+--------------------------------------------------------------------------+ | ATLANTIS CRUISE SYNOPSIS | +--------------------------------------------------------------------------+ Voyage - Leg: AT 15-33 Voyage Dates: 23- 29 Jun, 2008 Chief Scientist(s): James Mercer (Mercer) Address: University of Washington, Applied Physics Laboratory 1013 NE 40th St. Seattle, WA 98105 Phone: 206-543-1361 Email: mercer @apl.washington.edu Cruise Objective: Recover acoustic transducer from ocean floor in 900 m of water. Recover tripod off Half Moon Bay CA. 1-2 days on station using Jason/Medea. Science Activities: Operations Area: 37 20.9275N/123 26.4575W 900 m Depth Range Departure Port: San Diego, California Agent: Master R/V Ship Name Attn: Scientist's Name c/o Paxton, Shreve & Hays Inc. 2191 Main St. San Diego, CA 92113 Contact: Tom Jenkins Phone: (619) 232-8941 Fax: (619) 232-3006 Telex: 6731029 SHREVE SDG Email: [1]marineops@pshinc.net Arrival Port: Astoria, Oregon Agent: Master R/V Ship Name Attn: Scientist's Name c/o Ship Service Co. 968 Commercial St. Astoria, OR 97103 Contact: Lou Marconeri Phone: (503) 325-3721 Fax: (503) 325-4109 Cell: (503) 791-0796 Email: [2]lmarconeri@knutsenins.com SHIP Installed or Normally Carried Equipment: 12 kHz bathymetry system ADCP - 75 KHz 3.5 kHz bathymetry system Relay transponder for wire use Pinger for wire use Seabeam WHOI-Provided Equipment: Jason/Medea Science Party-Provided Equipment: 10 foot tool van Notes: Require ship's crane and A-frame ALVIN/JASON Installed or Normally Portable air compressors, Search Sonar, Carried Equipment: Manipulators for removing lifting hook for a pre-deployed line basket and attaching the same to the transducer frame that is to be recovered. Science Party-Provided Lantec series 750 winch with the -163 drum. The Equipment: rated pull is 60,000# at the core (60,000 lb-ft torque). I spoke with the manufacturer and their basic design guide line for the internals (gears, brakes, shafting, hydraulic pressures, etc is a factor of safety of 3) so the winch will not let go with a 180,000# (180,000 lb-ft) load a the core. We expect to be at no greater drum diameter than 38" with the 4000 ft of .75" dia Spectra. Taking the Spectra at 60,000 # BS x 150% at the 38" loaded diameter I get 142,500 ft-lbs (max possible applied load plus 150% rating) with is less than the rating of the winch. If however one uses the load capability of the winch with the ratchet and dog (that our rental winch has) the winch load rating goes to about 10 times working per the manufacturer. That is far beyond any applicable load. Again the anticipated working load on the line is not expected to exceed 12,000# plus surge. The next sketch shows an elevation view in the plane of the load and the line is leaving the winch at a 30 deg vertical angle (actual should be considerably less than that) giving a moment arm of 62" about the aft bolt group. If one takes the breaking strength of the Spectra x 150% (90,000#) and assumes the load is at one edge of the winch drum (so the 2 bolts see all the tension and one pad only is loaded) the tension on the 1.5" dia bolts and 1" pad bolts is 90,000# x 62"/46"(ave length) gives 121,300# total on the bolts (again all the load on one side of the winch base only) The grade 5 bolts are good for 105,000 psi (ultimate) so the 1" can withstand 63,500# ea and the 1.5" at 147,000# ea so the 4 ea 1" in the pads can hold 254,000# and the 2 ea 1.5" thru the winch base can hold 294,000# - both in significant excess of the 121,300# that could be applied (with 150% factors of overload and all one side). The shear loads are relatively small 90,000#/9.68 in2 (9,300 psi average 16 bolts) for the 1" bolts and 90,000#/11.2 in2 (8,000 psi average 8 bolts) for the 1.5" dia bolts. Significant torque on these bolts would generate enough friction to carry all the shear load. The choice of bolting the winch directly to the pads vice welding tapped bars to the pads is to eliminate the problems of a certified welder and the time and cost for that. Drilling 8 ea x 1.5" dia holes in 1" think plate is not insignificant but is done with a coring bit on a magnetic base drill in a short time by APL staff. Then there is no question as to weld quality, amount, alloy used, etc. The attached pdf's show the mounting hardware - basically the Lantec winch will mount with 8 (2 in each "corner" of the winch base) 1.50 dia grade 5 bolts to the 4 plates and each plate will be bolted down with 4 ea 1.0 dia grade 5 bolts. Coming in another email/pdf's is a layout and load lines for the winch and a further description of the winch. There will be a few tapped holes in the plates to temporarily install lifting eye bolts to move and position the 250# ea plates with a crane. (Figures have been provided separately.) Notes: From Mercer 06/11 BD: CRUISE PLAN Recovery of the ATOC Pioneer Sea Mount Acoustic Source R/V ATLANTIS and ROV JASON Cruise ID # 108771 23-29 June 2008 Prepared by James Mercer Background The purpose of this cruise is to recover an acoustic source resting on Pioneer Sea Mount, near Half Moon Bay, California. The acoustic source was installed in 1995 by the Applied Physics Laboratory, University of Washington (APL-UW) as part of the Acoustic Thermometry of Ocean Climate (ATOC) program sponsored originally by the Defense Applied Research Projects Agency and subsequently by the Office of Naval Research. Although the acoustic source performed very well, transmissions were only permitted at infrequent intervals following aerial surveys by marine mammal observers. When the National Marine Fisheries Service permit for its operation expired, the transmissions ceased; and the expense of obtaining an additional permit was considered prohibitive. The first attempt to recover the acoustic source occurred in August of 1999 with the R/V Thompson. The source transducer is secured in a tripod-frame, see Figure 1, which includes a recovery line tub, an acoustic release, and floats to bring the recovery line to the surface. A vertical hydrophone line array was also attached to the frame. The purpose of this line array was to receive transmissions from an identical source installed near the Island of Kauai, HI. Unfortunately, when the acoustic release was triggered, the recovery line became entangled with the short vertical line array even though they were secured on opposite sides of the source frame. Figure 1. The ATOC source aboard the M/V Independence before installation on the Pioneer Sea Mount. Prior to a second recovery attempt the site was surveyed by the R/V Western Flyer and the ROV Tiburon. The operators of Tiburon were able to cut and free the vertical line array and the section of the entangled recovery line. In addition, a recovery line basket was placed on the bottom and a section of the Spectra line from the basket was attached to the lifting eye on the source platform. In August of 2000, the M/V Independence and a crew from MariPro attempted another recovery. The *-inch Spectra recovery line was successfully brought to the surface and applied to the double-drum Skagit traction winch. Unfortunately, there was insufficient friction between the drums of the winch and the Spectra line to complete the recovery. The recovery line was subsequently re-directed to a Pengo traction machine but a chain supporting a turning block failed, the recovery line was cut, and the source frame fell back to the bottom. Since the source was still connected to the shore station via the undersea cable it was possible to determine that the acoustic source had not been damaged by the fall to the bottom. In September of 2000 the R/V Western Flyer and the Tiburon returned to the site to inspect the acoustic source frame. Apparently the source frame fell upside down and landed on its lifting eye which was bent at a 20-40 degree angle. The frame is currently resting on its side as shown in Figure 2, at 37* 20.9406 N, 123* 26.4535 W, in 940 m of water. There was no other apparent physical damage. Figure 2. The ATOC source as it now rests on its side. The view is looking toward the top of the tripod frame. Summary Schedule Mobilization for the R/V Atlantis recovery cruise will begin on 20 June 2008 at the 10^th Avenue Terminal in San Diego, California. The Atlantis will depart the 10^th Avenue pier at 0800 hours on 23 June and after refueling should be underway for Pioneer Sea Mount by 1200 hours. It is expected to be at the recovery site around 0430 hours on 25 June. This will allow approximately 48 hours for the recovery operation before departing the site at 0500 hours on 27 June. The vessel should arrive at the Astoria, Oregon sea buoy near 0700 hours on 29 June. A crane has been scheduled for 30 June to remove the source frame from the vessel. The frame will be disassembled prior to shipment to APL-UW. A list of the APL-UW science team is provided in Appendix A. Source Frame Description The acoustic transducer is mounted in a galvanized steel tripod frame, Figure 3. The feet of the equilateral frame base are approximately 12 feet apart from one another and the height of the frame is also about 12 feet. The frame weighs roughly 7,500 pounds in seawater and 12,000 pounds in air. A short length (10-20 feet) of undersea cable (See Appendix B) is still attached to the frame. Mounted on the frame are several ancillary pieces of hardware. Along each of the base legs of the tripod are open enclosures that contain vented 6,000 psi gas bottles. These bottles were used to bring the internal cavity of the transducer to ambient pressure with nitrogen gas. An InterOcean Systems acoustic valve mounted on the frame was used to release the nitrogen once the frame reached the bottom. The acoustic valve receives 12 kHz and transmits 8 kHz. A plug at the bottom of the transducer cavity was removed during the first recovery attempt and the cavity should now be filled with water and possibly some nitrogen. A Benthos 865A acoustic release was mounted near the corner of two of the base legs to release the recovery floats and line. This release was loaded with Lithium batteries and is most likely still operational and should be an aide in locating the source frame. This release receives at 9.5 kHz and transmits at 9.0 kHz. Its enable code is C and its release code is D. There are also two Benthos TR6000 17-inch transponder balls, each located above one of the tripod's feet. One of them receives at 8.5 kHz and the other at 10.0 kHz. One of them is enabled by the A code and the other by the B code. They both transmit at 9.0 kHz. The Benthos transponder balls are less likely to still be operational. There are two other pressure cases mounted on the frame. One is for the T/R (transmit/receive) switch, and the other is for the receiver electronics. Finally, there is also a battery powered acoustic tilt meter that was used during the initial deployment. Its batteries ran until extinction. Appendix C provides a summary of acoustic frequencies associated with the frame. As originally installed on the Pioneer Seamount, the projector was lowered over the stern with 46 meters of Samson Double Braid line and then to the seafloor with 1,400 meters of 5/8" steel wire rope. During lowering operations, the submarine SD cable and 5/8" wire rope were married together using black electrical tape and four Kevlar Yale grips. During the last Tiburon survey the submarine SD cable and the Samson Double Braid line were cut within 10-20 feet of the source frame. In addition, the *-inch Spectra recovery line from the previous recovery attempt was cut near the source frame. Figure 3. Line drawing of the source package with dimensions in inches. Mobilization All of the APL-UW recovery hardware will be shipped to the 10^th Avenue Pier in San Diego via a flatbed truck which will be scheduled to arrive on the morning of June 20. A rented crane (arranged by WHOI) will be used to place the Lantec winch on the centerline of the fantail just aft of the Alvin Hanger. APL-UW will provide deck plates for securing the winch (Appendix D). The crane will also be used to place the winch's hydraulic power unit on the deck. Note: the hydraulic power unit must be placed within 25 feet of the winch to accommodate the hydraulic hoses. Finally, the crane will be used to place the APL-UW 8X10-foot van, line basket, and deck plates on the fantail. The hydraulic power unit, the van, and the line basket will be secured to the deck with chain (or straps) and deck eye bolts. If possible, the line basket will be weighed in sea water to assure the correct buoyancy. Method of Recovery Once on site the APL-UW Benthos deck box and transducer will be utilized to determine if the acoustic release mounted on the ATOC frame is still operational. If it is, it will be a useful beacon to help direct the ROV Jason to the frame. Prior to launching Jason, however, the recovery line basket must be placed on the bottom near the frame location. The line basket will be weighed in water at APL-UW, or during mobilization, to obtain a negative buoyancy of approximately 100 pounds. During deployment additional chain weights will be added to the basket to increase its weight to roughly 400 pounds. If the basket needs to be re-positioned after landing on the bottom, these weights will be detached by Jason. The basket will be deployed using the 1/4-inch hydro wire. When the basket reaches a depth of 200 m the deck box and its transducer will be used to interrogate the releases in the line basket, and the lowering release attached to the hydro wire, to assure their integrity. If possible, this check will continue as the basket is lowered to the bottom. Tension on the hydro wire will be monitored as well as possible to ascertain when the basket reaches the bottom. Once the basket is on the bottom, the deck box and transducer will be used to open the lowering release. It can be difficult at times to detect the release code indicating that the release has opened, therefore it may be necessary to rely upon the hydro wire tension. After the hydro wire has been recovered, Jason will be deployed and after routine operational checks it will head for the line basket and source frame. The Jason crew will most likely have attached additional beacons to the line basket before deployment to aide locating it. After locating the line basket the Jason will attempt to locate the ATOC source frame. Once it is located Jason will leave a beacon in the vicinity of the frame. If necessary, Jason will remove the chain weights attached to the line basket and re-position it closer to the frame. The line basket will contain 1200 m of 3/4-inch Spectra line. 50 m of this line will be attached to the outside of the basket and to a Crosby Shur-Loc hook and recovery apparatus. Jason will remove the hook and apparatus from the basket and attach it to one of the tripod legs `above' the cross member so that the frame will arrive at the surface in a near vertical orientation. The hook and apparatus will consist of a pre-formed recovery strap formed to aide in its placement around the frame leg. When the strap is in place, Jason will be recovered. Following the recovery of Jason, the acoustic releases in the wire basket will be released and the floats attached to the releases and the recovery line will be sent to the surface. Locating the float package will be aided by reflective tape, lights, and radio beacons provided by the Jason crew. The recovery line will be passed through APL-UW's 50,000 pound Skookum block mounted at the center of Atlantis' A-Frame and brought to the underside of the Lantec winch drum (Appendix E) which will be positioned centerline just aft of the Alvin Hanger. While the recovery line is being hauled in, a load cell mounted between the sheave and the A-Frame will be monitored to avoid excessive tension. The last 200 m of the recovery line will be marked and coded every 25 m so that the approach of the frame can be anticipated. As the frame nears the surface, Atlantis will maintain minimal forward way with the bow thruster to keep dangling lines, etc. from fouling in the main drive. After the frame is secured aboard the ship, as much of the dangling debris will be hauled aboard and/or cut free of the frame. Disassembly of minor components attached to the frame will begin while Atlantis is transiting to Astoria, Oregon. Demobilization The first order of business upon arrival in Astoria will be the packaging and preparations for off-loading Jason and its ancillary equipment. The disassembly of the ATOC source frame will continue on a not-to-interfere basis. A crane will arrive on Monday 30 June to off-load Jason and the ATOC frame. Final disassembly of the frame will occur pier side in preparation for shipment back to APL-UW on 1 July. Appendix A APL-UW Science Crew James Mercer - Chief Scientist, 206.940.1037 (cell), [3]mercer@apl.washington.edu Fred Karig - Mechanical Engineer, 206.543.1354, [4]fred@apl.washington.edu Lyle Gullings - Sonar Engineer, 206.543.1296, [5]lyle@apl.washington.edu Eric Boget - Marine Engineer, 206.685.1971, [6]boget@apl.washington.edu Andrew White - Graduate Student, 206.685.7977, [7]andrew8@apl.washington.edu Additional Contacts Monty Bolstad - Research Administrator, 206.543.9826, [8]monty@apl.washington.edu Liz Caporelli - WHOI, 508.289.2277, [9]ecaporelli@whoi.edu Barbara Costello - WHOI, 508.289.3581, [10]bcostell0@whoi.edu David Fisichella - WHOI, 508.289.2777, [11]dfisichella@whoi.edu Tom Jenkins - Marine ops San Diego, 619.232.8941, [12]marineops@pshinc.net Ellen Livingston - 703.696.4203, [13]livinge@onr.navy.mil Rick Rassmussen - 206.762.3700, [14]RickR@rassmussenco.com Appendix B Submarine Cable Appendix C Acoustic Frequencies (kHz) RX TX EN REL 1. Frame release 9.5 9.0 C D 2. Frame TR6000 #1 10.0 9.0 3. Frame TR6000 #2 8.5 9.0 B 4. Frame acoustic valve 12.0 8.0 5. Lowering release 9.5 12.0 C D 6. Wire basket release #1 8.5 9.5 G C 7. Wire basket release #2 8.5 9.5 G D Appendix D Appendix E Hydraulic Winch and Power unit: The winch is power in / power out, so it would be SLOW - averaging about 65 FPM. You would need to watch the heat generated when spooling off 3,500 ft. of rope with little or no weight. 1 Used Lantec 750 with 163 drum, each Hydraulic Winch Bare Drum Pull (90 GPM @ 2,500 PSI) NOTE: Image of 59,850 lbs @ 51 FPM shown is a Approx Drum size Flange=48" representative Barrel=24" Length=40" sample of the Drum capacity=5300' of 7/8", equipment 4410' of 1", model. Approx Dimensions are L=82-7/8"xW=54-1/2"xH=50-1/4" Weight = 6,140 lbs W/ Ratchets and Dog Purchase Price/Insurance $68,00000 each Value: Monthly Rental Rate: $3,600.00 each Delivery: Currently in stock FOB: Seattle, WA 1 each Used Diesel Hydraulic Power Unit (DHPU) 225 h.p. Caterpillar Model 3216B Industrial ATAAC Engine Tier II Approx output of 100 GPM @ 2,500 PSI All components (power unit, fuel tank, reservoir, pumps, filters, valves, etc.) mounted onto one common NOTE: Image shown is skid with steel tube a representative headache rack and sample of the lifting eyes. equipment model. Unit filled with biodegradeable hydraulic fluid. Remote joystick controls (allows for operation of winches up to 20 ft. from power unit). Dimensions are L=12 ft. x W=4 ft. x H=7 ft. Weight = 7,900 lbs Purchase $58,500.00 each Price/Insurance Value: Monthly Rental Rate: $3,500.00 each Delivery: Currently in stock FOB: Seattle, WA Other Notes: night work anticipated SSSG Tech: sssg @atlantis.whoi.edu Navy Clearance Status: Check List: Required? Comments US Customs Form No Diplomatic Clearance No Isotope Use Approval No SCUBA Diving No Last Modified: 06/12/2008 References Visible links 1. mailto:marineops@pshinc.net 2. mailto:lmarconeri@knutsenins.com 3. mailto:mercer@apl.washington.edu 4. mailto:fred@apl.washington.edu 5. mailto:lyle@apl.washington.edu 6. mailto:boget@apl.washington.edu 7. mailto:andrew8@apl.washington.edu 8. mailto:monty@apl.washington.edu 9. mailto:ecaporelli@whoi.edu 10. mailto:bcostell0@whoi.edu 11. mailto:dfisichella@whoi.edu 12. mailto:marineops@pshinc.net 13. mailto:livinge@onr.navy.mil 14. mailto:RickR@rassmussenco.com