Docking a Sailboat at an Offshore Platform?

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SCUBASailor

Contributor
Messages
319
Reaction score
6
Location
Louisiana, USA
# of dives
50 - 99
I have a 31' sailboat that I'd love to use for a multi-day dive excursion to an offshore platform in the Gulf of Mexico. We sail out of Vermilion Bay in Louisiana, so to get to clear water we have to go out about 50 miles in 200' of water, more or less.

Here's my problem. How do I tie off to the platform? Yes, I know that I can tie off one end to the structure, but I need to find a way to keep the boat off the platform in case of a wind or current change. I have an inboard engine, which means I have no steerage if the boat is not actually under way, so can't just crank it up to keep the stern of the boat safely away from the structure.

I can't tie off the stern and then anchor the bow, because in 200' of water, I'd need 1000' of anchor rode for a 5:1 scope. I'm not interested in pulling up 1000' of anchor rode by hand.

Lastly, I need something that a power boater could instinctively handle when I am at the bottom, as none of my diving friends are sailors. No offense, power boaters.

Any captains have suggestions on how I might safely do this and not freak out the platform personnel?
 
Well, now, you've just come across the whole problem with platform dives. Add to that the crewboat shows up while you are in the water and make you move your boat, or mysterious nuts and bolts start "falling" off the platform because the crew doesn't like blowboats, and you'll wish you had an experienced hand you'd left behind, since they will now have to pick you up live boat.

Fashion a rig hook out of a piece of aluminum flat bar with a 24" radius hook at one end and a hole at the other. Make the flatbar of the thickness that will hold your boat without bending straight in up to 15 knot winds, but will straighten and drop off in 25 knot winds. Throw the rig hook over a cross member on the platform, and when the wind shifts, start engine, engage reverse, and pull away. The hook straightens, the contraption falls in the water (make sure the rope is long enough that it doesn't hit the boat when it lets go), your single hand you left on watch recovers the whole mess once safely away from the rig, then comes to pick you up. Now, having your hand practiced at what is essentially a man overboard maneuver is another matter entirely. Good luck.
 
Good post above. Let me say that in the many times I have tied up to a rig I have never had a situation where the wind or current switched while a dive was in progress. I would always try to tie up away from the normal crewboat docking points and had them come and go while divers were in the water.
If you are planning on remaining tied up overnight or a whole day than it would be possible to have the situation change. I would usually throw a line over a cross member and pull it back to the boat so casting off was just a matter of un-cleating the line and backing off.
Most of the rig workers were pretty good about letting me know what was or might be happening on the rig that I would be in the way of.
Sometime the biggest problem was when there was no wind or current to set the boat and it would just drift into the rig.
 
Don't expect the service boats to give your dive flag a 100 yard or whatever birth.

With a boat of that size and type, I would not leave it in the hands of anyone who did not know how to operate the vessel and if need be, come get me.

N
 
You might want to review this.

The voluntary Gulf of Mexico (GOM) communications protocol is an agreed communications format that identifies methods of notification, recommended frequencies and generally accepted two-way marine VHF radio protocols. It is for use in GOM Outer Continental Shelf areas and State Territorial Waters adjacent to Texas, Louisiana, Mississippi and Alabama.
The objective is to provide a common voluntary marine communications protocol for GOM resource users to use in alerting parties that will be interacting in the same general area. This protocol will provide a common communication format for notification and feedback between offshore platform and rig operators and others in responding to the safety needs of all GOM resources users.
Any vessel operator (commercial, for hire (charter/headboat), recreational fishermen, sport divers and oil and gas contractors and operators) proposing to approach either fixed or floating drilling, production and support facilities or oil and gas transportation infrastructure should utilize the GOM communications protocol.

PROTOCOL
Any vessel approaching either a fixed or floating offshore facility with the intent of tying to or remaining around (within 1,500 feet of) that facility for any purpose, should contact as far in advance as practical that specific facility using a marine VHF radio on Channel No. 16. All offshore facilities are identified by signage that identifies the Area, Block, Platform and Operator.
This protocol helps GOM offshore facility operators identify vessels approaching or mooring and gives shared resource users a common communication tool. If vessels fail to establish communications, a facility operator is faced with the task of evaluating the vessel's intent. Communications will help operators make a judgment on the activity and help access if the vessel poises a threat to the people or facility.

POTENTIAL HAZARDS TO FISHERMEN WHEN FISHING AROUND OFFSHORE OIL AND GAS PRODUCTION PLATFORMS
Most offshore fishermen target oil and gas production platforms as their fishing location of choice. Petroleum platforms, commonly referred to as “rigs,” provide recreation for fishermen and scuba divers because they act as artificial reefs, attracting and establishing aquatic communities, including highly sought food and sport fishes. Also, offshore facilities serve as navigation points for small marine craft. Manned facilities can also provide a haven for small craft operators forced to abandon their vessels during storms or following accidents.
Generally this interaction between fishermen and offshore platform personnel takes place without incident. However, periodically, a fisherman or scuba diver may be asked by platform personnel to move to another location. This request is generally made when certain potentially dangerous activities are taking place onboard the platform and is made for the safety of both platform personnel and the fisherman.
Some of these potential hazards to fishermen occur when construction or maintenance activities are underway. These activities frequently require use of marine support vessels that limit access to the facility and require frequent movement and the possibility for entanglement in anchor lines or mooring hardware exists. Platform cranes making lifts can expose vessels and personnel to dropped objects, and overhead work, such as blasting, welding and burning or painting, can also potentially expose people and equipment to falling debris and equipment. These activity types are easy to see and the request to move is easily understood.
Some activities taking place on offshore platforms that may also be dangerous are not as easily seen, and therefore, a request to move may be misunderstood. Activities such as well perforating, poisonous gas releases (red flashing light) or emergency shut downs that may require significant venting or flaring may not be visible from the sea surface. Perforating activities require elimination of radio transmissions to help prevent an inadvertent triggering of the explosive charges. Gas releases, some of which may be poisonous (red flashing light), have the potential to drift to the water surface and envelop a vessel, where an open flame or spark could set off the gas.
Therefore, if asked by platform personnel to move to another structure, please understand the request is made for your safety, the safety of the personnel on board the platform and the safety of the facilities. Please observe common courtesy and move to another location.

EXAMPLE
Contact Request: “Eugene Island 313 “A” Platform, this is M/V Duck, M/V Duck, on Channel 16”
Response: “Eugene Island 313 “A” back to M/V Duck. Switch to Channel No. ______.”
Follow Up on New Channel: “M/V Duck back; we are 5 miles out and in route to your location for ______ (offloading, fishing, diving, bird watching, etc) and request assistance in determining your current facility status.”
Recognition: “Eugene Island 313 “A” back; we have no current marine traffic or hazardous operations but expect a supply boat later today.” If the facility was planning operations that might preclude safe positioning of marine craft or if potentially hazardous lifting or well work is scheduled, the operator would so inform the vessel.
Notification: “M/V Duck back; we are a 25 foot sport fisherman out of Cocodrie with a total of five people on board and will approach your location at 0900 hours and estimate our stay at three hours.”
The approaching vessel has established contact, identified its intent to approach or moor, its purpose, and estimated its time of arrival and time at location. The operator is now alerted to the fact that the vessel is approaching with the intent of being in the area and can validate actual activities by visually observing the vessel and its crew.
 
Thanks for your input, gentlemen. I especially take heed to the risk of having someone used to an outboard motor having to take command of an inboard to do a pickup. The handling characteristics are probably too different to expect typical pleasure boat driver to do safely.

Captain, I appreciate your info on the channel 16 monitoring. I have spent some time on platforms, but didn't really use the radio much. I was wondering if the field coordinators monitored channel 16 or not.

I still think that I'd like to do a dive trip with my boat, but I won't do it unless I can bring along a hand that is proficient at handling a boat like mine. It would be a real hoot to pull up to a platform being operated by a crew that I used to help support from the beach. I know they would get a kick out of it.
 
Sounds like a blast SS, but 50-60 miles one way in a 31' sailboat? better make it a multi-week trip so you get a couple of days of diving in!

haha, jk, im just jealous 'cuz the friend of mine who ownes a Tartan 35 in palm beach wont let me bring more than a mask and snorkel on board. Thats a fairly fast boat for a JAM class boat, rigged for racing and he makes about 8-9kts in a good wind on a broad reach....60 miles at 8 knots....7-8 hours in pond-flat seas with a steady, hardy blow low off your beam for the whole trip....more likely though close to a 2 day sail on the way out and back. have a blast!

I know this doesnt in any way answer your original question (not that I could help with it anyway) but you got really good info from the captains above. post some pix if you make this trip, id love to see them and hear about the adventure.
 
Interesting conversation in this thread.

I never realized that offshore oil rigs allowed private boats to fish/dive around their facility. Honestly, I'm shocked they allow it! What kind of dives have you had on these offshore rigs? what can you see?
 
Interesting conversation in this thread.

I never realized that offshore oil rigs allowed private boats to fish/dive around their facility. Honestly, I'm shocked they allow it! What kind of dives have you had on these offshore rigs? what can you see?


I don't really think they can stop you from fishing or diving around the rigs, they could prevent you from tying up to them though. Generally I've heard that they don't mind it, fishermen have been tying up to rigs for decades now.

The bottom of the gulf is sandy and flat, any kind of structure you stick underwater attracts animals and you end up with a little oasis out there on the rigs below the water.
 
Interesting conversation in this thread.

I never realized that offshore oil rigs allowed private boats to fish/dive around their facility. Honestly, I'm shocked they allow it! What kind of dives have you had on these offshore rigs? what can you see?

It's like a mini (or not so mini, depending on the rig) artificial reef. We've done a lot of spearfishing on them and I've seen some pretty big Amberjack bagged there. Personally, my best was 47#'s but I know people that have topped out around 90.

It can be a bit eerie diving them with all the sounds of machinery and such, but you get used to it. Depending on the depth, there is often a 10-15' "murk layer" on the bottom where vis is measured in inches.

We've seen pretty much most of the same types of fish and stuff that you'd see on a dive anywhere in the Caribbean, but the Trigger Fish seem a bit more aggressive on the rigs. Cover your ears!

If you want some interesting reading on this, look up the book "Hell Divers Rodeo." http://www.amazon.com/Helldivers-Rodeo-Scuba-Diving-Spearfishing-Adventure/dp/0871319365

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