①. 均速管流(liu)量(liang)計(ji)（例如阿牛(niu)巴、威力巴等）、畢(bi)托管流(liu)量(liang)計(ji)及(ji)其(qi)變(bian)形產品如V形畢(bi)托管流(liu)量(liang)計(ji)和(he)畢(bi)托式文丘里(li)管，宜安(an)裝在水平(ping)管道上(shang)，當測量(liang)氣體或蒸汽(qi)時，也可安(an)裝在垂直管道上(shang)。

 ②. 均速(su)管流(liu)量計不可用于測(ce)量兩相流(liu)及工作溫(wen)度低于飽和溫(wen)度的蒸汽流(liu)量的測(ce)量。

 ③. 均(jun)速管流量(liang)計應安(an)裝在被測介質完全充(chong)滿的(de)管道上。

 ④. 均速管(guan)(guan)流量計在(zai)(zai)工藝管(guan)(guan)道(dao)(dao)上(shang)截面(mian)上(shang)的(de)插入方位應(ying)滿足下列要求：在(zai)(zai)水(shui)平(ping)管(guan)(guan)道(dao)(dao)上(shang)安(an)裝、測(ce)(ce)量氣體時(shi)，應(ying)在(zai)(zai)水(shui)平(ping)線(xian)(xian)(xian)以上(shang)且與(yu)水(shui)平(ping)線(xian)(xian)(xian)夾角(jiao)30°～150°的(de)范(fan)圍內(nei)；在(zai)(zai)水(shui)平(ping)管(guan)(guan)道(dao)(dao)上(shang)安(an)裝、測(ce)(ce)量液體和蒸汽(qi)時(shi)，應(ying)在(zai)(zai)水(shui)平(ping)線(xian)(xian)(xian)以下且與(yu)水(shui)平(ping)線(xian)(xian)(xian)夾角(jiao)-50°～-130°的(de)范(fan)圍內(nei)；在(zai)(zai)垂(chui)直管(guan)(guan)道(dao)(dao)上(shang)安(an)裝時(shi)，可(ke)在(zai)(zai)與(yu)管(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)垂(chui)直的(de)平(ping)面(mian)內(nei)的(de)任意位置；均速管(guan)(guan)流量計測(ce)(ce)壓(ya)孔開孔中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)的(de)偏(pian)差應(ying)小(xiao)于3°，均速管(guan)(guan)流量計中(zhong)心線(xian)(xian)(xian)與(yu)管(guan)(guan)線(xian)(xian)(xian)垂(chui)直度偏(pian)差應(ying)小(xiao)于5°，與(yu)管(guan)(guan)道(dao)(dao)中(zhong)心線(xian)(xian)(xian)的(de)偏(pian)差應(ying)小(xiao)于3°。

 ⑤. 測量精度(du)要(yao)求(qiu)為(wei)±1％時(shi)，均速管流量計上、下游側(ce)直(zhi)管段長度(du)應符合表(biao)2.46的(de)要(yao)求(qiu)。測量精度(du)要(yao)求(qiu)為(wei)士(shi)3％時(shi)，至少應有上游側(ce)3DN、下游側(ce)2DN的(de)直(zhi)管段長度(du)。