Exxon USA recently installed the world's first commercial guyed tower offshore platform in 1,000 feet of water in a new gas and oil field southeast of New Orleans in the Gulf of Mexico. Total development cost for the field is in excess of $750 million.
The new platform design significantly reduces the construction cost of platforms for use in water depths approaching 2,000 feet, compared with conventional fixed platforms. Cost efficiencies result from the use of less structural steel in the guyed tower.
For stability, a conventional platform is designed to be rigid when exposed to environmental forces. This causes the platform to be considerably wider at the bottom than at the top. The guyed tower, by contrast, is 120 feet square along its 1,078-foot length and is designed to move with wind and wave forces.
Steel piles attach the tower to the ocean floor similar to a conventional platform. A network of 20 guylines arranged symmetrically around the tower and anchored into the ocean floor keeps the structure from overturning.
The guying system allows the tower to comply—to move slightly—and then return to its normal position as environmental forces vary.
Each guyline extends about 1,800 feet from the tower to a 200 ton weight. Known as clump weights, they are built in segments and joined together much like links in a bicycle chain. As waves or winds move the tower, the cable will lift segments in the clump weight and then set them down when the tension relaxes.
A test model's performance indicates that the deck will move less than three feet off center 99 percent of the time. Even in a hurricane with winds of 130 mph and waves about 70 feet high, the tower will be resilient. The deck could move as far as 40 feet off center without damaging the tower's pilings or breaking a guyline.
In 1981, construction of the tower began at Brown & Root's fabrication yard at Port Aransas, Texas, near Corpus Christi. The tower weighs 27,000 tons and has more than 15 miles of welds. Once completed, the structure—with decks and drilling rigs added atop the tower—will be 1,300 feet tall, approximately the height of a 100- story building.
It took a five-day voyage on a launch barge nearly as long as two football fields to carry the tower to a new oil and gas field in Mississippi Canyon Block 280, about 110 miles southeast of New Orleans.
Because of the length of the tower, the launch barge was modified to tip the tower into the Gulf off the side, instead of the end, as is usually done. The side launch reduces the risk of damage to the tower and the barge. It also eliminates the need for about 3,000 tons of additional steel to reinforce the tower for an end launch. After launch, the guylines were securely attached to the tower.
Later this summer the three deck levels will be brought to the site by barge and lifted into place.
The two acres of deck space will hold two drilling rigs, production equipment, and living quarters for up to 140 people during the first years of operation.
Development drilling from the guyed tower platform should begin in late 1983, with production starting in 1984. A total of 58 production wells are planned for the field. Including drilling, pipelines, and other development costs, the guyed tower project will represent an investment of more than $750 million.
, geological and geophysical advances, the environment, and special topics. Sessions of particular interest will feature discussions of Exxon's Lena Guyed Tower, an innovative deepwater platform in the Gulf of Mexico; Shell's record water-depth well; and floating production facilities. The OTC Awards
work pay off. New to the squad, first baseman Robert Howard is formidable at the plate and has a glove like a gill net. Anything but an ordinary average guy, pitcher Joe Walsh holds down the center of the infield, while shortstop Yampiel Chavez provides speed, range and power. Utility man Gus Doskey has
are recommended only when serious vibration problems may occur. Paper No. 12—"Hydroelasticity and Vibrations of Internal Steelwork of Tanks" by Guy C. Volcy, Michele M. Baudin, Michel D. Bereau and Francois G. Besnier. SYNOPSIS — Theoretical studies aimed at solving the problem of vibrations
, softwarebased control systems. The new TANO/VME microprocessor family includes both a military series and a ruggedized commercial series, according to Guy Hardwick, TANO vice president of marketing and quality assurance. TANO has designed six different VME modules: a high-performance CPU or main processor
Navy for the design, development, and production of a new submarine navigation radar. "This is one of the largest programs we have ever received," said Guy S. Barnocky, program manager for military radar. "It will utilize the latest in radar technology in both RF and digital circuitry and techniques
Guy Ames Stitt, president of American Maritime Int'l, Inc. (AMI), has announced the appointment of Dennis C. Tarbutton to the position of vice president-marine support services. Mr. Tarbutton will have the responsibility for providing support services to marine equipment manufacturers and other
includes engineering services and offshore control and monitoring systems. This area has supported such innovative offshore programs as the Exxon Lena Guyed Tower installation. Caroline Z. Richards has been named acoustics business manager. Ms. Richards has been involved with acoustic product marketing at
engineering services and offshore control and monitoring systems. This area has supported such innovative offshore programs as Exxon's Lena guyed tower installation. Caroline Z. Richards has been appointed acoustics business manager. She has been involved with acoustic product marketing
Lucian Q. Moffitt, Inc., a subsidiary of BFGoodrich, has named Guy Tompkins as a manufacturer's representative for BFGoodrich Cutless® brand bearings. He will cover the commercial marine industry in Maryland, Virginia, North Carolina, and South Carolina. Mr. Tompkins' marine products group consists
. The facility, which will be adjacent to Public Berth 202 at the Holland Terminal, will fill an important need at the port, according to port director Guy N. Verger. C o n s t r u c t i o n contract was awarded to Diamond Manufacturing Co. of Savannah, Ga., the low bidder. The 15,400-square-foot
If there’s anything Capt. Guy Sorensen learned in his decades of working with professional mariners it’s that they learn in a variety of ways, times and places. “That’s why we launched our home study programs,” said Sorensen, who founded the Virginia-based Chesapeake Marine Training Institute in 1992.
world yearbook CONTAINERSHIPS BY GUY COOPER, CARGO ANALYST, VESSELS VALUE this larger tonnage, peaking in April 2019 at $25,000 per NEWBUILD The highlight for newbuild orders in the last 12 months day, the highest it has been for nearly four years. must certainly be HMM’s mammoth order back in Sep- DEMOLITI
that but I really need this,’ then we’ll add that marine software and sonar equipment each had precise guid- component,” said Nash. “The end users are the guys in the ance, giving operators clarity and visibility to work. seat all day, so we listen to what they have to say and we Blake Yaffee, area manager
Products Beacons, Flashers, Trackers Beacons, Flashers & Trackers: Products to Promote Safety at Sea By Tom Mulligan L3 Technologies, together with So- tracking and communications with up to The Oculus M750d is a general-pur- nardyne, will offer 6G-enabled capabil- 10 AUVs at the same time. pose dual-freque
started off by a successful outcome. But, for all that, The message from both is clear: com- Folan puts it best when he says, “Let’s saying, “The little guy can make it.” simple compliance isn’t enough. In the pliance, without ‘buy-in’ from the per- not ? nd out.” I think that’s good advice. And, despite
kg — a real- João Tasso De Figueiredo Borges De Sousa of the University ity. Apart from the command and control of networked AUVS of Porto, is the go-to guy if you’re contemplating what’s pos- (and other drones) en masse, which is Prof. De Sousa’s spe- sible in the world of AUVs. Dr. Rajan is af? liated
touch it. It is hard to convey you wouldn’t want to meet some in a dark alley. that experience. You expect that feeling with a Then you fnd out this guy’s a surgeon. You tell horse or dog but don’t expect to connect with ‘em what you ride and you’re part of the gang. a whale. It happened so fast,
manufacture of ropes for assembly and fabrication for Lifeline The approach has been to design the naval applications and is ideal where and Flagstaff guy lines based on Navy rope to be recycled at the outset. Phil- moderate elasticity may be useful, but approved, termination technology. lystran is deploying
, the comman- dants. In terms of personal leadership – what makes me tick – my dad prob- ably a little bit. He was a school teacher and he’s an active guy in his community. He would go to work every day as a teacher, a coach, and try to make a dif- ference in young people’s lives. I think I’ve always
for Re- rect, with a dry sense of humor. He’s the a ? eet.” I would feel around the corner to see if solve Marine Group. “Joey led the team kind of guy to buy you a beer - or brew it The ebb and ? ow of salvage business 30 Maritime Reporter & Engineering News • NOVEMBER 2018 MR #11 (26-33).indd
envi- ronmental regulation, it’s not a question of affordability in meeting it, says Ashcroft. “When auto emissions were ? rst put into place, the auto guys said they couldn’t do it. But they have met or exceeded those standards. If there is a rule out there that needs to be done, the shipping industry
“When auto emissions were ? rst put into place, the auto guys said they couldn’t do it. But they have met or exceeded those standards. If there is a rule out there that needs to be done, the shipping industry will require some way of meeting it even if we may not understand [what it will be] today.
tiny 8’x10’ booth. we head into the next 125 years. I may on a 30+ chapter revision of our Marine You cannot ? t any equipment in a space be the new guy, but I have absolute Engineering text book, as well as an this size, and there is little attraction con? dence in the ship I’ve been tasked update
to plead ignorance: ‘Oh we did not know we were hacked,’ It won’t ? y. The folks who manage legal and insurance need to worry about this, not just tech guys. ” ” Dean Shoultz, CTO, MarineCFO Adding to already existing risk within large sum of money to a vendor for some and a terrorism standpoint, those
a whole, are all legal and insurance need to worry about Beach and NY/Newark. The shut down the external links to internal systems, this, not just tech guys.” there and at other ports, and the ensuing Cut (( Ask Nicole )) the advent of autonomous vessels, the In September 2016, then U.S. Coast cleanup
my ? eet in a co-op pool, To that end, TRAC has joined the TRAC Intermodal this year introduced be able to supply a driver (and remote then the other guy gets to use it. And so Blockchain in Transport Alliance – a product that combines a new Carrier monitoring sites) with as many as 8 or 10 I’m investing
. Our guide, Marad’s Erhard Koehler, gine room. Ever the deckie, I wanted ing a serious and depressing ? ashback to was the perfect host and perhaps the guy to see the bridge and wander around on my days at sea, but I recovered quickly ‘Savannah’ on my mind who knows more about the N.S. Savan- deck. Eventually
on the tive But Unclassi? ed (SBU) Type III encryption require- open market to state and local agencies, FLIR and Rayma- ments. This allows the ‘good guys’ to share information rine will help to strengthen the interoperability of all ? rst without fear of that data falling into the wrong hands.” responders
today. to traditional models. So Marine Learn- would say four years ago we were at the stand (the power and potential of) blend- Absolutely. I’m an old guy so I’ve ing Systems does two things: it provides point where the vast majority in the mar- ed learning. So we are not there yet, but been around
directed us to put out. We have enough to into play and is failed to be understood by the general public. man up MSP feet, the Jones Act feet and the RRF guys. We “Telling that story, or fnding a better way to tell that story, I have enough to man all those up and get them out the door. think is our challenge
based on merit, they were brought up out place at the of? ce ? rst and that new way of doing business of necessity. It’s almost impossible to tell the guy on deck will have to be introduced and constantly reinforced with how to do something when you aren’t sure yourself. This the crews. Many small companies
likelihood, those commercial ships will be operating in two months now. What’s your view of the business, the a contested environment, meaning the bad-guys will be domestic waterfront? Give me a SITREP if you would hunting them. It won’t be a cruise in the sunshine. Some from the Maritime Administrator’s
Demos board we thought it might have issues. e e e er A/S’ claim in its entirety, and In the same week that a report from ABS Little did we know… the guys pressed the O O O OceanSaver AS was ordered to pay all revealed problems with almost half of in- ‘start button’ and it came into action im- a a a
Digital Transformation of Port Operations About the Author Guy T. Noll is Maritime Principal Consul- tant at Esri. Liberating ENC Data for Nearshore Risk Management INSIGHTS: PORT SAFETY Electronic Navigational Chart (ENC) data, and be sent upstream, respectively, to the weekly releases of ENC updates
into ship safety for the Noll Business Publications Audit Lundquist James Espino is president of of Circulation, Inc. National Maritime Institute. Guy T. Noll is Maritime Prin- Gnostech Inc. A career Coast Edward Lundquist is a retired cipal Consultant at Esri. 4 Maritime Reporter & Engineering