①. 均速管(guan)流(liu)(liu)量(liang)計（例如阿牛巴、威力巴等）、畢托(tuo)管(guan)流(liu)(liu)量(liang)計及其(qi)變形產品如V形畢托(tuo)管(guan)流(liu)(liu)量(liang)計和畢托(tuo)式文丘里管(guan)，宜(yi)安裝(zhuang)在水平管(guan)道(dao)上，當測量(liang)氣(qi)體或(huo)蒸(zheng)汽時，也可安裝(zhuang)在垂直管(guan)道(dao)上。

 ②. 均速管流(liu)量計不(bu)可用于(yu)測(ce)量兩相流(liu)及工(gong)作溫度低于(yu)飽和(he)溫度的蒸汽(qi)流(liu)量的測(ce)量。

 ③. 均速管流量計應安裝在被測介質完(wan)全充滿的管道上。

 ④. 均(jun)速管(guan)(guan)(guan)流(liu)(liu)量(liang)計在工藝管(guan)(guan)(guan)道(dao)上(shang)截面(mian)(mian)上(shang)的插入(ru)方位應(ying)滿足下列要求：在水(shui)(shui)平(ping)管(guan)(guan)(guan)道(dao)上(shang)安(an)裝(zhuang)、測(ce)量(liang)氣體(ti)時，應(ying)在水(shui)(shui)平(ping)線(xian)(xian)以上(shang)且與(yu)(yu)水(shui)(shui)平(ping)線(xian)(xian)夾角(jiao)30°～150°的范(fan)圍(wei)內；在水(shui)(shui)平(ping)管(guan)(guan)(guan)道(dao)上(shang)安(an)裝(zhuang)、測(ce)量(liang)液體(ti)和蒸(zheng)汽時，應(ying)在水(shui)(shui)平(ping)線(xian)(xian)以下且與(yu)(yu)水(shui)(shui)平(ping)線(xian)(xian)夾角(jiao)-50°～-130°的范(fan)圍(wei)內；在垂(chui)直管(guan)(guan)(guan)道(dao)上(shang)安(an)裝(zhuang)時，可在與(yu)(yu)管(guan)(guan)(guan)道(dao)中(zhong)心(xin)(xin)線(xian)(xian)垂(chui)直的平(ping)面(mian)(mian)內的任(ren)意位置；均(jun)速管(guan)(guan)(guan)流(liu)(liu)量(liang)計測(ce)壓孔開孔中(zhong)心(xin)(xin)線(xian)(xian)與(yu)(yu)管(guan)(guan)(guan)道(dao)中(zhong)心(xin)(xin)線(xian)(xian)的偏差應(ying)小(xiao)于3°，均(jun)速管(guan)(guan)(guan)流(liu)(liu)量(liang)計中(zhong)心(xin)(xin)線(xian)(xian)與(yu)(yu)管(guan)(guan)(guan)線(xian)(xian)垂(chui)直度偏差應(ying)小(xiao)于5°，與(yu)(yu)管(guan)(guan)(guan)道(dao)中(zhong)心(xin)(xin)線(xian)(xian)的偏差應(ying)小(xiao)于3°。

 ⑤. 測量精度(du)要(yao)求為(wei)(wei)±1％時(shi)，均速(su)管(guan)流量計上、下游側(ce)直(zhi)管(guan)段長度(du)應符(fu)合表2.46的要(yao)求。測量精度(du)要(yao)求為(wei)(wei)士3％時(shi)，至少應有上游側(ce)3DN、下游側(ce)2DN的直(zhi)管(guan)段長度(du)。