Thursday, May 3, 2012

ODMCS DECANTING OF ANNEX 1 SLOPS ON CHEMICAL TANKERS- CAPT AJIT VADAKAYIL


DECANTING ANNEX 1 SLOPS VIA ODMCS OUTSIDE MARPOL SPECIAL AREA-  CAPT AJIT VADAKAYIL

  

ODMCS operating procedures will vary from one make to another and the relevant operating manual should be readily available on board and be strictly observed.

This manual may run into a few hundred pages of superfluous information. The whole essence is in this post.


The equipment shall be used to monitor the discharge of Annex 1 slop tank decanting.


The equipment is designed to provide a continuous record of the discharge. This record must be identifiable as to time and date and shall be kept aboard for at least 3 years. Any failure of the equipment shall result in the immediate suspension of discharge operations  and a note made in the Oil Record Book.



Alternative manual procedures may allow the discharge to resume if the ODMCS cannot be immediately repaired but the defective unit must be made operable before the ship commences its next voyage unless arrangements have been made for repairs to be effected at the next port.



               ODMCS Tests


Check that the indicators and recording devices are operable and all calibrated correctly.

Test all audible and visual alarms. Follow the procedures detailed in the ship's "ODM & Control System Operations Manual".

Ensure there is aboard a sufficient supply of consumables for the recording device.



You cannot educt a dirty slop overboard, as bubbles will interfere with ODMCS.



TYPICAL OPERATING PROCEDURE:



In E/R:--

Open air to converting unit

Open FW to analyzing unit

Check oil levels of sample pump bulkhead seal

Check cleaning solution level

Put on the power supply to converting unit



On deck:

Open annex 1 manual overboard

Open manual slop dischg valve if any

Close all unnecessary valves

Shut annex 2 overboard



In Pumproom ( or space where analyzing unit is located ):

Open FW valve to sample pump

Open drain valve of analyzing unit

Shut drain after flushing sample pump

Open sample pump inlet outlet valves

Open analyzing unit inlet and outlet valves

On DPT open all 3 valves, then shut equalizer valve



In CCR:

On CPU select auto mode.

Set alarm limit to 1/30000

Set speed to GPS

IRD 30 litres / nm

Select sample point

Set dischg flow rate ( important to get this figure right )



litres / nmile= ppm X cum/hr

                      ---------------

                      knots X 1000



if the ODMCS slop dischg is taken to manifold Annex 1 line any cargo tank can be used as

slop.



SIMULATION TESTS:



First get familiar with the CPU controls. Only then you must proceed or you will falter in front of a port state inspector and ship will get a deficiency citation.



1) Set flow rate to 1000 cum/ hr , speed to 10 knots and ppm to 300 ( this corresponds to 30 litres per nm IRD ). The slop bypass is shut and overboard valve is open. When ppm setting is increases to 301 the overboard must shut and slop bypass open.



2)Reset total discharged quantity to zero. Set alarm point to a low 10 litres . The overboard must shut soon.



3)Shut off sample flow to analyzing unit to trigger the sample loss alarm. The overboard must shut and slop bypass open.



4) Put off the power supply.the power loss alarm will trigger. Overboard must shut and slop bypass open.



If ODME is not working the event and reason should be recorded in the ORB including  when it started working again along with the cause.



This equipment must never be by-passed when pumping out annex 1 washings or decanting slops. . The ODME printout must be referenced by date and time at the start and end of each decanting operation . The level of the oil/water interface should be established and the pump rpm progressively reduced as this point is reached to avoid oil being drawn into the suction. The discharge must be stopped before the oil content reaches the maximum permissible limit of 30 litres / nm.



Decanting operations must be limited to daylight hours and the overboard discharge must be constantly and visually monitored, as far as practicable.



Details must be entered in the Deck Oil Record Book.





ODMCS PRACTICAL OPERATION WITHOUT TEARS



CLEANTRACK 1000 -- BRANNSTROM SWEDEN— the MOST reliable and popular model at sea



NO ANNEX 1 SLOPS CAN BE DISCHARGED OVERBOARD UNLESS IT IS PASSED THROUGH THE ODMCS.  ODMCS IS DESIGNED TO KEEP A CONTINIOUS RECORD OF THE DISCHARGES. THE RECORD OF PAST 3 YEARS SHALL BE RETAINED FOR ANY SHORE INPECTOR TO EXAMINE. OUR SET DOES NOT HAVE A PRINTER –HOWEVER IT HAS A LARGE ELECTRONIC MEMORY.



OUR CLEAN TRACK 1000 ODMCS HAS A UNIQUE SELF CLEANING FEATURE WHICH MAKES MANUAL CLEANING UNNECCESARY— BUT IT CANNOT HANDLE HEAVY BLACK OIL AS THERE IS NO SOAP SOLUTION.



YOU CAN SELECT THE TYPE OF ANNEX 1 OIL OR SELECT THE DENSITY/ VISCOSITY/ POUR POINT FOR PRODUCTS—AS PER THE TABLE  OR FOR ANNEX 2 OILS. (2.2 ). LUB OIL IS TYPE 4---HFO IS TYPE 6---KEROSENE IS FOR JET FUEL ETC



AT THE BEGINNING OF THE NEW BALLAST VOYAGE CANCEL THE TOTAL AMOUNT OF OIL DISCHARGED DURING PREVIOUS VOYAGE  AND ENTER THE NEW LIMIT OF 1/30000 OF THE TOTAL QUANTITY OF THE PARTICULAR CARGO CONVERTED TO LITRES.



THERE IS A GPS INPUT INTO THE ODME. IF YOU PUT OFF THE GPS, IT SHOWS A GPS RECEIVER TIME OUT.



SO THE INPUTS TO THE FORMULA FOR IRD --MAX 30 LITRES / NM — LIKE PPM, CUM/HR, KNOTS ARE ALL ON AUTO. MANUAL OVERRIDE MUST BE USED ONLY IN EMERGENCY.



IRD IN LTRS/NM= PPM X CUM PER HOUR/ KNOTS X 1000.



LINES WITH ‘I’ ARE THE ONES WHICH WILL ALLOW MANUAL INPUTS.



CHIEF OFFICER MUST BE A WIZARD ON THE LCD INPUTS AND FUNCTION KEYS –OR YOU CUT A SORRY FIGURE IN FRONT OF A PORT STATE CONTROL INSPECTOR , WHO WILL NOW START EXPLOITING YOUR VULNERABILTY—AND THEN IF THE SHIP GETS A DEFICIENCY CITATION  YOU HAVE NOBODY TO BLAME BUT YOURSELF. 



THE MESSAGE IS-- BE VERY FAMILIAR WITH THE CPU FEED PAGES/LINES .  NOTHING BIG IN THIS--- STEP –INS—ALT—PUNCH NUMBER---RET—ARROW UP/ DOWN.



 AFTER INS IS PRESSED INFO ON LCD THAT CAN BE CHANGED WILL FLICKER. A CURSOR SHOWS THE POSITION WHERE THE NEXT CHARACTER WILL TURN UP.

  • AFTER INPUT PRESS RETURN TO ENTER OR ACCEPT THE DATA.
  • ALARM AND WARNING OUTPUTS ARE ACTIVATED WHILST THE RESET KEY IS ACTIVATED.
  • USE STEP TO CHANGE BETWEEN OPERATION MODES AUTO/ MANUAL.
  • AN INSERT KEY MUST PRECEDE CHARACTERS IN ORDER TO BE ACCEPTED.
  • ALT HAS TO BE PRESSED WHEN NUMBERS ARE KEYED IN.



ODME IS USED ONLY TO DECANT THE SLOPS. YOU CANNOT DECANT SLOPS IN SPECIAL AREAS OF ANNEX 1 , WHEN YOU ARE LESS THAN 50 NM FROM NEAREST LAND OR WHEN YOU ARE NOT ENROUTE.



THE OVERBOARD PNUEMATIC VALVE WILL SLAM SHUT IF THERE IS—

POWER FAILURE OR YOU PUT THE INSTRUMENT OFF

SAMPLE LOSS

SENSOR CAPACITY GETTING EXCEEDED

FAILURE OF MEASURING RECORDING SYSTEM.



THUMB RULE: IF THE OVERBOARD SLAMS SHUT FIRST REDUCE THE RATE –IT SHOULD NOW OPEN. IF NOT THEN ALLOW THE MIXTURE IN SLOP TANK TO SETTLE AND LATER DECANT AT A REDUCED FLOW RATE.



OPERATING PROCEDURE:



PUT ON THE POWER 440V FOR SAMPLE PP AND 220V FOR CPU.



ON DECK:



OPEN ANNEX 1 MANUAL OVERBOARD VALVE (USUALLY LOCKED ) ON PORT SIDE

SET THE LINE TO PUMP DECANTED SLOPS OVERBOARD USING FRAMO PUMP—DON’T START THE FRAMO PUMP YET.



SET THE LINE FOR SLOP TO RECEIVE ODME REJECTED CONTENTS. . THE PNUEMATIC VALVE IS ALWAYS OPEN IF THE PNUEMATIC OVERBOARD VALVE IS SHUT—THEY WORK IN TANDEM.



IN ENG ROOM:--



CHECK THE LEVEL OF LUB OIL (TURBINE OIL #90 ) ON TOP OF THE SAMPLING PUMP BULKHEAD SEAL.



OPEN AIR ( 4.7 TO 7 BARS RANGE ), FRESH WATER (4 KG )  VALVES IN THE ENGINE ROOM.  ALL VALVES ARE NUMBERED AND FLOW ARROW DIRECTIONS ARE MARKED PROPERLY.



IN TC PUMPROOM:



THE ANALYSING UNIT IS SITUATED IN THE PUMPROOM.



THE FRESH WATER VALVES MUST BE SHUT.. THEY ARE ONLY FOR FILLING UP THE LINES INITIALLY--  AFTER WHICH THE DRAIN OF THE AU MUST BE SHUT.



ON THE PNUEMATIC FLOW METER OPEN THE DPT VALVES ( 2NOS ) AND KEEP THE CENTRE EQUALISING VALVE SHUT. (1.4 KG AIR )



OPEN THE DECANTED SAMPLE INLET AND OUTLET VALVES.  OPEN THE AU DRAIN TILL THE WATER COMES OUT AND THEN SHUT IT.



IN THE CCR:



THE COMPUTER PROGRAMMING UNIT CPU IS SITUATED HERE.



FUNCTION KEYS:



INS/   INSERT ---TO PREPARE FOR SELECTION USING CURSOR to change inputs. Character writing 0 to 9 dot and dash , is accepted only after pressing.



HORIZONTAL ARROW/   TO MOVE THE CURSOR RIGHT OR LEFT.



VERTICAL ARROW/   TO MOVE THE LINE DOWN OR UP



RET/   ENTER KEY. Termination



CHR/   CHARACTERLESS KEY (OOPS !)—IT JUST MEANS IT DOES NOT HAVE A FUNCTION.



RESET/   TO STOP BUZZER  OR ERASE /RESET OLD ALARMS



ALT/   TO USE ALTERNATE FUNCTION –NUMBERS INPUT.



STEP/   TO SELECT OR TO CHANGE  A/M



PF/   PAPER FEED



AV/   ANALYSING VALVE—PRESS IT TO OPEN/ SHUT ( for manual cleaning of AU )



PG UP/   PAGE UP KEY



PG DN/   PAGE DOWN KEY



CLN/  SYSTEM FLUSHING START - STOP KEY



ODM/   ODME START STOP KEY



STV LAMP LIGHT/   SLOP TANK VALVE OPEN ( YOU CAN SEE POSITION OF OVERBOAD AND SLOP BYPASS VALVES ON THE LCD DIAGRAM )

OBV LAMP LIGHT/   OVERBOARD VALVE OPEN



MANUAL OVERRIDE KEY /   TO DO MANUAL OPERATIONS IN CASE OF FAILURE AND WHEN OVERBOARD DISCHARGE IS NECESSARY.



IMPORTANT:  KEEP THE FLOW RATE LOW AT 200 CUM/ HR. THE ODME IS ONLY TO DECANT—OUTSIDE SPL AREA, -NOT TO PUMP TANKWASHING STRIPPINGS DIRECTLY OVERBOARD.





PUT ON THE POWER OF THE CPU. THE PRINTER STARTS WORKING IMMEDIATELY. ENSURE THE PRINTER PAPER IS SUFFICIENT FOR THE WHOLE INTENDED OPERATION. RESET THE PRINTOUT COUNTER BY PRESSING RET.



PRESS MODE KEY TO CHOOSE OPERATOR MODE OR PRESS PAGE DOWN KEY TILL THE DISPLAY SHOWS PAGE PROGRAMMING.



ON LINE 2.1- SELECT SAMPLE POINT BY –

STEP— SELECT ( CHANGE )

INS  INSERT A VALUE

RET—ENTER



ON LINE 2.2--  SELECT CARGO TYPE SAY KEROSENE BY- ( Lub oil is oil type No4 )

INS

HORIZONTAL  ARROW-- TO SELECT ANOTHER TYPE SAY GASOLENE

RET-- ENTER



ON LINE 2.3 –USE ‘OIL DISCHG’ MODE OF 30 LITRES / NM FOR CCR CARGO USE . THE OTHER MODE OF “OIL CONC” IS FOR ENGINE ROOM BILGES USE OR FOR SBT—WE DO NOT USE THIS . USE STEP TO CHANGE.



ON LINE 2.4—THE FLOW IS ON AUTO. YOU CAN CHANGE WITH STEP TO MANUAL MODE OF CUM/ HR. WHEN YOU ENTER A MANUAL FLOW RATE, THE NUMBER WHICH SHOWS INSIDE BRACKETS IS THE AUTOMATICALLY RECD VALUE.





ON LINE 2.5--  THE SHIP SPEED IS ON AUTO. YOU CAN CHANGE WITH STEP TO MANUAL MODE OF KNOTS. THE NUMBER INSIDE BRACKET IS THE GPS VALUE.



ON LINE 2.6--  TOTAL QUANTITY OF OIL THAT HAS BEEN DISCHG + TOTAL QUANTITY OF OIL ALARM LIMIT ( WHICH IS TO BE ENTERED AT 1/ 30000 OF QUANTITY OF CARGO DISCHARGED ).   THE TOTAL AMOUNT OF OIL DISCHARGED IN LITRES OVERBOARD IN THE PREVIOUS VOYAGE CAN BE CANCELLED BY 00000  AND PRESSING RET KEY.  RESET IS ALLOWED ONLY AT THE BEGINNING OF A NEW BALLAST VOYAGE.



ADJUST WARNING LIMITS IN LINE 2.7.— YOU CAN CHOOSE A WARNING LIMIT OF SAY 25 LITRES PER NM –THIS ALLOWS YOU TO SLOW DOWN THE PUMP AND GET SOME MORE SLOP WATER UNDER THE OIL LAYER OUT.



ON LINE 4.1—INPUT THE MIN AND MAX FLOW RATES IN CUM/ HR. ON FAIRCHEM YUKA THE RATES ARE 50 AND 200 CUM /HR



NOW PRESS PAGE UP 3 TIMES AND COME TO –



LINE 1.2— ENSURE GPS IS ON AUTO BY USING STEP TO CHANGE



ON LINE 1.3--  KEEP THE OIL CONC IN AUTO MODE



NOW PRESS UP ARROW TWICE AND COME TO HEADLINE PAGE 1.1 –CHECK IF ALL ARE ON AUTO—

OC/ PPM

FLOW/ CUM/HR

LITRES/NM

SPD/ KNOTS

GPS/  AUTO

KEEP AN EYE ON THIS DISPLAY DURING DECANTING OPERATIONS.



IF YOU PUT THE GPS TO MANUAL IT IS ONLY FOR ONE HOUR—AFTER THAT IT WILL GO BACK TO AUTO.



NOW GO TO LINE 6.1 AND CHECK THE FW PRESSURE IN ANALYSING UNIT.  THE DISPLAY SHOULD BE CLOSE WATER WITH STEP ( IF THE WATER IS OPEN VIA SOLENOID VALVE ).  IF NOT THEN OPEN WATER WITH STEP. THE PRESSURE MUST SHOW 2 BARS MINIMUM.



BY PRESSING ODM KEY THE ODME STARTS.  THE FRAMO PUMPING RATE OR FLOW RATE IN CUM/ HR WILL BE DISPLAYED ON THE HEADLINE PAGE.



THE OBV KEY LED LIGHTS



THE OVERBOARD VALVE OPENS AFTER ONE MINUTE –THIS CAUSES THE OBV OPEN LIGHT TO COME ON AND SIMNULTANEOUSLY THE STV OPEN LIGHT GOES OFF.



FOR STOPPING ODME PRES OBV AGAIN.



NOW THEN OBV LED LIGHT GOES OFF AND THE LED ON THE CLN KEY COMES ON. IMMEDIATELY THE OVERBOARD SHUTS AND THE SLOP VALVE OPENS---OR OBV OPEN LED GOES OFF AND THE STV OPEN LED COMES ON.



THE SAMPLING LINE IS NOW FLUSHED FORWARD AND BACKWARDS 3 TIMES IN 2 MINUTES AND STOPS AUTOMATICALLY.  THEN THE CLN KEY LED GOES OFF.



PUT OFF THE FRAMO PUMP.



NOW GO AND SHUT ALL THE VALVES OF AIR, FW YOU OPENED IN E/R.



SHUT ALL THE VALVES YOU OPENED IN PUMPROOM. KEEP ONLY THE DPT EQUALISER VALVE ( MIDDLE ) OPEN.



SHUT OFF ALL VALVES ON DECK YOU OPENED..



SHUT OFF THE POWER TO THE CONVERTING UNIT IN E/R AND THE CPU IN CCR. IF THE CPU POWER IS ON AND THE CU POWER IS OFF THEN AN ALARM COMES—ALARM COMMUNICATION ERROR.



SIMULATION TESTS:-



YOU CAN DO ELECTRONIC SIMULATION BY ENTERING MANUAL PARAMETERS FOR SPEED, FLOW RATE AND PPM.   KEEP THE FLOW RATE AT 200 CUM/ HR.--  IF YOU GO AT HIGH OR VERY LOW RATES  THERE WILL BE ALARM.



REMEMBER THE OVERBOARD PNEUMATIC VALVE WILL OPEN—SO MAKE SURE THE MANUAL OVERBOARD VALVE IS SHUT TO AVOID POLLUTION.—AND MAKE SURE THIS LINE IS FILLED WITH WATER.



1) SET FLOW RATE TO THE 200 CUM/ HR.  SPEED TO 5 KNOTS AND THE PPM TO 350. THE IRD IS NOW 14 LITRES/ NM.  THE OVERBOARD IS OPEN AND THE SLOP BYPASS IS SHUT. NOW INCREASE THE PPM MANUALLY TO 650 PPM WHICH MAKES THE IRD 26 LITRES/ NM—THERE WILL BE A WARNING ALARM.  NOW INCREASE THE PPM TO 800 PPM TO GET 32 LITRES/NM. . THE OVERBOARD WILL NOW SLAM SHUT.



2) RESET THE “TOTAL OIL DISCHARGED QUANTITY” TO ZERO. NOW SET THE ALARM POINT TO A LOW 10 LITRES. THE OVERBOARD WILL SHUT SOON.



3) SHUT OFF THE SAMPLE FLOW TO AU TO TRIGGER SAMPLE LOSS ALARM. THE OVERBOARD WILL SHUT AND SLOP VALVE WILL OPEN.



4) PUT OFF THE POWER SUPPLY. THE POWER LOSS ALARM WILL TRIGGER. OVERBOARD WILL SHUT AND SLOP BYPASS WILL OPEN.



ODMCS prints every 10 min – also when alarm conditions develop, when normal conditions are restored, when the computed rate of discharge varies by 10 litres a nautical mile, when the command is manual and when the dischg overboard starts and stops.



Discharge automatically stops -- when there is power failure , loss of sample, at 1/30000 DWT ( cargo discharged ) ,  when IRD is greater than 30 litres / nm., failure of measuring or recording system and if input of any sensor exceeds the effective capacity of the system.



Sample flow rate is 900 litres/ hr upto 65 deg c.  Cleaning solution consumption 100 litres / hr



MAINTENANCE:



AN ODME TECHNICIAN COSTS MONEY.   IF YOU DO YOUR JOB AND KNOW WHAT IT TAKES TO RUN A TROUBLE FREE ODME, WE CAN KEEP THE TECHNICIAN AWAY.



THE IR DETECTOR LINE 5.4 HAS 4 VALUES IN %.  WITH A DIRTY MEASURING CELL THE FIRST VALUE WILL DROP <85 % AND THE OTHER THREE WILL RISE >50%.  -THE FIRST VALUE (CLEANING LIMIT ) IS THE DIRECTLY TRANSMITTED LIGHT SIGNAL THROUGH THE SENSOR GLASS TUBE. IF THE SENSOR TUBE IS DIRTY THIS VALUE BECOMES LOW.   2 3 AND 4 ARE CAUSED DUE TO AIR BUBBLES AND PARTICLES IN FW—THESE CLEANING LIMITS MUST BE LOWER THAN 10%  SYSTEM CLEANING IS ACTIVATED IMMEDIATELY AND AUTOMATICALLY AFTER THE ALARM. IF THIS IS NOT ENOUGH YOU CAN PRESS CLN KEY AND CARRY OUT FURTHER MANUAL CLEANING.  IF STILL THERE IS NO IMPROVEMENT OPEN THE ANALYSING VALVE BY PRESSING AV KEY. SHUT THE VALVE AT THE OUTLET OF AU. OPEN THE TOP PLUG AND USE THE LONG BRUSH IN THE TOOL BOX WITH CLEANING SOLUTION FOR SCRUBBING..



PRECAUTIONS:

IN COLD WEATHER DO NOT ALLOW FW TO FREEZE AND BREAK THE ODME.



NOTES:

* IF THE ALARM LIGHT FLICKERS IT MEANS THERE IS MORE THAN ONE ALARM.

* THE SAMPLE WATER FLOW IS 900 LITRES PER HOUR

* FW CONSUMPTION IS 60 LTRS / HR DURING MEASURING AND 600 LTRS / HR DURING CLEANING

* MANUAL FLOW CAN BE PROGRAMMED FOR SIMULATION

* SCROLLING FAST –SCROLL+ ALT

* PF LED LIGHTS INTERMITTENTLY WHEN THE SYSTEM IS IN MANUAL OIL CONC MODE.

* AV FOR MANUAL CLEANING OF ANALYSING UNIT.

* YOU CAN STOP AFTER CLEANING BY PRESSING CLN KEY—NOT A WISE THING TO DO.

* CLEANING ERROR CAN  BE CAUSED BY TEMPORARY TEST ( TOO SMALL HOSE PIPE CONNECTED TO SLOP LINE ) INSTEAD OF RUNNING THE HUGE SLOP PUMP OR EVEN A LEAKY ANALYSING VALVE OR LOW AIR PRESSURE WHICH CAUSE THE AV TO OPERATE SLOWLY..





CAPT VADAKAYIL - 29 YEARS IN COMMAND


4 comments:

  1. hi yagya,

    make an entry in the annex 1 ORB , and you can use the ODMCS manually-- by opening the overboard valve .

    it must be repaired before the next ODMCS decanting.

    capt ajit vadakayil
    ..

    ReplyDelete
  2. This blog is nice.Honeywell is a Fortune 100 diversified technology and manufacturing leader, serving customers worldwide with aerospace products and services, control technologies for buildings, homes and industry, automotive products; turbochargers and specialty materials.Slam Shut Off valves.

    ReplyDelete
  3. Sir I have a doubt, can you please explain that why continous sampling takes place in the ODMCS when there is no PPM criteria for oil to be discharged with ODMCS.
    Thanx in advance

    ReplyDelete
    Replies
    1. hi r,

      to find litres/ n mile you need to know ppm .

      also ODMCS shuts the overboard automatically if the ppm exceeds a certain high value-- as ships have a limited speed ( even if it is very fast ).

      capt ajit vadakayil
      ..
      .

      Delete