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    Submarine Ballast Tank question
    by MouldBuilder πŸ‡¬πŸ‡§ ( Lieutenant Commander)
    πŸ“£










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    5 Posts 4 Replies 2 Photos 7 Likes
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    MouldBuilder
    Lieutenant Commander
    πŸ“ Submarine Ballast Tank question
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 7 hours ago
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    Thanks Graham.
    I will test the unit with an upgraded solenoid on the empty side this weekend.
    1
    I promise I will finish a boat project before I start another......Maybe.
    Graham93
    Warrant Officer
    πŸ“ Submarine Ballast Tank question
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 4 hours ago
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    Hi Peter,

    Switch ratings on DC are generally lower than when switching AC. The frequent current reversals with AC help with reducing arcs/ sparks when the switch operates. Having said that, it looks like you will be drawing a maximum of 2.3A through the switches, and I expect they will be fine.

    Regards Graham93
    2
    MouldBuilder
    Lieutenant Commander
    πŸ“ Submarine Ballast Tank question
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 7 hours ago
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    Thanks Graham.
    I have had a look at the switches and they are rated at 5A 125/250V AC.
    My pump draws 2A and the solenoids around 0.3A each. Is 5A at 250V AC equal to 5A at 12V DC. In other words is 5A the same regardless of voltage etc.? Clear as mud. Thanks.
    Peter.
    1
    I promise I will finish a boat project before I start another......Maybe.
    Graham93
    Warrant Officer
    πŸ“ Submarine Ballast Tank question
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 4 hours ago
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    Hi Peter,
    Provided the switches you are using are rated to carry the combined solenoid and pump current then I can’t see any need to use relays.
    Graham93
    2
    MouldBuilder
    Lieutenant Commander
    πŸ“ Submarine Ballast Tank question
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 7 hours ago
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    Hi guys and Gals.
    I was hoping for a little advice.
    I have now updated the water flow arrangement for the ballast tank of my Submarine build. It has worked generally but has highlighted a problem when it come to emptying. The system of switches works well and the pump reverses correctly and the solenoid valves switch over. Unfortunately as before, the tank fills well, and with the additional non return valve, holds the fill well, but will not empty. I have now added a pressure gauge to the tank to see which pressure switch I need to fit for safety. At 60% full it is holding 2 Bar. I have checked the solenoid valve and it is rated at 0.05Mpa. (0.5 Bar) Not enough which is why it will not operate to empty. I have now purchased a 0.4Mpa valve, (4 Bar) which should overcome this problem. My long awaited question is: Should I fit relays to the solenoid valves even though they work, and if yes, could I ask why.
    I have drawn the system as I have it and added a picture.
    Thanks.
    Peter.
    1
    I promise I will finish a boat project before I start another......Maybe.



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