特殊氣體安全-免費閱讀
【正文】 80Regulators81Regulator Discharge CharacteristicsHigh Purity, Singlestage SS High Purity, Twostage Regulator Regulator 82Regulator TerminologyRefer to Participant Guide Appendix83Pressure IndicatorsThree types of devices that indicate pressure.1. Pressure Gauge 2. Pressure Indicator3. Pressure Transducer84 Pressure IndicatorsPressure Gauge壓力表壓力表? 儀表管內(nèi)顆粒聚集，吹掃困難? 1% 誤差? 本地直接讀數(shù)? 三通安裝形式? 壓力單位 100psi=7bar= 表壓力為相對壓力， 絕對壓力＝相對壓力 +大氣壓85 Pressure IndicatorsPressure Transmitter壓力傳送器l帶繼電器信號輸出的壓力表l無需電源86Pressure IndicatorsPressure Transducer壓力變送器壓力變送器% full scale accuracyuRequires electrical power source.uTee installation or inline install.uExcellent purgability.uPressure transducers are superior to gauges in accuracy, particle, and performance. 87Excess Flow Devicesl在氣體輸送系統(tǒng)中，判斷一個異常大的氣體流量lThe rating of the excess flow device installation is determined by the process flow requirements.lThere are two types of excess flow devices:1. Excess flow valve2. Excess flow switch88Excess Flow Devices89FiltersPurposes:l 去除氣流中的顆粒l 過濾器的重要性l 過濾效率90Gas Filter Selection Criteria 過濾器選型準則lFlow rate 氣體流量lGas Compatibility 與氣體的兼容性–Corrosives 腐蝕性–Reactants 反應(yīng)物lOutgassing performance 透氣性能91Gas Filter Selection Criteria 過濾器選型準則 lTemperature 氣體溫度lPressure 氣體壓力lParticle Retention Rating 顆粒截獲率92Filter Materialsl Evaluation of a filter should include all ponents of the filter.l The elastomeric or teflon filter is the most economical and mon filter. 特氟龍是最常用且經(jīng)濟的過濾材質(zhì)l Filter ponents * Housing 濾殼* Media 過濾芯* Media to housing seal 濾殼的密封* Support structure (elastomeric)濾芯的固定架93Filter MaterialslFilter media 過濾材質(zhì)* Elastomeric 塑料材質(zhì)* Ceramic 陶瓷* Metallic 金屬 CVD167。 The main header will branch off into various process areas.167。– Demand for the product can cause the vapor pressure to drop off and create a JT effect. 氣體的需求量會產(chǎn)生蒸發(fā)壓的降低并產(chǎn)生一焦耳能量54Joules Thompson (JT) Effect55Cylinders: 35+ Gases常用鋼瓶規(guī)格 : 40L大鋼瓶和 8L鋁瓶以 N2為例：一個 40L鋼瓶內(nèi)，可以容納 6標準立方米的 N256Cylinder Liquid Dewarl Function: The dewar cylinder is used for significant spot requirements where there is no bulk house gas supply. 杜瓦適用于無液槽罐供應(yīng)，但消耗量有較大的情況下。28氣體分類二 — 毒性氣體到底有多毒 ?CO一氧化碳的毒性容許濃度體積濃度 (ppmpart per million百萬分之一 )29氣體分類二 — 毒性氣體l有毒氣體危險防護– 提供排風系統(tǒng)– 正確操作氣瓶– 毒氣監(jiān)測系統(tǒng)– 適當?shù)膫€人裝備– 培訓30氣體分類二—腐蝕性氣體l 低腐蝕性– HF– BCl3– SiCl4l 高腐蝕性– HCl– BF3– DCSl 腐蝕性氣體之危險性摧毀人體生理組織腐蝕設(shè)備l 以下幾種氣體的危險性來自腐蝕性– HF, BCl3, SiCl431氣體分類二—腐蝕性氣體l被腐蝕的瓶口閥32氣體分類二 — 腐蝕性氣體l腐蝕性危險的防護– 提供排風系統(tǒng)– 正確操作氣瓶– 采用相容的原材料– 降低含水量– 適當?shù)膫€人防護設(shè)備33氣體分類二—腐蝕性氣體l操作腐蝕性氣體所應(yīng)配備的個人防護設(shè)備– 橡膠防護服– 橡膠手套– 面具– SCBA可選34氣瓶操作35氣瓶操作l單瓶運輸車36氣瓶操作l雙瓶運輸車37氣瓶操作l多瓶運輸車38氣瓶操作l不要通過旋轉(zhuǎn)來移動氣瓶39氣瓶操作l氣瓶操作原則– 不要機械撞擊氣瓶– 不要用氣瓶作
教學課件相關(guān)推薦
鄂ICP備17016276號-1