SY/T 5448-1992 Nondestructive testing methods for oil well pipes Magnetic particle testing of drilling tool threads SY/T5448-1992 Standard download decompression password: www.bzxz.net

SY/T5448—92, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Non-destructive Testing Methods for Oil and Pipeline
Magnetic Particle Testing of Drill Tool Threads
1992-10-01 Implementation
Ministry of Energy of the People's Republic of China
Main Contents and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of ChinaNon-destructive Testing Methods for Oil and Pipeline
Magnetic Particle Testing of Drill Tool Threads
SY/T 5448—92
This standard specifies the general requirements, magnetization method, magnetic field strength, magnetic suspension preparation, flaw detection method, magnetic trace evaluation and flaw detection report writing method for magnetic particle testing of drill tool threads.
This standard is applicable to magnetic particle testing of surface or near-surface defects in the threaded parts of titanium magnetic drill tools for oil and gas drilling. 2.1 Personnel engaged in magnetic particle inspection of drill thread should obtain the qualification certificate of magnetic particle inspection issued by the industry technical supervision department with the qualification to issue certificates.
2.2 The inspector should have a certain understanding of the structure of the drill and the stress conditions under it, as well as general knowledge. 3 Magnetic suspension
3.1 The magnetic powder should have high magnetic permeability and low coercivity, and the shape should be needle-shaped and long. The magnetic weighing should be greater than or equal to 7g. The particle size of the magnetic powder should be uniform and screened with a sieve of not less than 200 mm. 3.2 Fluorescent magnetic suspension uses light kerosene (50% transformer oil and kerosene can also be used) as a dispersant, and 2~3 jin of fluorescent magnetic powder is added to each liter of dispersant.
3.3 Non-fluorescent magnetic suspension, the dispersant is the same as 3.2, and 15--30g of magnetic powder is added to each liter of dispersant. 3.4 The kinematic viscosity of the dispersant for magnetic suspension should be 1.5×10-t2×10-^m2/s at 20°C. 4 Magnetization method
The AC/DC line method is adopted, and other magnetization methods are not excluded. 5 Workpiece requirements
5.1 The surface of the drill thread to be inspected should be brushed within 30mm. 5.2 When there are foreign objects affecting the display on the inspected surface, they should be removed. 5.3 The surface of the drill thread should be dry before inspection. 6 Standard test piece
6.1 The standard test piece for magnetic particle inspection is made of industrial pure iron. A circular groove is machined on the surface of the test piece. It is machined into 3 groups according to the size of the groove. The shape and size meet the requirements of Figure 1 and Table 1. 6.2 When using, make the side without groove face outward, and stick the sticky tape to the inspected surface E, but do not cover the groove of the test piece with the sticky tape. 6.3 The standard test pieces shall be selected for comparison according to the sensitivity requirements of drilling tool flaw detection, and a group of 7/50, 15/50, and 30/60 is recommended. Approved by the Ministry of Energy of the People's Republic of China on April 27, 1992 and implemented on October 1, 1992
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7 Flaw detection methods
7.1 Residual magnetism method
SY/T 5448-92
h/d--Test piece mark;
&Thickness of test piece:
.--Depth of the circle on the trial production
degrees (n)
The residual magnetic induction intensity of the drill thread measured by a field strength meter must be greater than or equal to 10.8T, and the straightening force must be greater than or equal to 800A/7.1.1
7.1.2 Magnetization The magnetizing coil should be concentric with the drill thread, and the axial position of the coil should make the end face of the drill thread protrude 20mm. The power-on time for each time is 0.5~~1s. Repeat the power-on 3~5 times before stopping the magnetization. 7.1.3 Magnetization specification: The magnetic field strength at the center of the line diagram measured by the field strength meter using the residual magnetism method should be 2.4×10*A/m. .2 Continuous method
7.2.1 The residual magnetic induction strength of the drill thread material does not meet the requirements of 7.1.1, and the continuous method should be used for flaw detection. 7,2.2
The position of the magnetization coil is the same as that of 7.1.2
7.2.3 The magnetic field strength at the center of the coil measured by the field strength meter is 8×10*A/rn. 7.3 Spraying magnetic suspension
When using the residual magnetism method, spray the magnetic suspension immediately after stopping magnetization. 7.3.1
When using the continuous method, the magnetic suspension must be sprayed while magnetizing. After the magnetic suspension is sprayed, stop magnetizing for 1 minute and then magnetize again: times. 7.3.3
The magnetic suspension should be fully stirred before use.
了.3.4 The magnetic suspension should be evenly sprayed on the entire surface to be inspected, and the spraying pressure should be 0.02～0.03MPu. 7.4 Magnetic trace observation
7.4.1 When using fluorescent magnetic powder, it must be observed in a dark area using ultraviolet light. The illumination of the observation environment should not be greater than 101×, and the illumination of ultraviolet light at 40cm from the lamp should not be less than -T-1×103uW/cm2. 7.4.2 When using non-fluorescent magnetic powder, it must be carried out under sunlight or lighting that can fully identify magnetic traces. The illumination of the inspected area should not be less than F1.5×101x. bzxz.net
7. 5 Magnetic trace recording
SY/T5448-92
Any defective magnetic traces found should be recorded by pasting or photography. Magnetic trace judgment
No cracks are allowed in the threaded part of the drill bit. 9.1 The flaw detection report shall contain no less than the following contents: name of the flaw detection personnel, qualification certificate number, detection date, location, team, drilling tool name, thread model, flaw detection type, magnetization specification, magnetic suspension type: defect nature, defect location, magnetic trace record, judgment conclusion, operator signature, and person in charge signature. 9.2 Fill in the flaw detection report immediately after each flaw detection. Additional remarks: This standard was proposed by the Shishan Pipe Material Professional Standard Promotion Committee. This standard was drafted by the First Exploration Company of the North China Petroleum Administration Bureau. The main drafters of this standard are Liu Jiahua, Wang Xiuliang, and Xian Junda. 3 This standard continues to be effective after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.
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