JT/T 27.30-1993 交通行业工人技术等级标准 公路运输与公路养护 汽车喷油泵调试工
作者:标准资料网 时间:2024-05-01 13:02:07 浏览:9519
来源:标准资料网
基本信息
| 标准名称： | 交通行业工人技术等级标准 公路运输与公路养护 汽车喷油泵调试工 |
| 英文名称： | Technical grade standards for workers in the communications industry -- Highway transportation and highway maintenance -- Workers of regulation test for automotive injection pump |
| 中标分类： |
公路、水路运输 >>
公路运输 >>
公路运输综合 |
| 发布部门： | 中华人民共和国交通部、中华人民共和国劳动部 |
| 发布日期： | 1993-10-19 |
| 实施日期： | 1994-04-01 |
| 首发日期： | |
| 作废日期： | 2010-04-05 |
| 提出单位： | 交通部人事劳动司 |
| 归口单位： | 交通部标准计量研究所 |
| 起草单位： | 交通部人事劳动司组织西安公路学院、陕西省交通厅、浙江省交通厅、吉林省交通厅、中国汽车运输总公司、贵州省交通厅、广西壮族自治区交通厅、上海市交通运输局 |
| 起草人： | 何兴荣、折益宁、冯西宁、侯维靖 |
| 出版社： | 人民交通出版社 |
| 出版日期： | 1994-04-01 |
| 页数： | 4页 |
适用范围
本标准规定了汽车喷油泵调试工的等级、应知、应会和工作实例。
本标准适用于汽车喷油泵调试工的培训、考核和使用。
前言
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目录
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引用标准
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所属分类： 公路 水路运输 公路运输 公路运输综合
Product Code:SAE AIR4275
Title:Jet Reference Fluid Study for Fuel Tank Sealants
Issuing Committee:Ams G9 Aerospace Sealing Committee
Scope: Standard reference fluids, or test fluids, have long been used to evaluate the effects of hydrocarbon fuels on various materials, such as integral fuel tank sealants. Standard fluids are required because hydrocarbon fuels, such as JP-4, vary widely in composition depending on crude source, refining techniques, and other factors. To ensure reliable and reproducible results when determining the fuel resistance of materials, reference fluids of known composition, using worst case fuel compositions, are used. The current Jet Reference Fluid (JRF) called out in military sealant specifications was developed in the mid-1950s specifically as a JP-4 type test fluid formulation to be used for the accelerated laboratory testing of integral fuel tank sealants. In August 1978, chalking of the polysulfide sealant in integral fuel tanks of some new aircraft at Edwards Air Force Base in California was discovered after only 1 year of service. Although chalking of polysulfide sealants had been observed occasionally in the past, the rate of chalking was unprecedented. The results of an investigation showed that the rapid chalking of the polysulfide sealant was caused by a chemical reaction involving metal ions (copper, cadmium, lead, and iron) and mercaptan sulfur in the fuel. It was also noted that qualification testing of the sealant used had not predicted the chalking that occurred in service. Further investigation disclosed that the sealant had passed the chalking test in the military specification because the JRF used in the specifications chalking test did not contain trace metal ions as did the fuel removed from the tanks of the affected aircraft. The special Air Force investigating team included in its final report a recommendation that the JRF specification be reviewed and revised. The above chalking incident coupled with concerns resulting from deficiencies observed with the current JRF, and from changing sources of JP-4 indicated that an update of the JRF formulation in the sealant specifications was needed. A proposal was made to the SAE Aerospace Sealing Committee (G-9) which then formed a subcommittee for the development of a new Jet Reference Fluid (JRF) for evaluation of integral fuel tank sealants.
Rationale: Standard reference fluids, or test fluids, have long been used to evaluate the effects of hydrocarbon fuels on various materials, such as integral fuel tank sealants. Standard fluids are required because hydrocarbon fuels, such as JP-4, vary widely in composition depending on crude source, refining techniques, and other factors. To ensure reliable and reproducible results when determining the fuel resistance of materials, reference fluids of known composition, using worst case fuel compositions, are used. The current Jet Reference Fluid (JRF) called out in military sealant specifications was developed in the mid-1950s specifically as a JP-4 type test fluid formulation to be used for the accelerated laboratory testing of integral fuel tank sealants. In August 1978, chalking of the polysulfide sealant in integral fuel tanks of some new aircraft at Edwards Air Force Base in California was discovered after only 1 year of service. Although chalking of polysulfide sealants had been observed occasionally in the past, the rate of chalking was unprecedented. The results of an investigation showed that the rapid chalking of the polysulfide sealant was caused by a chemical reaction involving metal ions (copper, cadmium, lead, and iron) and mercaptan sulfur in the fuel. It was also noted that qualification testing of the sealant used had not predicted the chalking that occurred in service. Further investigation disclosed that the sealant had passed the chalking test in the military specification because the JRF used in the specifications chalking test did not contain trace metal ions as did the fuel removed from the tanks of the affected aircraft. The special Air Force investigating team included in its final report a recommendation that the JRF specification be reviewed and revised. The above chalking incident coupled with concerns resulting from deficiencies observed with the current JRF, and from changing sources of JP-4 indicated that an update of the JRF formulation in the sealant specifications was needed. A proposal was made to the SAE Aerospace Sealing Committee (G-9) which then formed a subcommittee for the development of a new Jet Reference Fluid (JRF) for evaluation of integral fuel tank sealants.Product Code:SAE J1214
Title:Tire to Body Clearance Check for Recreational Vehicles
Issuing Committee:Trailer Committee
Scope: The purpose of this SAE Recommended Practice is set guidelines for tire to wheel house and body clearances on recreational vehicles.
