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    压力仪表选型的一般原则

    2017-05-02 09:38:50  来源:多钦仪表
    仪表在工业生产过程中,起着对工艺参数进行检测、显示、记录或控制的重要作用。 工艺生产过程的检测是了解和控制工业生产的基本手段,只有在任何时刻都能准确地了解工艺过程的全貌,并进行控制,才能保证生产过程顺利,并以高的生产率、小的消耗生产出合格的产品。所以,别看仪表不起眼,却是*不可缺少的!本文为大家介绍中压力仪表的选型,内容非常全面!


    《多钦仪表(上海)有限公司》分享检测仪表(元件)及控制阀选型的一般原则如下:


    1.工艺过程的条件

    工艺过程的、压力、流量、粘度、性、毒性、脉动等因素是决定选型的主要条件,它关系到仪表选用的合理性、仪表的使用寿命及车间的防火、防爆、保安等问题。

    2.操作上的重要性

    GEJIANCEDIANDECANSHUZAICAOZUOSHANGDEZHONGYAOXINGSHIYIBIAODEZHISHI、JILU、、BAOJING、KONGZHI、YAOKONGDENGGONGNENGXUANDINGYIJU。YIBANLAISHUO,DUIGONGYIGUOCHENGYINGXIANGBUDA,DANXUJINGCHANGJIANSHIDEBIANLIANG,KEXUANZHISHIXING;DUIXUYAOJINGCHANGLEJIEBIANHUAQUSHIDEZHONGYAOBIANLIANG,YINGXUANJILUSHI;ERYIXIEDUIGONGYIGUOCHENGYINGXIANGJIAODADE,YOUXUSUISHIJIANKONGDEBIANLIANG,YINGSHEKONGZHI;DUIGUANXIDAOWULIAOHENGSUANHEDONGLIXIAOHAOERYAOQIUJILIANGHUOJINGJIHESUANDEBIANLIANG,YISHEJISUAN;YIXIEKENENGYINGXIANGSHENGCHANHUOANQUANDEBIANLIANG,YISHEBAOJING。

    3.经济性和统一性

    YIBIAODEXUANXINGYEJUEDINGYUTOUZIDEGUIMO,YINGZAIMANZUGONGYIHEZIKONGDEYAOQIUQIANTIXIA,JINXINGBIYAODEJINGJIHESUAN,QUDESHIYIDEXINGNENG/JIAGEBI。

    WEIBIANYUYIBIAODEWEIXIUHEGUANLI,ZAIXUANXINGSHIYEYAOZHUYIDAOYIBIAODETONGYIXING。JINLIANGXUANYONGTONGYIXILIE、TONGYIGUIGEXINGHAOJITONGYISHENGCHANCHANGJIADECHANPIN。

    4.仪表的使用和供应情况

    XUANYONGDEYIBIAOYINGSHIJIAOWEICHENGSHUDECHANPIN,JINGXIANCHANGSHIYONGZHENGMINGXINGNENGKEKAODE;TONGSHIYAOZHUYIDAOXUANYONGDEYIBIAOYINGDANGSHIHUOYUANGONGYINGCHONGPEI,BUHUIYINGXIANGGONGCHENGDESHIGONGJINDU。



    压力表的选择

    1按照使用环境和测量介质的性质选择

    (1)ZAIDAQIFUSHIXINGJIAOQIANG、FENCHENJIAODUOHEYIPENLINYETIDENGHUANJINGELIEDECHANGHE,YIXUANYONGMIBISHIQUANSUYALIBIAO。

    (2)稀硝酸、醋酸、氨类及其它一般腐蚀性介质,应选用耐酸压力表、氨压力表或不锈钢膜片压力表。

    (3)稀盐酸、盐酸气、重油类及其类似的具有强腐蚀性、含固体颗粒、粘稠液等介质,应选用膜片压力表或隔膜压力表。其膜片或隔膜的材质,必须根据测量介质的特性选择。

    (4)JIEJING、JIEBAJIGAOZHANDUDENGJIEZHI,YINGXUANYONGMOPIANYALIBIAO。

    (5)ZAIZHENDONGJIAOQIANGDECHANGHE,YINGXUANYONGNAIZHENYALIBIAOHUOCHUANYONGYALIBIAO。

    (6)ZAIYIRAN、YIBAODECHANGHE,RUXUDIANJIEDIANXUNHAOSHI,YINGXUANYONGFANGBAODIANJIEDIANYALIBIAO。

    (7)XIALIECELIANGJIEZHIYINGXUANYONGZHUANYONGYALIBIAO:

    • QIAN、YEAN:ANYALIBIAO、ZHENKONGBIAO、YALIZHENKONGBIAO;

    • YANGQI:YANGQIYALIBIAO;

    • QINGQI:QINGQIYALIBIAO;

    • LVQI:NAILVYALIBIAO、YALIZHENKONGBIAO;

    • YIGUI:YIGUIYALIBIAO;

    • LIUHUAQING:NAILIUYALIBIAO;

    • JIANYE:NAIJIANYALIBIAO、YALIZHENKONGBIAO。

    2精确度等级的选择

    (1)YIBANCELIANGYONGDEYALIBIAO、MOHEYALIBIAOHEMOPIANYALIBIAO,YINGXUANYONG1.5JIHUO2.5JI。

    (2)JINGMICELIANGHEXIAOYANYONGYALIBIAO,YINGXUANYONG0.4JI、0.25JIHUO0.16JI。

    3外型尺寸的选择

    (1)ZAIGUANDAOHESHEBEISHANGANZHUANGDEYALIBIAO,GONGCHENGZHIJINGWEIφ100mmHUOφ150mm。

    (2)ZAIYIBIAOQIDONGGUANLUJIQIFUZHUSHEBEISHANGANZHUANGDEYALIBIAO,GONGCHENGZHIJINGWEIφ60mm。

    (3)ANZHUANGZAIZHAODUJIAODI、WEIZHIJIAOGAOYIJISHIZHIBUYIGUANCECHANGHEDEYALIBIAO,GONGCHENGZHIJINGWEIφ200mmHUOφ250mm。

    4测量范围的选择

    (1)CELIANGWENDINGDEYALISHI,ZHENGCHANGCAOZUOYALIZHIYINGZAIYIBIAOCELIANGFANWEISHANGXIANZHIDE2/3~1/3。

    (2)CELIANGMAIDONGYALI(RU:BENG、YASUOJIHEFENGJIDENGCHUKOUCHUYALI)SHI,ZHENGCHANGCAOZUOYALIZHIYINGZAIYIBIAOCELIANGFANWEISHANGXIANZHIDE1/2~1/3。

    (3)CELIANGGAO、ZHONGYALI(DAYU4MPa)SHI,ZHENGCHANGCAOZUOYALIZHIBUYINGCHAOGUOYIBIAOCELIANGFANWEISHANGXIANZHIDE1/2。

    5单位及标度(刻度)

    (1)YALIYIBIAOYILVSHIYONGFADINGJILIANGDANWEI。JI:PA(Pa)、QIANPA(kPa)HEZHAOPA(MPa)。

    (2)DUIYUSHEWAISHEJIXIANGMUHEYINJINYIBIAO,KEYICAIYONGGUOJITONGYONGBIAOZHUNHUOXIANGYINGDEGUOJIABIAOZHUN。

    <二>变送器、传感器的选择

    (1)YIBIAOZHUNXINHAO(4~20mA)CHUANSHUSHI,YINGXUANYONGBIANSONGQI。

    (2)YIRAN、YIBAOCHANGHE,YINGXUANYONGQIDONGBIANSONGQIHUOFANGBAOXINGDIANDONGBIANSONGQI。

    (3)JIEJING、JIEBA、DUSAI、ZHANCHOUJIFUSHIXINGJIEZHI,YINGXUANYONGFALANSHIBIANSONGQI。YUJIEZHIZHIJIEJIECHUDECAIZHI,BIXUGENJUJIEZHIDETEXINGXUANZE。

    (4)SHIYONGHUANJINGJIAOHAO、CELIANGJINGQUEDUHEKEKAOXINGYAOQIUBUGAODECHANGHE,KEYIXUANYONGDIANZUSHI、DIANGANSHIYUANCHUANYALIBIAOHUOHUOERYALIBIANSONGQI。

    (5)CELIANGWEIXIAOYALI(XIAOYU500Pa)SHI,KEXUANYONGWEICHAYABIANSONGQI。

    <三>安装附件的选择

    (1)测量水蒸汽和温度大于60℃的介质时,应选用螺旋型或U型弯管。

    (2)CELIANGYIYEHUADEQITISHI,RUOQUYADIANGAOYUYIBIAO,YINGXUANYONGFENLIQI。

    (3)CELIANGHANFENCHENDEQITISHI,YINGXUANYONGCHUCHENQI。

    (4)CELIANGMAIDONGYALISHI,YINGXUANYONGZUNIQIHUOHUANCHONGQI。

    (5)ZAISHIYONGHUANJINGWENDUJIEJINHUODIYUCELIANGJIEZHIDEBINGDIANHUONINGGUDIANSHI,YINGCAIQUJUEREHUOBANRECUOSHI。

    (6)XIALIECHANGHEYINGXUANYONGYIBIAOBAOHU(WEN)XIANG。

    • LUTIANANZHUANGDEYALIKAIGUANHEBIANSONGQI。

    • ZAIYOUYANZHONGDAQIFUSHI、DUOFENCHENHEQITAYOUHAIWUZHIDECHANGFANGNEIANZHUANGDEYALIKAIGUANHEBIANSONGQI。