Open systems using gravity tanks, etc., are rarely met nowadays and Figure 1.8 shows a characteristic arrangement of pressure tanks, calorifiers and pumps for a large ship. The fresh water pumps are self-priming, drawing from storage tanks and discharging through filters to a rising main, branched to give a cold supply and a hot supply in closed circuit through a calorifier. A tank kept under pressure by an external supply of compressed air rests on the system and provides the head necessary

自20世纪50年代以来, 我国已将硐室爆破(chamber blasting)技术广泛应用于矿 山、交通、水利水电、农田 基本建设和建筑工程等领域, 并成功地实施了多次万吨级 的爆破

A fire and bilge pump has suctions from sea, bilge main and engine room bilge, with discharges to fire main, oily water separator and overboard. A ballast pump has suctions from sea, ballast main, engine room , bilge direct and bilge main with discharges to overboard, the ballast main, the oily water separator and possibly, the main salt water circulating system

Air at high pressure, i.e. at 25 bar or more, is required for starting main and auxiliary engines in motorships. Air at low pressure, say at 6 bar or less is required for much remote or temperature or pressure controlled equipment, for which purpose it must be clean and oil-free

Provide for data logging, remote control and automatic action-pneumatic electro￾pneumatic, and electronic equipment, self￾regulating apparatus, etc. The chapter will give a general instruction above system and function. The other chapters of the book focus on the oil handling devices onboard

In motorships the oil, after passing through main and motion bearings and oil-cooled pistons, etc., is either retained in the bedplate or flows by gravity to a sump tank. In either case, the oil pumps, which may be self￾priming, submerged centrifugal or rotary positive displacement, draw the oil through magnetic strainers and discharge to: filters - oil coolers - engine lubricating and/or cooling manifolds

In motorships there are two main circuits, one salt , one fresh. The salt circuit is: sea inlet box (seachest) - pump(s) - f.w. coolers in series (first LT then HT) – turbo blower aftercoolers in parallel (if any) – provision condenser in parallel (if any) - overboard

在铁路建设、水利工程、 采矿工程以及其它土石方工 程中,爆破是目前应用最为 广泛、最为有效的一种破岩 手段。为了优化爆破参数, 必须了解岩石在爆破作用下 的破碎机理、装药量的计算 原理以及各种相关因素对爆 破效果的影响

工业炸药( Industrial explosive) 又称民用炸药( commercial explosive),是以氧化剂和可燃剂为 不在一起 主体,按照氧平衡原理构成的爆炸 岩石铵梯油炸药 南, 国云南包装 性混合物。工业炸药在铁路、公路 建设及煤矿、冶金、石油、地质、 水电、建筑等方面得到了广泛的应 云南包装厂生产 用

课的内容:游泳运动基础知识,游泳与运动健身价值及游泳运动发展动态 课的任务:比较全面了解游泳运动基本知识、掌握竞技游泳、实用游泳的基本知识