LPG Reliquifaction Cycle - Basic Principle

#SAILORVIKAS #LPG #RELIQUIFACTIONCYCLE #EXPANSIONVALVE
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[@capt.mdmuradhossain7800]

Very smooth lecture, I do appreciate! Keep it up. Brgds. Capt. Murad. Beaching Master/ Mooring Master. Chittagong, Bangladesh.

[@SailorVikas]

Thanks a lot capt !!!🙂

[@runedahl1477]

This presentation is simplified. The compressor will suck vapor from the tank at a fairly low pressure. When the gas is compressed the temperature of it will increase as will the pressure. There is always a connection between temperature and pressure. ( See Molidiare diagram) The temperature and pressure will variate depending what gas you are working with. The temperature of say propane would be around 120 degrees centigrade. To lower the suction temperature on the second stage the gas will pass through a intercooler. This one is partly fill with liquid cargo. The gas then passes through the second and possible third stage before it goes into the condenser. The pressure will now be fairly high so it becomes liquid. Heat is then removed with seawater, Freon or possible propane. Propane will have a pressure of about 12 bar at 30 degrees to remain liquid. When the cargo is sent back to the tank through a reduction valve the pressure as well as the temperature drops and the cold fluid goes back to the tank. Minus 42 degrees for propane. The two chemical gases butadiene and vinyl chloride monomer (VCM) will only go through a one stage compressor. For these the temperature most not go above 90 degrees for VCM and 60 degrees for butadiene. If that happens they will polymerase and become rubber component.

[@srampal123]

It's made difficult and complicated to understand, and always makes an explanation easy simple

[@kulwindersingh703]

very well and simplifies way of explanation good lecture sir

[@vinodraghavan7478]

At around 7:00 min u say that vapour will pass through expansion valve which is not correct fact which is happening there. Also technically its not an expansion valve,its a level controller.The expansion happens because the valve opens to control the level of the liquid in the receiver. An expansion valve is one which opens up for doing expansion like in the case of an AC or a refrigeration plant. But i appreciate ur efforts in trying to make others understand the concept. Please continue ur good work. We need more engineers in the market who are conceptually correct in LPG reliquefaction plants.

[@anshulsawlani4033]

Very good explanation..thank you

[@SailorVikas]

❤️

[@navaneethkrishnaj6294]

What do you do if the relquefaction plant is stopped in the middle of voyage

[@SailorVikas]

Stopped as in malfunction??

[@vimalmak4964]

Well I Appreciate your description. It's very simple😊. Keep it up. Can you please describe regarding single and different stages with compressor with different cargoes.

[@Kari_bhai]

Thanks a lot

[@AnubhavSingh259]

Good explanation but could have been little clearer . Thank you anyways

[@wildatheart7575]

I agree mostly except the expension valve. Due to expansion the liquid cooled down, This I agree, however and expending liquid should have HIGHER pressure (Bernoulli's equation). Anyway, you are doing an amazing job and do correct me if I am wrong.

[@SailorVikas]

Liquid entering in narrow pipe leads to Higher pressure. Liquid exiting from pipe which is getting broader, thus pressure reduces.

[@dexcal8009]

can you post a video about semi ref or full ref plant

[@thesailorfromindia1218]

Well describe sir

[@SailorVikas]

Thanks

[@gauravmishra8579]

hello sir. good day. Please tell the name of the book. It will be very helpful

[@SailorVikas]

Liguified gas handling principles by McGuire and White ( Its Old version not LGHP 4 )

[@comedygags6124]

thanks brother

[@SailorVikas]

Welcome ☺️

[@rohitjadhav4529]

That was good explanation Sir 👍👍

[@SailorVikas]

Thanks

[@apurvrana8365]

Sir lpg tanker sailing experienced sailor can join LNG carrier.....basics is same???

[@vikasvlogsss]

Yes can join

[@aneeshkurian7766]

Hello , i have a doubt how butane and propane is cooled to different temperatures in compressor . what the settings to get -5 and -43 respectively ?

[@SailorVikas]

If you are loading butane, you will receive a cargo with a temperature declared by shipper, let say it's 1 degree so even if u try to cool it further it won't cool after certain temperature because of its ingredients ...because it's not always pure butane....there are other gases mixed in it which you will find in inspection report after cargo sampling....if butane is getting cooled more than normal (-2 degree) than it has Ingredients of propane and other cargo mixed in it which leads to more cooling. Same goes with propane...if it's getting more cooled than normal (-42 degree) that is coz of its ingredients present in it. Talking about settings to be done in compressor, every compressor has different parameters to meet ....to obtain required temperature of cargo, this is you find in cargo compressor manual, for every cargo it's different, compressor has 3 stages and all have different parameters at different stages( pressure and temperature) by adjusting inlet outlet vavles to get desired temperature. However as I told earlier , you won't get -42 for butane coz of it's ingredients present in it and you can't compress a gas after certain limit ( otherwise tank pressures will go down), which restricts a gas to be cooled further.

[@SailorVikas]

Any doubts you are free to comment !

[@AjayPratapSingh-zv7sx]

Very nice explanation. Also, if you could please tell which book are you referring to, while explaining this..!?

[@SailorVikas]

@@AjayPratapSingh-zv7sx Liquified gas handling principles Mcquire and white

[@dexcal8009]

bro nice one

[@SailorVikas]

Thanks

[@sukhbirsingh9063]

which are good books on gas tankers available in india

[@SailorVikas]

Liquified gas handling principles SIGTTO is enough...

[@saudtaj2415]

Sir Taj saud Here i m oiler I wanna start my career in gas engineer please help And give me Manual for learning 2nd engineer give me permission.. but here everybody bsy nobody's help

[@shreyam6525]

Expansion valve throttles the liquid making it to evaporate ....

[@vinayakbhatt1037]

Sir do you have fully ref ships cargo handling manual.

[@SailorVikas]

Yes I do have ...I can email u

[@vinayakbhatt1037]

@@SailorVikas Thanx.. pls mail me on this id [e-mail]

[@SailorVikas]

@@vinayakbhatt1037 I have emailed u, I hope u received it !

[@vinayakbhatt1037]

@@SailorVikas thank you very much, I have recieved it.

[@lifeatsea6049]

@@vinayakbhatt1037 @Sailor Vikas please give cargo handling manual

[@adamssteev4519]

which book you are using

[@SailorVikas]

Liquid gas handling principles - Sigtto

[@shivarajkenganur5372]

@@SailorVikas I have some Queries so I will talk to you through email

[@SailorVikas]

@@shivarajkenganur5372 sure

[@shivarajkenganur5372]

@@SailorVikas thanks for reply sir

[@sailorajay6604]

this video is showing error

[@SailorVikas]

Open with another browser or check ur internet connection broken...I confirmed it's working fine

[@marjunhabon3748]

Title of the book? Thank you in advance

[@SailorVikas]

SIGTTO - Lifquified gas handling principles..now the new version of book has came ..however the core concept remains the same.

[@marjunhabon3748]

@@SailorVikas thank you for the response. Can i ask also a video regarding the job description of gas engineer in a lpg/lng vessel 😀

[@SailorVikas]

@@marjunhabon3748 job description in the sense job responsibilities of gas ENG onbd lpg ship ?

[@marjunhabon3748]

Yes, if you know some. Thank you so much again :D