①. 均速(su)管流量(liang)(liang)計（例如阿牛巴、威力巴等）、畢托(tuo)管流量(liang)(liang)計及其變形(xing)產品如V形(xing)畢托(tuo)管流量(liang)(liang)計和畢托(tuo)式文(wen)丘里管，宜安(an)裝(zhuang)在水平管道上，當測量(liang)(liang)氣體或(huo)蒸汽時(shi)，也(ye)可安(an)裝(zhuang)在垂直管道上。

 ②. 均速(su)管流量(liang)計不可用于測量(liang)兩相流及工(gong)作(zuo)溫度(du)低于飽和溫度(du)的蒸汽流量(liang)的測量(liang)。

 ③. 均速管(guan)流量計應安裝在被測介質完(wan)全充滿的(de)管(guan)道(dao)上(shang)。

 ④. 均速(su)管(guan)流量(liang)計(ji)在工(gong)藝管(guan)道(dao)(dao)(dao)上(shang)截面(mian)上(shang)的(de)(de)插入方位應滿足(zu)下(xia)列(lie)要(yao)求：在水(shui)平(ping)管(guan)道(dao)(dao)(dao)上(shang)安(an)裝(zhuang)、測量(liang)氣體時，應在水(shui)平(ping)線(xian)(xian)(xian)(xian)以上(shang)且與(yu)水(shui)平(ping)線(xian)(xian)(xian)(xian)夾角(jiao)30°～150°的(de)(de)范(fan)(fan)圍內；在水(shui)平(ping)管(guan)道(dao)(dao)(dao)上(shang)安(an)裝(zhuang)、測量(liang)液體和蒸汽時，應在水(shui)平(ping)線(xian)(xian)(xian)(xian)以下(xia)且與(yu)水(shui)平(ping)線(xian)(xian)(xian)(xian)夾角(jiao)-50°～-130°的(de)(de)范(fan)(fan)圍內；在垂直(zhi)管(guan)道(dao)(dao)(dao)上(shang)安(an)裝(zhuang)時，可在與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心線(xian)(xian)(xian)(xian)垂直(zhi)的(de)(de)平(ping)面(mian)內的(de)(de)任意(yi)位置；均速(su)管(guan)流量(liang)計(ji)測壓(ya)孔開孔中(zhong)心線(xian)(xian)(xian)(xian)與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心線(xian)(xian)(xian)(xian)的(de)(de)偏(pian)差(cha)應小于3°，均速(su)管(guan)流量(liang)計(ji)中(zhong)心線(xian)(xian)(xian)(xian)與(yu)管(guan)線(xian)(xian)(xian)(xian)垂直(zhi)度偏(pian)差(cha)應小于5°，與(yu)管(guan)道(dao)(dao)(dao)中(zhong)心線(xian)(xian)(xian)(xian)的(de)(de)偏(pian)差(cha)應小于3°。

 ⑤. 測(ce)量(liang)精(jing)度要求為(wei)±1％時，均速管(guan)流(liu)量(liang)計上、下(xia)游(you)側(ce)(ce)直管(guan)段長度應符(fu)合表2.46的(de)要求。測(ce)量(liang)精(jing)度要求為(wei)士3％時，至少應有(you)上游(you)側(ce)(ce)3DN、下(xia)游(you)側(ce)(ce)2DN的(de)直管(guan)段長度。