Diploma of gas supply in Baiguzino village

1 application area

This standard applies to polyethylene pressure pipes for underground gas pipelines (hereinafter - pipes) transporting combustible gases intended as raw materials and fuels for industrial and public use.

Mandatory requirements for products aimed at ensuring their safety for life, health and property of the population and environmental protection are given in table 2, except for indicator 9.

2 regulatory references

This standard refers to the following standards:

GOST 9.70883 EHSS. Plastics. Methods of aging testing under the influence of natural and artificial climatic factors

GOST 12.1.04489 SSBT. Fire and explosion hazard of substances and materials. Key Figure Nomenclature and Methods

GOST 12.3.03083 SSBT. Processing of plastic masses. Safety requirements

GOST 12.4.12183 SSBT. Industrial filtering gas masks. Specification

GOST 16689 Shtangentsirkuli. Specification

GOST 57768 Hourly type indicators with a fission price of 0.01 mm. Specification

GOST 94973 Small and medium volume steel cylinders for gases at Pp19.6 MPa (200 kgf/cm2). Specification

GOST 558378 Gaseous technical and medical oxygen. Specification

GOST 650790 Micrometers. Specification

GOST 750298 Metal measuring roulettes. Specification

GOST 803284 Preferred numbers and rows of preferred numbers

GOST 929374 Gaseous and liquid nitrogen. Specification

GOST 1126280 Plastics. Method of tensile testing

GOST 1135889 Indicator thickeners and wall meters with a fission price of 0.01 and 0.1 mm. Specification

GOST 1164573 Plastics. Method for determination of melt flow index of thermoplastics

GOST 1242366 Plastics. Conditions of sample conditioning (samples)

GOST 1419296 Cargo marking

GOST 1513969 Plastics. Density (bulk) methods

GOST 1515069 Machines, instruments and other technical products. Performances for different climatic areas. Categories, conditions of operation, storage and transportation in terms of environmental climatic factors

GOST 1633885 Low pressure polyethylene. Specification

GOST 1943388 Dangerous goods. Classification and marking

GOST 2165076 Means of fastening tarn-piece cargoes in transport packages. General requirements

GOST 2223576 Freight railway wagons of 1520 mm gauge. General safety requirements for handling and shunting operations

GOST 2415780 Plastic pipes. Method for determination of persistence at constant internal pressure

GOST 2631184 Polyolefins. Carbon Black Method

GOST 2635984 Polyethylene. Method for determining the content of volatile substances.

GOST 2707886 Thermoplastics pipes. Methods for determining the change in pipe length after heating

GOST 12.1.00588 SSBT. General sanitary and hygienic requirements for the working area air.

GOST 2627784. Plastics. General requirements for machining of samples.

GOST 17.2.3.02 - 78 Nature protection. Atmosphere. Rules for establishing permissible emissions of harmful substances by industrial enterprises

GOST 12162 - 77 Solid carbon dioxide. Specification

GOST 28084 - 89 Low-freezing cooling fluids. General Specifications

GOST 29325 - 92 (ISO 3126 - 74) Pipes made of plastics. Sizing.

(Revised Revision, Rev. № 1, 2, 3).

3 definitions

3.1 The following terms are used in this standard with the corresponding definitions:

3.1.1. Standard sizing ratio SDR: Ratio of nominal outer pipe diameter d to nominal wall thickness e.

3.1.2. minimum long-term strength MRS in megapascals: Stress determining the property of polyethylene grades used for the manufacture of pipes, obtained by extrapolation for a service life of 50 years at a temperature of 20C of these pipe tests for resistance to internal hydrostatic pressure with a lower confidence interval of 97.5% and rounded to the nearest lower value of row R10 according to GOST 8032.

Procedure for design and approval of visual control samples

E.1 The reference sample shall be a length (500 ± 10) mm of pipe with marking on the surface of the pipe taken from a serial batch of pipes manufactured in accordance with the requirements of this standard. The pattern must be cut perpendicular to the pipe axis.

E.2 Reference samples of the appearance of the pipe surface shall be drawn up for one representative from each pipe group by diameter in accordance with 7.2, and they shall be reference samples for all standard SDR group dimensions.

(Revised Revision, Rev. № 3).

E.3 Each control sample shall be provided with a sealed label indicating:

- pipe symbol;

- manufacturer's name;

- approval stamp of the control sample by the chief engineer of the manufacturer, confirmed by a round seal indicating the date of approval;

- approval stamp with the standard developer or any test laboratory (center) accredited in the field of testing pipes and connectors made of plastics

E.4 If changes are made to the list 1 of Table 2 of this standard, the samples shall be re-approved.

E.5 Control samples shall be stored at the manufacturer.

Method for determination of atmospheric resistance

G.1 Atmospheric resistance (aging under the influence of natural climatic factors) is determined according to GOST 9.708 (method 1) on pipes with a diameter of 32 mm with SDR 11 or a diameter of 63 mm with SDR 11 that meet the requirements of this standard.

Tests are carried out on samples in the form of a pipe length of about 1 m.

The working surface of the sample should be oriented south at an inclination angle of 45 ° to the horizon line.

Duration of test is determined by data of irradiation energy (intensity of total solar radiation) taken from results of meteorological observations at climatic stations.

After irradiation with E3.5 GJ/m2 energy, the samples were repeatedly tested for: thermal stability, elongation at break, resistance at constant internal pressure (165 hours at 80 ° C).

Note - When testing for thermal stability after irradiation, the surface layer (chips) with thickness of 0.2 mm is removed from pipe sections before production of tested samples

Samples shall be deemed to have passed the weatherability test if the test results meet the requirements of Table D.1.