【正文】 sh to eliminate the potential for vaporisation of the injected fluid and to avoid contamination of the fluid being pumped with the injected ， 以減少?zèng)_洗流體的汽化，同時(shí)可避免沖洗流體被污染。西部管道密封培訓(xùn) JohnCrane Tech(Tianjin) Co.,Ltd 培訓(xùn)內(nèi)容概述 ? 密封基礎(chǔ)知識(shí) ? 密封系統(tǒng)知識(shí) ? 密封的安裝要求 ? 密封的失效大致判斷 ? 與客戶技術(shù)人員進(jìn)行交流 機(jī)械密封基礎(chǔ) 第一部分 Concepts of Mechanical Seals 機(jī)械密封概念 Shaft Process Fluid 密封流體 Leakage 泄漏 Environment 環(huán)境 Vessel Wall 釜壁 The Basic Sealing Problem: Preventing Leakage 基本的密封問(wèn)題 : 防止泄漏 Shaft Process Fluid 流體流動(dòng) Leakage 泄漏 Environment 環(huán)境 Vessel Wall 釜壁 The Concept of an End Face Mechanical Seal 機(jī)械密封端面的概念 Shaft Movement 軸的運(yùn)動(dòng) Required Features必須的特征 ? Small axial clearance小的軸向間隙 ? Self adjusting自調(diào)節(jié) Mating Ring 配合環(huán) Primary Ring 補(bǔ)償環(huán) Secondary Sealing Element 輔助密封 A Flexible Seal Flexible 機(jī)械密封 ? Hydrostatic loading流體靜力學(xué)負(fù)荷 ? Secondary sealing elements輔助密封 ? Replaceable parts可替換的部件 ORing O型圈 Shaft軸 Mating Ring 配合環(huán) Primary Ring補(bǔ)償環(huán) Snap Ring卡環(huán) AntiX Ring 擋環(huán) ORing O型圈 Disk推環(huán) Springs彈簧 Retainer傳動(dòng)套 Set Screw定位螺絲 An Example of a Complete Seal Simply put, a mechanical seal is: 簡(jiǎn)單的說(shuō) ,機(jī)械密封就是 : 1. A wearable, stationary, primary sealing element 一個(gè)耐磨 ,靜止的密封件 2. A wearable, rotating, primary sealing element 一個(gè)耐磨 ,旋轉(zhuǎn)的密封件 3. A secondary sealing element 二次密封 4. A mechanical loading device to press primary sealing elements 1 and 2 against one another, and 使件 1和件 2相互貼合的機(jī)械裝置 5. Auxiliary ponents to plete seal 輔助密封 Nonflashing 沒(méi)有閃蒸 Flashing 閃蒸 Parallel 平行 Converging 收斂 Diverging 發(fā)散 Face Separation 密封面分離 Shape: 形態(tài) Gap: 間隙 Fluid: 流體 The Sealing Interface密封接觸面 Lubricant潤(rùn)滑劑 Separation分離面 Magnified Surface A 放大面 Magnified Surface B放大面 Heat熱量 The Sealing Interface密封面 ? Lubrication Purpose:潤(rùn)滑目的 ? Separate surfaces分離兩個(gè)面 ? Prevent contact of high surface points ? 防止出現(xiàn)面接觸 ? Reduce friction/heat generation減少摩擦 /生熱 Process Fluid Acts as Lubricant Between Faces流體在兩個(gè)面之間充當(dāng)潤(rùn)滑劑的過(guò)程 Gland密封端蓋 Pump Housing 泵腔 Process Fluid 工藝流體 Invisible Leakage: 不可見泄漏 Fluid Evaporates Upon Reaching Atmosphere 微量的泄漏在大氣側(cè)蒸發(fā) Primary Ring 補(bǔ)償環(huán) Mating Ring 配合環(huán) Gland密封端蓋 Pump Housing 泵腔 No Fluid Or Dry Running 沒(méi)有流體或者干運(yùn)轉(zhuǎn) Primary Ring 補(bǔ)償環(huán) Mating Ring 配合環(huán) Without Lubrication, Faces Run Dry And Overheat 沒(méi)有潤(rùn)滑干運(yùn)轉(zhuǎn)導(dǎo)致過(guò)熱 Mating Ring 配合環(huán) Primary Ring補(bǔ)償環(huán) Heat Generation 生熱 ? Rubbing摩擦 ? Viscous Shear粘性剪切力 Heat Transfer熱傳遞 ? Conduction傳導(dǎo) ? Convection對(duì)流 Injection注入 Flushing冷沖洗 ? Removes Heat帶走熱量 ? Replenishes Cool Clean Lubricating Liquid 補(bǔ)充潤(rùn)滑液 Primary Seal: Flush基本密封 :沖洗 Single Seal Flushing By Pass from Discharge (API Plan 11) 單密封通過(guò)出口進(jìn)行沖洗 By pass Line from Pump Discharge to Seal Gland 從泵出口到密封端蓋的管線 Discharge出口 Flow流動(dòng) Suction 入口 Primary Seal: Flush基本密封 :沖洗 Minimum Pressure .3 bar / 5 psi Above A? 最小壓力值要大于 A處 Flow 流動(dòng) Discharge出口 Suction 入口 Restrictional Device (Bushing) 限流裝置 Single Seal Flushing from External Source (API Plan 32) 單密封通過(guò)外部來(lái)源進(jìn)行沖洗 A Primary Seal: Quench 基本密封 :急冷 Restrictional Device (Packing) 限流裝置 (盤根 ) Quench Source急冷源 Process Fluid工藝流體 Single Seal Quench from External Source (API Plan 62) 單密封通過(guò)外部急冷 API Piping Plans API 沖洗方案 第二部分 JOHNCRANE API Piping Plans API 沖洗方案 Integral (internal) recirculation from pump discharge to seal 內(nèi)部循環(huán)從泵的出口到密封 Advantage 優(yōu)點(diǎn) No external piping 沒(méi)有外部沖洗 Limitations 局限性 Changing flow rate required dismantling of pump 改變流量需要拆泵 For clean pumpages only 只能是適用干凈的介質(zhì) API Piping Plans API 沖洗方案 Points to Note for API Plan 02: API 02 沖洗方案應(yīng)注意的事項(xiàng)： The injection tapping is used for venting prior to start–up. 在開車前，入口用來(lái)進(jìn)行放空 API plan 02 is often used together with plan 62, especially on high