濱海機械密封包括壓力控制、溫度控制、流體替換(堵塞)和雜質去除系統。在濱海機械密封系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)中，上述(shu)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)并(bing)不同時包(bao)括(kuo)在(zai)內。密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的選擇(ze)主(zhu)要取決于(yu)(yu)主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)件的應用(yong)(yong)(yong)范(fan)圍(wei)。例如，如果主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)用(yong)(yong)(yong)于(yu)(yu)高(gao)溫液體(ti)(ti)，密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)(que)保降低主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)的環境溫度，即采用(yong)(yong)(yong)溫度控制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。如果主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)用(yong)(yong)(yong)于(yu)(yu)固體(ti)(ti)雜(za)質(zhi)(zhi)含(han)量高(gao)的工作介(jie)質(zhi)(zhi)，密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)(que)保在(zai)主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)前降低固體(ti)(ti)雜(za)質(zhi)(zhi)含(han)量，即采用(yong)(yong)(yong)除(chu)雜(za)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)腐(fu)蝕性介(jie)質(zhi)(zhi)中，密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)必須確(que)(que)保主(zhu)密(mi)(mi)(mi)封(feng)(feng)(feng)降低腐(fu)蝕速率或消除(chu)腐(fu)蝕，即使用(yong)(yong)(yong)流體(ti)(ti)而不是(shi)堵塞(sai)流體(ti)(ti)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)高(gao)壓密(mi)(mi)(mi)封(feng)(feng)(feng)裝(zhuang)置中，輔助系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應確(que)(que)保多級降壓和其他措施，即壓力控制系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。

　　濱海機械密封的三個主要(yao)功能(neng)如下：

　　1、沖洗功能，沖洗是濱海機械密封基本的功能，它直接將液體注入單面密封或雙面密封的高壓側。一般的濱海機械密封應(ying)該(gai)沖(chong)洗(xi)，特別是對于輕(qing)烴泵，沖(chong)洗(xi)時達到隔(ge)(ge)離(li)介質、冷(leng)卻和改善潤滑的目(mu)的。隔(ge)(ge)離(li)介質的目(mu)的可以通過將與(yu)介質相容的液體引入密封腔進(jin)行外部(bu)循環沖(chong)洗(xi)來實(shi)現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對濱海機械密封造(zao)成的危害非常嚴重，可能導致密封(feng)端面的磨損，也(ye)可能堵塞寒(han)冷密封(feng)系統的管線。密封(feng)性系統軟件(jian)具(ju)有(you)去除(chu)(chu)殘(can)渣(zha)(zha)、保持(chi)液體(ti)清潔的作用。當殘(can)渣(zha)(zha)的相(xiang)(xiang)對(dui)密度小于液體(ti)媒質相(xiang)(xiang)對(dui)密度時(shi)，能用過(guo)(guo)濾裝置去除(chu)(chu)殘(can)渣(zha)(zha)；而當殘(can)渣(zha)(zha)的相(xiang)(xiang)對(dui)密度超過(guo)(guo)液體(ti)媒質相(xiang)(xiang)對(dui)密度時(shi)，可選用旋液分離設(she)備(bei)或網(wang)式(shi)過(guo)(guo)濾器去除(chu)(chu)殘(can)渣(zha)(zha)。

　　3、流體替代功能，含有固體顆粒的氣相介質和液相介質的直接密封難度很大，它們溫、毒、貴、易蒸發、易結晶。借助濱海機械密封可以用雙端濱海機械密封代替密(mi)封(feng)介(jie)質(zhi)，將難以直接密(mi)封(feng)的(de)介(jie)質(zhi)轉化為密(mi)封(feng)潤滑性(xing)能好、清潔(jie)的(de)密(mi)封(feng)液體介(jie)質(zhi)。