推荐回答(3个)
容积式流量器保养的步骤:
1、排尽气体:通常实液扫线后,管道内还残留较多空气,随着加压运行,空气以较高流速流过流量计,活动测量元件在较短时间内可能过速运转,引起损伤轴承。因此,开始时要缓慢增加流量,使空气逐渐外溢。
2、启动后通过最低位指针或字轮和秒表,确认未达过度流动,最佳流量应控制在70~80%最大流量,以保证仪表使用寿命。
3、检查过滤器:新管线启用最易破坏过滤网,试运行后要及时检查网是否完好。同时在过滤网清洁无物时最好记录下常用流量下的压力损失这两个参数,这样在今后工作中,不必卸下检查网堵塞情况,即可以压力损失增加程度来判断是否要清洗。
容积式流量计计量系统经试运行正常从而投人正常运行后,操作人员应从以下几方面做好使用和保养工作。
1)运行时经常注意被侧介质的流量、沮度、压力、粘度等 参数是否符合流量计的使用范围。如偏离较大,应查明原因,考虑补偿。
2)启动和关闭流量计的工作仍应按试运行时的顺序进行。一般应制订严格的操作程序及规范,包括流量计的使用规范,检验流量计的操作规程和检定周期,流量计故障处理程序动态扭矩传感器,备用流量计的启用规定及流量计和旁通阀的封印等。
3)定期对整个计量系统进行检查、维护和检验。内容包括流量计、阀门和管路系统,过滤器、消气器等配套设备,温度计、压力表和密度计等侧量仪表,安全阀、限流阀和报警器等保护设备,以及流量显示仪表、记录装置、补偿装置等流量辅助设备。
容积式流量计是生产中应用非常广泛的计量表,表体形式多样,但原理相同,都是计量表体内腔中介质的体积,计算时间内的转子频率即可计量出介质的流速。这种计量表最大弱点对介质的清洁度和前后压差要求很高,因为内腔与转子的间隙很小,轻微的杂质就可能卡住转子,造成仪表失灵,而前后压差过小则无法克服转子转动的惯性摩擦。所以日常运行要关注容积式流量计前方过滤器的洁净度,发现压差过大要进行清洗流量计应根据需要安装固定在任何角度,但使用场所不得有腐蚀性气体。必须安在特制的过滤器后面,以防杂质进入表内而损坏零部件,影响示值精度。
流量计安装前应去除防锈油,同时应仔细检查管路,清除杂质。流量计进出口的密封垫在安装时方可取下,以防杂质落入。流经流量计的流体流动方向应与外壳上箭头指示方向一致。流量计在投入运行前应将指针、计数器拨回零位,严禁工作时拨动。流量计严禁拆封、自行调整器差调整器。长期停用并拆下放入库房的流量计,需涂防锈油。储存流量计的库房应清洁干燥,没有腐蚀性物质,库房内温度为10-30℃,相对湿度不大于80%。按照要求正确安装后的椭圆齿轮流量计,使用时即可保证足够的精度,通常累计值的精度可达0.5级,是一种较为准确的流量计量仪表。但是,如果使用时被测介质的流量过小,仪表的泄漏误差的影响就会突出,不能再保证足够的测量精度。因此,不同型号规格的椭圆齿轮流量计对最小使用流量有一允许值,只有当实际被测流量大于该下限流量允许值时,测量精度才能得到保证。其次,使用椭圆齿轮流量计要注意被测介质的温度不能过高,否则不仅会增加测量误差,而且有使齿轮发生卡死的可能。为此,椭圆齿轮流量计在仪表所规定的使用温度范围内使用。长期使用后的椭圆齿轮流量计,其内部的齿轮会被腐蚀和磨损,从而影响测量精度。因此,要经常注意观察,并定期拆下进行检查,若条件允许最好定期进行标定。
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