TEXT1 WORDS AND EXPRESSIONS

auxiliaries	- вспомогательные двигатели
air compressor	- воздушный компрессор
heat exchanger	- теплообменник
distillation equipment	- опреснительное оборудование
bilge water	- льяльные воды, сточные воды
sewage treatment plant	- установка для обработки сточно-фекальных вод
incinerator	- инсинератор
to range	- колебаться (от)
multi-stage	- многоступенчатый
common	- распространенный
crank	- кривошип
second stage piston assembly	- поршневой блок второй ступени
first stage cooler tubes	- охладитель первой ступени
to reach	- достигать
first stage drain	- клапан продувания первой ступени
second stage drain	- клапан продувания второй ступени
steady reading	- устойчивое показание (прибора)
moisture	- влага, влажность
to clear	- очищать
reciprocating machinery	- поршневые механизмы
troublesome	- причиняющий беспокойство
constant	- постоянный
rapid	- быстрый
to reface	- зд: восстанавливать поверхность(притиранием)
incorrect	- неправильный зд: нерекомендованный
dirt	- грязь
to stick	- зд: заклинивать
to pit	- подвергаться язвенной коррозии
to strip	- разбирать
to lap	- шлифовать
reassembly	- повторная сборка
seal	- герметичность

 

TEXT

Machinery other than the main propulsion unit is usually called auxiliary. These include the following: air compressors, heat exchangers, distillation equipment, oil / bilge water separators, sewage treatment plants and incinerators.

AIR COMPRESSOR

Compressed air has many uses on board ship ranging from diesel engine starting to the cleaning of machinery during maintenance. The air pressures of 25 bar or more are usually provided in multi-stage machines. Here the air is compressed in the first stage, cooled and

compressed to a higher pressure in the next stage and so on. The most common is two stage crank machine.

STARTING

The compressor motor is started. The lube oil pressure should reach the correct value The first stage drains and then the second stage drains are closed and the machine willbegin to operate. The pressure gauge cocks should be adjusted to give a steady reading. Where manual

drains are fitted they should be slightly opened to discharge any moisture which may collect in the coolers. The cooling water supply should be checked as well as operating temperatures.

STOPPING

To stop the compressor the first and second-stage cooler drain valves should be opened and the machine run unloaded for 2 or 3 minutes which will clear the coolers of condensate. The compressor can now be stopped and the drains should be left open.

 

MAINTENANCE AND OPERATING TROUBLES AND REMEDY

Maintenance involves the usual checks and overhauls common to reciprocating machinery, e.g. crankcase oil level, cooling water system, operating temperatures and pressures, etc. The suction and delivery valves are most troublesome. These valves are automatic requiring a small pressure differential to operate.

The constant rapid opening and closing action of the valves may require seats to be refaced. Overheating, use of incorrect lube oil or the presence of dirt may result in sticking or pitting of the surfaces. The suction and delivery valves should be stripped and all parts carefully cleaned and examined and worn parts replaced and the valve seat and plate lightly lapped before reassembly to ensure a good seal. (1700)

 

 

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