立管压力波动幅度随气相折算速度的增大先增大后减小；
The pressure fluctuation of the riser first increases then decreases with the superficial gas velocities;
如果立管压力的变化规律与泵冲数的变化规律不一致，预警解决方案就可以识别出来。
The alarm solution identifies changes in the SPP that are not consistent with the changes, if any, in SPM.
本文主要进行了以下三方面试验研究：第一，稳定压力下UPVC普通单立管、双立管压力波动的模拟试验。
This Paper conducted a pilot study by the following three areas:Firstly, pressure fluctuation experiments of UPVC single pipe, double pipe under the steady pressure condition were conducted.
该预警系统中采用的逻辑关系还考虑了钻机的活动，避免由于管道连接或其他非钻井活动造成的，与立管压力无关的虚假报警。
The logic used in this alarm includes the rig activity, to avoid false alerts for pipe connections and other non-drilling activity, where SPP is not relevant.
下部特殊管件设计，消除水舌、水塞、水壅等现象，保持立管内空气畅通，有效保证管道内的压力平衡，可大幅度提高系统的排水能力。
Upper and under connection design which avoid water block, keep air smooth in the pipe, sure the pressure balance in the pipe, is good to improve drainage ability.
第三，判定排水立管通水能力的关键是根据系统内部压力波动造成水封破坏这一边界条件。
Thirdly, the key of determining the discharge caPacity of the drainage pipes was according to the boundary condition that the pressure fluctuations within the system caused seal damage.
电炉铜冷却设备(炉盖，压力环、铜瓦、保护屏，导电立管等)：电炉铜冷却设备应用在大功率矿热炉等电弧炉上。
Copper cooling equipments for electrical melting furnaces are applied to electric arc furnace, like high-power smelting electric furnace.
电炉铜冷却设备(炉盖，压力环、铜瓦、保护屏，导电立管等)：电炉铜冷却设备应用在大功率矿热炉等电弧炉上。
Copper cooling equipments for electrical melting furnaces are applied to electric arc furnace, like high-power smelting electric furnace.
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