JT/T 496-2018 (JT/T 496-2004) PDF EnglishUS$210.00 · In stock · Download in 9 seconds
JT/T 496-2004: High-density polyethylene silicon duct for highway communication conduit Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete JT/T 496: Historical versions
JT/T 496-2004: High-density polyethylene silicon duct for highway communication conduit---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/JTT496-2004JT TRANSPORTATION INDUSTRIAL STANDARD ICS 23.040.20, ICS 93.080.30 P 66 Record Number High-density polyethylene silicore duct for highway communication conduit 高密度聚乙烯硅芯塑料管 Issued on: MARCH 17, 2004 Implemented on: JUNE 1, 2004 Issued by. Ministry of Transport of PRC Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Product classification and naming... 5 4 Technical requirements... 7 5 Test methods... 10 6 Inspection rules... 15 7 Marks, packaging, transport and storage... 18 Annex A... 20 Annex B... 22 Annex C... 24 Annex D... 26 Annex E... 29 Annex F... 31 References... 34ForewordThe technical indexes and test methods in this Standard partially refer to ASTM D3485-97 “Standard Specification for Coilable High Density Polyethylene (HDPE) Cable in Conduit (CIC)”, US Bellcores TR-NWT-000356 “General Technical Requirements for Optical Cable Protective Duct” and NEMA TC7-1990 “Smooth-wall Coilable Electrical Polyethylene Conduit”. Annex A, Annex B, Annex C, Annex E, and Annex F are normative; Annex D is informative. This Standard was proposed by China Research Institute of Highway of the Ministry of Transport. This Standard shall be under the jurisdiction of National Technical Committee on Transportation Engineering Facilities (Highway) of Standardization Administration of China (SAC/TC223). Main drafting organizations of this Standard. China Research Institute of Highway of the Ministry of Transport Drafting organizations of this Standard. Jiangsu Guoda Suit Complete Co., Ltd., Fujian Aton Plastics Co., Ltd. Main drafters of this Standard. Han Wenyuan, Che Zhisheng, Zhang Zhiyong, Kuang Jinhe, Chen Que, Tang Guoliang and Shan Ruimin. High-density polyethylene silicore duct for highway communication conduit1 ScopeThis Standard specifies product classification, designation, technical requirements, test methods, inspection rules, marks, packaging, transport and storage of high density polyethylene silicore duct for highway communication conduit (hereinafter referred to as silicore duct). This Standard is applicable to high density silicore protective duct used by communication optical cable or cable paved under highway. For multi-pore high density polyethylene duct, it shall use this Standard as reference. This Standard is not applicable to protective duct used by communication optical cable or cable which is directly exposed under sunlight.2 Normative referencesThe following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 191-2000 Packaging - Pictorial marking for handling of goods GB/T 1039-1992 Plastics - General rules for the test method of mechanical properties GB/T 1408.1-1999 Methods of test for electric strength of solid insulating materials - Tests at power frequencies GB/T 1842-1999 Test method for environmental stress - Cracking of polyethylene plastics GB/T 2411-1980 Plastics - Determination of hardness by means of a durometer (shore hardness) GB/T 2828-1987 Sampling procedures and sheets for inspection by attributes (applicable to continuous batch product inspection) GB/T 2918-1998 Standard atmospheres for conditioning and testing of plastic specimens GB/T 3682-2000 Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics GB/T 5470-1985 Test method for brittleness temperature of plastics by impact GB/T 6671-2001 Thermoplastics pipe - Determination of longitudinal reversion GB/T 8804.2-1988 Test methods of tensile properties for thermoplastic pipes - Polyethylene (PE) pipes GB/T 8806-1988 Plastics piping systems - Plastics components - Determination of dimensions YD/T 841-1996 Plastic pipe for buried communication conduit3 Product classification and naming3.1 Structure Silicore duct consists of high density polyethylene (HDPE) outer wall, color bar on the external layer and permanent solid siliceous lubricating layer. The structure of cross section is shown in Figure 1. 3.2 Classification 3.2.1 Classification by structure. - Smooth solid inner wall and outer wall of silicore duct, expressed by English capital letter S; - Silicore duct with smooth outer wall and inner wall carried with longitudinal rib, expressed by English letter R1; - Silicore duct with outer wall carried with rib and smooth inner wall, expressed by English letter R2; - Silicore duct with outer wall and inner wall carried with rib, expressed by English letter R3. air-tightness of plug shall satisfy the water tightness requirements.5 Test methods5.1 State regulation and standard test environment Unless otherwise specified, specimen shall be regulated for 24h at 23°C± 2°C under the conditions stipulated in GB/T 2918-1998.Test shall be carried out under such conditions. 5.2 Test instruments and preparation 5.2.1 The accuracy level of load sensor universal material testing machine used in test shall be lower than grade 1 and the accuracy level of length measuring tool, for steel ruler, not lower than grade 2 and for others, not lower than grade 1. 5.2.2 Unless otherwise specified, the sampling and specimen preparation for tensile test and the adjustment and operation of test machine shall be in accordance with GB/T 1039-1992. 5.3 Appearance inspection Visually observe the specimen under the natural light condition. 5.4 Measurement of dimensions of silicore duct Dimensional measurement shall comply with the relevant provisions given in GB/T 8806-1988.The measurement of length prefers the use of the flexible rule, division of 1 mm. The measurement of outer diameter prefers the use of vernier caliper, division of 0.02 mm. In measurement of wall thickness, the impact of the pressure applied on the specimen to the measurement result when using measuring tool shall be considered. In such case, the use of wall thickness micrometer gauge with the division of 0.01 mm is preferred. The measurement of ovality shall be in accordance with the provisions given in Annex B. 5.5 Physical-chemical properties 5.5.1 Outer wall hardness Cover 100 mm long silicore duct around a metal rod with appropriate outer diameter. Put it below D Shore durometer. Measure the hardness of its outer wall according to the method stipulated in GB/T 2411-1980.The instant hardness displayed in durometer is taken as the measurement result. The average of five tests is taken as the final hardness. 5.5.2 Inner wall friction coefficient 5.5.2.1 Static inner wall friction coefficient can be obtained in accordance with the method given in Annex C. 5.5.2.2 In the condition that manufacturing process or formula improvement scheme has been confirmed, in the case of manufacturer using the dynamic inner wall friction coefficient for comparative test, the dynamic inner wall friction coefficient test shall be carried out in accordance with Annex D. NOTE. The official standard for the method of dynamic inner wall friction coefficient is in the preparation process. This article will be withdrawn after the official issuance of Standard in the preparation process. 5.5.3 Tensile strength Clamp five blanking specimens obtained in accordance with the method given in GB/T 8804.2-1988 on the test machine and then stretch them at the speed of 100 mm/min until they are broken. Take down the maximum tensile value during the tension process which is taken as the test result. The average of the results of five valid tests is taken as the final test result. 5.5.4 Elongation at break Stretch five blanked specimens which are obtained in accordance with the method given in GB/T 8804.2-1988 at the speed of 100 mm/min... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
