①. 均速管流量計(ji)(ji)（例如(ru)阿牛巴、威力巴等(deng)）、畢(bi)(bi)托(tuo)管流量計(ji)(ji)及其變形產品如(ru)V形畢(bi)(bi)托(tuo)管流量計(ji)(ji)和畢(bi)(bi)托(tuo)式文丘里管，宜安裝(zhuang)在(zai)(zai)水平(ping)管道(dao)(dao)上，當測量氣(qi)體或蒸汽(qi)時，也可安裝(zhuang)在(zai)(zai)垂直管道(dao)(dao)上。

 ②. 均速管流量(liang)計不(bu)可用(yong)于測(ce)量(liang)兩相流及工(gong)作溫度(du)低于飽和溫度(du)的(de)蒸汽流量(liang)的(de)測(ce)量(liang)。

 ③. 均速管(guan)流量計應安裝在被(bei)測介(jie)質完全充滿的(de)管(guan)道上。

 ④. 均速(su)管(guan)(guan)(guan)流量(liang)(liang)計(ji)在(zai)(zai)工(gong)藝管(guan)(guan)(guan)道(dao)(dao)(dao)上(shang)(shang)截面(mian)上(shang)(shang)的(de)插入方位應(ying)滿足下列要求：在(zai)(zai)水(shui)(shui)(shui)平(ping)管(guan)(guan)(guan)道(dao)(dao)(dao)上(shang)(shang)安(an)(an)裝(zhuang)、測量(liang)(liang)氣體時(shi)，應(ying)在(zai)(zai)水(shui)(shui)(shui)平(ping)線(xian)(xian)(xian)以上(shang)(shang)且(qie)(qie)與(yu)(yu)水(shui)(shui)(shui)平(ping)線(xian)(xian)(xian)夾角30°～150°的(de)范圍(wei)內；在(zai)(zai)水(shui)(shui)(shui)平(ping)管(guan)(guan)(guan)道(dao)(dao)(dao)上(shang)(shang)安(an)(an)裝(zhuang)、測量(liang)(liang)液體和蒸汽(qi)時(shi)，應(ying)在(zai)(zai)水(shui)(shui)(shui)平(ping)線(xian)(xian)(xian)以下且(qie)(qie)與(yu)(yu)水(shui)(shui)(shui)平(ping)線(xian)(xian)(xian)夾角-50°～-130°的(de)范圍(wei)內；在(zai)(zai)垂直管(guan)(guan)(guan)道(dao)(dao)(dao)上(shang)(shang)安(an)(an)裝(zhuang)時(shi)，可在(zai)(zai)與(yu)(yu)管(guan)(guan)(guan)道(dao)(dao)(dao)中(zhong)(zhong)心(xin)線(xian)(xian)(xian)垂直的(de)平(ping)面(mian)內的(de)任意位置；均速(su)管(guan)(guan)(guan)流量(liang)(liang)計(ji)測壓孔開孔中(zhong)(zhong)心(xin)線(xian)(xian)(xian)與(yu)(yu)管(guan)(guan)(guan)道(dao)(dao)(dao)中(zhong)(zhong)心(xin)線(xian)(xian)(xian)的(de)偏(pian)差(cha)(cha)應(ying)小(xiao)于3°，均速(su)管(guan)(guan)(guan)流量(liang)(liang)計(ji)中(zhong)(zhong)心(xin)線(xian)(xian)(xian)與(yu)(yu)管(guan)(guan)(guan)線(xian)(xian)(xian)垂直度偏(pian)差(cha)(cha)應(ying)小(xiao)于5°，與(yu)(yu)管(guan)(guan)(guan)道(dao)(dao)(dao)中(zhong)(zhong)心(xin)線(xian)(xian)(xian)的(de)偏(pian)差(cha)(cha)應(ying)小(xiao)于3°。

 ⑤. 測(ce)(ce)量精度(du)要求(qiu)為(wei)(wei)±1％時(shi)，均速管流量計(ji)上、下游(you)側(ce)直(zhi)管段(duan)長(chang)度(du)應符(fu)合表2.46的要求(qiu)。測(ce)(ce)量精度(du)要求(qiu)為(wei)(wei)士3％時(shi)，至少(shao)應有(you)上游(you)側(ce)3DN、下游(you)側(ce)2DN的直(zhi)管段(duan)長(chang)度(du)。