①. 均(jun)速管(guan)(guan)(guan)流量計（例(li)如阿牛巴、威力巴等）、畢托管(guan)(guan)(guan)流量計及其變形產品如V形畢托管(guan)(guan)(guan)流量計和畢托式(shi)文丘里管(guan)(guan)(guan)，宜安(an)裝(zhuang)在水平(ping)管(guan)(guan)(guan)道(dao)上(shang)(shang)，當測量氣體或(huo)蒸汽時，也可(ke)安(an)裝(zhuang)在垂直管(guan)(guan)(guan)道(dao)上(shang)(shang)。

 ②. 均速(su)管流(liu)(liu)量(liang)(liang)計(ji)不可用于(yu)測(ce)量(liang)(liang)兩相流(liu)(liu)及工作溫度低于(yu)飽(bao)和溫度的蒸汽流(liu)(liu)量(liang)(liang)的測(ce)量(liang)(liang)。

 ③. 均速(su)管流量計應安裝在被測介質完全充(chong)滿的管道上。

 ④. 均速管(guan)流量計(ji)(ji)在(zai)(zai)工藝管(guan)道(dao)(dao)(dao)上(shang)(shang)(shang)截(jie)面上(shang)(shang)(shang)的插入(ru)方位(wei)(wei)應(ying)(ying)滿足下列要求：在(zai)(zai)水(shui)(shui)(shui)平(ping)(ping)管(guan)道(dao)(dao)(dao)上(shang)(shang)(shang)安(an)裝(zhuang)、測量氣(qi)體(ti)時(shi)，應(ying)(ying)在(zai)(zai)水(shui)(shui)(shui)平(ping)(ping)線(xian)(xian)以上(shang)(shang)(shang)且與(yu)水(shui)(shui)(shui)平(ping)(ping)線(xian)(xian)夾角(jiao)30°～150°的范圍內(nei)(nei)；在(zai)(zai)水(shui)(shui)(shui)平(ping)(ping)管(guan)道(dao)(dao)(dao)上(shang)(shang)(shang)安(an)裝(zhuang)、測量液體(ti)和蒸(zheng)汽(qi)時(shi)，應(ying)(ying)在(zai)(zai)水(shui)(shui)(shui)平(ping)(ping)線(xian)(xian)以下且與(yu)水(shui)(shui)(shui)平(ping)(ping)線(xian)(xian)夾角(jiao)-50°～-130°的范圍內(nei)(nei)；在(zai)(zai)垂(chui)(chui)直(zhi)管(guan)道(dao)(dao)(dao)上(shang)(shang)(shang)安(an)裝(zhuang)時(shi)，可在(zai)(zai)與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心(xin)(xin)線(xian)(xian)垂(chui)(chui)直(zhi)的平(ping)(ping)面內(nei)(nei)的任意位(wei)(wei)置(zhi)；均速管(guan)流量計(ji)(ji)測壓(ya)孔(kong)開孔(kong)中(zhong)心(xin)(xin)線(xian)(xian)與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心(xin)(xin)線(xian)(xian)的偏(pian)差應(ying)(ying)小(xiao)(xiao)于3°，均速管(guan)流量計(ji)(ji)中(zhong)心(xin)(xin)線(xian)(xian)與(yu)管(guan)線(xian)(xian)垂(chui)(chui)直(zhi)度(du)偏(pian)差應(ying)(ying)小(xiao)(xiao)于5°，與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心(xin)(xin)線(xian)(xian)的偏(pian)差應(ying)(ying)小(xiao)(xiao)于3°。

 ⑤. 測(ce)量精度(du)要(yao)求為(wei)±1％時，均(jun)速(su)管(guan)流量計(ji)上、下游(you)側(ce)(ce)直(zhi)管(guan)段長度(du)應符合表2.46的(de)要(yao)求。測(ce)量精度(du)要(yao)求為(wei)士3％時，至少(shao)應有上游(you)側(ce)(ce)3DN、下游(you)側(ce)(ce)2DN的(de)直(zhi)管(guan)段長度(du)。