[PSUBS-MAILIST] Commercial question

[Sean T. Stevenson via Personal_Submersibles]

Vance - when you were piloting subs in the oilfields, what contingency
plans were in place for rescue in the event of becoming disabled?

Sean


On 2014-05-19 10:46, via Personal_Submersibles wrote:
> Pinned into some kind of "only one way out" configuration by the
> currents. Kind of nerve wracking, that one.
> Vance
>
>
> -----Original Message-----
> From: Brian Cox via Personal_Submersibles
> <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Sent: Mon, May 19, 2014 10:38 am
> Subject: Re: [PSUBS-MAILIST] Commercial question
>
> What are  'box canyon' current pins ?  I don't want to get stuck in one !
>
> --- personal_submersibles at psubs.org
> <mailto:personal_submersibles at psubs.org> wrote:
>
> From: Phil Nuytten via Personal_Submersibles
> <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org>>
> To: "Personal Submersibles General Discussion"
> <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org>>
> Subject: Re: [PSUBS-MAILIST] Commercial question
> Date: Wed, 7 May 2014 22:31:18 -0700
>
> Hi, Scott,
> The major reason that quite a few operators prefer subs over ROV's is
> the absence of a surface  tether. This allows you to go places that
> you shouldn't and wouldn't go with a machine because the risk of
> entanglement -- inside platform legs, pile jackets, etc., There are a
> number of other reasons that have to do with the operators senses
> being right on the site rather than a half a mile away. Difficult to
> explain is the 'whole grasp' scenario that ROV operators who try
> manned subs almost always mention. Simply put, in a sub with a wide
> view port or a 360 degree dome,  you have a strong sense of where
> everything is -- how long ago you passed that pipeline, what direction
> it's in to go back to, the lay of the bottom,  the trending of the
> currents, where to find lees to hide in, how to avoid 'box canyon'
> current pins, the ability to hit 'auto altitude' and fly a fixed
> height above a pipeline or cable regardless of the bottom (and
> therefore the cable's) undulations. When it comes to doing complex
> work using manips, there's no contest man versus machines. Machines do
> get the work done if they are set up properly, but much slower and
> with many tries, compared to the pilot whose hand on the joystick is
> five feet away from the work .
> You often hear ROV types say 'well, it's just the same as being
> there". . .  Yeah, right! just like telephone sex is the same as the
> real thing!
> I'll get off my soapbox now.
> Phil
>  
> *From:* swaters via Personal_Submersibles
> <mailto:personal_submersibles at psubs.org>
> *Sent:* Wednesday, May 14, 2014 7:43 PM
> *To:* personal_submersibles at psubs.org
> <mailto:personal_submersibles at psubs.org>
> *Subject:* [PSUBS-MAILIST] Commercial question
>  
> I have always heard that ROV's are cheaper to operate, less risky, and
> cheaper to buy. I was curious what is the advantages of submarines in
> the commercial world such as the oil industry? It seems like Phil
> Nuyten has been able to be sucsessful with submarines. Just a
> curiousity of mine.
> Thanks,
> Scott Waters
>  

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