IT IS THE ALLAH WHO SUBJECTED THE SEA TO YOU.THAT SHIP MAY SAIL THROUGH IT BY HIS COMMAND ,THAT

YE MAY SEEK OF HIS BOUNTY,AND THAT YE MAY BE GRATEFUL

(Al-Quran)

Marine Engineering

DC and AC Generators

DC Generator

• Direct current motors is generally divided into three categoriesShunt wound Generator Series wound GeneratorCompound wound Generator

• balancer

Shunt Wound Generator

• The shunt is attach in parallel with the motors

• Speed drops but little with increasing load

Series wound Generator

• Series falls heavily with increasing load starting torque is high

• Speed falls heavily with increasing load starting torque is high

Compound wound motor

• Shunt and series both are attach in compound motor

• This motor can function of shunt as well as series motor.

Generator #01

1. Radiator

2. Belt driven fan (plastic)

3. Fresh water pump (coupled with Crankshaft)

4. Oil filter (lub oil)

5. Turbocharger

6. Air filter

7. 24VDC Battery

8. Governor (for oil controlling) Mechanical

9. Starter (Self) attach in the gearbox

10. Lub oil filter (with bottom hole to check oil quantity)

Generator #01 (cont.)

11. Oil pump (lub)

12. Oil pan

13. Dip stick

14. Fuel filter (diesel)

15. Fuel pump

16. Exhaust manifold

17. Injector

18. Thermostat

19. Oil pressure

20. Exhaust valve

Generator #01 (cont.)

Prime Mover side

Manufacturer name: Detriot

Engine combustion: Diesel

Stroke: 4stroke

Model:

Manufacturer:

Generator #01 (cont.)

Alternator side (Brushes)

Model No. E7315

Serial no. 78A80

KW con : 100KW

Apparent power: 125KVA

Power factor : 80%pf

Phase: 3 phase

Frequency: 60Hz

RPM: 1800rpm

Excit field: 82A ; 43V

Ins Cl: F

Arm H field

45centigrade Max Amb.

DELCO PRODUCTS DIV OF GM COP. DAVTOH USA

Author Introduction

ZEESHAN AHMED, Marine Engineer. After doing FSc(pre-engineering) from PAF(fazaia) intermediate college Lahore cantt. I joined Pakistan Marine Academy and choose Marine engineering branch. Two years of training at academy (practical + theoretical) we learned a lot of thing like CNC (computerize numeric code), trained on various models (like control valve, solenoid valve, flow meter, refrigeration system,

CPP propeller, Main engine model (TWO stroke), Boiler model (water tube) ……………………………….. in GEK (general engineering knowledge) lab, Mechanical and physics lab, Engineering workshop. ETC . After two years, we joined PNSC workshop for the training of ONE year Industrial training. That was also the golden time where we learnt a lot of things at different shops as well as onboard (repairing and watch keeping). I learn many thing on tankers E.g. MT Johar (learn how to dismantle turbine rotor from casing and what are the precautionary measurement while working on turbine, learn how to change the diaphragm(stationary blade) Plate type heat exchanger gasket change, shell and tube Cooler Anode replacement and (Cont.)

Introduction (cont.)cleaning of SALT WATER tubes etc.) , MT Swat (major thing which I learn in Swat is how to dismantle head of main unit and copper gasket replacement with a minor facing defect which is found during overhauling which is filled and faced by Belzona) , MT Lahore(About the DEAD MAN ALARM, Alpha lubricator for Cylinder Main Engine Unit, Pump operation and watch keeping), MT Quetta(Auto load sharing of Generator Set, MT Karachi (Dry washing of the main engine turbocharger with granules, water washing of IG Fan of Inert Gas system, sludge removal of from purifier(centrifuge) etc. Beside the learning routine I learn many thing also on Cargo ship. The total flooding system for Engine room and Flooding system for Cargo holds. MV Islamabad (working on monkey bridge welding of Fish plate, threshen plate, refrigeration system and air conditioning system, ) ; MV Multan (learn how to change the liner of Units of Main Engine and measurement and cleaning related to unit overhauling; change the Gauge glass of HOT WELL : boiler mountings (dismantle and overhauling, assembling, major thing what we will do incase of BLACK-OUT on ship, Purifier overhauling, etc. (Cont.)

Introduction (contd)One thing I want to added is that the trend in ship building is more toward based on electronic and electrical application. So a marine engineer must strong in automation, instrumentation and control system. PLC (programmable and logic control) and SCADA (supervisory central access and data acquisition) are the upcoming technology that are using on modern ship. The latest engine of MAN B&W is based on Camless technology. Chain is removed ; fuel pump and exhaust valve actuation is control by hydraulic servo(lub) oil which is driven by Axial piston pump mounted on the Fly wheel.

Regards,

Z.A.

Author contact information

• zeetec4@yahoo/gmail/hotmail.comzeetec4@yahoo/gmail/hotmail.com

Social networking sites• Facebook: mariner46

Website: zeetec4.googlepages.com

Any question and suggestion are welcome