Classification of Diesel Engines

 

 

Diesel engines are divided according to operating cycle, method of charging

the cylinder and general design. So diesel engines may operate on a constant

pressure cycle (large slow-speed air injection engines) and on a combination cycle

when part of the fuel burns at constant volume and part of the fuel burns at

constant pressure.

There are four-stroke and two-stroke engines. In four-stroke engines the

piston and the cylinder act as a pump which removes products of combustion and

 

fills the cylinder with fresh air charge. In two-stroke engines the cylinder is

scavenged and filled with fresh compressed air charge by an external pump. By

general design all engines may be divided into single-acting and double-acting.

The main working parts of a diesel engine are the cylinder, the cylinder

head, the piston, the connecting rod, the crankshaft, the fuel pump and fuel nozzle.

The auxiliary parts are the cylinder liner, the crank pin, the piston rings, the valve

springs, the crankcase and others.

 

 

2) 180100.62 «Кораблестроение, океанотехника и системотехника

объектов морской инфраструктуры» (только для профиля

кораблестроение)

 

 

A Ship

 

 

The main parts of a ship are a hull, some decks and deck superstructure. The

hull is the body of the ship. It is painted grey, white and black. There are two lines

on the sides of each ship. One line shows the draught with a full cargo. The other

line shows the draught without cargo in her holds. These lines help to control the

degree of submergence and to avoid overloading.

Inside the hull there are frames and beams that make the ship stronger and

help to withstand pressure from outside and from inside. The forward part of a ship

is called her bow, the after part – the stern or aft. The lowest part is called a

bottom. The space under the bottom is a double bottom for carrying fuel, oil, fresh

water and water ballast.

The part of the hull below water is ship’s quickwork. The part above the

water is ship’s freeboard. Many ships have three decks: the main deck, the upper

deck and the lower deck. There are some openings in the deck: ventilators, scuttles

and skylights. They are used for free passage of air and light.

Cargoes are loaded into holds through hatchways which are closed with

hatch covers. There are cargo-handling appliances and machinery on deck, such as

winches, derricks, windlasses, capstans.

Deck superstructures are accommodation for the crew.

 

Types of Cargo Ships

 

 

Modern ships deliver cargoes all over the world. They carry general cargo,

bulk and liquid cargoes. Dry cargo ships transport packed cargo in boxes, bags,

barrels, bales, container; they can carry heavy weights, timber logs. Containers are

loaded and discharged by ship’s own derricks or by shore-based cranes.

Bulkers carry unpacked cargo, such as grain, ore, coal, fertilizers, wheat etc.

The holds of bulkers are self-trimming. Tankers are specially designed to transport

liquids: crude oil, liquefied gas, petroleum. Tankers are equipped with pipes,

valves and pumps to handle cargo.

There are special vessels that do auxiliary service. Tugs assist ships when

entering or leaving the ports and take part in salvage operations. Salvage vessels

rescue ships, their cargoes and passengers, if any. Icebreakers sail in northern icy

areas. Dredgers deepen port fairways, anchorages, roadsteads.

Ro-Ro ships load and unload cargo via a ramp placed on the berth. Liners

carry cargo between fixed ports. Tramps have no fixed schedule, fixed ports of

destination and fixed ports of call.

 

 

3) 270800.62 «Строительство»

 

 

A Port

A port is a protected place where ships can load, unload and ride at anchor.

There are commercial ports, military, industrial, fishing and ports of refuge. By

their geographical situation ports can be ocean and inland waterway ports.

Ocean ports are usually located in natural harbours, in bays, tidal estuaries

and river mouths. They also may be formed on an unprotected shore line by the

construction of breakwaters. Inland waterway ports are constructed on navigable

rivers, canals and lakes. River ports have no wave-protecting structures.

Every port should be readily accessible, provide good shelter and

accommodation. The accessibility of a port depends on the depth of water in the

approach channel. This channel is deepened by dredging. The configuration of the

coast line influences the amount of shelter.

 

A modern port should be provided with terminal facilities, such as piers,

wharves, quays, docks or berthing places for ships. Their main function is to

handle passengers and cargo.

Every port has hoisting facilities, storage areas, such as warehouses, transit

sheds, port cold stores, and ship repair facilities. There are special complexes

which specialize in handling specific types of cargoes (general cargo, timber, oil,

ore, coal, containers).

Port communications increase the efficiency of cargo-handling operations

and delivery of cargo. Goods must be turned around a port as rapidly as possible.