Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Subsea Structures - Fishing Gear Interaction

Subsea Structures - Fishing Gear Interaction

Subsea Structures - Fishing Gear Interaction

I am trying to write a summary of options for subsea structures (manifolds etc). Obviously we can have a piled structure or a gravity based structure. Is there a design code that gives an overview of the options for dealing with fishing gear snagging? From research so far I have come across 'Over-trawlable' structures, which deflect the fishing gear, and also 'fishing friendly' structures, is this the same thing? Are there other options? Thanks

RE: Subsea Structures - Fishing Gear Interaction

ISO 13628-15, ISO 13628-1 and NORSOK U-001

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.

RE: Subsea Structures - Fishing Gear Interaction

'Overtrawlable' is different to 'Fishing friendly' in terms of the qualifications required for an overtrawlable structures-its more onerous. Have a look at the NORSOK code listed above

RE: Subsea Structures - Fishing Gear Interaction

Thanks Chaps. Yeah I've been reading through Norsok but it makes no mention of 'fishing friendly' sructures? I haven't yet got a copy of the ISO-13628 codes but have requested from doc control. Thanks again

RE: Subsea Structures - Fishing Gear Interaction

Overtrawlable structures have a profile which allows trawl gear to pass over the structure without getting snagged. Fishing loads are reduced, but not eliminated.

Fishing friendly are typically non overtrawlable so fully snag trawl gear. This leads to higher fishing loads. A fishing friendly structure is designed so the envelope has no protrusions. This allows the fishing vessel to back the nets off after snagging the structure and free itself.

Non fishing friendly would snag nets and there would be no way for the vessel to free them.

Sometimes structures are located within an exclusion zone so fishing interaction is not considered.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close