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Blog about diving in Burma and Thailand

Are you properly weighted for your dive?

3/6/2020

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"How much weight do I need?" "Should I take one more kilo to be sure?", "how do I know when I can shed one more weight from my belt?".
These are very common questions asked to dive professionals all over the world. 

​Good buoyancy control is a crucial part of diving which allows you to dive safely, while avoid damaging the reef or your equipment. When properly weighted, you will consume less air, and generally enjoy your dive more.
Although mastering this art requires time and practice, a very good place to start is with appropriate weighting!
wonderful coral reef in Burma


​How do you know if you took way too much weigh for your dive?

  1. At the surface, with a fully inflated BCD (Buoyancy Control Device), do you need to kick constantly to keep your head above water?
  2. While descending do you have trouble controlling your speed? Do you have trouble equalizing because you are sinking like a stone? 
  3. At the bottom, do you have to add a lot of air to your BCD?
  4. Do you have a hard time maintaining a horizontal position?  
  5. Does it take a lot of energy to move? Do you frequently have bottom contact when you dive? 
  6. Do you often have a Yo-Yo profile, going up and down frequently? Do you have to regularly add and remove air from your BCD?

If your answer is yes to one of these question you have probably way too much weight on your weight-belt or in your weight-pockets!!!

How do you know if you are underweighted?

  1. Do you have trouble descending? Even with your lungs and BCD fully emptied?
  2. Do you have trouble staying at the bottom without any air in your BCD? 
  3. Do you tend to float up towards the surface? 
  4. Do you find it impossible to remain stable during your safety stop?

If your answer is yes to one of these question you have probably way too little weight on your weight-belt or in your weight-pockets!!!

How to find the right amount of weight you need?

In theory:
With a 3mm wetsuit in salt water, with a 12L aluminum tank, you will need around 5% of your body weight.
With a 5mm wetsuit in salt water, with a 12L aluminum tank, you will need around 8% of your body weight.
 
Example : Diver of 75kg with a 3mm wetsuit, 12L Alu tank = 4kg
                 Diver of 60kg with a 5mm wetsuit 12L Alu tank = 5kg

Of course, adapt it depending if it’s salt of fresh water, aluminum or steel tank, 12L or 15L tank, and most of all the experience of every diver!

  • Difference between steel and aluminum tank
A 12L Aluminum tank :
- Is 0,75kg negatively buoyant when full
- Is 1,25kg positively buoyant when reached 35bar

A 12L steel tank :
- Is 4kg negatively buoyant when full
- Is still 1,3kg negatively buoyant when empty

So, if you dive with a steel tank, you will need less weight than with Aluminum tank (about 2,5kg). So choose Steel tank when possible if you are diving with a thick exposure suit.

  • If you dive with a 15L tank
Remove 0,5kg if using an aluminum tank
Remove 1 to 2 kg if using a steel tank
​
  • Difference between fresh water and salt water
If you are used to dive in salt water, remove 2 to 3 kg in fresh water.
There are also differences in the salinity of each ocean. Ask the local guides whenever you go to a new destination.

Consider the weight of your gear 

BCDs have different weights depending on the style. For example a travel BCD will be much lighter than a Wing setup with a steel or aluminum backplate. 
Your Regulator, fins, torch, camera can also make a big difference.

In practice, how do you know that you are perfectly weighted?

A perfectly weighted diver will be able to enjoy their dive and end it with a stable safety stop with their empty BCD.
Ok, so I managed to do my safety stop properly, now, how do I know if I can still shed another weight for the next dives?
​

At the end of your dive you can check the accuracy of your weights with this weight check :
  1. With roughly 50bar left in your tank at the surface, deflate your BCD completely.
  2. Hold a normal breath without moving.
  3. You should be able to float at eye level.
  4. When you exhale, you should sink slowly.
 
When you find the right amount of weight for you, it is normal for you to begin your dive by adding a small amount of air to your BCD to become neutrally buoyant at depth. As you reduce your depths and use the air in your tank you will need to release some of the air to remain neutral throughout the dive.

With experienced you will get more comfortable and understand how to use your breathing as buoyancy and it will become as natural as walking.
Using your lungs to adjust whether you rise up or descend is they key to happily floating around the dive site with ease, but remember to never hold your breath! â€‹
Remember that the inflator button on your BCD is not an elevator and should be used sparingly. 
We hope these little tips helped you and answered your questions!
​See you next season, with perfect buoyancy !!
Divers make bubbles!


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Camille Fogarolo 

Camille has been traveling the world since her mid twenties and dived many seas before finally settling down in Thailand in 2012. With her husband Franck, they opened The Smiling Seahorse liveaboard to offer cruises in the most unexplored area of South East Asia and became quite the experts when it comes to diving in Myanmar! Proud mother of two she still travels as much as she can and usually joins a dive trip to Mergui Archipelago every month.

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  • When & Where
    • Schedule and Prices
    • Destinations >
      • North Andaman Thailand >
        • Similan Islands
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          • Richelieu Rock
        • The essential Underwater photo Guide to diving Thailand
      • South Andaman Thailand >
        • Phuket & Koh Phi Phi National Parks
        • Koh Lanta National Park
        • Koh Lipe and Tarutao National Park
      • Mergui Archipelago >
        • Liveaboard diving holiday in Myanmar
        • Burma's best dive sites
        • The Ultimate Underwater photo Guide to diving Burma
  • ABOUT
    • Our Boat >
      • DELICIOUS FOOD
    • Diving in Thailand in 2024-2025
    • Diving in Myanmar/Burma in 2024-2025
    • Blackwater diving in Thailand and Myannmar
    • Marine life in Thailand's Andaman Sea
    • Marine life in Mergui Archipelago
    • Dive Courses >
      • Learn to Dive
      • Continue diving education
      • Rescue diver
      • Professional Dive Courses
      • Hone your dive skills with a specialty course
      • Photo coaching in Thailand on the Smiling Seahorse
    • Guest Book
    • FAQ
  • Plan your trip
    • Our hotels recommendations
    • Khao Sok National Park
    • Taxi services >
      • Taxi services to and from Ranong
      • Taxi services to and from Phuket
      • Taxi services to Tap Lamu and Khao Lak
    • 10 things to do around Ranong
  • PROMO
    • HOT DEALS
    • Special Expeditions >
      • 8D Special Marine Bio with Piers Baillie - 10 Nov 2025
      • 8D Whale shark expedition - 20 March 2026 - North and South
  • gallery
    • Photos
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  • CONTACT
  • BLOG
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