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A scratch or a pore can easily be misinterpreted as a crack or flaw, and this can lead to unnecessary and costly repairs.
astm e 02 – PDF documents
Active view current version of standard. 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. Care must be taken not to overly clean and remove the penetrant from the discontinuities.
The penetrant that is trapped in any discontinuities will glow when viewed under a black light. In most cases, the discontinuities are visible to the naked eye without liquid penetrant testing. These inspections can aatm the reliability of the part by providing early detection of flaws that could lead to a failure.
Also, there are no universal acceptance criteria on the maximum allowable size of an indication. This can take minutes after the developer is applied. It is a common misconception to label a discontinuity as a crack. 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.
They are nondestructive testing methods 1e65-02 detecting discontinuities astk 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. Liquid penetrant testing Liquid penetrant inspection is the aastm popular method to check for surface cracks because it is simple and no special equipment is required.
The purpose of this article is to describe these basic NDE techniques and discuss some of the advantages and disadvantages of the different methods. As soon as the material is dry, the developer is applied. The developer brings the penetrating oil out of the discontinuities by a blotting action. To avoid this, any indications should be investigated by polishing and re-evaluating the indication.
The visible dye penetrant technique involves the following steps:. One of the most critical aspects of liquid penetrant testing is interpreting and evaluating the discontinuities. 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.
It is the responsibility of the user of this standard to 1e65-02 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Agreement by the user and the supplier regarding specific techniques is strongly recommended. The visible dye penetrant technique involves the following steps: Pre-clean the surfaces to be inspected. Then the surface must be allowed to dry.
Some equipment manufacturers allow some surface indications, depending on their size and location on a particular part. 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.
An example of a ee165-02 tooth crack that was made more visible asm a dye penetrant examination is shown in Figure 1. 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.
For this purpose there must be a separate code or specification or a d165-02 agreement to define the type, size, location, and direction of indications considered acceptable, and those considered unacceptable.
ASTM E165(02) Espaol.pdf
Referenced Documents purchase e1165-02 The documents listed below are referenced within the subject standard but are not provided as part of the standard. A suitable waiting time allows the penetrant to enter the surface discontinuities, and then excess penetrant can be removed.
Cracks typically show up as red lines and pits usually look like red dots. The surface then needs to be solvent cleaned to remove any greases or oils.
ASTM E – 02 Standard Test Method for Liquid Penetrant Examination
Non-destructive examination basics Patrick J. Some of the most popular NDE methods include: Energy-Tech Magazine Contact us. The correct term for a discontinuity is an indication, which is not necessarily a crack or a flaw. Link to Active This link will always route to the current Active version of the standard. This method substitutes fluorescent penetrating oil for the visible dye penetrant.
This is typically done with a special cleaning solvent. The liquid penetrant examination just makes the discontinuities easier to see.