ripple compensator in front of flowmeter, if the condition of construction can not satisfy requirement of concentric degree.
5. When the gas pressure fluctuations larger, to ensure measurement accuracy, flow regulator should be installed at the upstream.
6. When flowmeter is installed, the valves in front and back of the meter and bypass line should be set up in case that gas need not be stopped in maintenance. Fig.4, Fig.5 and Fig.6 are A, B and C flowmeter installation pipeline typical system chart (the direction of inlet and outlet is Top in Below out; Below in Top out; Left in Right out), for reference. (Note: Type A is usually used to make the installation of meters)
7. Pipeline with installation flowmeter must be proper, in order not to make flowmeter body to bear abnormal external forces..
8. Before flowmeter runs, lubricants should be injected (GB486-65 rapid oil H3-5) from the oil mouth to center line mark, and according to operation condition, lubricating oil can be added or changed regularly. Front and back valves must be closed and after empting the gas the lubricating oil can be added. 9. Before operation, all valves should be turned on or off slowly, to prevent the flowmeter from being damaged in sudden jumping.
10. After some time operation, if filter pressure reduces, filters should be cleaned or replaced; if pressure increases and sensitiveness goes up , clean petrol or kerosene can be used to clean the measure room.
11. If the flowmeter is out of use for long time, lubricating oil should be cleaned out, and measure room should be cleaned with petrol, and the inlet and outlet should be sealed then parked in dry place.
12. Connection size flowmeter installation seen in Table 2 and Fig.7, flange size accords with standard \
图4 流量计（上进下出）安装管路平面图 安装示意图
Fig.4 Installation of flowmeter
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(Top in Below out)
5 流量计（下进上出）安装管路平面图 (Below in Top out)
★推荐使用的安装方式★★推荐使用的安装方式★
安装示意图
图
Fig.5 Installation of flowmeter
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图6 流量计（左进右出）安装管路平面图 安装示意图
Fig.6 Installation of flowmeter
(Left in Right out)
★一般不推荐使用的安装方式★
注：所附安装示意图仅供参考，实际安装方式将根据现场情况决定。
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故障判断与修理
故 障 现 象 表芯内各齿轮不转或传动不灵活 原 因 分 析 更换表芯 更换表芯 解 决 办 法 1、表芯各传动齿轮，蜗轮、蜗杆磨损 2、传动轴轴承磨损，孔径变大或变形 1、各计数轮内齿磨损或脱落 计数器不工作 2、计数器轴支架损坏 供气正常，转子正常工1、磁钢套与转子轴脱落或者磁钢套和转作，表芯齿轮不转，计子轴之间的固定螺钉松动 数器不工作 2、磁钢从磁钢套上脱落 1、过滤器、过滤网罩堵塞 2、计量室进入异物（如焊渣、砂粒、锈不过气，表头不计数 蚀物等），出现卡表 3、安装不当，致使表体承受过大外力而变形 1、润滑不好 流量计工作时噪音过大 2、轴承出现磨损或轴承钢球碎裂造成转子与计量室和墙板之间出现摩擦 密封部位出现渗漏现象 “O”型圈老化失效 1、重新固定磁钢套 2、重新固定磁钢 1、清洗或更换滤芯和网罩 2、打开流量计，取出异物，修复转子表面 3、调整安装管道，保证轴线一致。 1、更换补充润滑油 2、更换轴承 更换“O”型圈
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FAILURE JUDGEMENT AND REPAIR
Failures Analysis Solution Replace the core of meter. 1. Transmission gear, worm and worm wheel are Gears in the core do not turn worn. or transmission is not 2. The bearing is worn and the aperture flexible extends or is deformed. 1. Counter gear is worn or broken off. Counter does not work 2、Counter support for axle is damaged. Gas feeding is normal, rotor 1. Alnico cover falls off form rotor axle or works normally but table screw between the rotor axle and alnico cover core gear does not turn , and is loosed. counter does not work 2. Alnico drops from the cover of alnico. 1. Filter or the cover of filter is blocked up. The gas can not be passed 2. Rust dregs, welding slag and other through and the meter does impurities drop into the measuring room, and not count the rotor is jammed. 3. Improper installation causes exceptional force on the body. 1. deficient lubrication 2. Bearing is worn or bearing steel ball is Noise is exceptional when broken , which cause friction between rotor the flowmeter works and measuring room and between rotor and wallboard Seepage in sealed area The “O”shaped ring becomes invalid Replace the core of meter. 1. Fixup alnico covers again. 2. Fixup alnico again. 1. Wash or replace the filter and guard. 2. Disassemble the flowmeter, take out the impurities, and repair the surface of rotor. 3. Adjust pipeline, keep pipe’s balance. 1. Replace or supply lubricating oil. 2. Replace bearing. Replace the“O”shaped ring
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