Heat exchangers. Plate type. Operation, maintenance and troubleshooting. Words and expressions.

troubleshooting - выявление повреждений

to reduce - уменьшать, снижать

considerably - значительно

filling - заполнение

occasionally - изредка, время от времени

afterwards - впоследствии

circumstance - обстоятельство

О- ring - уплотнительное кольцо

connection - связь, соединение

gasket - прокладка

sealing surface - уплотняющая поверхность

deposits - отложения

flow rate - расход

visible - видимый

further - далее, затем, зд: сильнее

deformed - деформированный

double - двойной

adjoining plate - прилегающая (примыкающая) пластина

volume - объем, размер

to decrease - уменьшать

respective - соответствующий

hole - отверстие

to apply - применять

opposite side - противоположная сторона

TEXT

Temperature of coolers is controlled by adjusting the cooling liquid outlet valve. The inlet valve is left open which ensures a constant pressure within the cooler. This is very important with sea water cooling where reducing pressure can result in air remaining in a cooler which will considerably reduce the cooling effect. Vents provided in the highest point of coolers should be opened on first filling and occasionally afterwards. Drain plugs are also fitted at the lowest point in coolers.

The plate heat exchangers should be opened and cleaned regularly and under normal circumstances every six months. The Q-rings in the connections, the gaskets and the sealing surfaces on the back of the plate should be checked before the heat exchanger is re­assembled.

Symptom cause remedy

1. Reduced cooling a) Deposits a) Check the heat transfer efficiency. surface for deposits and

if any remove them.

b) The flow rates b) Check that flow rates for

for oil and water are oil and water are correct.

Incorrect.

2. Leakage visible on a) The plate pack is a) Tighten the plate pack

the outside of the not tightened enough. further.

plate pack.

b) The gaskets and b) Replace the gaskets and

sealing surfaces are the damaged plates.

not clean and the

plates are deformed.

c) Corrosion between c) Replace the gaskets or

the double gaskets the plate.

or in the same area

of the adjoining plate.

3. Fresh water or There is a hole in Remove the lower sea lubricating oil decrease the plate. water valve, apply a test volumes pressure on the opposite side in the respective and, if liquid flows from the systems. side under pressure, replace

the faulty plate.