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GB/T 15560-1995: Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluids Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Similar standardsGB/T 15560-1995: Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluids---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT15560-1995 GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluids ISSUED ON: MAY 2, 1995 IMPLEMENTED ON: DECEMBER 1, 1995 Issued by: State Bureau of Quality and Technical Supervision Table of Contents1 Subject contents and application scope ... 3 2 Normative references ... 3 3 Terminology ... 3 4 Test principle ... 4 5 Sealing joints ... 4 6 Test equipment ... 4 7 Specimens ... 5 8 Test conditions and pretreatment ... 5 9 Test steps ... 6 10 Calculation ... 7 11 Test report ... 7 Appendix A Sealing joints (Informative) ... 8 Appendix B Gas pressurization system (Informative) ... 11 Additional information ... 11 Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluids1 Subject contents and application scopeThis standard specifies test methods for short-time hydraulic failure and resistance to pressure of the plastic pipes for fluid transportation. This standard is applicable to various types of thermoplastic pipes and thermosetting- reinforced plastic pipes for fluid transportation.2 Normative referencesGB 8806 Plastics piping systems - Plastics components - Determination of dimensions3 Terminology3.1 Failure: It refers to the continuous loss of pressure through the liquid in the sample. Failure can be one of the following forms or a combination of the following forms. a. Ductile failure: It refers to the rupture of the specimen accompanied by plastic deformation or local spherical expansion. NOTE: The slight expansion of the specimen due to creep caused by long-term stress does not belong to ductile failure. b. Brittle failure: It means that there is no obvious material deformation in the fracture area of the specimen, such as extension and necking; at this time, the test pressure does not show a yielding phenomenon, the specimen ruptures instantly, and the pressure drops rapidly to zero. c. Leakage and seepage: It refers to the liquid in the specimen seeping out through the tiny cracks in the pipe wall under the action of pressure. If the test pressure is reduced at this time, the pipe specimen will usually not experience liquid loss.4 Test principleThis test method is divided into two test types: the short-time failure test and the resistance to pressure test. The short-time failure test refers to the rapid and continuous application of liquid pressure to the interior of a given section of the plastic pipe specimen, causing the specimen to rupture in a short period of time. The pressure value when the specimen ruptures is read and its hoop stress is calculated. The resistance to pressure test is to subject a given section of plastic pipe specimen to a specified constant internal pressure for a given period of time and observe whether the specimen is damaged. The test pressure value and test time are determined by the product standard of the pipe.5 Sealing jointsSealing joints are installed at both ends of the specimen. The joints are reasonably designed to seal the specimen and the pressure device. The joints installed on the specimen cannot cause the specimen to bear axial force or cause damage to the specimen. It is recommended to use the sealing joints in Appendix A (informative).6 Test equipment6.1 Constant temperature control system The constant temperature system consists of a constant temperature bath, a fluid circulation or stirring device, a heating and temperature control device, etc. Regardless of whether the heating medium in the constant temperature bath is water, air or other fluids, the temperature is maintained within a deviation of ±2 °C. 6.2 Pressure system 6.2.1 The pressure-applying device is required to gradually and steadily raise the pressure to the specified value, and then maintain the pressure within a deviation of ±2% throughout the test. 6.2.2 For the short-time failure test, the pressure device is required to have sufficient pressure capacity to complete the specimen rupture within 60~70 seconds. It is recommended to use the gas pressurization system shown in Appendix B (informative). 6.2.3 The pressure system can apply pressure to a single specimen or to multiple specimens simultaneously through a system branch. In the case of a system branch, each pressure branch is required to have a controllable shut-off valve and each specimen branch has its own pressure gauge. When a specimen ruptures, the pressure control system can close the branch to prevent the pressure of specimens on other branches from dropping (it is recommended to use an electric-contact pressure gauge for control or similar pressure control systems). 6.3 Pressure gauge 6.3.1 The accuracy of the test pressure gauge shall not be lower than Grade 1.0. 6.3.2 The range scale of the pressure gauge shall be selected so that the pressure value reading is around 60% of the pressure gauge scale. Each specimen is required to have a pressure gauge, and the pressure gauge shall be equipped with a pressure buffer protection device. 6.4 Timing device The timer is accurate to within ±2%.7 Specimens7.1 The surface of the specimen shall not have visible cracks, scratches or other defects that affect the test results. Both ends of the specimen shall be flat and perpendicular to the axis of the pipe. 7.2 Specimen length: Unless otherwise specified in the product standard, the effective length L of the specimen between two sealed joints shall comply with the requirements of the following table. Nominal outer diameter D< 160 mm L=5D, but not less than 300 mm Nominal outer diameter D≥160 mm L=3D, but not less than 760 mm 7.3 Number of specimens Under the same test conditions, the number of specimens shall not be less than 5. Or, the number of specimens shall be determined according to the provisions of the product standard.8 Test conditions and pretreatment8.1 The test temperature shall be in accordance with the test conditions specified in the product standards. 8.2 Liquid pressure must be applied inside the specimen, such as water. If other media are used, it must be ensured that the liquid does not corrode the specimen. 8.3 The environment outside the specimen can be a liquid or gas environment. The temperature of the external environment must be the same as the temperature of the liquid inside the specimen. 8.4 The specimen shall be pretreated before pressure is applied. The pretreatment temperature shall be the same as the test temperature. The pretreatment time shall be such that the specimen reaches the test temperature. For the test at 23 °C, when the specimen is immersed in liquid, the pretreatment time shall be not less than 1 h. When the specimen is placed in a gas medium, the pretreatment time shall be not less than 16 h.9 Test steps9.1 Install the sealing joints on the specimens. Fill each specimen with liquid at the test temperature, remove the air from the specimen, and then pretreat it according to 8.4. 9.2 Connect the specimen to the pressure device and support the specimen to prevent bending and deflection of the specimen due to the weight of the pipe and joints (the support shall not cause longitudinal and radial constraints on the specimen). 9.3 Apply test pressure to the specimen 9.3.1 During the short-time failure test, apply pressure to the specimen continuously, evenly and quickly, and start timing at the same time until the specimen ruptures. If the specimen ruptures in less than 60 seconds, reduce the pressure application speed and repeat the test until the specimen ruptures in 60~70 seconds. Record the pressure and time when the specimen ruptures and the rupture state of the specimen. 9.3.2 During the resistance to pressure test, continuously and evenly apply the pressure to the specimen to the given value, and then start timing. During the entire test process, keep the pressure constant and meet the requirements of 6.2.1. After the specified time is reached, record the test results and the rupture status of the specimen. 9.4 When the failure occurs within one diameter from the joint, if there is a reason to confirm that the failure is caused by some defect in the sample itself, the specimen is valid; otherwise, take another specimen and retest.Appendix ASealing joints (Informative) A1 As shown in Figure A1, the joints are rigidly connected to the specimen; the lower joint, whose weight is carried by the specimen, bears the back pressure. This type of joint is suitable for hard pipes with good roundness, such as PVC, PP and other pipes. A2 As shown in Figure A2, a sealing joint with an annular sealing ring is installed on the outer surface of the specimen. A metal rod inside the specimen is connected to the sealing joint at the other end. The specimen can move longitudinally to a certain extent between the two joints, and pressure is applied to the specimen through the hollow end of the metal rod. This type of joint is suitable for hard pipes with good roundness, such as PVC, PP and double-wall corrugated pipes. For the assembly of the corrugated pipe sealing ring, metal joint and specimen, see Figure A7. A3 As shown in Figure A3, a sealing joint with an annular sealing ring is installed on the inner surface of the specimen and connected to the sealing joint at the other end through a metal rod. The specimen can move longitudinally to a certain extent between the two joints. This type of joint is suitable for hard pipes with good roundness, such as PVC, PP and other pipes. A4 As shown in Figure A4, both ends of the specimen are immersed in an oil bath at 120~130 ℃ and heated until soft; then, one end is put on the inner flange with an inclined plug and the outer flange with the same inclination, bolted and tighten evenly. The other sealing joint is installed in turn. The test pressure is applied to the specimen through the sealing joints. This type of joint is suitable for hard pipes and hoses with thick walls and poor roundness, such as PE, PVC and other thermoplastic plastic pipes. A5 As shown in Figure A5, insert the tapered pipe plug into the specimen, and put a tapered pipe sleeve on the outside of the pipe. Then, put on the nut and tighten it with the thread of the plug. Apply the test pressure to the specimen from the other joint. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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