①. 均速管流(liu)量(liang)(liang)計(ji)（例如阿牛巴、威力巴等）、畢托(tuo)管流(liu)量(liang)(liang)計(ji)及其變(bian)形產(chan)品如V形畢托(tuo)管流(liu)量(liang)(liang)計(ji)和畢托(tuo)式文丘里管，宜安(an)裝在水平管道上，當測量(liang)(liang)氣體或蒸汽(qi)時，也可安(an)裝在垂(chui)直管道上。

 ②. 均速管(guan)流(liu)量計不可用(yong)于測量兩相流(liu)及工作溫(wen)度(du)低于飽和(he)溫(wen)度(du)的蒸汽流(liu)量的測量。

 ③. 均(jun)速(su)管流(liu)量計應安裝在被測介質完全充滿的管道(dao)上。

 ④. 均速(su)(su)管(guan)(guan)(guan)流量(liang)計在(zai)(zai)工藝管(guan)(guan)(guan)道上(shang)截面(mian)上(shang)的(de)插(cha)入方位應(ying)(ying)(ying)滿足下列要求：在(zai)(zai)水(shui)平(ping)管(guan)(guan)(guan)道上(shang)安裝、測(ce)量(liang)氣(qi)體時(shi)，應(ying)(ying)(ying)在(zai)(zai)水(shui)平(ping)線(xian)(xian)(xian)以(yi)上(shang)且與(yu)水(shui)平(ping)線(xian)(xian)(xian)夾角30°～150°的(de)范(fan)圍(wei)(wei)內(nei)(nei)；在(zai)(zai)水(shui)平(ping)管(guan)(guan)(guan)道上(shang)安裝、測(ce)量(liang)液體和蒸(zheng)汽時(shi)，應(ying)(ying)(ying)在(zai)(zai)水(shui)平(ping)線(xian)(xian)(xian)以(yi)下且與(yu)水(shui)平(ping)線(xian)(xian)(xian)夾角-50°～-130°的(de)范(fan)圍(wei)(wei)內(nei)(nei)；在(zai)(zai)垂(chui)直(zhi)管(guan)(guan)(guan)道上(shang)安裝時(shi)，可在(zai)(zai)與(yu)管(guan)(guan)(guan)道中(zhong)心線(xian)(xian)(xian)垂(chui)直(zhi)的(de)平(ping)面(mian)內(nei)(nei)的(de)任意位置(zhi)；均速(su)(su)管(guan)(guan)(guan)流量(liang)計測(ce)壓(ya)孔開(kai)孔中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)(guan)道中(zhong)心線(xian)(xian)(xian)的(de)偏差(cha)應(ying)(ying)(ying)小(xiao)(xiao)于(yu)3°，均速(su)(su)管(guan)(guan)(guan)流量(liang)計中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)(guan)線(xian)(xian)(xian)垂(chui)直(zhi)度(du)偏差(cha)應(ying)(ying)(ying)小(xiao)(xiao)于(yu)5°，與(yu)管(guan)(guan)(guan)道中(zhong)心線(xian)(xian)(xian)的(de)偏差(cha)應(ying)(ying)(ying)小(xiao)(xiao)于(yu)3°。

 ⑤. 測量(liang)精度(du)要(yao)求(qiu)為±1％時，均速管流(liu)量(liang)計上(shang)、下游側(ce)直(zhi)管段(duan)長度(du)應(ying)符(fu)合表2.46的要(yao)求(qiu)。測量(liang)精度(du)要(yao)求(qiu)為士3％時，至少應(ying)有上(shang)游側(ce)3DN、下游側(ce)2DN的直(zhi)管段(duan)長度(du)。