![]() The steam rises up the flash drum through a demister, and upon contacting the condenser tubesis condensed and pumped via a salinometer to the fresh water or boiler water feed tanks. Some of the hot seawater flashes of to steam in the first section, before going on through remaining sections, flashing as it moves through them. The heated seawater is pumped into the flash drum, which has numerous sections all at a lower pressure than that of the water heater. ![]() The seawater can be heated using steam or the main engine cooling water, depending on the main propulsion unit. This type of evaporator uses a multi-stage process which has two components, the seawater heater and the flash drum, with these being two separate units. Here we shall examine the following types: There are numerous types of evaporators and osmosis equipment used to produce fresh water from seawater on our ships today. We begin with an examination of the types of evaporators used aboard ships. In this article we shall examine two categories of water evaporators, tube and flash, and have a look at how osmosis equipment operates to produce fresh water from seawater. In the following sections we will examine the current evaporators in use, fresh water and condensate storage tanks, and condensate feed water testing. Nowadays, there are several very efficient types of evaporators still using the same heat sources, and of course we now use osmosis as well. ![]() As I gained experience and promotion, one of my duties as 4th Engineer was looking after the vaps, as we called them (among other things). In those days we had evaporators which used steam from the boilers or the main diesel cooling water as a heating medium to evaporate the seawater. When I was a lad at sea many years ago, I sailed on motor and steamships as an Engineering Officer.
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