the intensity of the applied stress and the strain produced.

d. Mechanical & physical testing is taken to include testing of modulus of elasticity, tensile strength testing, elongation, impact test, weld ability, bend test, compression, flattening, hardness testing, fatigue limit, nick break, drop weight, proof load, fasteners, hydraulic / pneumatic, component testing, etc.

2. PERSONNEL

a. The Laboratory operator has been working in relevant test areas of a Mechanical & physical laboratory for at least two years.

b. This person shall demonstrate competency by performance evaluation and by oral and/or written examination, the ability to perform correctly the required duties.

c. This person shall demonstrate competency by performance evaluation and by oral and/or written examination, the ability to perform correctly the required duties.

d. The laboratory shall be directed by persons having executive responsibility & competence to assume responsibility for the services of Mechanical & physical testing.

e. Laboratory management shall ensure that:

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2. Laboratory personnel have the knowledge, skills, and abilities based on education, experience, demonstrated skills, and training. To perform their duties.

3. Full educational and professional records of all technical staffs available to confirm their competence in Mechanical & physical testing.

f. Laboratory shall establish and define an internal training program and ensure the competency of laboratory personnel.

g. Laboratory shall have training procedure that used to ensure that training has taken place with each employee for procedures and methods that the employee performs. The procedure applies to on-the-job training, in-house training and new-hire training.

h. The laboratory shall maintain an up-to-date record of the training that each member of staff has received.

3. ACCOMMODATION AND ENVIRONMENTAL CONDITIONS

a. The laboratories are designed to provide space, engineering controls, and proper environmental conditions for optimal sample storage, sample handling, and analysis, in accordance with general laboratory practices, and environment suitable for the tasks carried out Mechanical & physical testing.

b. Laboratory shall have distinct space, in line with the safety requirements, for performing Mechanical & physical testing.

4. TEST METHOD AND METHOD VALIDATION

a. When choosing a Rockwell hardness machine, consider factors such as: 1. The accuracy and measurement repeatability that is required;

2. Whether versatility in the testing cycle may be required;

3. The required speed of testing;

4. The Rockwell scales that will be used;

5. The required resolution of the hardness number;

6. The size of material normally tested; and

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Dokumen ini tidak dikendalikan jika diunduh/ Uncontrolled when downloaded b. When using devices that employ measurement methods other than the Rockwell

indentation hardness principle, the type of measurement device that was used should be reported with the correlated Rockwell numbers.

c. The anvils and the anvil seat should be routinely cleaned and inspected for damage and replaced or reground when damage occurs.

d. A dirty anvil seat and almost any perceptible flaw on the anvil and anvil seat, such as scratches or indents, can significantly affect the hardness result.

e. When testing large samples of test material or material with a long shape that

significantly overhangs the hardness machine’s anvil support, the material should be

additionally supported using suitable outboard fixtures.

f. Otherwise, the overhang may cause a cantilever or lateral force to be applied to the indenter, resulting in measurement error or damage to the indenter.

g. These types of parts should not be supported by hand.

1. It is very important that the method used to attach an anvil to a Rockwell machine prevents any rocking or other movement of the anvil during the test. Many Rockwell machine designs attach the anvil by inserting its base into a slip fitting. This design is suitable for most purposes, although for critical applications, it may be beneficial to rigidly affix the anvil to the testing machine.

2. To selecting a Rockwell scale, the operator should select the scale that specifies

the largest load and smallest indenter possible to do the job without exceeding defined operating conditions and accounting for conditions that influence the test result. These influencing conditions include test specimens which are below the minimum thickness for the depth of indentation.

3. A test impression that falls too close to the edge of a specimen or another impression, indentations should be spaced greater than 3x indentation diameter and greater than 2-1/2x diameter from the edge of the specimen.

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Dokumen ini tidak dikendalikan jika diunduh/ Uncontrolled when downloaded 5. Cold 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;

5. EQUIPMENT AND MEASUREMENT TRACEABILITY

a. Laboratory shall have:

i. Equipment records containing description of the instrument, critical accessories and software, manufacturer's 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;

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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;

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calibration.

6. ASSURING THE QUALITY OF TEST RESULTS

a. Laboratory Quality Control is an essential aspect of ensuring that data released is fit for the purpose determined by the quality objectives.

b. Approach of quality control is the principal recourse available for ensuring that only quality data is released.

c. The Principe of the laboratory quality control program is its internal quality control to monitoring of analytical performance, and its external quality control based on the

laboratory’s performance in proficiency testing programs.

d. Laboratory Management is responsible for establishing a Laboratory Quality Control Program and ensures that quality control is performed and reviewed of quality control data for acceptability.

e. Operators are responsible for conducting quality control analyses in accordance with The Laboratory Quality Control Program.

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