# Fishing trawler problem

Discussion in 'Stability' started by mtht110, Apr 24, 2012.

1. Joined: Apr 2012
Posts: 257
Likes: 20, Points: 0, Legacy Rep: 167
Location: Haines and Juneau

### midnitmikeSenior Member

Maybe I should restate your question first.

You need to calculate the carrying capacity of your fish hold. You already know it's volume..what you need to know is the value to apply to it's volumetic measure.

Unless I'm missing something in your original post or subsequent follow ups the short answer to your question is Volume in cubic feet x 64.1 lbs.

This will give you a fairly accurate representation of the actual fish hold capacity of your vessel.

If you're looking for admeasure calculations for say documentation purposes then I'll have to defer to the experts. Twenty years as a commercial fisherman and I still can't figure out how a boat with twice the hold capacity as mine could admeasure under 5 net ton.

MM

2. Joined: Sep 2011
Posts: 6,876
Likes: 518, Points: 123, Legacy Rep: 300
Location: Spain

### TANSLSenior Member

Submarine Tom
There is no problem with me, I have good mood and I am at peace with life and with everyone. Tom, we remain as good friends as before.
Best Regards
Ignacio

3. ### Submarine TomPrevious Member

Ignacio,

Thank you.

4. Joined: Sep 2009
Posts: 5,827
Likes: 384, Points: 93, Legacy Rep: 2489
Location: North of Cuba

### hoytedowCarbon Based Life Form

¡Bravo!

5. Joined: Dec 2011
Posts: 14
Likes: 0, Points: 1, Legacy Rep: 10
Location: Port Townsend WA/ New Oleans

### MLCJunior Member

I don't have any exact numbers but this might be a helpful example.

A fishing vessel with an 1,850 cubic foot main hold will carry about 118,000lbs of water.

With tanked refrigeration it will carry about 105,000lbs of pink salmon and 95,000lbs of sockeye salmon.

It can carry around 70,000lbs of iced sablefish and around 50,000lbs of blast frozen tuna on the round.

Again, not exact numbers, but give or take no more than about 5,000lbs.

6. Joined: Feb 2012
Posts: 81
Likes: 2, Points: 8, Legacy Rep: 38
Location: Paris

### Pascal WarinJunior Member

Used to be in class approval team and this sounds acceptable. Using "finely tuned" density may be rejected as you cannot specify which kind of fish will be in hold during all vessel life.

7. Joined: Sep 2011
Posts: 6,876
Likes: 518, Points: 123, Legacy Rep: 300
Location: Spain

### TANSLSenior Member

I don't think any Class Society can reject one of the load conditions you propose. There is no obligation to specify the type of fish you have in the cellars. Moreover, you can even carry cargo other than fish.The only think they can do is asking you for explanations or for a more onerous load condition. In any case, C.S. may say that the conditions proposed by you are or are not sufficient for what is required for the ship, and accordingly extend or not extend the licenses that have been requested. But that to reject a study, can not!

8. Joined: Feb 2012
Posts: 81
Likes: 2, Points: 8, Legacy Rep: 38
Location: Paris

### Pascal WarinJunior Member

Okay try it.
I assume you know better ...

I only worked 25 years in approval of stability file.

9. Joined: Sep 2011
Posts: 6,876
Likes: 518, Points: 123, Legacy Rep: 300
Location: Spain

### TANSLSenior Member

With all due respect, despite the 25 years you're still a little "green."
Fortunately the CS. are quite open to dialogue when they wield sufficient technical reasons. And besides, as the customer is paying the bill, and there is much competition, CS is reasonable and ALWAYS willing to consider new proposals. This is my experience over 40 years dealing with CS. Do not describe them, please, as the "ogre" of the film.

10. Joined: Feb 2012
Posts: 81
Likes: 2, Points: 8, Legacy Rep: 38
Location: Paris

### Pascal WarinJunior Member

OK let the poor guy go to the wall.

Your lack of seriousness in dealing this matter is not so damaging when you do this for your own objectives.

But we (CS) are quite experienced with people trying to find a "tonnage gap" and fooling us with playing with densities.

This is but a matter of safety because we know that no fishing master has the time to perform calculations. Thus the loading conditions are to cover all possible cases.

11. Joined: Sep 2011
Posts: 6,876
Likes: 518, Points: 123, Legacy Rep: 300
Location: Spain

### TANSLSenior Member

I try to be very serious in all aspects of my life and, of course, professionally.
No one can demand, even a C.S., to explore all possible loading conditions. Will I be required to raise 4 or 5 load conditions, among which must be assumed that they are the worst and perhaps some additional situation that reflects a particular way of working the vessel. For example, the net filled with fish, hanging from the crane, a band of the boat.
In the case at hand, I argue, but it's just an opinion, that with a charge density of 1.025 t/m3 contemplates the worst possible case.
Nobody in this world or the other, may require me to specify the type of fish that's in my cellar.
And I do not understand why you have to suggest that somebody (a designer, probably) tries to deceive the CS with "tonnage gaps" or any other trick.
Best Regards.
Ignacio López

12. Joined: Feb 2012
Posts: 81
Likes: 2, Points: 8, Legacy Rep: 38
Location: Paris

### Pascal WarinJunior Member

So ?
Nobody forbid you to consider any type of loading but the worst case should be considered.

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.