GOST R ISO 10543-99
GOST R ISO 10543−99 pressure steel Tubes seamless and welded drawn or hot worked. Method for ultrasonic thickness measurements
GOST R ISO 10543−99
Group В69
STATE STANDARD OF THE RUSSIAN FEDERATION
OF STEEL PIPE PRESSURE SEAMLESS AND WELDED DRAWN OR HOT WORKED
Method for ultrasonic thickness measurements
Seamless and hot-stretch-reduced welded steel tubes for pressure purposes. Ultrasonic thickness testing
OKS 19.100
AXTU 0009
Date of introduction 2001−01−01
Preface
1 DEVELOPED AND SUBMITTED by the Technical Committee for standardization TC 132 «Technical diagnostics"
2 ADOPTED AND put INTO EFFECT by the Resolution of Gosstandart of Russia from December 23, 1999 No. 674-St
3 this standard is the authentic text of international standard ISO 10543−94* «steel pressure Pipe seamless and welded drawn or hot worked. Ultrasonic thickness gaging"
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* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.
4 INTRODUCED FOR THE FIRST TIME
5 REISSUE
Introduction
This standard applies to the ultrasonic inspection method wall thickness seamless and welded drawn or hot worked steel pipes.
The standard sets requirements to the procedure of using methods of ultrasonic thickness measurement requirements for personnel conducting monitoring, and the basis of the relationship between the consumer and the manufacturer of the pipes.
1 Scope
1.1 this standard establishes requirements for the method of ultrasonic wall thickness measurement of seamless and welded drawn or hot worked steel pipes.
Notes
1 this standard may also be applied to welded (except made arc submerged arc welding) pipes on the basis of an agreement between the consumer and the manufacturer.
2, the thickness Control of pipes, referred to in this standard, does not mean that it is necessary to conduct 100% scanning of their surface.
In the absence of special instructions contained in the product standard or agreement between the consumer and the manufacturer scanning the surface of the pipe is carried out in accordance with 4.2.
This control can be carried out simultaneously with ultrasonic inspection of the pipe performed to determine the presence of delamination (GOST R ISO 10124) using the same ultrasonic transducers for both inspection types.
In this case, the relative surface area of the pipe to be scanned must be determined based on the minimum size of the bundle found in accordance with GOST R ISO 10124.
1.2 this standard is applicable to measure wall thickness of tubes with outside diameter not less than 25,4 mm and a minimum wall thickness of 2.6 mm.
2 Normative references
In this standard, reference the following standard:
GOST R ISO 10124−99 pressure steel Tubes seamless and welded (except pipe manufactured by arc welding under flux). Ultrasonic testing method of delamination
3 General requirements
3.1 Ultrasonic inspection of pipes governed by this standard generally carried out after completion of all manufacturing operations that affect the thickness of the pipe.
Monitoring should be conducted by personnel certified (certificated) in accordance with a valid certification and is assigned by the manufacturer.
In the case of control by a third party this must be agreed between customer and manufacturer.
3.2 Curvature of the pipe and the condition of the surface must meet the requirements of the applicable instruments ultrasonic testing.
4 Method of control
4.1 To determine compliance of the wall thickness of the pipe to the specified requirements apply pulse-echo method using one — or multiply reflected ultrasonic pulses emitted perpendicular to the surface of the pipe.
4.2 During the test, the pipe and (or) ultrasonic transducer must move relative to each other so (with the exception of cases described in note 2, 1.1) to the pipe surface is scanned at equidistant helical lines along the length of the pipe when the step is not more than 150 mm.
4.3 the Maximum size of each of the applied ultrasonic transducer, measured parallel to the axis of the tube should not be more than 25 mm.
4.4 Ultrasonic unit must ensure that grading of pipes (good and bad) through automatic operation at set value rejection level combined with a marking system and (or) sort.
5 Standard samples
5.1 Ultrasonic instrument is calibrated using a standard sample having acoustic properties similar to the acoustic properties of the testing pipe. The standard sample should be tubular or partially tubular, having the same nominal diameter as the steel pipe is controlled.
5.2 Standard model on the manufacturer’s choice, may also:
— have a known thickness;
— keep the treated area with a thickness that differ from the given.
The thickness of the standard sample used for calibration of ultrasonic equipment shall be set with an accuracy of ±0.05 mm or ±0.2% of the maximum thickness.
6 Calibration and control of test equipment
6.1 the Equipment must be calibrated using a selected standard sample so that the thickness of the standard sample was determined with accuracy not less than ±0.10 mm or ±2% of maximum thickness and so that the generated signal rejection level whenever reached (achieved) the limit (limit) the thickness value.
6.2 during the calibration equipment relative speed of rotation and displacement should be selected so that the pipe surface is scanned with a step not more than 150 mm in accordance with 4.2.
6.3 calibration Check should be carried out at regular intervals during the production testing of tubes of the same gauge using the selected standard sample. The frequency of calibration verification must be at least 4 h or once every 10 pipes is controlled regardless of the length control. In addition, the calibrations need to be done always when there is a change of brigade operators serving equipment, and at the beginning and end of the production cycle.
Note — In cases where production control is carried out during an entire work shift, a 4-hour period may be extended by agreement between the consumer and the manufacturer.
6.4 the Equipment must be re-calibrated after any adjustments to the system or always, when there is a change in the mix of controlled pipes.
6.5 If, after the calibration verification requirements calibration are not satisfied even after increasing the sensitivity taking into account the comments 6.5.1, all tubes inspected since the previous calibration must be re-inspected after the re-calibration of equipment.
Repeated monitoring is not necessary after the increase of the measurement error of thickness due to the drift of the system more permissible 6.5.1 with the appropriate recording, providing the grading of pipes.
6.5.1 permitted the drift of the system, leading to additional error of measurement of thickness is within ±1% or ±0,05 mm maximum. This should be considered during the calibration of the equipment.
7 Acceptance
7.1 Any pipe, its characteristics are not exceeding the acceptance level, it is considered the last control.
7.2 Any pipe, its characteristics are exceed the acceptance level, it is considered defective or at the request of the manufacturer can be controlled again.
7.3 If the re-monitoring the acceptance level is exceeded, the tube is considered the last control. When exceeding the rejection level, the pipe is considered defective.
7.4 For the defective pipe should be taken one or more of the following measures in accordance with the requirements of the standard for products:
— the manufacturer can convincingly prove to the consumer that the conditions for rejection of the pipe occurred due to summation of signals from minor defects (such as groups of inclusions), which do not result in unacceptable deviations of the properties of the pipe. Such a pipe is considered the last control;
— questionable areas of the pipes with a thickness less than or greater than the permissible level can checked additional method*. If after the check it is established that the residual wall thickness of the tube is in the range between the allowable minimum and maximum values, such a pipe is considered the last control;
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* The text of the document matches the original. — Note the manufacturer’s database.
— questionable tubes containing small localized areas of thickness less than or and less or more than the allowable limits, can be classified as accepted only if there is agreement between the manufacturer and the consumer;
— questionable plot to be cut out. The manufacturer must guarantee to the consumer that all questionable areas are removed.
Otherwise, the pipe fail inspection.
8 test report
After the inspection, the manufacturer shall submit consumer test report which as a minimum includes the following information:
— reference to this standard;
— the date of the inspection;
— official document about the quality of the pipe, held the control;
— the gauge tube and the batch number;
— the composition and type of equipment used;
— a description of the standard model.
| OKS 19.100 | В69 | AXTU 0009 | ||
| Key words: pipe steel, ultrasonic method, standard samples, calibration, test equipment | ||||
