What is the role of pressure vacuum (PV) valve on ships??

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This video answers an important oral exam question asked of mariners. The use of pictures aid understanding. Knowledge gained from this video helps in ship safety.
Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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[@shanmukhpraveen1844]

Respected sir, you made nearly 780 videos , I’m very thank full to u for giving such a informative videos.keep doing such knowledgable videos.im eagerly waiting for your videos .thank you so much sir. Thank u . 🤝🌟

[@SteeringMariners]

you are most welcome, glad the videos are helping.

[@shanmukhpraveen1844]

@@SteeringMariners YES SIR, ABSOLUTELY HELPING.RIGHTNOW WATCHING THOSE ANCHORING PROCEDURES

[@didarsarker3292]

Thank you so much sir. Love from Bangladesh❤️

[@shap4878]

Sir eagerly waiting for your videos thank you so much for the best content. Pls make videos regularly.

[@raymondallenjhangiani7670]

Very vital apparatus in tankers ? good explanation ! Thank you 🙏 Sir ! much appreciated !

[@neerajbalhara2650]

Thank you 🥰

[@stephenvelencovaz4354]

Thank you sir

[@jesg5612]

If the air go inside the tank when the time of low pressure....anything chance to get fire in the cargo tank?

[@astlefernandes1429]

Wen tank is going in negative pressure the vaccum valve open up means pushes up n air goes inside the tank to avoid tank become puncture no but if vaccum in tank increases from wer it releases out bcose vaccum is air it can occur to fire ?can u tell me this sir if wrong can u explain me this ??

[@pawanjeetsingh6971]

Sir in case mast riser is fitted which is not fitted on chemical tankers ,, pv valve is still primary means of venting Secondary will be alarm system ….. then how about Mast riser please clarify ???is mast riser primary along with pv ??

[@srampal123]

These gases do not burn due over rich content , thus air is preventd to ingress

[@srampal123]

Sir, where is such vaccume valve iis fitted on a liquid gas carrier, then why these ships are fitted with ESD trip at zero tank pressure, respect your views but do not include liquid gas carrieres वैक्यूम connection