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青珂
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给排水工程师
离心泵泵轴材质? 离心泵 泵轴材质一般是45#,或者304的吧? 泵轴直接与介质接触吗?一些腐蚀性较强的介质是否会腐蚀到泵轴? 查看更多 7个回答 . 1人已关注
谁有施工招标用的工程概况模板啊?(土建+安装)急!? 项目施工招标,需要一个工程概况描述(分土建和安装)作为投标单位的报价基准,哪位大侠有模板麻烦发我一个,谢谢! 查看更多 2个回答 . 4人已关注
锅炉缺水造成的钢管变形爆破的形成过程及其特征是什么? 锅炉缺水造成的钢管变形爆破的形成过程及其特征是什么?查看更多 0个回答 . 1人已关注
预加氢循环氢硫化氢含量高的原因? 感谢亲们,原料硫2000超标一倍。处理量达120%过,循环氢现在一 直置换不下来了,汽提没问题。换热没问题。现 ... 原料硫高得有些离谱,设计也不会这么高的。什么原料这么高硫,它不适合做重整原料的,如果要做应该先经过汽 柴油 加氢精制一下。 你自己算一下脱硫率,太高了,远超预加氢 催化剂 能力了。 查看更多 6个回答 . 3人已关注
造纸污水处理最前沿? 广州宝泉环保科技有限公司发明了一种 絮凝剂 ,能够使造纸污水在几十秒钟之内澄清并达到排放标准。沉淀的污泥( 短纤维 )和水都100%回用。该技术已经申请了专利,在广州这边推广。该技术通过回收纸浆和节省用水,可以为厂家带来巨大的利润。相信这将在造纸污水处理业引起一场浩大的革命。希望大家给予关注与支持。谢谢! 公司的网址是: http://www.gzbqhb.com 查看更多 10个回答 . 3人已关注
生活中的安全知识:老年代步车真能安全代步吗?  “我爸60多岁的人了天天开着他那个老年代步车在道路上跑,我看着都害怕!”有这样顾虑的不止市民黄雁鸣一个。如今老年人出行方式多种多样,其中不乏代步车、三轮车这样安全系数极低的代步工具。加之,部分老年人淡薄的交通意识和较差的身体机能,更使这一群体成为出行意外的高发人群。不止儿女,许多驾驶员也在关注,老年人选择代步车出行究竟是否可行?我们又该如何保障老人的出行安全?   老人偏爱代步车出行 儿女忧心   市民黄雁鸣说,家中66岁的父亲黄成钢自从去年买了一辆老年代步车后,就彻底告别了公交、地铁等公共交通工具,无论买菜还是走亲戚,全靠代步车。   黄成钢购买的是一辆四轮代步车,外表看起来倒与品牌的小型车有些相似,但内部构造却完全不同,除了驾驶位上能坐一个人外,就只有后座能坐一个人,并且没有档位。“我坐过一次我爸的车,心惊胆战的,这个车的铁皮只有薄薄一层,驾驶座上的视野也不好。”黄雁鸣说,那次出行父亲还将代步车开进了钟楼盘道。由于车身小,代步车在机动车流中左右插队,不时响起的鸣笛声,让自己一阵阵地揪心。回来后,他曾劝父亲不要再驾驶这辆车,但老人家认为代步车便于驾驶又好停放,只要不骑太快就不会出事,相反乘坐公交车等交通工具还需要步行,车上也较挤,更容易发生事故。   同样的情况发生在市民彭小瑜家中,工作日时彭小瑜都将上小学的女儿放在父母家照看,让父母帮忙接送女儿。今年9月,刚开学没多久,彭小瑜就发现父亲买了一辆电动三轮车,后面还贴了一张纸“接送家人 不营运”。原来父亲为了接送外孙方便专门买了这辆车,平时就让孙女坐在后座。“到女儿学校要经过一条大马路,我爸就骑个电动三轮车直接穿行,速度还特别快!”彭小瑜说,父亲的心脏也不好,骑电动车上路不但要担心女儿的安全,还时刻担心父亲被路上的鸣笛干扰。   代步车监管存在空白 安全难保   据从滴滴发布的“老人出行习惯调查报告”中了解到,50岁到70岁的老人普遍反映出行难,他们出行方式单一,频繁换乘和大量步行让老人们的身体难以消受,所以依靠自行车和机动车出行的老人高达20.59%。由于多数老人没有驾照,为了方便,不少老人就将目光投向了代步车、三轮车,但这究竟是不是最适合老人的出行方式?   “现在不但老人家驾驶代步车、三轮车的多,乘坐的也很多。”交警莲湖大队安监中队副中队长童启航告说,许多腿脚不便的老年人去较远的地方不舍得打出租车,又无法乘坐公交车,就会选择非法营运的三轮车。据介绍,严格来讲,老年代步车不能上路,不能载人。因为许多老年代步三轮车的时速早已达到了《机动车运行安全技术条件》中规定的时速20公里以上50公里以下。虽然不少老人仍认为自己的代步三轮车属于非机动车、电动车,但其实达到这一标准即算作机动车。要按照机动车算,驾驶老年代步车的老人大多没有机动车驾驶证,车辆也没有行驶证照,所以根本就不能在道路上行驶。   “老年代步车其实就是从残疾人助力车演化而来的。”童启航说,这类车辆其实是医疗器械,最高时速不能超过10公里/小时,对道路的安全性要求极高,在机动车道上左右穿行,其实是非常危险的。   考虑驾驶方便操作简单,加之不用登记上牌考驾照,虽然老人们对代步车非常青睐,但其实这类车辆连保险都无法购买,没有任何安全保障。童启航说,也正是因为这种特殊性,监管才难以落实。随后,记者从伞塔路一家电动车经营商户证实,市面上的多数老年代步车都不在《车辆生产企业及产品公告》内,没有获得国家相关部门的生产许可。老人选购主要是“图个方便”,还不用上牌。   优先选择公交出行 制定规范   老人选择什么样的出行方式更安全?陕西锦颐和养老总经理杨涛说,随着年龄增长,老年人身体各项生理机能都在退化,出行最好优先考虑公交、地铁等公共交通工具,“即使有个啥事,也能及时得到车上其他乘客的帮助”。   “老年人自己驾驶车辆并不可取,因为老年人反应较慢,很难应对道路上的突发状况。”杨涛说,加之代步车、三轮车等车辆的生产厂家大多不正规,如未达到安全标准,对老人来说则又少了一重安全保障。如果老人执意要骑,杨涛建议最好有亲属陪同,或由亲属驾车带老人出行。   为确保安全,童启航提醒驾驶代步车出行的老人,请依法依规行驶,严格将速度控制在10公里/小时以下的低时速;不要进入机动车道、车流量大的街道。同时,提早预防避免与机动车、其他非机动车及行人抢道。   “比禁止代步车更重要的是完善相关法律法规。”长安区沁春园养老院的王先生指出最好能将代步车、助力车这类车辆作为特殊管理车型,尽早统一此类车辆的生产标准,用标准化提升其安全性。结合日常工作中发现的问题,交警部门也可以与正规生产厂家合作,在确保车辆安全的基础上,通过对代步车操作方法的培训,尽可能提高老人的交通安全意识。查看更多 3个回答 . 5人已关注
管道应力分析,为啥大家不试试 AUTOPIPE ? 提供的资料里面包含软件查看更多 12个回答 . 2人已关注
AutopipeMX V9计算疑问? 本人win7 32位,安装了AutopipeMX V9中文版,每次位移计算 都会死机,不知道是什么原因,大家碰到过这样的情况吗?是不是 换成英文版会好点? 经 测试 ,英文版也是这样,一到位移计算就死机了。哎 我Autopipe版本是v9.0.08查看更多 4个回答 . 3人已关注
油罐进油装置的自动联锁切断? 石油库设计规范上说,频繁操作的油罐,宜设自动联锁切断进油装置。 现本人有两个问题:1、联锁条件都有哪些?2、是只为油罐的进油装置设置自动联锁切断吗?是出于什么原因?谢谢您的参与,请您不吝赐教! 查看更多 2个回答 . 2人已关注
双温导热油炉? 请问有没有大震双温 导热油炉 【型号yyqw-2400yq]的设备构造与参数??????谢谢查看更多 1个回答 . 4人已关注
请教各位关于DCS上位机是否需要安装杀毒软件的问题? 我碰到有些用户要求DCS上位机安装杀毒软件,但是安装杀毒软件会导致上位机的监控画面相应速度、数据刷新速度变慢,而且有些网络数据包会被杀毒软件拦截,各位高人有没有遇到过这种情况,或者有什么高见既能在上位机安装杀毒软件又不影响系统稳定运行和操作。查看更多 11个回答 . 3人已关注
新能源订阅杂志? 各位好,我现在不做新能源行业,但是想对这个行业增加一些了解,所以想订阅一份新能源行业杂志,能不能给我推荐一份啊,谢谢!!! 查看更多 1个回答 . 5人已关注
塔类设备的常见缺陷有哪些? 塔类设备的常见缺陷有哪些查看更多 1个回答 . 1人已关注
煤炭直接液化的基本原理? 煤炭 直接液化是指:在一定条件下的加氢反应过程,生成物除油类液体以外,还有液体水和气体。其基本原理是煤炭大分子通过加热分解,煤的结构单元之间的桥键断裂。桥键的断裂产生的结构单元作为自由基,在高压 氢气 环境和有机溶剂分子分隔的条件下,被加氢生成稳定的低分子产物,从而实现此过程。查看更多 24个回答 . 3人已关注
尿素合成装置的模拟讨论? 大家现在一般用哪个软件进行 尿素 合成装置的工艺模拟,如何确保计算的准确度,谢谢!查看更多 0个回答 . 3人已关注
1_1_1_ ,2-四氟乙烷英文介绍? Material Safety Data Sheet Jincool &reg; HFC-134a Part 1. Chemical Product and Company Identification Product Name: Jincool&reg; HFC-134a Other/Generic Names: HFC-134a,R134a Production Use: Refrigerant, Foam blowing agent, Aerosol Hazard Class: 2.2, Non-flammable gas Chemical attribute: Halohydrocarbon Manufacturer: Sinochem Environmental Protection Chemicals (Taicang) Co., Ltd Add.: No.18, Binjiang Road, Shihua Park, Taicang, Jiangsu, PR of China Call for more information: +86-512-53713100 Call in case of emergency: +86-512-53713126 F F—C—C—H F F H Part 2. Composition / Information on Ingredients Ingredient Name: 1,1,1,2-Tetrafluoroethane Molecular formula: C2H2F4 Structural formula: Relative molecular mass: 102.00 CAS No.: 811-97-2 Purity: Standard≥99.5% Excellent ≥99.9% Appearance: Clear, colorless liquid and vapor, no turbidity or foul smell Part 3. Hazards Identification Potential Health Hazards Skin: Irritation would result from a defatting action on tissue. Liquid contact could cause frostbite. Eyes: Liquid contact can cause severe irritation and frostbite. Mist may irritate. Inhalation: Jincool&reg; 134a is low in acute toxicity in animals. When oxygen levels in air are reduced to 12-14% by displacement, symptoms of asphyxiation, loss of coordination, increased pulse rate and deeper respiration will occur. At high levels, cardiac arrhythmia may occur. Ingestion: Ingestion is unlikely because of the low boiling point of the material. Should it occur, discomfort in the gastrointestinal tract from rapid evaporation of the material and consequent evolution of gas would result. Some effects of inhalation and skin exposure would be expected. Delayed Effects: None known Part 4. First Aid Measures Skin: Promptly flush skin with water until all chemical is removed. If there is evidence of frostbite, bathe (do not rub) with lukewarm (not hot) water. If water is not available, cover with a clean, soft cloth or similar covering. Get medical attention if symptoms persist. Eyes: Immediately flush eyes with large amounts of water for at least 15 minutes (in case of frostbite water should be lukewarm, not hot) lifting eyelids occasionally to facilitate irrigation. Get medical attention if symptoms persist. Inhalation: Immediately remove to fresh air. If breathing has stopped, give artificial respiration. Use oxygen as required, provided a qualified operator is available. Get medical attention. Do not give epinephrine (adrenaline). Ingestion: Ingestion is unlikely because of the physical properties and is not expected to be hazardous. Do not induce vomiting unless instructed to do so by a physician. Advice to Physician: Because of the possible disturbances of cardiac rhythm, catecholamine drugs, such as epinephrine, should be used with special caution and only in situations of emergency life support. Treatment of overexposure should be directed at the control of symptoms and the clinical conditions. Part 5. Fire Fighting Measures Flammable Properties Flash Point: Gas, not applicable Flash Point Method: Not applicable Autoignition Temperature: >750°C Upper Flame Limit (volume% in air): None* Lower Flame Limit (volume% in air): None* Flame Propagation Rate (solids): Not applicable Extinguishing Media: Use any standard agent – choose the one most appropriate for type of surrounding fire (material itself is not flammable) Unusual Fire and Explosion Hazards: Jincool&reg; 134a is not flammable at ambient temperatures and atmospheric pressure. However, this material will become combustible when mixed with air under pressure and exposed to strong ignition sources. Contact with certain reactive metals may result in formation of explosive or exothermic reactions under specific conditions (e.g. very high temperatures and/or appropriate pressures). Special Fire Fighting Precautions/Instructions: Firefighters should wear self-contained breathing apparatus for protection against possible toxic decomposition products. Proper eye and skin protection should be provided. Use water spray to keep fire-exposed containers cool. Part 6. Accidental Release Measures In Case of Spill or other Release: Always wear recommended personal protective equipment. Evacuate unprotected personnel. Protected personnel should remove ignition sources and shut off leak, if without risk, and provide ventilation. Unprotected personnel should not return until air has been tested and determined safe, including lowlying areas. Spills and releases may have to be reported to local authorities. Part 7. Handling and Storage Normal Handling: Always wear recommended personal protective equipment. Avoid breathing vapors and liquid contact with eyes, skin or clothing. Do not puncture or drop cylinders, expose them to open flame or excessive heat. Use authorized cylinders only. Follow standard safety precautions for handling and use of compressed gas cylinders. Jincool&reg; 134a should not be mixed with air above atmospheric pressure for leak testing or any other purpose. Storage Recommendations: Store in a cool, well-ventilated area of low fire risk and out of direct sunlight. Protect cylinder and its fittings from physical damage. Storage in subsurface locations should be avoided. Close valve tightly after use and when empty. Part 8. Exposure Controls / Personal Protection Engineering Controls: Provide local ventilation at filling zones and areas where leakage is probable. Mechanical (general) ventilation may be adequate for other operating and storage areas. Personal Protective Equipment Skin Protection: Skin contact with refrigerant may cause frostbite. General work clothing and gloves (leather) should provide adequate protection. If prolonged contact with the liquid or gas is anticipated, insulated gloves constructed of PVA, neoprene or butyl rubber should be used. Any contaminated clothing should be promptly removed and washed before reuse. Eye Protection: For normal conditions, wear safety glasses. Where there is reasonable probability of liquid contact, wear chemical safety goggles. Respiratory Protection: None generally required for adequately ventilated work situations. For accidental release or non-ventilated situations, or release into confined space, where the concentration may be above the PEL of 1,000 ppm, use a self-contained breathing apparatus or supplied air respirator. For escape: use the former or a gas mask with organic vapor canister. Additional Recommentations: Where contact with liquid is likely, such as in a spill or leak, impervious boots and clothing should be worn. High doselevel warning signs are recommended for areas of principle exposure. Provide eyewash stations and quick-drench shower facilities at convenient locations. For tank cleaning operations, see OSHA regulations, 29 CFR 1910.132 and 29 CFR 1910.133 Exposure Guidelines: INGREDIENT NAME ACGIH TLV OSHA PEL OTHER LIMIT 1,1,1,2-Tetrafluoroethane None None *1000 ppm TWA (8hr) * = Workplace Environmental Exposure Level (AIHA). Part 9. Physical and chemical properties PHYSICAL STATE: Gas at ambient temperatures MOLECULAR WEIGHT: 102 CHEMICAL FORMULA: F3CCH2F ODOR: Faint ethereal odor SPECIFIC GRAVITY (water = 1.0): 1.206 SOLUBILITY IN WATER (wt %): 0.15 wt%S pH: Neutral BOILING POINT: -26.2°C (-15.1°F) FREEZING POINT: -92.5°C (-141.9°F) VAPOR PRESSURE: 666.1 Kpa @ 25°C VAPOR DENSITY (air = 1.0): 5.25 FLASH POINT: Not applicable CRITICAL TEMPERATURE: 101.1°C CRITICAL PRESSURE: 4.06 Mpa OCTANOL WATER PARTITION COEFFICIENT: Log Pow = 1.06 Part 10. Stability and Reactivity Normally Stability: The product is stable. Do not mix with oxygen or air above atmospheric pressure. Any source of high temperature, such as lighted cigarettes, flames, hot spots or welding may yield toxic and/or corrosive decomposition products. Incompatibilities: (Under specific conditions: e.g. very high temperatures and/or appropriate pressures) – Freshly abraded aluminum surfaces (may cause strong exothermic reaction). Chemically active metals: potassium, calcium, powdered aluminum, magnesium and zinc. Hazardous Decomposition Products: Halogens, halogen acids and possibly carbonyl halides. Hazardous Polymerization: Will not occur. Part 11. Toxicological Information Immediate (Acute) Effects: LC50 : 4 hr. (rat) - > 500,000 ppm Cardiac Sensitization threshold (dog) 80,000 ppm. Delayed (Subchronic and Chronic) Effects: Not mutagenic in four tests Teratogenic NOEL (rat and rabbit) - 40,000 ppm Subchronic inhalation (rat) NOEL - 50,000 ppm Chronic NOEL - 10,000 ppm OTHER DATA: Metabolism <0.5% as CO2 in tests at 50,000 ppm, late developing benign tumors were found. Part 12. Ecological Information This product can destroy the ozone layer but not substantially. It can also pollute the ground surface water, soil, atmosphere and drinking water. Degradability (BOD): Jincool&reg; 134a is a gas at room temperature; therefore, it is unlikely to remain in water. Part 13. Disposal Considerations Refer to the pertinent state and local laws and regulations before disposal. Part 14. Transportation US DOT PROPER SHIPPING NAME: 1,1,1,2-Tetrafluoroethane US DOT HAZARD CLASS: 2.2 US DOT PACKING GROUP: Not applicable US DOT ID NUMBER: UN3159 For additional information on shipping regulations affecting this material, contact the information number found in Part 1. Part 15. Regulation Information LAWS AND REGULATIONS IN CHINA NAME: Regulations on the Control over Safety of Dangerous Chemicals Regulations on Safe Use of Chemicals at Workplace PRESCIBE: production, storage, transportation, loading and unloading TOXIC SUBSTANCES CONTROL ACT (TSCA) TSCA INVENTORY STATUS: Listed on the TSCA inventory OTHER TSCA ISSUES: None Part 16. Miscellaneous CURRENT ISSUE DATE: February, 2008 PREVIOUS ISSUE DATE: January, 2006 The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. Sinochem shall not be held liable for any damage resulting from handling or from contact with the above product. END 查看更多 1个回答 . 4人已关注
钢制球形储罐? GB12337-2014钢制球形储罐(带书签)PDF查看更多 2个回答 . 3人已关注
MTL 温度变送器 组态? 求组关于组态的问题。 请问,利用软件 PCS83 如何 组态MTL838B, 我按照说明书,连接各个线,在进入组态的时候,总是提示RS232 Time out. RX TX COM线 接的都是对的, 与MTL831 接了一组 Highway通道, MTL831上短接了一组 热电偶 端子, 按要求 MTL838上 短接了 5 6端 (好像是这个 )。 求大神 为什么我总是连接不上, 电脑也按要求用了 IBM的笔记本, 查看更多 5个回答 . 1人已关注
安装余热锅炉,废热锅炉要向当地报检吗? 一切按锅炉安装的要求走,这样以后你就不会很被动。查看更多 1个回答 . 5人已关注
橡胶促进剂污水预处理? 请教橡胶 促进剂 污水做预处理,除了芬顿以外还有什么药剂能处理啊?查看更多 4个回答 . 1人已关注
简介
职业:中安信科技有限公司 - 给排水工程师
学校:青岛科技大学 - 化学与分子工程学院
地区:福建省
个人简介:想告别这无聊的日子,又讨厌无用的自己。查看更多
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