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TOEIC Link Vocabulary Cluster — Fresh Water Generator and Evaporator Survey: The Report Lexicon for the Plant That Makes Drinking Water from the Sea

A fresh water generator survey examines the evaporator a ship uses to distil seawater into fresh water — the shell where seawater boils under vacuum, the plates that transfer engine heat into it, the ejector that holds the vacuum, and the salinity control that decides whether the water is fit to drink. This cluster isolates the 40-plus terms the survey deploys and maps each to its register tier and native collocation, so a TOEIC Link marine survey reading passage becomes a domain you read at speed rather than decode word by word.

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TOEIC Link Vocabulary Cluster — Fresh Water Generator and Evaporator Survey: The Report Lexicon for the Plant That Makes Drinking Water from the Sea

A ship carries only a few days of fresh water in its tanks, so on a long voyage it makes its own. The fresh water generator does it by distillation: seawater is boiled under vacuum at a low temperature using waste heat from the main engine's cooling water, and the vapour that rises is condensed back into salt-free fresh water. Because the crew drinks that water and because the plant runs continuously on engine heat it would otherwise waste, the fresh water generator is surveyed on a fixed workflow — and that workflow recurs as a source domain for TOEIC Link marine survey reading passages. The sequence is stable: the vacuum is drawn, the seawater is heated and boils, the vapour is condensed, and the product water is tested and either accepted or dumped. That sequence generates a cluster of roughly forty terms, and a candidate who owns it reads the passage at native speed while a candidate who does not stalls on the process nouns and loses the argument.

This guide isolates the cluster, groups it by process stage, and maps each term to its native collocation and register tier, because TOEIC Link scores writing as well as reading. Pair it with the writing vocabulary precision and collocation discipline guide for the skill of choosing the exact term, and with the boiler and pressure vessel survey safety-valve cluster, whose heat-exchange and pressure vocabulary overlaps directly with the heating side of the evaporator.

Why this cluster rewards study

An evaporator passage assumes its vocabulary the way a boiler or purifier passage does. If a reader decodes brine, ejector, and salinometer one word at a time, the attention the module intends for the inferential questions is consumed by decoding. Learning the cluster converts those stalls to zero and frees the reader to answer what the passage actually asks — why a plant that produced water was still condemned, what a salinity reading was measured against, and where in the argument the disputed setting lies.

Stage 1 — The vacuum and the shell

Seawater boils at a much lower temperature under vacuum, which is what lets low-grade engine heat drive the plant. The survey begins at the ejector — a water-driven pump that draws and holds the vacuum inside the evaporator shell — and confirms the shell holds its vacuum without leaking air. The register here is exact: the shell is proved to hold vacuum, not "sealed," and a finding of air ingress reducing the vacuum is a defect that raises the boiling temperature and starves production. The passage often turns on that distinction between a plant that boils at the right low temperature and one whose lost vacuum has driven the boiling point up.

Stage 2 — Heating and evaporation

Inside the shell, hot jacket water from the main engine passes through a heating plate stack or heating coil, giving up its heat to the seawater, which evaporates. The survey confirms the heating surface is clean and not scaled, because scale on the plates insulates them and cuts production, and that the seawater feed is at the correct rate. The concentrated seawater left behind is brine, and the survey confirms the brine pump or brine ejector removes it before it over-concentrates and scales the plates faster. The register distinction matters: a heating stack is confirmed clear of scale, and a finding of heavy scaling on the heating plates is a heat-transfer defect distinct from any fault in the vacuum system upstream. The passage usually makes the reader locate which side of the plant a lost-production finding belongs to.

Stage 3 — Condensation and the product

The vapour that rises off the boiling seawater passes to the condenser, where cold seawater flowing through a second plate stack cools it back to liquid — the distillate, or fresh water. The survey confirms the condenser is clean and the distillate pump delivers the product to the tanks. The critical check is quality: because a leak or a carry-over of salty droplets would contaminate the product, the plant carries a salinometer that measures the salinity of the distillate continuously. The register is unforgiving here: the product is proved within the salinity limit, and a finding that the distillate exceeded the salinity limit is a quality defect that must divert the water — the same divert-on-failure logic a reader will recognize from the oily-water and purifier surveys.

Stage 4 — Control, protection, and the record

The survey closes at control and record. The plant runs on an automatic controller, and the survey confirms the salinity alarm, the solenoid dump valve that automatically diverts out-of-spec water back to the sea, and the low-vacuum and high-salinity trips. Because the crew will drink the product, the survey also confirms the mineralizer or UV steriliser that treats the distillate before it reaches the potable tanks, where fitted. The record — the maintenance log, the last plate cleaning, and the class survey status — is confirmed complete and signed. The register here is the sharpest in the survey: a plant is accepted only when it holds vacuum, produces within the salinity limit, and its record is in order, and a finding that the dump valve failed to divert on high salinity stands as a protection defect on its own, in the way a little scale on the plates does not. The passage's most demanding questions usually live at exactly this boundary between a performance defect that is cleaned and a protection defect that stands as a finding.

How to drill this cluster

Read the terms in process order — vacuum and shell, heating and evaporation, condensation and product, control and record — because that is the order the passage will deploy them, and a cluster learned in workflow order is recalled in workflow order. Then write three report sentences of your own: one confirming a plant that produced within the salinity limit at full output, one condemning a dump valve that failed to divert on high salinity, and one recording an overdue plate cleaning as a survey-record defect. Writing the cluster is what moves it from recognition to production, which is the difference TOEIC Link measures. For the shared heat-and-pressure language of the heating side, work the boiler and pressure vessel survey safety-valve cluster alongside this one, and for the register discipline that turns recognized terms into precise report sentences, work the writing vocabulary precision and collocation discipline guide.