“Valiant-class harbor tug”的意思、由来-开放百科全书

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Valiant-class harbor tug

释义

Design
Ships in the class
References

{{Infobox Ship Image

*Valiant*-class tugboats
Ship image=US Navy 100209-N-2143T-001 Rob Campbell, deputy program director of Navy Region Northwest Port Operations, delivers remarks during the activation ceremony for the new Navy tug boat Valiant (YT 802).jpg	Ship caption=Rob Campbell, deputy program director of Navy Region Northwest Port Operations, delivers remarks during the activation ceremony for Navy tugboat {{ship	YT-802} }}{{Infobox Ship Class Overview	Name=	Builders=J.M. Martinac Shipbuilding Corp., Tacoma, Washington	USA}}	Natick\|tugboat}}	Class after=	Subclasses=	Cost=	Built range=2009–2012	In service range=2009–present	In commission range=	Total ships building=	Total ships planned=6	Total ships completed=6	Total ships cancelled=	Total ships active=6	Total ships laid up=	Total ships lost=	Total ships retired=	Total ships preserved= }}{{Infobox Ship Characteristics	Hide header=	Header caption=	Ship class=Valiant-class Tugboat	453\|LT\|t\|0\|abbr=on}} (lt){{br}}{{convert\|581\|LT\|t\|0\|abbr=on}} (full)	90\|ft\|m\|abbr=on}} (LOL) {{convert\|82\|ft\|m\|abbr=on}} (LWL)	38\|ft\|m\|abbr=on}}	14\|ft\|m\|abbr=on}}	1800\|hp\|abbr=on}} each	Ship propulsion=2 × Schottel Model SRP 1012 z-drive	12.4\|kn}} (trial)	Ship range=	Ship complement=6	Ship notes= }}

The Valiant class is a class of US Navy yard tugboats that entered service in 2009. These tugs are designed to provide ship assist, barge and general towing, and escort services.^[1]

Design

Before committing to a new tug design, Navy Region Northwest upgraded two of the older {{sclass-|Natick|tugboat}}s,^[1] Menominee (YT-807) and Washtucna (YTB-826), with improved power systems and z-drive propulsion units. Experience with these and two other YTBs with improved winch and power equipment lead to the decision to build new tugs.^[1]

The Valiant class was designed by Robert Allan Ltd. and derived from their Z-Tech 6000 commercial tugboat design. The prime contractor for the first four class members was Pacific Tugboat Services of Long Beach, California. The builder was J.M. Martinac Shipbuilding Corp. of Tacoma, Washington.^[2]

Unlike previous classes of navy tugboats, the Valiant class employs z-drive propulsion units manufactured by Schottel. These SRP 1012 drive units can be turned through 360 degrees to provide thrust in any direction. The z-drive propulsion and the unique hull shape allow this class of tug to have roughly the same bollard pull ratings ahead, {{convert|92500|lb|t|abbr=on|0}}, as astern, {{convert|99205|lb|t|abbr=on|0}}.^[2] The z-drive propulsion units are powered by {{convert|1800|hp|abbr=on|0}} Caterpillar Marine 3512C V12 diesel engines.

For towing, Valiant-class tugs are able to run stern-first using the JonRie InterTech hydraulic bow winch. This "tractor" mode of operation is accommodated with a stern profile that is higher than the bow profile.^[3]

An electric powered tug is being considered as a way for the Navy to reach its 2020 fossil fuel reduction goals.^[1]

Valiant-class tugs have an extendable, pivoting brow for use when personnel transfers are required. There are four state rooms, 2 singles for the chief engineer and the tug master, and two doubles for the other crew members. There is also a galley and mess area. The deck house is well insulated to reduce vibration and sound levels in the accommodations areas. The pilot house is windowed all around.^[4]

Ships in the class

*Valiant*-class tugboats
Name	Launched
{{ship	YT-802\|3}	25 July 2009
{{ship	YT-803\|3}	21 November 2009
{{ship	YT-804\|3}	10 July 2010
Seminole (YT-805)	6 November 2010
Puyallup (YT-806)	29 September 2011
Menominee (YT-807)	3 December 2011

References

1. ^¹²³{{cite magazine|url=http://www.professionalmariner.com/American-Tugboat-Review-2012/New-Navy-tugs-have-the-finesse-power-for-a-wide-range-of-duties/|magazine=Professional Mariner|title=New Navy tugs have the finesse, power for a wide range of duties|last=Gauvin|first=Brian|date=3 July 2012|accessdate=2012-07-28}}
2. ^¹{{cite web|url=http://www.marinelog.com/DOCS/NEWSMMIX/2010feb00163.html|title=Navy puts first of new tug series to work|date=16 February 2010|accessdate=2012-07-28}}
3. ^{{cite web|url=http://www.workboat.com/newsdetail.aspx?id=4294987751|title=On The Ways January 2010|publisher=workboat.com|first=Bruce|last=Buls|date=1 January 2010|accessdate=2012-07-28}}
4. ^{{cite web|url=http://www.workboat.com/newsdetail.aspx?id=4294995953|title=Navy Zs The Navy finally adds new Z-drives to its Puget Sound tug fleet.|publisher= workboat.com|first=Bruce|last=Buls|date=1 June 2010|accessdate=2012-07-28}}

3 : Auxiliary ship classes of the United States Navy|Valiant-class tugboats|2010s ships

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