DB44001-T 175-2022 取水计量系统计量特性在线测试方法

ICS

CCS

4401

取水计量系统计量特性在线测试方法Online

measurement

method

metrological

characteristics

forwater

drawing

metering

system 广州市市场监督管理局 发

布

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.................................................................................................................................................. I

本文件按照GB/T

第1部分：标准化文件的结构和起草规则》的规定II

460

计量系统的流计和配套施宜铭牌和标，其牌应不得遮盖或损，流量计应有

量系统的道不应有显变。流量计体连接部的焊接应整光，不得有焊、

±5.0%

2.5%

流速范围：≥0.3m/s

1.0

≤±0.1mm钢卷尺/π尺~π尺：测量范围：（0~≤±0.1mm≤±1≤±0.5s/d

1表1

表1

(0~50)）相对湿度：(35~95)%c(86~106)

kPa

检查计量系统的随机文件，其结果应符合4.1.1的要求。用目测的方法检查计量系统的外观，包括4.1.2

4.2

(m³/h)30003000~60006000(min)202530 iE= ´ …………(1)

iE= ´ …………(1)

3

i20q

qsi

3i

2规定的单次测量最短时间或累积流量达到计量系统最小分度值的1000ViVsi表2

表2

(1)iq

-qsiiqsiEi

iiq

i(m3iq

i(m3

n3456789d1.642.062.332.532.702.852.97Ei =i(2)Ei =i

VV

-

siVVsi

´%…………(2)Ei

iVii(m3)Vsii(m3)

(3)E =åE =åE

n

n

i

……………………(3)EnEn =i

-EiE

n测试次数，n≥3

(4)Edn

……………(4)EnEimaxEimindn(3)表3

选择与第一次安装方向相互垂直的另一方向重复测试，并按第

表3

若两次测试示值误差之差的绝对值≤1%，则取两者的平均值为计量系统的示值误差；若两次测试示值误差之差的绝对值＞1%，则重新按第

条进行测试。

5656

1年。≤DN3002.0±2.0%DN3001.0±1.0%

该计量准确度等级根据

GB

17167—2006

A.1

流量计为电磁流量计时应同时满足

GB/T

18659—2002GB/T

18660—2002

1033—2007

GB/T

35138—2017

1030—2007

GB/T

778—2018

162—2019

A.1

BB.1

B.1.1

在安装直管道区域内均匀选择不少于3个点