PORTABLE FIRE EXTINGUISHER MECHANICAL FOAM

MECHANICAL FOAM

• used for classA and ClassB fires
• 74g of co2 cartage will be used @36 bar pressure
• 97% of water and 3% of AFF ( aqueous Film forming foam)
• Duration 60sec 
• length of flow 6meter
• AFF contain- surfactant such as sodium alkyl sulfate, fluoro surfactant such as fluoro telecom atomic  acid.

Safeties

• Safety pin
• Relief valve

PORTABLE EXTINGUISHERS WATER TYPE FIRE EXTINGUISHER

 WATER TYPE FIRE EXTINGUISHER

• Used for classA and ClassB fires like (wood, paper)
• Should use Minimum 9 to maximum 13.5 lit capacity of water as per the solas regulation.
• 74g of cg cartage should be used 
• Duration 60 seconds lenth of the 6 meter 
• Pressure will difference as per the capacity and weight of the cylinder.

Safeties

• Relief hole, and safety pin 

Maintenance

• Weekly:
• Check and clean the nozzle and seal.

• Monthly:
• Check internal and external 
• And co2 cartage and safety pin and weight

• Yearly
• Pressure test @ 36 bar

AIR COMPRESSOR MANUAL STARTING PROCEDURE

Air compressor starting procedure manually.

1. Change over the switch to manual position on the switch board.
2. Check the L.O sump level and condition.
3. Open the moisture drain valve. 
4. Open the compressor discharge valve and charging valve of air bottle.
5. Open cooling water system valves.
6. Turn  compressor flywheel by hand (one turn)
7. Now Start the motor, after that  draining the moisture and shut the drain valve.
8. Check the motor ampere consumed.
9. Check the pressure gauge readings.
10. Frequently drain the moistures.
11. Once the charging full, open drain valve and stop the compressor.

PURIFIER OVERFLOW REASONS

Reasons for purifier overflow

1. Incorrect purifier disc size [Inside diameter too large]
2. Too low fuel oil temperature
3. Too much rate of throughput 
4. Too much sludge inside the bowl
5. Low speed (rpm) of bowl rotation
6. Sealing water failure
7. Operating water failure
8. Worn out main sealing ring.

Important Note: 

surveyor will ask you the following cross questions

Q1. what is throughput? 

• ANS: Purifier feed (inlet)

Q2. what is the meaning of overflow?

ANS:

• Overflow means oil leaking to water side or water leaking to oil side due to failure of interface between these two liquids.

Q3.How will you come to know your purifier is overflowing when you are being in ECR?

ANS: 

1. Purifier abnormal alarm will come
2. Sludge tank high level alarm will come

Air compressor

Air compressor safeties 

1. Drain valve
2. Unloader 
3. Bursting disc
4. Fusible plug 
5. Relief valve 
6. L.O low pressure alarm and trip
7. L.O low level alarm (sump)
8. J.C.W high temperature alarm and trip
9. Jacket water no-flow trip 
10. High air temperature trip 
11. Motor overload trip  

{Note: if surveyor asking this question in oral exam, definitely he will ask what are alarms and what are trips separately}

MARPOL ANNEX 6 REGULATION FOR THE PREVENTION OF AIR POLLUTION

REGULATION FOR THE PREVENTION OF AIR POLLUTION.

APPLY TO 

•  ALL SHIPS 

CERTIFICATES 

• INTERNATIONAL AIR POLLUTION PREVENTION CERTIFICATE
• ENGINE INTERNATIONAL AIR POLLUTION PREVENTION CERTIFICATE.
• INTERNATIONAL ENERGY EFFICIENCY CERTIFICATE.

NITROGEN OXIDE (NOx)

APPLY TO 

•  EACH ENGINE OF 130KW AND ABOVE (MAIN ENGINE ND AUX ENGINE)

NOT APPLY TO 

• EMERGENCY GENERATOR,
• LIFE BOAT ENGINE

HOW NOX WILL PRODUCED?

•  USUALLY OXYGEN IS 21% IN AIR. AND NITROGEN IS 78% IN AIR . WHEN BOTH ARE REACT WITH TEMPERATURE OF 1100°C IT BECOME NOx WHICH IS HARM TO ENVIRONMENT.

REASON FOR NOx PRODUCTION.?

•  HIGHT CYLINDER TEMPERATURE AND PRESSURE DURING THE COMPRESSION.
• HEAVY LOAD ON ENGINE OR ENGINE UNIT.
• IMPROPER AOR AND FUEL MIXTURE.
• HIGH TEMPERATURE OF SCAVENGE AIR.
• JACKET WATER HIGH TEMPERATURE.

METHODS OF REDUCE NOx EMISSIONS?

• HUMIDITY AIR METHOD 
• EXHAUST GAS RECIRCULATION METHOD.
• WATER INJECTION AND WATER EMULSION.
• SELECTIVE CATALYTIC REDUCTION
• TWO STAGE TURBOCHARGER 

NOx TECHNICAL FILE ENTRIES .

• ANY MAJOR CHANGES ARE DONE IN IN ENGINE SHOULD BE WRITTEN IN NOX TECHNICAL FILE. 
• INJECTOR CHANGING/ OVERHAULING.
• INJECTOR TIMING CHANGE.
• CYLINDER COOLER REPLACE
• T/C CHANGES  OR REPLACED
• SCAVENGE AIR COOLER MAINTENANCE.
• GOVERNOR CHANGES IN SETTING.

SULPHUR OXIDES SOx 

APPLY TO 

• MAIN ENGINE, AUXILIARY ENGINE BOILER, INCUBATOR.

FORMATION OF SOx 

• BAD QUALITY OF FUEL 
• HIGH PERCENTAGE OF SULPHUR IN FUEL OIL 

CAUSES OF SOx 

• ACID RAIN 
• EMISSION OF SOx 
• HARMFUL TO HUMAN.

SULPHUR EMISSION REGULATIONS

• AFTER 2020 SHOULD USE BELOW 0.5% SULPHUR M/M 
• IF WE DONT HAVE BELOW 0.5% SULPHUR FUEL OIL .
• WE SHOULD FILL FUEL OIL NON AVAILABILITY RECORD 
• NEXT PORT THEY WILL ARRANGE THE LOW SULPHUR FUEL OIL.

REDUCTION OF SOx.

• BUNKER LOW SULPHUR FUEL OIL.
• EXHAUST GAS SCRUBBER TECHNOLOGY
• CYLINDER LUBRICATION -USE MORE ALKALINE LUB OIL.

SPECIAL AREA UNDER ANNEX 6

• BALTIC SEA 
• NORTH SEA AREA 
• NORTH AMERICAN SEA.
• UNITED STATES CARIBBEAN SEA AREA.