FRESHWATER ALLOWANCE(FWA) & DOCKWATER ALLOWANCE(DWA)
The Fresh Water Allowance is the number of millimetres by which the mean
draft changes when a ship passes from salt water to fresh water, or vice versa,
whilst floating at the loaded draft.
FWA(in mm)...
SPECIAL AREAS OF MARPOL
MARPOL states that specific sea areas as special sea areas where for some scientific reasons related to their oceanographical and ecological condition and to their sea traffic, the acceptance of special compulsory procedure...
INTERNATIONAL MARITIME ORGANIZATION
IMO also recognized by the name IMCO* up to year 1982, is a special agency of the United Nations responsible for regulating shipping. The IMO was accepted following the agreement at a UN conference...
INCLINING EXPERIMENT
This experiment is carried out on new ships and those that have had large structural alterations made, to find out the new centre of gravity (kg) and metacentric height (gm) and further to know...
METALLURGY
Ore is heated in furnace with Coke to a temperature of 1800 °C Various reactions at different stages in furnaceC + O2 = CO2 ( at bottom)CO2 + C = 2CO Fe2O3(s) + 3C(s)...
Propeller curve
The propeller with perfect pitch/diameter ratio will be the one whose propeller power curve and engine HP curve meets at maximum RPM. Therefore, a propeller curve is a very much significance for chief engineer
Significance...
Stuffing box
PURPOSE OF STUFFING BOX
Provides sealing between Scavenge space and CrankcaseUpper section prevents scavenge air & residues from scavenge space entering crankcase
Lower section prevents oil carry over by piston rod from crank...
TESTS ON ENGINE
TESTING OF MARINE ENGINES
(1) Manufacturers’ Acceptance Test
Here, tests are carried out at the manufacturers’ test
bed to check whether the performance values are within the acceptable standards
of specification.
(2) Sea Trial Test
Here, tests are carried...
BOILER REFRACTORY
The material in solid form which has the capability of withstanding its shape at very high temp of about 1650°C. • Safeguard boiler casing from overheating and distortion and possible...