Wednesday, July 27, 2011

THE NAIVE SAILOR- SCAVENGE AIR CONDENSATION - MARINE MAIN ENGINES-- CAPT AJIT VADAKAYIL

video


A03153  Sat, 4 Jun XXX 14:54
From: XXX MASTER
To  :XXX TECH2  XXX                       Sent    6/3/XXX 1:56 AM
Date: Friday, June 03, XXX 12:53 AM Msg: A03153-54548

Path: \MASTER\SentBox@@@@@@@@\XXX
Sub : XXX/ Fw: Notice of newly issued "HSD-B11103" For HITACHI- MAN B&W Diesel Engines
Attach: HSD-B11103E .pdf        scav air water condensation.pdf

chengr will give a reply-- 
this long email will make REAL engineers drool and fitter types mad --

dear XXX,

when XXX brains trust give fancy coloured graphs -- thumb rule: dont
trust it.

to read more about such stupid XXX graphs punch into google search
THE NAIVE SAILOR GPS -VADAKAYIL

let us imagine a scenario on north contender doing a voyage from
lae to madang at hot ambient temp 35 deg c and relative humidity
 99% with heavy intermittent rain. the dew point should be 34.8 deg c.

will the mist catcher be able to remove all the water inherent in the
air released by the air compresssor side of the turbocharger?

absolutely not--

in fact if you look into the sight glass of the mist catcher it will
be continious flow like a open tap.

about 40% of the 4 tons of water ( surprised- right? )will evade
the undercapacity water mist catcher and find its way to the
scavenge air receiver-- where it will condense again.

of course there are drains to remove it ( see attachment of XXX
arrangement ) -- but these drains can get choked with sludge.
the condensed water from SAR/ underpiston goes directly into
 the scav drain tank , which does NOT have a HL alarm --

and engineers may never get to know is the drain is choked. all
must know how to do THERMO CHECK at this drain using the fingers.

-- so far i have never seen a PMS which gives an iota of importance
to the all  important scavenge drains . it deserves an check/ overhaul
every month.

-- and then the scavenge air receiver and the underpiston space become
swimming pools--from where water will be churned into the cylinders
with every blast before and after BDC via scavenge ports.

THIS WILL SHATTER THE PISTON RINGS.

in such a case it pays to increase the scav air temp to 48 deg c ( not
more ).

XXX should not worry about sulphurous acid-- this can come only if
the sulphur content is high.

our santos bunkers have 0.5% sulphur. in any case this acid serves to
 clean the keechad from liner honed grooves, which act as reservoirs
 for the mecyl..

as of today now we need to clean our aircooler ( 52 deg c ) - anything
more than 48 deg c and the main engine loses power.

in the april XXX meet 2nd engr XXX said that " the ME air cooler
covers are holed " . 

there are special apexior coating available in the market to prevent
end cast iron covers of coolers geting holed by galvanic action/ or by
getting cavitation eroded.

now about adjusting the scavenge air temperature like the XXX want--
when i went to XXX for taking delivery of XXX-- from the
hotel XXX i shot off a email to tech dept from my private yahoo
email .

that you should make a tech superintendents standing instructions
for this new ship,  of which this particular one must be
highlighted--


QUOTE: MAIN ENGINE SCAVENE AIR TEMPERATURE
MUST BE ADJUSTED WITH SEA WATER OUTLET VALVE--
THE INLET VALVE MUST BE 100% OPEN: UNQUOTE

as soon as capt vadakayil signs off from a ship --  all revert back to
adjusting coolers with INLET sea water valves. old habits die hard!

it is so dang easy to find the "tell tale history" -- as in this case
only the top inlet cooler tubes get choked. 

water has this fantastic heat absorbsion/ dissipation capabilty if
the inlet valve is 100% open and return valve is throttled-- which
keeps 100% tubes chock-a-block with water.

this is this theoretical reason which enabled me to catch the
engineers happily pumping out XXX via the XXX into the
deck fire line into theanchor hawse pipe -- XXX.  OWS was
used rarely in XXX ( XXX failed the vetting on XXX )-- this
could mean only one thing , right?

-- corrosion of air cooler fins means poor cooling -- most corrosion
 of air cooler fins takes place , due to running sea water when ship is
alongside and stopped.

-- all STEAM connections to scav drains must be blanked. steam
rises --water falls.

-- modern theories are changing -- NOx is reduced by water mist.

bottom para:

it is common place to see engineers struggling over white hard scale
choked salt water cooler tubes --on all ships--all over this planet-.

this is like hitting your own feet with a hammer and then doing self
medication.

let us examine a simple tank cleaning heater in the ballast pumproom.
it has a shell which contains steam and there are finned tubes inside
containing flowing salt water, which has to be heated.

after the operations , the salt water inside the tubes is replaced by
fresh water-- OR blown with steam and drained.

is there any way the tubes can get choked with scale? -- pray?

never!

now let us imagine a useless chief officer in charge of operations.

after the use of tankcleaning heater , till the next opeartion -- say
after 3 months, the salt water remains in the tubes.

 a leaky steam inlet valve means these tubes containing stagnant
salt water is geting heated from outside .

the next operation --the tankcleaning heater will NOT perform.
when the heater is opened out the tubes will be choked with hard
 white scale.

SAF-ACID LEKHE AAO!  PHATAPHAT!! -- same sad story,
again and again and again --

brgds
capt ajit vadakayil
master
mt XXX
" to extract the best from your team, get 'em emotionally involved "
-----------------------------------------------------

-----
From: Technical Team 2 XXXX Ship Management

Date: Thu, 2 Jun 2011 13:41 +0100 Msg: AMOS-324791481

Subject: Notice of newly issued "HSD-B11103" For HITACHI- MAN B&W Diesel

Engines

To: XXX - MASTER
To: XXX - MASTER
To: XXX - MASTER

Cc: Technical Team 2 XXX Ship Management

Good day Captain / Chief Engineer,

This SL on scavenge air condensation handling to minimise carry
over is important; revert back on the status

Kind Regards,
XXX




-----Original Message-----
From:XXX [mailto:  XXX@hitachizosen.co.jp]
Sent: Thursday, June 02, XXX 3:22 PM


Subject: Notice of newly issued "HSD-B11103" For HITACHI- MAN B&W Diesel Engines


We are please to inform you of the following service data is newly issued
HSD-B11103 for HITACHI-MAN B&W Diesel Engines and alsoavailable
on our web site.

Please visit:

Home page address : http://hzds.aska.or.jp

User name : XXX
Password : XXX

XXX, XXX of Service department Hitachi Zosen Corporation, Diesel Engine Unit.
7-89,NANKO-KITA 1-CHOME,
SUMINOE-KU,OSAKA 559-8559, JAPAN



CAPT AJIT VADAKAYIL
29 years in command

4 comments:

  1. beautifully written !!!
    the read was highly gripping and i'm glad things has been spoken out frank.

    i was actually searching for some info regarding scavenge air, and found this page of yours ,

    HIGHLY INFORMATIVE

    keep it coming sir !

    best regards
    Gokul

    ReplyDelete
  2. Capt. Ajit Vadakayil
    October 15, 2014 at 7:00 PM
    STOP PRESS:

    I AM WRITING THIS AS I PROMISED ONE OF MY READERS 45 MINUTES AGO-- HE RAN UP TO ME DURING MY MORNING WALK--

    HE WANTED TO KNOW OUT OF MY 300 PLUS SCOOPS IN MY NEARLY 845 ODD POSTS--WHICH IS NO 1 AND WHICH IS NUMBER 300.

    ############

    well let me make it clear , these 300 scoops are CONSTRUCTIVE SCOOPS .

    all these 300 scoops are in the plane of INVENTION and NOT innovation.

    none of these 300 scoops are DESTRUCTIVE -- so my posts proving that edison, newton, darwin, einstein etc are IDIOTS does not find a place in these scoops.

    so waht could be the no 1 scoop?

    it is about providing a HINT on how to make a astronaut hibernate while travelling to mars -to cut down on food and water .

    it is about keeping alive a seriously wounded soldier till he can find proper medical care.

    punch into Google search-
    HIBERNATION WITH HYDROGEN SULPHIDE GAS VADAKAYIL

    and

    FUMAROLES FOR FREE ENERGY AND HYDROGEN SULPHIDE SUICIDES IN JAPAN VADAKAYIL


    one of my russian chief engineers who lived near siberia , a place infested with HUGE bears had once woken up a bear while on hibernation in a cave ( as a child ) and he told be how furious the animal was. Before they go into months of hibernation they would kill a large animal ( bury the dead animal it in the ground ) and would NOT eat it unless it became putrid , reeking of rotten eggs..

    WELL WHAT WOULD BE NO 300 RANK.

    it is about PIN WORMS on as$hole.

    Check out the comment dated 18th Dec 2013 , about surcharging the anus with oxygen 5 times a day to prevent pinworms disrupting your REM sleep. This is a 6000 year old Ayurvedic cure for pinworm which happens when you eat non-veg heavy meats and do NOT wash your as$hole after a crap.
    Punch into Google search-
    VEDIC PRACTISES IN MECCA VADAKAYIL

    If I were a white JEW, I would have been an international celebrity. but then who cares?

    I have reached a stage where ONLY I can evaluate myself--

    one of my DUTCH bosses tried to patronise me nearly 2 decades ago -- he said he has given me a good confidential service report-

    so i told him something in Hindi -- with its translation.

    VADAKAYIL KHUD QUESTION PAPER SET KARTA HAI !

    VADAKAYIL KUD EXAM LIKTHA HAI !!

    VADAKAYIL KHUD NUMBER DETA HAI !!!

    capt ajit vadakayil sets his own exam question paper, he writes the exam , and then he gives himself the marks .

    THIS IS THE MEANING OF LIBERATION.

    believe me -- that man hugged me ( NO patronising here ) and said -- he expected such an frank retort from me .

    he said- every other captain would have said thank you .

    he was told to enter into this dialogue by the single man owner of that shipping company . this was about my " CUT THE CRAP " EMAILS -- where i would point out that the EMPEROR IS NAKED .

    99% of the people will NOT even understand the wisdom and gravity of the statement above.

    capt ajit vadakayil
    ..

    ReplyDelete

  3. Your blog provided us with valuable information to work with. Thanks a lot for sharing. Keep blogging.
    amazon shopping deals    

    ReplyDelete
  4. Hey capt. Ajit. I am a mechatronics student researching about scavenge air, especially water content in scavenge air, current methods of controlling the water content, etc. Would it be possible to share some of your knowledge from many years of experience by e-mail ? I have many questions and curiosities that no one seems to know how to answer. Maybe you can help me out. Thank you very much. Andrei

    ReplyDelete