You hear odd noises, elongation occurs, and it’s probably time to replace or repair the deck fitting. When ball bearings are missing, a winch or sheave doesn’t spin like it should. If a brand new high-load, low-stretch line is purchased for a given application, it’s a good idea to check the fittings it is running through. If you’re stripping the cover on some of these lines to reduce weight, only do so on spinnaker sheets, spinnaker halyards, and other control lines where the load or use is low. New covers are even being made out of Spectra® and Technora®, which adds greater grip around winches and reduces abrasion to practically zero. Many high-quality constructions of Spectra® are being made. Spectra®- or Vectran®-based rope is a great option for this. In Grand Prix racing, just about all of the line on the boat should be stretch resistant with a strong breaking point. Polyester can be used in control lines and other lower load lines. Avoid using polyester for these high-load applications so that you don’t have to get extra-large diameters. Use a blended braid Vectran® or Spectra® line for the halyards, jib sheets, and guys. A blended double braid Beltran® or Spectra® rope is a better option than polyester braids for these high-load applications.įor club racing, ensure that the line has the proper break strength on higher load applications. With the high-load applications associated with larger cruising vessels, such as sheets and halyards, you’ll need line that can handle a heavier load than polyester braids can. If treated well, polyester braids for all or most applications are a good option. If you’re cruising on a budget, choose line with great durability and UV resistance. Furthermore, the commencement of each survey will be dependent on fair sea state conditions suitable for marine seismic acquisition, vessel(s) availability, client data schedule requirements and granting of approvals from the appropriate government bodies.In determining your rope priorities, start out by considering the type of sailing you’ll be doing. The MSS activity will also not occur during peak pygmy blue whale migration periods. The timing of commencement and duration of individual surveys have not yet been determined, but the first survey (once the EP is accepted) will not occur before Q4 2017. The operating pressure for the acoustic source will be approximately 2,000 psi with a maximum volume of 4,350 cubic inches.Timing of the ActivityThe Greater Exmouth EP is designed for a duration of three years. During the proposed activities, the survey vessel will traverse a series of pre-determined sail lines within the operational area at a speed of approximately 8–9 km/hour. The proposed MSS will be undertaken using a purpose-built, seismic survey vessel. No unique or unusual equipment or operations are proposed. Operational DetailsIn terms of technical methods and procedures, the proposed MSS will be similar to others conducted in Australian marine waters. Water depths throughout the operational area range from 33–3,300 m, and seismic activities will not occur in water shallower than 100 m, or within 12 km of the Glomar shoals. The Greater Exmouth operational area excludes WA State waters. The northeast corner of the operational area overlaps with the multiple use zone of the Argo-Rowley Terrace CMR and is ~50 km to the boundary of the Argo-Rowley Terrace CMR Marine Park zone (IUCN zone II). South of the operational area are the Montebello Islands Commonwealth marine reserve boundary (~28 km away) and Barrow Island marine management area (~80 km away). At the closest point, the southern boundary of the operational area is ~ 67 km from the nearest land (Hermite Island) and ~ 124 km from the mainland coastline (Dampier town). The Greater Exmouth MSS may be acquired as a single survey, or as separate surveys (not concurrently) depending on weather, vessel availability and regulatory and operator financial approvals. The Greater Exmouth operational area comprises of an area of approximately 105,600 square kilometres (km2) of Australian Commonwealth waters. In the North-west Marine Region (NWMR) offshore from Western Australia (WA), the geophysical company Spectrum Geo Pty Ltd (Spectrum) proposes to acquire multi-client marine seismic surveys (MSS) within the Greater Exmouth operational area.
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