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Also, there are no universal acceptance criteria on the maximum allowable size of an indication. They can be effectively used in the examination of nonporous, metallic materials, both ferrous and nonferrous, and of nonmetallic materials such as glazed or fully densified ceramics, certain nonporous plastics, and glass.
Agreement by the user and the supplier regarding specific techniques is strongly recommended. It is a common misconception to label a discontinuity as a crack. One of the most critical aspects of liquid penetrant testing is interpreting and evaluating the discontinuities. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Penetrating oils typically contain a red dye and are sprayed or brushed onto the area of the material being tested.
The purpose of this article is to describe these basic NDE techniques and discuss some of the advantages and disadvantages of the different methods. Some of the most popular NDE methods include: A scratch or a pore can easily be misinterpreted as a crack or flaw, and this can lead to unnecessary aatm costly repairs.
With this technique, liquid penetrant is applied to the surface of a material and is drawn into surface discontinuities such as cracks, pits and seams by capillary action. These inspections can increase the reliability of the part by providing early detection of flaws that could lead to a failure.
The reason is that some potable water sources contain chlorine, which can leave a residue on the surface and can lead to cracking in some stainless steels. Advertisement 4 Go to Page 1 2 3 4 Edit Story. The developer brings the penetrating oil out of the discontinuities by a blotting action. In most cases, the discontinuities are visible to the naked eye without liquid penetrant testing.
Active view current version of standard. To avoid this, any indications should be investigated by polishing and re-evaluating the indication.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The liquid penetrant examination just makes the discontinuities easier to see.
A suitable waiting time allows the penetrant to enter the surface discontinuities, and then excess penetrant can be removed.
Energy-Tech Magazine Contact us. An example of a gear tooth crack that atsm made more visible using a dye penetrant examination is shown in Figure 1. Box Dubuque, IA Phone: Pre-clean the surfaces to be inspected. Work Item s – proposed revisions of this standard. This is typically done with a special cleaning solvent.
Non-destructive examination NDE is used to detect cracks and other flaws in e1665-02 part without rendering the part unusable by performing destructive testing. It should be pointed out, however, that after indications have been produced, they must be interpreted or classified and then evaluated.
Then the surface must be allowed to dry. Link to Active This link will always route to the current Active version of the standard. A common recommendation is to use solvent and not potable water when cleaning stainless steel parts, such as turbine rotors, that will be highly stressed when in service.
For this purpose there must be a separate code or specification or a specific agreement to define the type, size, location, and direction of indications considered acceptable, and those considered unacceptable. SI units are e165-2 for information only.
The part then needs to be cleaned to remove the penetrant and the developer. This can take minutes after the developer is applied. Non-destructive examination basics Patrick J. They are nondestructive testing methods for detecting discontinuities that are open to the surface such as cracks, seams, laps, cold shuts, laminations, through leaks, or lack of fusion and are applicable to in-process, final, and maintenance examination.
ASTM E 02 – Español – PDF Free Download
The visible dye penetrant technique involves the following steps: As soon as the material is dry, the developer is applied. Care must be taken not to overly clean and remove the penetrant from the discontinuities. The penetrant that is trapped in aastm discontinuities will glow when viewed under a black light. Cracks typically show up as red lines and pits usually look like red dots.
ASTM E165(02) Espaol.pdf
The surface then needs to be solvent cleaned to remove any greases or oils. This technique can be used on a variety of ferrous and non-ferrous materials, including steel, stainless steel, aluminum, bronze, tungsten carbide, ceramics and plastics. This might involve sandblasting, wire brushing, etc.