U.S. NAVY SALVAGE REPORT DEEPWATER HORIZON ... - ESSM
U.S. NAVY SALVAGE REPORT DEEPWATER HORIZON ... - ESSM U.S. NAVY SALVAGE REPORT DEEPWATER HORIZON ... - ESSM
Chapter 5: Operations Resource Coordinator proposed smaller sport fishing boats and pleasure craft but after clarifying the requirements, appropriate commercial-duty craft were obtained. In Grand Island, LA, 2 of 4 skimmers operated in free skimming mode. That is, they operated without tow boats but under their own power with rigid collectors spread ahead of the sorbent belt. This mode was effective in narrow channels and tight harbors and afforded a means to collect oil that had naturally pooled in pockets. 5-2.3 Management Challenges With eighteen Marco skimmers deployed, servicing the skimmers became a challenge. Oil had to be offloaded, supplies provisioned and mechanical servicing performed. SUPSALV provided these services using the Offshore Support Vessel (OSV) BAYOU BEE which was put on contract on 12 June. This vessel, provided by the Federal Resource Coordinator, can be seen in Figure 5-8. She was configured and equipped with SUPSALV vans containing spares and servicing equipment, a mobile crane capable of lifting a MARCO skimmer on deck, and the means to take the skimmer’s oil from the towed bladder or the 40 bbl onboard sump. Employing the BAYOU BEE proved to be a effective means to provide service to a widely distributed fleet of skimmers. Figure 5-8. Stern deck of OSV BAYOU BEE configured with crane and shop vans to provide mobile MARCO Class V skimmer maintenance. A second challenge SUPSALV faced in managing the operation of 18 MARCO skimmers across three states was the unfamiliarity of others in the response organization with the MARCO 5-8
Deepwater Horizon Oil Spill Response skimmer system and their tendency to request employment in a manner incompatible with the system’s capability. It was expected the MARCO systems could be moved around and reassigned great distances from their base of operations. In reality, these vessels move very slowly and traveling great distances exceeded what a skimmer could accomplish in a day and afforded no opportunity for crew rest. On 15 June a vessel assigned to the Pensacola’s Task Force 3 was moved by inexperienced tow boat operators without the ESSM skimmer crew aboard. The maneuvering resulted in capsizing the skimmer and placing it out of commission for the remainder of the operation. After that event, the SUPSALV team prepared a Concept of Operations (CONOPS) guide for MARCO Class V skimmers which explained the capabilities and limitations of the systems. Once ICS managers were provided these operations guide, a better understanding of their employment was achieved. A copy of the CONOPS guide is provided in Appendix A. A more detailed list of MARCO skimmer operational issues and observations is provided in the DWH Lessons Learned document, Chapter 7. 5-3 Open Ocean Skimming 5-3.1 Systems Used SUPSALV deployed two types of Vessel of Opportunity Skimmer Systems (VOSS) to the Gulf of Mexico. Five total systems were deployed, four NOFI High Speed Current Busters and one MARCO Class XI skimmer system. A basic description of these systems follows: MARCO Class XI System Sorbent Belt Oil Skimmer System. The MARCO Class XI consists of a filterbelt module, an induction pump, a squeeze roller assembly, and an offloading pump. The skimmer assembly is designed to be towed through spilled oil and pick up the water and oil emulsion. As the mixture flows up the filterbelt, the oil and water separate. The water passes through the belt while the oil and debris continues on. A scraper located at the top of the belt scrapes off solid debris and heavy oil, while the oil entrained in the belt is forced out by a squeeze roller. The oil then drips into a hopper, where it is eventually pumped to a support ship or other vessel by the offloading pump. Other major components include components include: two 55’ sections of standard 42” boom to herd the oil toward the skimmer belt, an outrigger assembly for separating the outboard end of the boom from the hull of the ship, a hydraulic power module to provide hydraulic power for the skimmer and pumps and a knuckle boom crane used to lift and maneuver the system components. 5-9
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Chapter 5: Operations<br />
Resource Coordinator proposed smaller sport fishing boats and pleasure craft but after clarifying<br />
the requirements, appropriate commercial-duty craft were obtained.<br />
In Grand Island, LA, 2 of 4 skimmers operated in free skimming mode. That is, they operated<br />
without tow boats but under their own power with rigid collectors spread ahead of the sorbent<br />
belt. This mode was effective in narrow channels and tight harbors and afforded a means to<br />
collect oil that had naturally pooled in pockets.<br />
5-2.3 Management Challenges<br />
With eighteen Marco skimmers deployed, servicing the skimmers became a challenge. Oil had<br />
to be offloaded, supplies provisioned and mechanical servicing performed. SUPSALV provided<br />
these services using the Offshore Support Vessel (OSV) BAYOU BEE which was put on contract<br />
on 12 June. This vessel, provided by the Federal Resource Coordinator, can be seen in Figure<br />
5-8. She was configured and equipped with SUPSALV vans containing spares and servicing<br />
equipment, a mobile crane capable of lifting a MARCO skimmer on deck, and the means to take<br />
the skimmer’s oil from the towed bladder or the 40 bbl onboard sump. Employing the BAYOU<br />
BEE proved to be a effective means to provide service to a widely distributed fleet of skimmers.<br />
Figure 5-8. Stern deck of OSV BAYOU BEE configured with crane and shop<br />
vans to provide mobile MARCO Class V skimmer maintenance.<br />
A second challenge SUPSALV faced in managing the operation of 18 MARCO skimmers across<br />
three states was the unfamiliarity of others in the response organization with the MARCO<br />
5-8
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