RU2338946C1 - Method of tubes preparation for reutilisation (versions) - Google Patents

Abstract

FIELD: processes; construction.

SUBSTANCE: according to geometrical parameter an according to degree of corrosive wear it is implemented primary screening of having/don't having insulation of faced or non-faced disassembled during repair of tubes pipelines or tubes with time of manufacture more than one year, tubes are marked, it is implemented complex additional supervision, examination with initial treatment of non-faced tubes' butts, tubes with maintainable defects are directed to the preparation for reutilisation, they are effected to restorative maintenance with implementation of quality control. External surface of tubes is prepared for insulation, it is implemented control of tubes prepared surface, it is insulated external surface of tubes, there are marked suitable for reutilisation tubes with further execution of quality documentation for tubes. Admitted during the survey process, examination and repair worthless fore utilisation tubes are rejected with further usage of rejected as defective tubes in process pipeline systems.

EFFECT: economy of tubes.

4 cl

Description

The invention relates to the construction of pipeline transport and for pipes disassembled from gas pipelines during the overhaul of their linear part, relates to resource-saving technologies that allow reuse of pipes, including for subsequent installation of the linear part of the main gas pipelines.

Known from the prior art, a method for identifying sections of trunk pipelines predisposed to stress corrosion (see RU 2147098C1, 03/27/2000). The method is carried out by analysis of the design and actual position of the pipeline. The type of diagnosis is assigned depending on the length of individual sections and the total lesion of more than 50% of the length of the sections between the cranes and the launch-receiving chambers of flaw detectors. Based on the diagnostic results, a type of preventive or repair work is prescribed that ensures the reliability of the pipelines. A disadvantage of the known solution is the lack of methods and means of determining the suitability of the pipes for reuse.

The prior art mechanized lines for the preparation of oilfield pipes for use in workshops of pipe bases of production enterprises of the oil and gas industry. The flow-mechanized pipe processing line is known, which contains a gauge machine, pipe cutting machines, machines for winding couplings, rings and nipples, devices for measuring the length and marking of pipes (see SU 1424904) installed along the technological process by vehicles .

A known line containing vehicles connected to vehicles for removing safety parts from pipe ends, devices for pipe lengths, patterning, thread control, an installation for hydraulic testing of pipes and a device for marking (see. "Oil assortment pipes." Reference Guide, ed. A.E.Saroyan.M.: Nedra, 1987, p. 425-426).

However, the known line does not provide a comprehensive solution to the problem of selection and preparation of pipes for reuse in MG.

The well-known "Temporary instructions for the re-use of pipes in the overhaul of the linear part of the main gas pipelines", Moscow, OAO Gazprom, 2005.

The instruction regulates the procedure for preparing for reuse of longitudinally welded pipes, technical requirements for reusable pipes, methods, technology of work and execution of quality documents for pipes. However, establishing general methods and a standard procedure for preparing pipes for reuse, the instruction indicates that "depending on the specific conditions, the sequence and content of the individual stages of the work ... can be clarified." In addition, the instruction does not define methods for the restoration of these pipes.

Thus, there is the task of developing a method of preparing pipes for reuse in gas pipelines.

This problem is solved by the method of preparation for reuse of pipes, mainly steel, in which, according to the geometric parameters and the degree of corrosion wear, the primary screening of non-insulated, endless or non-faceted pipes or pipes dismantled during pipeline repair with a production period of more than one year is carried out, the pipes are marked, carry out a comprehensive additional inspection, examination with pre-treatment of the ends of non-finished pipes, pipes with repairable defects They are sent for preparation for reuse, subjected to restoration repair with quality control, the outer surface of the pipes is prepared for insulation, the prepared surface of the pipes is monitored, the outer surface of the pipes is insulated, pipes suitable for reuse are marked, followed by a quality document for pipes, Pipes recognized in the process of inspection, examination and repair as unsuitable for reuse defective pipes in technological pipeline networks, such as water supply, as building elements, such as piles, or sent to scrap.

In the particular case of the method, when carrying out quality control tests recognized as suitable for re-use, the pipes carry out their strength analysis and / or feed the pipes to a test bench, where the pipes are checked with a given test pressure.

These operations increase the reliability of the constructed pipelines, leading to significant pipe savings.

This problem is solved by a variant of the preparation method for the reuse of metal pipes, mainly steel ones, in which, according to the geometric parameters and the degree of corrosion wear, the primary screening of the endless or non-faceted pipes or pipes dismantled during pipeline repair with a production period of more than one year is carried out, the pipes are marked transport them to the plant, in basic conditions, according to the results of the strength analysis, they clean the pipes from old insulation, carry out their comp An additional additional inspection, examination with preliminary processing of the ends of the non-truncated pipes, while the pipes with repairable defects are sent for preparation for reuse, subjected to restoration repair with quality control, the outer surface of the pipes is prepared for insulation, the prepared surface of the pipes is monitored, the outer surface is insulated pipes, mark pipes suitable for reuse with the subsequent execution of a quality document for pipes, pipes, that are recognized as unsuitable for reuse during the inspection, survey and repair process, they are rejected with the subsequent use of rejected pipes in technological pipeline networks, for example, water supply, as building elements, such as piles, or sent to scrap metal.

In the particular case of the implementation of the method, when carrying out quality control recognized as suitable for reuse, the pipes carry out their strength analysis and / or feed the pipes to a test bench, where the pipes are checked with a given test pressure.

The invention explains the sequence of operations for preparing, for example, steel pipes dismantled from gas pipelines (MG) in the process of overhaul.

Re-use pipes are pipes dismantled from gas pipelines that have undergone preliminary inspection and rejection under route conditions, and have also undergone a comprehensive examination, technical examination of unidentified pipes, repairs and other technological operations in factory or basic (workshop) conditions.

Pipes repaired without removal from the trench, as well as pipes removed from the trench, repaired on the edge and mounted within the boundaries of the repaired area defined by the design documentation (ranging from crane to crane) are not reuse pipes.

When describing the claimed group of inventions, the following terms are applied with the corresponding definitions.

Identification - the procedure for establishing the conformity of a pipe to a quality document issued to it. An identified pipe is a pipe for which its marking is consistent with the quality document issued to the pipe during its manufacture, and on which there is a marking (by branding, paint).

Unidentified pipe - a pipe that does not have a quality document (certificate) and / or is not marked with a branding, as well as a pipe for which it is impossible to establish the conformity of the marking to the quality document issued to the pipe during its manufacture (due to the poor quality of the certificate or marking).

A preliminary examination is a procedure for identifying obvious defects that exclude the possibility of reuse of pipes containing them, as well as determining the location and geometric parameters of defects.

Quality document - certificate or passport.

Comprehensive inspection of pipes - the procedure for identifying defects not detected during the preliminary examination, including non-destructive testing methods, as well as determining their location and geometric parameters.

Inspection of pipes - the procedure for establishing the compliance of pipes with requirements - TU, GOST for pipes for trunk pipelines (MG).

In the claimed method, during the overhaul of the linear part of the main gas pipelines with a working pressure of up to 7.4 MPa, the pipe sections disassembled from the main gas pipelines are cut into separate pipes. The internal cavity of the pipes is cleaned of soil and foreign objects. Category A pipe - a pipe dismantled from MG, used or with a production period of more than one year, suitable for reuse in the repair of gas pipelines in accordance with the present invention.

Category B pipe - a pipe dismantled from main gas pipelines (previously in operation), or with a production period of more than one year, not suitable for reuse in the repair of gas pipelines and intended for its further processing.

Pipes repaired without removal from the trench, as well as pipes removed from the trench, repaired on the edge and mounted within the boundaries of the repaired area defined by the design documentation (ranging from crane to crane) are not reuse pipes. Pipes of category “A” and “B” are stored separately at the places of storage.

Primary rejection is carried out according to geometric parameters and the degree of corrosion wear of non-insulated end or non-end pipes or pipes with a production period of more than one year. Category “A” pipes carry out their identification, mark pipes.

Pipes suitable for the primary screening are transported to the plant for further pipe processing. Under basic conditions, a comprehensive additional inspection and examination of pipes is carried out with preliminary processing of the ends of non-truncated pipes. So the pipes arriving at the factory site undergo an input visual and measuring control for rejecting pipes with obvious defects. A comprehensive inspection of the pipes is carried out in order to identify defects in the metal of the pipes and welded joints that were not detected during the preliminary examination, as well as to determine their location and geometric parameters. During the inspection, the geometric parameters of the pipe are measured: diameter, length, wall thickness, ovality, curvature, metal flaw detection is performed using non-destructive testing methods.

Pipes that passed the incoming inspection are divided into two groups: identified pipes, for which the marking is in compliance with the quality document (certificate) issued to the pipe during its manufacture, and on which there is a marking (branding, paint), and unidentified pipes for which there are no quality documents or it is not possible to establish conformity of the marking with the document. Pipes with old insulation are treated in basic conditions - they clean pipes from old insulation. The criteria for the suitability of the pipes for reuse are determined on the basis of the valid regulatory and technical documentation approved by the established procedure for Gazprom enterprises.

Pipes with repairable defects are sent for preparation for reuse and subjected to restoration repair with quality control. In the particular case of the implementation of the method, when carrying out quality control recognized as suitable for reuse, the pipes carry out their strength analysis and / or feed the pipes to a stand for hydraulic testing - hydraulic testing, where the pipes are checked with a given test pressure.

Prepare the outer surface of the pipes for insulation with monitoring the prepared surface of the pipes. Pipes are repaired using controlled grinding and / or welding. Grinding of corrosion damage is performed in accordance with the requirements of the WFD 39-1.10-023-2001.

Isolate the outer surface of the pipes and mark pipes suitable for reuse, followed by the execution of a quality document on the pipes.

The pipes that have undergone repairs are formed in a batch, for which the necessary documents-certificates (passports) are issued. In the certificates (passports), the pipes indicate the guaranteed test pressure for each pipe.

Unidentified pipes are formed in a batch only after examination in terms of determining the chemical composition and grade of steel. Pipe lots are formed on the basis of the following requirements: pipe pipes must be dismantled from one gas pipeline, manufactured at the same plant, pipes must have the same diameter, wall thickness, steel grade, strength class. The identified pipes are formed in the batch without survey.

Pipes recognized in the process of inspection, examination and repair as unsuitable for reuse are rejected with the subsequent use of rejected pipes in technological pipeline networks, for example, water supply, as building elements, such as piles, or sent to scrap metal.

Claims (4)

1. A method of preparing metal pipes, mainly steel, for re-use, in which, according to geometric parameters and the degree of corrosion wear, the primary screening of non-insulated end-face or non-faceted dismantled pipes during the repair of the pipeline, or pipes with a production period of more than one year, is marked pipes, carry out a comprehensive additional inspection, examination with pre-treatment of the ends of non-finished pipes, pipes with maintainable defects directed they are prepared for reuse, subjected to restoration repair with quality control, the outer surface of the pipes is prepared for insulation, the prepared surface of the pipes is monitored, the outer surface of the pipes is insulated, the pipes suitable for reuse are marked, followed by a quality document for the pipes, recognized in the process of inspection, examination and repair unsuitable for reuse, the pipes are rejected with the subsequent use of rejected pipes in industrial piping networks, such as water, as structural elements, such as piles or sent to scrap. 2. The method according to claim 1, in which when conducting quality control tests recognized as suitable for reuse, the pipes carry out their strength analysis and / or feed the pipes to a test bench, where the pipes are checked with a given test pressure. 3. A method of preparing metal pipes, mainly steel, for repeated use, in which, according to the geometric parameters and the degree of corrosion wear, the primary screening of the end-faceted or non-faceted dismantled pipes or pipes with a manufacturing period of more than one year is carried out, mark pipes they are transported to the plant, in basic conditions they clean the pipes from old insulation, they are subjected to a comprehensive additional inspection, examination with preliminary by working the ends of non-truncated pipes, while pipes with maintainable defects are sent for preparation for reuse, subjected to restoration repair with quality control, the outer surface of the pipes is prepared for insulation, the prepared surface of the pipes is monitored, the outer surface of the pipes is insulated, and markable for reuse pipes with subsequent execution of a quality document for pipes, pipes recognized in the process of inspection, examination and repair are not suitable bubbled for reuse, marriage with the subsequent use in processing the reject pipe pipeline networks, e.g. water, as structural elements, such as piles or sent to scrap. 4. The method according to claim 3, in which when conducting quality control tests recognized as suitable for reuse, the pipes carry out their strength analysis and / or feed the pipes to a test bench, where the pipes are checked with a given test pressure.