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What is the typical maximum current level used in magnetic particle inspection under normal conditions, as measured in Amperes per inch (A/inch)?
What is the typical maximum current level used in magnetic particle inspection under normal conditions, as measured in Amperes per inch (A/inch)?
For inspecting precipitation hardening steels for inclusions, what current level might be considered at the upper end of the range in Amperes per inch (A/inch)?
For inspecting precipitation hardening steels for inclusions, what current level might be considered at the upper end of the range in Amperes per inch (A/inch)?
The central conductor technique is specifically designed for examining which type of component geometry?
The central conductor technique is specifically designed for examining which type of component geometry?
When examining a large diameter cylinder using the central conductor technique, where should the conductor ideally be positioned?
When examining a large diameter cylinder using the central conductor technique, where should the conductor ideally be positioned?
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If the central conductor is not positioned centrally within a cylindrical part during inspection, what procedural adjustment is required?
If the central conductor is not positioned centrally within a cylindrical part during inspection, what procedural adjustment is required?
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How is the required field strength determined for the central conductor technique?
How is the required field strength determined for the central conductor technique?
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What is the effect of passing the central conductor cable multiple times through a hollow part on the magnetic field strength?
What is the effect of passing the central conductor cable multiple times through a hollow part on the magnetic field strength?
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According to MIL-STD-1949A, when a central conductor is positioned near the central axis of a part, which current level guidelines are applicable?
According to MIL-STD-1949A, when a central conductor is positioned near the central axis of a part, which current level guidelines are applicable?
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For inspecting large surfaces using magnetic particle testing, what is considered a good practice for prod or yoke placement?
For inspecting large surfaces using magnetic particle testing, what is considered a good practice for prod or yoke placement?
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During magnetic particle examination, which method of magnetization is mandated for applying particles and removing excess dry particles?
During magnetic particle examination, which method of magnetization is mandated for applying particles and removing excess dry particles?
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Prior to magnetic particle examination, what is the MINIMUM width of the adjacent area around the examination surface that must be cleaned?
Prior to magnetic particle examination, what is the MINIMUM width of the adjacent area around the examination surface that must be cleaned?
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What specific information MUST be indicated on the sticker affixed to magnetizing units equipped with meters?
What specific information MUST be indicated on the sticker affixed to magnetizing units equipped with meters?
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According to the guidelines, performance and accuracy tests for magnetizing units should be conducted in accordance with which criteria?
According to the guidelines, performance and accuracy tests for magnetizing units should be conducted in accordance with which criteria?
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In magnetic particle testing, under what specific condition is the use of lead, steel, or aluminum prods preferred over copper prods?
In magnetic particle testing, under what specific condition is the use of lead, steel, or aluminum prods preferred over copper prods?
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For magnetic particle examination using white light, what is the MINIMUM intensity of visible light required at the surface of the part being inspected?
For magnetic particle examination using white light, what is the MINIMUM intensity of visible light required at the surface of the part being inspected?
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In field inspections using non-fluorescent magnetic particles, under what condition can the visible light intensity be reduced to 50 foot-candles?
In field inspections using non-fluorescent magnetic particles, under what condition can the visible light intensity be reduced to 50 foot-candles?
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In the context of magnetic particle examination, what is the primary purpose of determining the magnetizing current by dividing ampere-turns by the number of coil turns?
In the context of magnetic particle examination, what is the primary purpose of determining the magnetizing current by dividing ampere-turns by the number of coil turns?
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For circular magnetization using the direct contact technique, the magnetic field is oriented in which direction relative to the current flow?
For circular magnetization using the direct contact technique, the magnetic field is oriented in which direction relative to the current flow?
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What range of magnetizing current per inch of outside diameter is specified for circular magnetization using direct contact technique?
What range of magnetizing current per inch of outside diameter is specified for circular magnetization using direct contact technique?
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When examining a non-round part using circular magnetization, what dimensional characteristic is used to determine the inches for current application, as per the guidelines?
When examining a non-round part using circular magnetization, what dimensional characteristic is used to determine the inches for current application, as per the guidelines?
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In situations where the required current levels for coil magnetization (step 12.4.2) cannot be achieved, what is the primary method for demonstrating adequate magnetic field strength?
In situations where the required current levels for coil magnetization (step 12.4.2) cannot be achieved, what is the primary method for demonstrating adequate magnetic field strength?
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According to MIL-STD-1949A as referenced in this document, how should the 'diameter of the part' be determined for magnetizing current calculations?
According to MIL-STD-1949A as referenced in this document, how should the 'diameter of the part' be determined for magnetizing current calculations?
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Which types of magnetizing current are explicitly permitted for use in the direct contact technique of circular magnetization?
Which types of magnetizing current are explicitly permitted for use in the direct contact technique of circular magnetization?
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For large non-cylindrical parts examined by clamping contacts to the wall thickness, when is the use of a magnetic field indicator specifically required to demonstrate field adequacy?
For large non-cylindrical parts examined by clamping contacts to the wall thickness, when is the use of a magnetic field indicator specifically required to demonstrate field adequacy?
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When employing the offset central conductor technique, how is the effective diameter calculated for determining current levels?
When employing the offset central conductor technique, how is the effective diameter calculated for determining current levels?
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For an offset central conductor setup, what length along the part circumference is considered effectively magnetized for inspection purposes?
For an offset central conductor setup, what length along the part circumference is considered effectively magnetized for inspection purposes?
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During inspection using an offset central conductor, what percentage of magnetic field overlap is recommended when rotating the part?
During inspection using an offset central conductor, what percentage of magnetic field overlap is recommended when rotating the part?
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For what type of discontinuities is the yoke technique specifically applicable?
For what type of discontinuities is the yoke technique specifically applicable?
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Which type of electromagnetic yoke is generally considered superior for detecting surface discontinuities in materials thicker than 1/4 inch?
Which type of electromagnetic yoke is generally considered superior for detecting surface discontinuities in materials thicker than 1/4 inch?
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Besides electromagnetic yokes, what other type of yoke is permissible for use in the yoke technique?
Besides electromagnetic yokes, what other type of yoke is permissible for use in the yoke technique?
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In the multi-directional technique, how is magnetization primarily achieved?
In the multi-directional technique, how is magnetization primarily achieved?
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What is the intended outcome of rapidly alternating magnetizing circuits in the multi-directional technique?
What is the intended outcome of rapidly alternating magnetizing circuits in the multi-directional technique?
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What is the maximum allowable length for a linear indication identified as a crater crack to be considered acceptable?
What is the maximum allowable length for a linear indication identified as a crater crack to be considered acceptable?
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For linear indications evaluated 'as if', what is the maximum total length permitted within a continuous 12-inch weld length before being deemed unacceptable?
For linear indications evaluated 'as if', what is the maximum total length permitted within a continuous 12-inch weld length before being deemed unacceptable?
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According to the standards, what is the maximum permissible size for an individual pore to be considered acceptable?
According to the standards, what is the maximum permissible size for an individual pore to be considered acceptable?
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What is the maximum percentage of the thinner nominal wall thickness that an individual pore can measure to be considered acceptable?
What is the maximum percentage of the thinner nominal wall thickness that an individual pore can measure to be considered acceptable?
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For clustered pores found in the finish pass, what is the maximum diameter a cluster can have before it is deemed unacceptable?
For clustered pores found in the finish pass, what is the maximum diameter a cluster can have before it is deemed unacceptable?
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In a continuous 12-inch weld length, what is the maximum aggregate length of clustered pores permitted in the finish pass before it becomes unacceptable?
In a continuous 12-inch weld length, what is the maximum aggregate length of clustered pores permitted in the finish pass before it becomes unacceptable?
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For clustered pores in the finish pass, what is the maximum allowable size for an individual pore within the cluster?
For clustered pores in the finish pass, what is the maximum allowable size for an individual pore within the cluster?
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Who is responsible for determining the disposition (repair or removal) of pipe or fitting discontinuities, such as laminations or arc burns, detected by magnetic particle testing?
Who is responsible for determining the disposition (repair or removal) of pipe or fitting discontinuities, such as laminations or arc burns, detected by magnetic particle testing?
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During pre-inspection, which factor related to the environment is explicitly mentioned as needing consideration?
During pre-inspection, which factor related to the environment is explicitly mentioned as needing consideration?
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If a technician determines that initial test parameters cannot be adequately met prior to examination, what is the immediate required action according to the procedure?
If a technician determines that initial test parameters cannot be adequately met prior to examination, what is the immediate required action according to the procedure?
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Prior to conducting a magnetic particle examination, what specific assessment regarding magnetism of the component is required?
Prior to conducting a magnetic particle examination, what specific assessment regarding magnetism of the component is required?
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When preparing a surface for magnetic particle examination, the area adjacent to the examination surface must also be prepared. What is the minimum extent of this adjacent area?
When preparing a surface for magnetic particle examination, the area adjacent to the examination surface must also be prepared. What is the minimum extent of this adjacent area?
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Which of the following conditions is explicitly required for the surface intended for magnetic particle examination to ensure accurate interpretation of indications?
Which of the following conditions is explicitly required for the surface intended for magnetic particle examination to ensure accurate interpretation of indications?
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Under what specific condition is it acceptable to perform magnetic particle examination through coatings present on the component surface?
Under what specific condition is it acceptable to perform magnetic particle examination through coatings present on the component surface?
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Which of the following cleaning methods is explicitly listed as acceptable for surface preparation prior to magnetic particle examination?
Which of the following cleaning methods is explicitly listed as acceptable for surface preparation prior to magnetic particle examination?
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What procedural requirement is stipulated if surface finishing operations are performed on a component subsequent to magnetic particle examination?
What procedural requirement is stipulated if surface finishing operations are performed on a component subsequent to magnetic particle examination?
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Study Notes
Technical Procedure DTS-014-MP
- Document Date: December 10, 2019
- Revision: 2
- Pages: 21
- Prepared By: LL
- Revision By: DRW
- Approved By: JE
Magnetic Particle Examination
- Purpose: Establish minimum requirements for magnetic particle inspection of carbon steel aboveground storage tank components to detect surface or subsurface discontinuities.
- Scope: Applies to Detect Tank Services, LLC personnel. Code-specific procedures, interpretations, and acceptance standards are referenced in associated codes. Updated codes take precedence over this procedure if there is a conflict.
- References: ASME Boiler and Pressure Vessel Code Sections I, V, VIII, IX, and SE-1316 (2004 Edition); ASME B31.1-2004 Edition, B31.3-2004 Edition, B31.4-2004 Edition, B31.8-2004 Edition; AWWAD 100-96; AWS D1.1-2006; MIL-STD 271F; MIL-STD 1949A.
- Definitions: Definitions used in this procedure are according to ASME SE-1316, Standard Terminology for Nondestructive Examinations.
- Personnel Requirements: Personnel performing/evaluating magnetic particle examinations must be qualified/certified to at least Level II in MT per SNT-TC-1A.
- Equipment: Includes Parker DA 400 articulating yoke or equivalent, Spectroline black light or equivalent, and Detek D-250 pie gauge or equivalent.
- Procedure: Sensitivity of magnetic particle examination decreases with depth of subsurface discontinuities; good surface preparation is key. Each area requires two examinations, with flux lines at 90-degree angles to each other, and overlapping to ensure full coverage of the required sensitivity.
- Light Intensity: Visible light at the surface of examined parts must be a minimum of 100 foot-candles; ambient light in darkened examination areas should not exceed two foot-candles. 50 foot-candles may be used for non-fluorescent particles if agreed upon by the customer.
- Black Light: The black light must warm up for a minimum of five minutes before use and must offer minimum 1000 uW/cm2 intensity on the test surface.
- Dark Area Eye Adaptation: Examiners must adapt to dark viewing conditions for at least five minutes before the examination.
- Magnetic Particle Materials: Dry or wet particles should contrast clearly with the surface being examined. For wet particles, temperature should not exceed 135°F. Dry particle requirements meet AMS 3040. Surface temperature should not exceed 600°F when using dry particles.
- Calibration of Equipment: Ammeters associated with magnetizing equipment must be calibrated annually or as needed following any significant repairs, overhauls, or damage. Accuracy tolerance must not exceed ±10% of the full scale relative to the current value.
- Lifting Power of Yokes: Electromagnetic yokes must exhibit minimum lifting power of 10 lbs (using a two-inch to four-inch pole spacing), Direct current/permanent yokes should exhibit a minimumlifting power of 40 lbs (using a two-in to four-inch pole spacing) or 50 pounds (using a four-inch to six-inch pole spacing).
- Pre-Inspection: The test item's surface conditions, accessibility, plugging, masking and weather need to be considered.
- Surface Preparation: Clean the surface to be examined, removing any dirt, grease, oil, dust, etc. prior to testing, and check for residual magnetism using a field indicator or gauss meter. Cleaning methods include detergents, organic solvents, and ultrasonic cleaning if required.
- Prod Technique: Test welds using the prod or yoke method with a maximum interval of 8 inches. Shorter spacing (a minimum of 3 inches) may be used to increase sensitivity or accommodate specific part geometries
- Magnetizing Current: The current needed is determined by dividing the ampere-turns by the number of turns in the coil (I = NI/N) based on the part specifications
- Circular Magnetization: Use a direct current or rectified current for parts with circular shape or complex geometries, a magnetizing current between 300 to 800 amp/inch of part's outer diameter, with geometric measurements for non-round shapes.
- Central Conductor Technique: Used for cylinders or ring shapes, adjusting the conductor positioning to ensure comprehensive coverage of the circumference.
- Yoke Technique: This technique is used to inspect surface open discontinuities
- Multi-Directional Technique: Magnetizing multiple directions simultaneously to increase sensitivity, using high-amperage power packs.
- Evaluation: All indications are evaluated according to applicable codes or customer specifications, classified as acceptable or unacceptable, and documented. Surface conditions may be checked and documented.
- Retention: Examination records are retained for a minimum of three years per the codes, identified or tagged when required.
- Re-Examination: Repaired areas require re-examination using the identical procedure
- Appendixes: Various appendices provide additional information specific to certain codes such as ASME, API and AWS.
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Description
This quiz covers the essential procedures and standards outlined in the DTS-014-MP document for magnetic particle inspection of carbon steel storage tank components. It emphasizes the minimum requirements, relevant ASME codes, and definitions necessary for effective inspections. Knowledge of industry standards is crucial for maintaining safety and integrity in these inspections.
