CJ/T 23-1999 城市园林苗圃育苗技术规程
作者:标准资料网 时间:2024-05-16 05:19:28 浏览:9342
来源:标准资料网
基本信息
| 标准名称： | 城市园林苗圃育苗技术规程 |
| 中标分类： |
农业、林业 >>
林业 >>
种子、苗水、苗圃 |
| 替代情况： | 原标准号CJ 14-1986 |
| 发布部门： | 中华人民共和国建设部 |
| 发布日期： | 1999-06-04 |
| 实施日期： | 1999-06-04 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 提出单位： | 城市建设管理局 |
| 起草单位： | 北京市园林局等 |
| 起草人： | 鲁东和、杜若聪、王荫堂、姚振坍、刘再春、王维兴、张选信、孙锦、索奎霖 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2004-03-23 |
| 页数： | 10页 |
| 书号： | 155066.2-13600 |
适用范围
为了加强城市园林苗圃技术管理，提高育苗技术水平，满足城市园林绿化对苗木的基本需要，特制订本规程。本规程主要对城市园林绿化需要的乔木、灌木和部分花木的繁育技术作出有关规定。其他专业苗圃可参照使用。花卉、草皮、地被植物、水生植物和盆栽花木等园林植物的育苗规程另行制订。
前言
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所属分类： 农业 林业 林业 种子 苗水 苗圃
Product Code:SAE J171
Title:Measurement of Fuel Evaporative Emissions from Gasoline Powered Passenger Carsand Light Trucks Using the Enclosure Technique (Cancelled Dec 2000)
Issuing Committee:Sae Ic Powertrain Steering Committee
Scope:This SAE Recommended Practice describes a procedure for measuring evaporative emissions from fuel systems of passenger cars and light trucks. Emissions are measured during a sequence of laboratory tests that simulate typical vehicle usage in a metropolitan area during summer months:a. A 1 h soak representing one diurnal cycle in which temperature of fuel in the vehicle's tank is raised from 15.6 to 28.9 掳C (60 to 84 掳F)b. A 17.9 km (11.1 mile) drive on a chassis dynamometerc. A 1 h hot soak immediately following the 17.9 km (11.1 mile) driveThe method described in this document, commonly known as the SHED (Sealed Housing for Evaporative Determination) technique, employs an enclosure in which the vehicle is placed during the diurnal and hot soak phases of the test. Vapors that escape from all openings in the fuel system--both expected and unexpected--are retained in the enclosure, and the increase in hydrocarbon (HC) concentration of the atmosphere in the enclosure represents the evaporative emissions. Emission values measured by the enclosure method can, therefore, be significantly different than those obtained by the former trap method, depending on fuel system configuration and component design.The test sequence and methods for measuring emissions are applicable to vehicles either with or without systems or devices to control fuel evaporative emissions. Although they have been used successfully with a wide range of vehicles equipped with a variety of control devices, they should not be applied indiscriminately to new or unique vehicles or fuel systems. For example, based on experience that temperature excursions of the fuel tank in parked vehicles follow those of ambient air, the test sequence prescribes heating of the fuel tank to simulate a diurnal soak. Any control system designed to alter the relation between fuel and ambient temperatures will not be properly evaluated in the test sequences prescribed.This document is intended as a guide toward standard
