The rotary air preheater, which is the widely used tail-end heat exchanging equipment in large capacity boilers with high parameters, has the fatal defect of a high air leakage rating.

回转式空气预热器是高参数大容量电站锅炉广泛采用的尾部换热设备，漏风率高是该类设备的致命缺点。

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The ram BOP is the most important equipment for secondary well control, quick to shut in the well, and of a high pressure rating.

闸板防喷器关井速度快、耐高压，是二级井控最重要的设备。

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For the revamp unit, the product specification target shall be based upon the pressure rating of the existing equipment.

对老装置改造设计应根据其压力等级确定产品的质量目标。

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Veeco shares are trading sharply lower Tuesday after CLSA Asia-Pacific Markets analyst Mark Heller cut his rating on the maker of LED manufacturing equipment to Sell form Underperform.

FORBES: Veeco: CLSA Cuts Rating To Sell; Shares Slide After Big Run