Wednesday, November 28, 2012

PRESSURE VESSEL PERMIT TO WORK ON CHEMICAL TANKERS- CAPT AJIT VADAKAYIL




PRESSURE VESSEL PERMIT TO WORK ON CHEMICAL TANKERS- CAPT AJIT VADAKAYIL


PRESSURE MUST ALWAYS BE EXPECTED INSIDE A CHEMICAL TANKERS CARGO PIPELINES  CONTAINING TOXIC, CARCINOGENIC, BIOACCUMULATIVE, CORROSIVE OR HEATED CHEMICALS -- 

-- WHICH CAN SCALD, KILL , MAIM INSTANTLY OR AFFECT YOUR FUTURE GENERATIONS WITH GROSS MORPHOLOGICAL ABNORMALITIES SUCH AS CLEFT LIP.


It is usual on parcel chemical tankers to introduce air or nitrogen at 7 kg pressure into pipelines to blow the stack or clear the line. Imagine a slug of free flowing dangerous cargo like Sulphuric acid being projected through a pipe by compressed air of 7 kg which you deliberately introduce into the pipelines at stripping time. It will smash into all corners like a bullet. 


Vapour lock means boiling in cargo lines due to excessive VP . Do not open any pipeline without depressurizing it first on a chemical tanker.

Crew must be aware of the direction of wind by looking at the anemometer fan on the mast when releasing the pressure.

All must be familiar with eye wash and shower arrangements. Goggles  of the appropriate type and as required are to be worn on top of hardhats by deck crew to be used when required at an instant notice.

When loading Carcinogenic, Toxic or Bioaccumulative cargoes, ascertain the TLV-TWA . The  Vervey’s  tankcleaning  guide  gives  the  VP/TLV  ratio---  anything  more  than  one  is  dangerous requiring the use of Draeger tubes on deck and great care while opening out blanks and spools at manifold.  Epichlorohydrin is 17, Methanol is 0.46 (200/92).

Filter protection must only be used against gases which has a distinctive smell and there is no lack of oxygen. If you can smell gas it means the filter is saturated and is to be discarded.
Class 1/ 1000ppm
Class2/ 5000 ppm
Mark X/ low BP products


Those not actually involved in a job should still be aware of what is happening, so that they may avoid putting themselves at risk or interfere with an unsafe act before it is too late. All  should care for their own health and safety and for their shipmates.

Gas suits have resistance tables Viton/ Chloroprene rubber/ PVC. Positive pressure inside the suits  add to safety.

Splash suits –for protection against liquid splashes –polyamide fabric coated both sides with PVC. Hood with draw string to fit under the helmet. Front  zipper must be protected by double fly
front.

A PVP Permit must be issued for all maintenance and repairs to pressure vessels, bolted plates, manhole covers and pipelines used for pressurized or hot liquids, gases and vapours, e.g. cargo/fuel oil, hydraulic systems, water, compressed air, steam lines, etc.

A PVP Permit must also be issued where work on a pressure vessel or pipeline system may result in a potential risk from the above to cause:
-- Injuries to personnel,
-- Release of a pollutant to air or the sea or on deck,
-- Uncontrolled sea water ingress in the machinery or other  spaces.


PVP Permits must be issued in conjunction with " DO NOT OPERATE" tags.

Prior to commencing work all valves or cocks used to vent or drain the pressure vessel or pipeline system must be OPEN and secured; all valves or cocks used to isolate the pressure vessel or pipeline system must be CLOSED and secured.

All such valves, cocks and the associated machinery/equipment must be tagged with "Do Not Operate" tags. Details of the tagged valves should be listed on the Permit or a Tag Out/Lock Out Record.

The "Do Not Operate" tags must contain the following information:
-- The name and/or rank of the person placing the tag. This person is the only person who can remove or authorise the removal of such tags, unless a senior officer, authorises the removal. In such an event this Senior Officer must ensure that all work has been completed and/or that it is safe to return the system to use. 
-- The date and time that the tag was placed.
-- The PVP Permit identity number relating to the tag out.

Where a PVP Work Permit is issued for pipelines which are connected to equipment that is mechanically operated, but electrically driven, it must be ensured that the driving equipment is electrically isolated. The circuit breakers or switches must be locked out, and "Do Not Operate" tags applied, and an  Electrical Work Permit (EWP) issued.

These "Do Not Operate" tags should state the PVP identity number, name and/or rank of the officer posting the tag, date and time of posting.

The "Do Not Operate" tags must be completed using a non erasable ink, i.e. felt or fibre tip marker. They are of the "use once only" type.

A PVP Work Permit must be issued for each individual job.


Where more than one job is carried out on the same pressure vessel or pipeline system, a Permit is required for each job. However only one tag need be used, provided that all Permit identity numbers applicable to that pressure vessel or pipeline system, are recorded on the tag and the same person is carrying out all the work. Should different persons be carrying out work on the same pressure vessel or pipeline system then a tag is to be placed by each person

Note: The validity of this Permit is usually only for the working day. If extended or continuous work (24 hour) is to be carried out, the Permit should be cancelled and re-issued at the time of a change of shifts.

A PVP Work Permit must be authorised by a senior officer,  in respect of all relevant work carried out in the machinery spaces, accommodation spaces, store spaces or on deck by any personnel, including outside contractors.

It is the responsibility of the Permit Authoriser to ensure that the pressure vessel or pipeline system to which the Permit refers, is correctly isolated and drained or vented. The Permit Authoriser must ensure that all "Do Not Operate" tags are in position before work commences, and should be in attendance as work commences to ensure that the correct pressure vessel or pipeline system is being worked on.

The Permit Authoriser must regularly monitor the work progress to ensure that all isolation/safety requirements contained in the Permit are being adhered to.


A PVP Work Permit need not be issued for work undertaken during major repair periods with the machinery plant shut down. However, it is the responsibility of the Chief Engineer or Permit Authoriser, to ensure that all pressure vessels and pipeline systems that are to be worked on, have been completely drained/vented, cooled down and are safe to work on.

Although a pressure vessel or pipeline system may appear to be isolated and drained/vented, it is possible for valves to leak and vents or drains to be blocked. Personnel working on the pressure vessel or pipeline system, and the Permit Authoriser, must be aware of this and ensure that great caution is exercised when removing pipes, valves, covers, etc. as follows:-


--Never remove all the securing bolts at once before loosening a flange or cover.

--Always ease back the bolts and ensure that the flange or cover is free and there is no pressure behind it before removing the bolts or fixing clamp.

--Personnel must be aware of the potential danger from accumulated hot liquids or hot vapours being released from opened pipes or pressure vessels due to leaking valves.


CAPT AJIT VADAKAYIL
..

11 comments:

  1. When Singh asked her if she would like her children to be in politics some day, Sonia had apparently responded "I would rather my children begged in the streets than went into politics."

    OMG.. Sonia ney phir se hadh paar kar diya...

    Sir please look into it once.. How these stooges are in the back bush making the raul vinci(aka rahul gandhi), as if we would have missed him as a PM.. if sonia would have stopped the entry of raul in politics...

    http://ibnlive.in.com/news/tavleen-singhs-durbar-sonia-said-she-would-rather-see-her-kids-beg-than-enter-politics/307958-40-103.html


    Sir can you dedicate a post on Bhagat Singh? and how he was killed by the britishers as there are many gossips that he was gun down rather hanged? and Chandrashekar azad-the Behrupia..

    ReplyDelete
  2. hi mahaishwar,

    Periyar E.V. Ramasami wrote as an editorial in his Tamil Weekly Kudi Arasu dated 29th March 1931 that Gandhi gave a speech ( which he heard, along with thousands ) , that all Indians must call Viceroy Lord Irwin as "Mahatma Irwing".

    This was in response to Irving declaring that Gandhi is a divine saint.

    In the same speech Gandhi has said clearly and openly admitted that the reason for starting the Salt Satyagraha agitation had been to spoil and undo the work done by persons like Bhagat Singh.

    Gandhi was in favour of Bhagat Singh hanging.

    The British shot him, before the date of hanging.

    considering that a crowd keeping vigil outside the jail, they British made a hole in the wall behind the jail, cut his bullet ridden body ( shot as personal revenge by saunders ) into pieces -- and burned part of him in "kerosene", which is never done in Sikhism.

    he was NOT given a proper cremation and his skull is still missing. Later the people found some of his bones .

    capt ajit vadakayil
    ..

    ReplyDelete
  3. pressure build up too led to Bhopal! isn't it.UC guys had rusted MEC cylinders

    ReplyDelete
    Replies
    1. hi hari,

      the bhopal leak was MDI --a deadly cyanide poison.

      check out all the old indian and foreign newspapers, magazines -- incl TV video clips.

      ALL OF THEM LIED --THEY WERE FORCED TO BY UCC'S INFLUENCE ON THE MEDIA GIANTS--

      ALL OF THEM SAID THAT THE GAS WAS CHLORINE.

      this big WHITE lie is the reason why too many indians died-- as nobody got the proper first aid.

      i am an MDI expert.

      punch into google search-

      MDI DIPHENYLMETHANE DIISOCYANATE , BHOPAL KILLER GAS- VADAKAYIL.

      and we still have not got anderson.

      some vikram buddi wrote some hate thing on internet and he has been in US jail for so long.

      he did not shoot, he did NOT plan to buy a gun, he did NOT have any base , he was NOT a leader of a gang -- he was just a math student cum teacher.

      if black students write hate speech ( THAT JEW BROKE MY NOSE, IS HATE SPEECH ) he is a terrorist.

      if it is a white student , caught stalking with with a gun out ofwhich he has firedmany rounds -- he was mentally disturbed.

      we live in such a world.

      capt ajit vadakayil
      ..

      Delete
    2. so MDI is not MIC?but these days we are 'told' it was MIC which was first confused for ammonia.
      I thought i should ask this to you because you are the chemist or kaviraj here.
      If you have time why don't you do some high class hindu chemistry of Rasa.your current knowledge & those from scriptures might do wonders.& south india protected by mlechh invasion by vindhya mountains still has lots of palm leaf books on ancient sciences.You may like kaviraj Bhoodeb Mookherji here http://www.scribd.com/doc/105281319/Rasa-Jala-Nidhi-Vol-1

      you will understand things like Attributes of MercuryMercurial Operations-(1) Purification of Mercury(2) Boiling(3) Rubbing(4) Raising(5) SublimationUpward sublimation of MercuryDownward sublimation(6) Confinement(7) Restraint(8) Stimulation(9) RehabilitationEasy process of absolute purification of mercury(10) Swallowing of metals by mercury(11) Swooning of Mercury(12) Movement(13) Internal Liquefaction of mercury(14) Exhaustion(15) Killing(16) IncinerationChapter 4(17) Dyeing of mercury(18) Transformation of base metals into gold by mercury more!!!

      Delete
  4. An awesome post this. Really great. Everything in this post is simply awesome. It's truly good. WOW! Reaction Kettles || Process Piping || Site Fabrication

    ReplyDelete
  5. Nice post! I have bookmarked your blog for the future references.
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    ReplyDelete
  6. Hello Capt,

    Happy Independence Day tomo. I don't know how to write this. I think my father is seeing some woman. There may be more than one I really don't know.

    Once I saw some sent texts of his where he was talking about friendship....benign so we laughed it off.

    Recently I read his whatsapp messages (I play fames on his phone so sort of check it out) where he was talking about meeting in the club and enjoying some feeling. Really, I was shaken and disgusted. I confronted him as I have a way to talk to him you know. First he told some other story, how she's his friend's daughter. Now he's made up a new one, that someone else, won't say who, sent the messages from his phone. And today, he swore on God.

    Really I don't know how he even manages it since my Dad and I spend almost all our free time together, playing sports, trekking, driving. I once told you about my mother and her mental problems. They had gotten much better last year after we went to Hemkunt Sahib and Shri Badrinath. But then had relapsed.

    However, recently we went to many places in the south including Kerala and Rameswaram (Kerala is definitely something else, also Sucheendran Temple priest told us that Kanyakumari was indeed part of Kerala before that's why they have Kerala style of worship. Kerala temples have really amazing energy truly even though we didn't visit any of the major ones. Astounding places. )
    Anyway, she's gone through a complete transformation. I don't know if it was the positive energies, the sea or the pilgrimages. Hope she won't relapse this time. She went off her meds 3-4 yrs ago and we bore the trauma for the sake of her not suffering from any side effects of the meds in the future.

    Sorry for this long essay but what I wanted to say is that because my mother was the way she was I recall that they didn't sleep in the same room since I was probably 7 yrs or so.In fact, he never talked to her either and only started now when we started living apart from my uncle, his elder brother but that's another story.
    Is it that man must have his fix or whatever. I don't care what he or they might have done when I was little. But it's really frikking now especially since the woman seems maybe just a decade older than me. She had a whatsapp pic.

    Really don't know what to do. I keep forgiving him but then again I feel inflamed especially when I saw more calls and whatsapp messages again. He deleted Whatsapp but what if he still calls? I didn't tell my mother or brother anything.

    ReplyDelete
    Replies
    1. hi s,

      CONVEY TO YOUR FATHER , THAT HE WILL BE THE LOSER IF HE CREATES A SCANDAL

      THERE ARE MANY IMMORAL WOMEN OUT THERE WHO WILL DO ANYTHING FOR GIFTS AND MONEY

      capt ajit vadakayil
      ..

      Delete
    2. Thank you for the reply Capt. I will try it again. But really, who knows what he does outside the house. Yes, for sure there are women like that.

      Delete
  7. My father was married once before and had a daughter who was adopted by my uncle and treated harshly by his own kids. Father never supported her instead encouraged those ungrateful creeps and took care of them when evil Uncle was in jail for a long time, foregoing the plum positions he was offered at his uni and BSF. Today they've kicked him in the teeth while his first daughter hates him. She was presented as a cousin to us to and I found out much later why her alleged mother treated her like a step daughter.

    ReplyDelete