德國burkert寶德孔板流量計％burkert辦事處

德國burkert寶德孔板流量計

1、優(yōu)點(diǎn)

(1)標(biāo)準(zhǔn)節(jié)流件是全世界通用的，并得到了國際標(biāo)準(zhǔn)組織的認(rèn)可，無需實流校準(zhǔn)，即可投用，在流量計中亦是的。

(2)結(jié)構(gòu)易于復(fù)制，簡單、牢固、性能穩(wěn)定可靠、價格低廉;

(3)應(yīng)用范圍廣，包括全部單相流體(液、氣、蒸汽)、部分混相流，一般生產(chǎn)過程的管徑、工作狀態(tài)(溫度、壓力)皆有產(chǎn)品。

(4)檢測件和差壓顯示儀表可分開不同廠家生產(chǎn)，便與化規(guī)模生產(chǎn);

2、缺點(diǎn)

(1)測量的重復(fù)性、度在流量計中屬于中等水平，由于眾多因素的影響錯綜復(fù)雜，度難于提高。

(2)范圍度窄，由于流量系數(shù)與雷諾數(shù)有關(guān)一般范圍度僅3∶1 ～ 4∶1。

(3)有較長的直管段長度要求，一般難于滿足。尤其對較大管徑，問題更加突出;

(4)壓力損失大;

德國burkert寶德孔板流量計通常為維持一臺孔板流量計正常運(yùn)行，水泵需要附加動力克服孔板的壓力損失。該附加耗電量可直接由壓力損失和流量計算確定。一年約需多耗電數(shù)萬度，折合人民幣數(shù)萬元。下表中列出了孔板在正常壓力損失情況下的能耗計算結(jié)果。其中運(yùn)行天數(shù)按三百五十天計算，電價按0.35元/度計算。由表中計算電耗數(shù)據(jù)可見，孔板的附加運(yùn)行費(fèi)用是極高的，而采用彎管流量計該運(yùn)行費(fèi)用為零!

(5)孔板以內(nèi)孔銳角線來保證精度，因此對腐蝕、磨損、結(jié)垢、臟污敏感，長期使用精度難以保證，需每年拆下強(qiáng)檢一次。

(6)采用法蘭連接，易產(chǎn)生跑、冒、滴、漏問題，大大增加了維護(hù)工作量。

德國burkert寶德孔板流量計％burkert辦事處

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德國burkert寶德孔板流量計％burkert辦事處

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