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Fire Tube - an overview ScienceDirect Topics 2012-3-12 · The fire tube boiler was created in the 1800s, Fig. 1.7.Its main use was to run steam engines for motive power. One of the first brand names for this type of boiler was the Lancashire boiler, which used two parallel fire tubes. Methods to control for unmeasured confounding in Background Unmeasured confounding is one of the principal problems in pharmacoepidemiologic studies. Several methods have been proposed to detect or control for unmeasured confounding either at the study design phase or the data analysis phase. Aim of the Review To provide an overview

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Fig 1.2 Cylindrical Pressure Vessel ) Spherical Pressure Vessel This type of pressure vessels are known as thin walled vessels. Pressure Vessels - an overview ScienceDirect Topics. Developments in pressure vessels during the nineteenth and early twentieth centuries were accompanied by all-too-frequent catastrophic pressure vessel explosions.Low-Pressure Region - an overview ScienceDirect TopicsThe typical design back pressure for a system is around 0.08 bar. If this vacuum level deteriorates due to air in-leakage, leaky valves, or condenser circulating water (CW)/cooling tower problems, the efficiency of the entire system can decline rapidly.