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1)  protection tube
保护管
1.
Three types of ceramet protection tubes for thermocouples weredeveloped by way of powder metallurgy .
采用粉未冶金工艺,研制出三种金属陶瓷热电偶保护管:MCPT-4型(Mo-Al_2O_3-Cr_2O_3-TiO_2)在高温盐浴炉中使用寿命超过 1 400 h,MCPT-6 型(Mo-Cr-Al_2O_3-Cr_2O_3-TiO_2-MgO)在铜液中使用寿命不低于 1 000 h,MCPT-3型(Mo-MgO-Cr_2O_3)多孔管,在LD转炉中可连续使用 121炉。
2)  protecting tube
保护管
1.
In recent years,the cable protecting tube has witnessed rapid development and its materials are of a great variety and different properties.
近年来,电缆保护管行业发展迅速,管材种类繁多,性能各异。
3)  protective pipe
保护管
1.
The diameter of FRP cable protective pipes varies from 50 to 200 mm and the thickness of the pipe wall is from 2 to 12 mm.
玻璃钢电缆保护管直径d为(50~200)mm,管子壁厚t为(2~12)mm,变化范围很大。
4)  casing protection
套管保护
1.
Aiming at the serious casing corrosion of water injection wells,one chemical agent is injected into the annular space of the tubing and casing,and forms a ring-shape elastical seal plug,then the suitable corrosion control agent and bactericidal agent are injected,used as a casing protection fluid.
针对注水井环空油套管腐蚀严重的问题,在油管套管环空的某一指定位置使用化学剂形成一个环状粘弹性密封塞,注入适合本油田的防腐剂和杀菌剂作为套管保护液,对油套环空起到良好的保护作用。
5)  conservation and management
保护管理
1.
Advancing in depth on the Collective Forest Property Right system,will positively improve on the forest resource conservation and management,simultaneously,it will bring out new issues and mission of the forest resource management and conservation.
集体林权制度改革的深入推进,将对森林资源保护管理产生积极的推动作用。
6)  management and protection
管理保护
1.
In combination with the experiences of water resources administration of recent years, the measures taken for the management and protection of the large karst springs are proposed.
本文着重论述这19处岩溶大泉污染类型及污染途径,对主要污染物及污染原因进行分析,并结合近年来的水资源管理经验,提出了对岩溶大泉的管理保护措施。
补充资料:阳极保护管壳式换热器
分子式:
CAS号:

性质:采用阳极保护技术的管壳式换热器。通过向管壳式换热器施加阳极电流,使其处于钝化状态而免受换热介质的腐蚀。换热器由铬镍不锈钢等可钝化的金属制作,设有一根或数根与壳体绝缘的阴极以及供控制、监测用的辅助电极,采用带自控系统的低压直流电源(通常为恒电位仪)维持换热器表面电位处于钝化电位,使设备得到保护。主要用于硫酸生产中干燥塔和吸收塔循环酸的冷却。其特点是:耐腐蚀,寿命长,传热系数高,不污染环境,可回收低温位余热。

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