Monday 1 December 2014

FLAG OF CONVENIENCE


                                            FLAG OF CONVENIENCE

            Flag of convenience (FOC) also known as "flag of necessity"
 A flag of convenience ship is one that flies the flag of a country other than the country of ownership
FOC
1) Whether the country allows non citizens to own and control vessels.
2) Whether access to and transfer from the registry is easy.
3) Whether taxes on shipping income are low r non existent.
4) Whether the country of registration does not need the shipping tonnage for its own purposes but is keen to          
     earn the tonnage fees.
5) Whether manning by non-nationals is freely permitted.
6) Whether country lacks the power (or the willingness) to impose national or international regulations on the
      ship owner using its flag.
        In defining an FOC register, the ITF takes as the most important factor whether the nationality of the ship owner is the same as the nationality of the flag.

  the flag of convenience affects the standards of shipping all the way
 Some of these registers have poor safety and training standards, and place no restriction on the nationality of the crew. Sometimes, because of language differences, seafarers are not able to communicate effectively with each other, putting safety and the efficient operation of the ship at risk.
In many cases these flags are not even run from the country concerned.
Once a ship is registered under an FOC many shipowners then recruit the cheapest labour they can find, pay minimal wages and cut costs by lowering standards of living and working conditions for the crew.

THE FOC VESSELS
MANY OF FOC VESSELS ARE

1. UNSAFE
 Many FOC vessels are older than the average age and badly maintained
2. UNPROTECTED
 Poor safety practices andAccidents are frequent, but for many shipowners the delivery of cargoes and the costs of any delay are their only concerns.
3.Unpaid
  The  crews owed large sums of money. Some crews simply aren't paid. Those that are sometimes find that companies delay, or fail to make, payments to their families when they want to send money home. In many cases months go by without any sign of money promised to seafarers. With no pay they cannot even afford to escape and make their own way home.
4.Insecure
the terrorist organisations can own and operate ships under the FOC system with impunity. Arms smuggling, the ability to conceal large sums of money, trafficking in goods and people, and other illegal activities can also thrive in the unregulated havens which the FOC system provides.

 using below link of itf the seafarer can find out the vessel and its itf agreements
http://seafarers.oxfordwebapps.com/find-vessel


Current Registries Listed as FOCs

The following 34 countries have been declared FOCs by the ITF's Fair Practices Committee (a joint committee of ITF seafarers' and dockers' unions), which runs the ITF campaign against FOCs:
  • Antigua and Barbuda
  • Bahamas
  • Barbados
  • Belize
  • Bermuda (UK)
  • Bolivia
  • Burma
  • Cambodia
  • Cayman Islands
  • Comoros
  • Cyprus
  • Equatorial Guinea
  • Faroe Islands (FAS)
  • French International Ship Register (FIS)
  • German International Ship Register (GIS)
  • Georgia
  • Gibraltar (UK)
  • Honduras
  • Jamaica
  • Lebanon
  • Liberia
  • Malta
  • Marshall Islands (USA)
  • Mauritius
  • Moldova
  • Mongolia
  • Netherlands Antilles
  • North Korea
  • Panama
  • Sao Tome and Príncipe
  • St Vincent
  • Sri Lanka
  • Tonga
  • Vanuatu
 all datas are taken from itf website
http://www.itfseafarers.org/focs-to-seafarers.cfm

Thursday 27 November 2014

CHIEF ENGINEER HANDING OVER

NUMBER OF DOCUMENTS HANDED OVER BY CHIEF ENGINEER DURING SIGN OFF:
1.    List of status of surveys/certificates , quarterly listing
2.    ‘Condition of class’ (stated) if any
3.    Handing over report
4.    Fuel oil, diesel oil/lube oil soundings confirm actual figures
5.    Voyage requirements for fuel. Lubes
6.    Bunkers expected and consumption record
7.    Oil record book
8.    ‘PMS’ status of main, auxiliary and electrical machineries
9.    Spares onboard
10. Stores onboard
11. Alarm checklist
12. Critical equipment checklist, critical spares,critical spare list
13. Special and precision equipment & tools onboard
14. Records of port state inspections - LSA / FFA
15. Cargo equipment maintenance records
16. Technical file: list of critical components/spares affecting NOx/SOx
17. Bunker delivery receipts
18. Special tools
19. List of manuals and drawings available on board
20. Training records
21.updated engine room log book and abstract
22. defect list
23. ods records
24. removal reports
25. pending repair list
26. requisition stores spares,pending requisitions
27.monthly,quarterly reports and lists
 28. communication with company/supdt.

Sunday 12 October 2014

SELF PRIMING CENTRIFUGAL PUMP

                                           SELF PRIMING CENTRIFUGAL PUMP


               PUMP CASING IS DIVIDED TO TWO CHAMBERS.  THE SUCTION CONNECTION IS PROVIDED AT THE TOP MOST OF THE FIRST CHAMBER SPACE. THE PUMP IMPELLER ROTATES INSIDE THE SECOND CHAMBER .THE SECOND CHAMBER CARRIES A DELIVERY  CONNECTION AT ITS TOP SIDE AND SHAFT BEARING AND GLAND AT ONE SIDE. A ROUND PASSAGE IS PROVIDED ON THE CHAMBER PORTION,FIRST IN FRONT OF THE IMPELLER A SMALL NOZZLE IS PROVIDED AT THE CENTER OF THE ROUND PASSAGE IS CONNECTED TO THE IMPELLER CHAMBER AND PRIMARY CHAMBER, A FLAP VALVE  WHICH IS EMPLOYED ON THE SUCTION LINE CONNECTION IS USED TO MAINTAIN THE VACCUM PRESSURE AT THE SUCTION LINE
    SUFFICIENT AMOUNT OF WATER IS ALWAYS MAINTAINED INSIDE THE CASING WHEN IMPELLER ROTATES IT SUCKS THE WATER AS WELL AS THE AIR-FROM THE SUCTION LINE THROUGH THE ROUND PASSAGE AND THROWS OUT TOWARDS THE DISCHARGE LINE AS THE DENSITY OF AIR IS LESS THE AIR ESCAPES OUT THROUGH THE DISCHARGE LINE AT THE SAME TIME SOME AMOUNT OF DISCHARGE WATER AGAIN COMES IN TO ROUND PASSAGE THROUGH THE SMALL NOZZLE.DUE TO CONTINUOUS OPERATION. THE AIR IN THE SUCTION LINE SLOWLY  PRIMED UP THROUGH THE DISCHARGE LINE.AS THE AIR IS COMPLETELY SENT OUT IN TURN VACCUM IS CREATED AT THE SUCTION LINE WHICH PASSES THE WAY FOR WATER TO ENTER THE PUMP

SELF PRIMING CENTRIFUGAL PUMP





Friday 10 October 2014

HYDRAULICS VANE PUMP



VANE PUMP
                A rotor is mounted in a elliptical casing between closely fitted end plates. The slots, which are made radially in the rotor carries the vanes in it. The rotor shaft is located in escentrically in relation to the housing when rotor rotates the vane proceed from the point of shortest distance between rotor and housing increased space will be created between rotor and housing. This space fills with oil supplied through a peripheral value slot from the suction port. After  the maximum distance between rotor and housing has been passed. The space between rotor and housing decreases and oil is discharged through the opposite value port. The vanes are sliding out up to the outer track by means of centrifugal force. As the centrifugal force is insufficient to hold the vane against the track during high pressure, the pressure of oil is applied to the bottom of vanes through drilled holes and semi-circular groove made on the end plates. In this design the rotor is subjected to a heavy, unbalanced load the hydraulic pressure in the discharge area acts against the rotor resulting in heavy loading of the rotor bearings. This difficulty has been avoided by providing two intake and two discharge .diametrically opposite each other and thus the hydraulic loads on the rotor balance each other.in this design the vane track is made elliptoid instead of circular, having two minimum and two maximum centre distance
                Vane pumps are being made in both constant and variable discharge design the volumetric efficiency of vane pump is 90% and over. The direction of flow can be reversed by reversing the rotation of the pump
                vane pump requires great accuracy and close tolerance .commercial vane pumps are provided separate valve plates (port slot plate).the space in between suction and discharge ports called lap space is equal to the pitch distance of the vanes .in addition to the single pump a great number of combination of pumps are available these combination consists of two or more pumping units mounted in one casting
CONSTRUCTION MATERIALS
Externals (head, casing) - Cast iron, ductile iron, steel, and stainless steel.
Vane, - Carbon graphite,
End Plates - Carbon graphite
ADVANTAGES OF VANE PUMP
 Vane pumps are robust, self-priming.
 Vane pump provides uniform discharge with negligible pulsations.
 Vane pump vanes are self-compensating for wear.
 The vanes can be easily replaced.
 These pumps don't require check valves.
 They have relatively high efficiency.

DISADVANTAGES OF VANE PUMP
 Vane pumps cannot handle abrasive liquids.
Complex housing and many parts  
 Not suitable for high viscosity
Not suitable for high pressures , the pressure within the pump chamber increases, the vanes begin to lose the ability to maintain contact with the walls of the pump chamber.
TYPES OF VANE PUMP
There are two important types of vane pumps that are used in day today life:
1. Unbalanced vane pumps
a) Fixed displacement unbalanced pump
b) Variable displacement unbalanced pump
2. Balanced vane pump
1.UNBALANCED VANE PUMP
In the unbalanced vane pump, the rotor is mounted elliptical casing as off center. The rectangular vanes fitted radially on rotor slots regular intervals, these rectangular vanes are free to move in the radial slot. The vanes are thrown outwards due to the centrifugal force to form a seal against the fixed casing as the rotor starts to rotate. The eccentricity of the revolving rotor produces a partial vaccum at the suction side of the pump which causes the inflow of the liquid. This is carried to other side of the pump in the space between the rotor and the fixed casing. the pumping action occurs in the chambers on one side of the rotor and shaft. This design imposes a side load on the rotor and drive shaft. The pumping rates of these rotary pumps are varied by changing the speed of the rotor. But in unbalanced vane pump, the pumping rate can also be varied by varying the degree of eccentricity of the rotor, since this determines the amount of liquid carried through per cycle.

(a) Fixed displacement unbalanced vane pumps
In the fixed displacement unbalanced vane pump, a constant volume of fluid is discharged during each revolution of the rotor that is provided. This achieved by keeping the rotor housing eccentricity as constant and therefore the displacement volume is fixed.


 




(b)Variable displacement unbalanced vane pump
In the variable displacement unbalanced vane pump the housing can be moved with respect to the rotor. This movement changes the eccentricity and the displacement can also be varied. A hand wheel or pressure compensator can be used to move the can ring and thus to change the eccentricity.










2.BALANCED VANE PUMP
In the balanced vane pump, it consists of two intake ports and two outlet ports and they are diametrically opposite to each other. And also in the balanced vane pump an elliptical housing is used in balanced vane pump rather than cam ring that is used in unbalanced vane pump. This configuration creates two diametrically opposed volumes. The two high pressure zones balance the forces on the rotor shaft and hence complete hydraulic balance is achieved. These descriptions are the only difference from unbalanced vane pump other than this construction and working principle is as same as the unbalanced vane pump.