ICGSMA Bulletin - Indian Coast Guard
ICGSMA Bulletin - Indian Coast Guard ICGSMA Bulletin - Indian Coast Guard
ICGSMA BULLETIN (JAN - MAR 13) direction which makes the ship turn. Most tunnel thrusters are driven by electric motors, but some are hydraulically powered. These bow thrusters also known as tunnel thrusters may allow the ship to dock without the assistance of tugboats, saving the costs of such service. Ships equipped with tunnel thrusters typically have a sign marked above the waterline over each thruster on both sides as a big cross in a red circle. TUNNEL THRUSTER Tunnel thrusters increase the vessel's resistance to forward motion through the water, but this can be mitigated through proper fairing aft of the tunnel aperture. Ship operators should take care to prevent fouling of the tunnel and impeller, either through use of a protective grate or by cleaning. During vessel design, it is important to determine whether tunnel emergence above the water surface is commonplace in heavy seas. Tunnel emergence hurts thruster performance and may damage the thruster and the hull around it. BOW AND TUNNEL THRUSTER INTRODUCTION D Singh, Adh (R) ICGS C - 149 A bow thruster or stern thruster is a transversal propulsion device built into or mounted to either the bow or stern of a ship or boat to make it more maneuverable. Bow thrusters make docking easier since they allow the captain to turn the vessel to port or starboard side without using the main propulsion mechanism which requires some forward motion for turning. A stern thruster is of the same principle, fitted at the stern. Large ships might have multiple bow thrusters and stern thrusters. Large vessels usually have one or more tunnels built into the bow, below the waterline. An impeller in the tunnel can create thrust in either BOW AND TUNNEL THRUSTER An insight to trouble shooters 16
ICGSMA BULLETIN (JAN - MAR 13) KNOW YOUR SHIP – ACV H-190 (a) Class of Ship : ACV (b) Yard and Yard No. : M/s GRIFFON HOVER WORKS LTD, UK, YAR 129 (c) Date of Commissioning : 19 Feb 2013 (d) Length Overall : Main Structure – 19.85 Mtrs, Hovering – 21.20 Mtrs (e) Breadth molded maximum : Main Structure – 08.70 Mtrs, Hovering – 11.30 Mtrs (f) Displacement in full load : 32.4 Tons (g) Tank Capacity - Fuel Oil : 3600 Ltrs - Fresh Water : 335 Ltrs (h) Endurance/Range/Designed Speed : 10 HRS @ 45 Knots (j) Main Engine : FIAT POWER TRAIN/IVECO ITALY (MODEL-VECTOR 08 FVAE2884AB201) (k) APU : LISTER PETTER , UK (MODEL-LPWS4) (l) Steering Gear : ACCU STEER INC. BELLINGHAM (m) Radar : M/s GEM ELECTRONICA, ITALY (n) Gyro Compass : M/s CDL, UK (p) Anemometer : M/s GILL INSTRUMENT LTD, UK (q) AIS : M/s TRANSAS LTD, SWEDEN ICGSMA BULLETIN The opinion expressed in the bulletin are the personal views of the authors, and do not reflect the official policy of ICGSMA. Contributions are welcome, as comments. The editorial board reserves the right to make any improvement / change in manuscripts. This unit accepts no responsibility for the facts made by the individual. Authors to acknowledge sources of information and provide list of references, if used. Period of Publication : Quarterly Address for Communication : The Editor, ICGSMA Bulletin, C/o BMU(CH), 56, SN Chetty Street Kasimedu, Royapuram, Chennai – 600 013 Telephone : 044-23460464 Facsimile : 044-23460477 Email : icgsma@indiancoastguard.nic.in, An insight to trouble shooters 17
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<strong>ICGSMA</strong> BULLETIN (JAN - MAR 13)<br />
KNOW YOUR SHIP – ACV H-190<br />
(a) Class of Ship : ACV<br />
(b) Yard and Yard No. : M/s GRIFFON HOVER WORKS LTD, UK, YAR 129<br />
(c) Date of Commissioning : 19 Feb 2013<br />
(d) Length Overall : Main Structure – 19.85 Mtrs, Hovering – 21.20 Mtrs<br />
(e) Breadth molded maximum : Main Structure – 08.70 Mtrs, Hovering – 11.30 Mtrs<br />
(f) Displacement in full load : 32.4 Tons<br />
(g) Tank Capacity - Fuel Oil : 3600 Ltrs<br />
- Fresh Water : 335 Ltrs<br />
(h) Endurance/Range/Designed Speed : 10 HRS @ 45 Knots<br />
(j) Main Engine : FIAT POWER TRAIN/IVECO ITALY<br />
(MODEL-VECTOR 08 FVAE2884AB201)<br />
(k) APU : LISTER PETTER , UK (MODEL-LPWS4)<br />
(l) Steering Gear : ACCU STEER INC. BELLINGHAM<br />
(m) Radar : M/s GEM ELECTRONICA, ITALY<br />
(n) Gyro Compass : M/s CDL, UK<br />
(p) Anemometer : M/s GILL INSTRUMENT LTD, UK<br />
(q) AIS : M/s TRANSAS LTD, SWEDEN<br />
<strong>ICGSMA</strong> BULLETIN<br />
The opinion expressed in the bulletin are the personal views of the authors, and do not reflect the<br />
official policy of <strong>ICGSMA</strong>. Contributions are welcome, as comments. The editorial board reserves the<br />
right to make any improvement / change in manuscripts. This unit accepts no responsibility for the facts<br />
made by the individual. Authors to acknowledge sources of information and provide list of references, if<br />
used.<br />
Period of Publication : Quarterly<br />
Address for Communication : The Editor, <strong>ICGSMA</strong> <strong>Bulletin</strong>, C/o BMU(CH), 56, SN Chetty Street<br />
Kasimedu, Royapuram, Chennai – 600 013<br />
Telephone : 044-23460464<br />
Facsimile : 044-23460477<br />
Email<br />
: icgsma@indiancoastguard.nic.in,<br />
An insight to trouble shooters 17
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