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The liquid penetrant testing in ASME standards refers to theASME Code Section V Article 6, and it addresses the different methods andtechnique and corresponding requirements.

Download Free PDF. Download Free PDF. Nondestructive Examination SECTION V 2019 ASME Boiler and Pressure Vessel Code An International Code. American Society of Mechanical Engineers (ASME) Code. ASME Section V, Article 7 requirements are addressed in this procedure is intended to meet the requirements of ASME Section VIII Division 1 'Pressure Vessels' Latest Edition. ASME B 16.34 requirements for Flanged, Threaded and Welding End valves are also addressed.

The requirements include to thecleaning methods, penetrant dwell time, developer dwell time, liquid penetrantmaterial specification, test object temperature requirements, techniciansqualification requirements, test procedure content requirements, test reportrequirements, etc.

The article 6 of ASME Code does not provide acceptancecriteria to evaluate test result. The construction code cover that section.

For example, if the test object is a component from powerboiler, then the acceptance criteria can be found in ASME Code Section I or ifthe test object is a part of the pressure vessel, then acceptance criteria canbe found in the ASME VIII Div 1 Appendix 8.

Liquid Penetrant Testing in ASME with Different Technique

The article 6 of ASME Code Section V introduces twotechniques with the total of 6 processes as followings:

1. Color contrast Liquid Penetrant Testing
2. Fluorescent Liquid Penetrant Testing

Each of above-mentioned technique can be applied with one ofthe following methods

1. Water Washable Method
2. Post-emulsifying Method
3. Solvent Removable Method

For instance, based on written procedure (test procedure)you may perform the test with color contrast technique and with the removablesolvent method. So totally you have six types of liquid penetrant testing.

Obviously, the fluorescent technique has more sensitivitythan color contrast technique. You may be able to detect a defect byfluorescent technique but not with color contrast technique.

In general, the written practice (the test procedure) shallbe approved by certified ASNT Level III specialist and be conducted by LevelII. The test result can beevaluated/interpreted based on the acceptance criteria either by Level II orLevel III.

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The liquid penetrant testing code refers to ASME CodeSection V article 6 for performing the test. This code section providesrequirements for liquid penetrant testing Personnel qualification, writtenprocedure requirements, liquid penetrant test techniques and process and itsrelated requirements, penetrant and developer dwell time requirement, liquidpenetrant testing equipment calibration requirements and etc. The code sectionguides how to perform the test and what requirements shall be followed.

Liquid Penetrant Testing Code for Acceptance Criteria

ASME Code section V article 6 does not provide theacceptance criteria. For acceptance criteria, you should refer to correspondingmanufacturing code.

For example, if you are going to perform a liquid penetranttest on power piping girth weld, the acceptance criteria can be found on theASME B31.1, or you want to perform a liquid penetrant test on process piping,then you need to refer to the ASME B31.3. Please note, an indication might be considered as a defect by aconstruction code, but the same indication not considered a defect by anothermanufacturing code.

The test always shall be performed based on approvedprocedure. The procedure is typically prepared and approved by an ASNT LevelIII and conducted by a level II technician.

Other Liquid Penetrant Testing Code

The other considered as standard and not code. The verbiageof code is used when mandated by a government or authority. For example in thestate of California, designing and manufacturing of pressure vessel shall bebased on ASME Code. Then automatically, requirements of the ASME Section Varticle 6 for liquid penetrant testing is a requirement by law (when is appliedto pressure vessel)

The other common standard is:

ASTM E 165, Standard Practice for Liquid PenetrantExamination for General Industry

ASTM A903, Standard Specification for Steel Castings,Surface Acceptance Standards, Magnetic Particle and Liquid Penetrant Inspection

ASTM E1208, Standard Practice for Fluorescent LiquidPenetrant Testing Using the Lipophilic Post-Emulsification Process

ASTM E1220, Standard Practice for Visible Penetrant TestingUsing Solvent-Removable Process

Asme Section V Article 6 Pdf Format

There are hundreds of other standard and specification inthe market for performing and evaluating the result of liquid penetranttesting. Each industry has own codes and standards.

Asme Section V Article 6 Pdf Printable

For instance, Society ofAutomotive Engineers International have SAE AMS 2644 (Inspection Material,Penetrant), SAE AMS 2647B (SAE AS 3071A), SAE AMS 3161A (Oil, Odorless HeavySolvent), SAE AS 3071A (Acceptance Criteria Fluorescent Penetrant) and SAE J426 (Liquid Penetrant Test Methods, Information Report)

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