①. 均速管(guan)流(liu)(liu)量(liang)計(ji)(ji)（例如阿牛(niu)巴、威力巴等）、畢托管(guan)流(liu)(liu)量(liang)計(ji)(ji)及其變形產品如V形畢托管(guan)流(liu)(liu)量(liang)計(ji)(ji)和畢托式文丘里管(guan)，宜安(an)裝(zhuang)在水平(ping)管(guan)道(dao)上，當測量(liang)氣(qi)體或蒸汽時(shi)，也(ye)可安(an)裝(zhuang)在垂直管(guan)道(dao)上。

 ②. 均(jun)速管流量(liang)計不可用于測(ce)(ce)量(liang)兩相流及工作溫(wen)度(du)低于飽和溫(wen)度(du)的蒸汽流量(liang)的測(ce)(ce)量(liang)。

 ③. 均速(su)管流量計應安裝(zhuang)在被(bei)測介質完全(quan)充滿的管道上(shang)。

 ④. 均速管(guan)(guan)(guan)流(liu)量(liang)計在(zai)(zai)(zai)工(gong)藝管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)截面上(shang)(shang)的(de)插入方(fang)位應滿足下列要求：在(zai)(zai)(zai)水(shui)平管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)安裝、測量(liang)氣體時，應在(zai)(zai)(zai)水(shui)平線(xian)(xian)(xian)以上(shang)(shang)且與(yu)水(shui)平線(xian)(xian)(xian)夾(jia)角30°～150°的(de)范圍(wei)內；在(zai)(zai)(zai)水(shui)平管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)安裝、測量(liang)液體和蒸汽時，應在(zai)(zai)(zai)水(shui)平線(xian)(xian)(xian)以下且與(yu)水(shui)平線(xian)(xian)(xian)夾(jia)角-50°～-130°的(de)范圍(wei)內；在(zai)(zai)(zai)垂直(zhi)管(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)安裝時，可在(zai)(zai)(zai)與(yu)管(guan)(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)垂直(zhi)的(de)平面內的(de)任(ren)意(yi)位置(zhi)；均速管(guan)(guan)(guan)流(liu)量(liang)計測壓孔(kong)開孔(kong)中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)的(de)偏(pian)差應小于(yu)3°，均速管(guan)(guan)(guan)流(liu)量(liang)計中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)(guan)線(xian)(xian)(xian)垂直(zhi)度(du)偏(pian)差應小于(yu)5°，與(yu)管(guan)(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)的(de)偏(pian)差應小于(yu)3°。

 ⑤. 測量精度要(yao)(yao)求為±1％時，均速管(guan)流量計上、下游(you)(you)側(ce)直管(guan)段(duan)長度應符合表2.46的要(yao)(yao)求。測量精度要(yao)(yao)求為士3％時，至少(shao)應有上游(you)(you)側(ce)3DN、下游(you)(you)側(ce)2DN的直管(guan)段(duan)長度。