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Economic impacts of the offshore supply vessel shipbuilding market in the Gulf of Mexico

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Abstract

Offshore support vessels (OSVs) play an important role in the offshore oil and gas industry with significant benefit to the coastal communities that provide the labor and materials to construct, crew and support the logistics network. OSVs connect onshore material and equipment suppliers and offshore operators, and are known as the ‘trucks’ of the ocean. The purpose of this article is to analyze OSV shipbuilding and to estimate the capital, labor and geographic distribution of the industry in order to inform regional economic analysis and debates about the Jones Act and other US policies. OSV construction is heavily concentrated along the Gulf Coast of southern Louisiana and Alabama. From 2003 to 2010, a total of 429 OSVs were delivered by 35 US shipyards valued between US$900 and US$1200 million per year, approximately half of the total US commercial self-propelled newbuilding industry. Four shipyards accounted for about 40 per cent of deliveries and Louisiana captured about 70 per cent of the capital expenditures followed by Alabama (14 per cent), Florida (10 per cent), Washington (3 per cent) and Mississippi (2 per cent). Equipment is a major driver of material costs and links the OSV shipbuilding industry with the US manufacturing sector. Using US shipyard revenue per labor hour and production values, OSV construction employment in the US Gulf Coast from 2007 to 2010 is estimated between 4400 and 5400 people per year. Indirect and induced impacts from OSV construction are estimated using shipbuilding average multipliers between $2.6 billion and $3.5 billion per year.

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Notes

  1. The OCS is the area of federal offshore jurisdiction, between 3 and 200 nautical miles offshore for all coastal states except Texas and west Florida where the OCS starts nine nautical miles from the coastline.

  2. Vessels carrying merchandise between two points within the same country.

  3. Gross tonnage is a unitless measure of the volume of a vessel.

  4. Owner furnished equipment is often specialized mission equipment. For most PSVs and crewboats, owner furnished equipment is minimal; for DSVs, IMRs and WSVs, owner furnished equipment may be more substantial.

  5. Compensated gross tonnage is the gross tonnage multiplied by a vessel-class dependent factor.

  6. Two US-built IMRs, the Ocean Project and Grant Candies, are included in the sample. The Ocean Project is a small shallow water vessel, with a low normalized cost while the Grant Candies is a larger, more capable vessel with higher normalized costs. The two vessels account for the maximum and minimum normalized costs in the IMR sample, suggesting that the international data are within the range of US costs.

  7. This is broadly consistent with anecdotal reports. For example, from July 2001 to March 2004 C&G Boatworks delivered 12 crewboats and employed approximately 175 people during the period, giving approximately 77 000 man-hours per vessel. Similarly, Thoma-Sea Shipyard is building four, 300 ft PSVs over the next 3 years. Thoma-Sea has reported they will employee at least 130 people, with each vessel requiring at least 200 000 man-hours of labor (Davidson, 2004; Schmidt, 2010).

  8. E=L(B+T)+0.85L(DT)+0.85∑l1h1+0.75∑l2h2, where L is the ship length, B is ship beam, T is ship draft, D is ship depth, l1 and h1 are the length and height of full width superstructures, and l2 and h2 are the length and height of houses all measured in meters (Molland, 2008).

  9. The block coefficient is a measure of the shape of a ship's hull and is defined as the ratio of the volume of the ship's underwater form to the volume of a circumscribing rectangular cuboid.

  10. The outfit mass of a vessel is estimated from W o =k′LB, where L is the length and B the beam of the vessel and k′ is another vessel class-dependent constant. Machinery mass may be estimated as a function of the installed power: W m =9.38(P/N)0.84 + k′′P0.7 where P is the installed power of the propulsion machinery (in hp) and N is the engine rpm (Molland, 2008).

  11. For example, a vessel delivered in 2008 would be paid in installments from the time of the start of construction to its delivery.

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Kaiser, M., Snyder, B. Economic impacts of the offshore supply vessel shipbuilding market in the Gulf of Mexico. Marit Econ Logist 15, 256–287 (2013). https://doi.org/10.1057/mel.2013.4

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