各夹套的优劣？ conventional jackets - a conventional jacket is shown in figure 1. spiral baffling within the jacket as shown in figure 2 should be used. conventional jackets are a good choice for small vessels ( 2 x jacket pressure). they are not recommended for jacket pressures greater than 100 psi (680 kpa) or high temperatures. 全夹套一般应用于容积1.9方以下或容器压力 2x夹套压力,不推荐应用于夹套压力大于680kpa的场合. half-pipe jackets - a typical half-pipe jacket is shown in figure 3. they are useful for high pressures (up to 600 psi or 4082 kpa) especially when jacket pressure determines the vessel wall thickness. half-pipe jackets are better for liquid than for vapor service fluid. they can be easily zoned so that only a portion of the heat transfer area is used. a 3 in. (76 mm) nominal pipe size is typically used for forming the jacket. for maximum heat transfer, the space between the half-pipe coils is 3/4 in. (19 mm). however, if the inside heat transfer film coefficient is low, the space between the half-pipe coils can be increased without significant loss in heat transfer surface. 半管夹套应用于夹套压力可到4082kpa,特别是当容器的厚度是由夹套压力决定时,半管夹套更适用于液态介质.后面不翻了. dimple jackets - a typical dimple jacket is shown in figure 4. such jackets are suitable for larger vessels, particularly when jacket pressure determines the vessel wall thickness (pjacket/pvessel 0.6). they are satisfactory up to 300 psi (2041 kpa) and 700°f (371°c). high jacket pressure drops are encountered with liquid flows. typically the dimples are on a square pitch of 2.5 in. (63.5 mm). 蜂窝夹套,适用于大直径的容器,特别是夹套压力决定容器的厚度时(夹套设计压力/容器设计压力 0.6).在2041kpa@371°c以下的负载下它都令人满意,但蜂窝夹套如果应用于液体介质时会有较大的压降,典型的蜂窝孔间距是63.5mm.查看更多
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