Total Hydraulics congratulate SHIPCO on the successful launching of the the "PT Mary"
DESIGN – INSTALLATION SALES AND SERVICE
TOTAL HYDRAULIC SERVICES LTD Phone 09 273 9142 or 021 930 973 email us at john@hyraudlics.net.nz
Comfy accommodation for four
Note the new
central hook position
7m beam and drawing 2.7m aft, she takes up a fair hunk of water space and makes sure she has a good grip on it as well. Her design incorporates a heap of new features not seen before in tugs of this size, with many of her innovations leading the way in new tug and towboat development in this part of the South Pacific. Her twin Cummins KTA 19–M3, rated 447kW (600bhp) each at 1800rpm, are air-started and keel-cooled. They drive through detached model W 1800 ZF 6.16:1 island-mounted gearboxes connected via a Centa CX-55-LFS2 input coupling. Another significant difference is that the propeller shafts are of mild steel running in oil-lubricated bronze bushes driving twin 1494mm-diameter four-bladed manganese bronze propellers with a blade skew of 20 degrees. Engine and gearbox control is by a three-station ZF controller with one MC2000 and two 760 control heads. The propulsion train is remarkably free of vibration both ahead and astern and at all speed ranges, giving a no-load service speed of 10.5 knots.
The main engines are mounted on LO-REZ BR4LS spring-type vibration isolators. They have a high load capacity, incorporating safety limit stops and neoprene dampers to prevent excessive vertical or rocking motion of isolated machinery. The exhaust pipes and mufflers are also resiliently mounted, so the overall result is very good noise control.
Electrical power is generated by two Cummins generator sets. One genset, a keel-cooled 6B-CP80DM/5 rated at 80kW 380 volts 50Hz and with electric start, is for general on-board power. The other, larger genset, a keel-cooled and air-started 6C-CP136DM/5 rated at 136kW 380 volts 50Hz, supplies the power to drive the towing winch.
Although her propulsion is by twin screws through
Survitec Group RFD New Zealand Limited
Head Offi ce, 30 Hargreaves Street, St Mary's Bay, Auckland 1140, PO Box 2386, New Zealand
Tel: +64 (0)9 373 2019 / Email: sales@rfd.co.nz www.rfd.co.nz / www.survitecgroup.com
MARINE ELECTRONICS SPECIALISTS
Proud suppliers and installers of electronics equipment to the PT Mary
• Design and specifi cation • Supply of all leading brands • Installation – commercial and recreational vessels • Service and repairs
225 Lower Port Road, Whangarei Ph: (09) 438 4644 Email: info@steelcom.co.nz
September/October 2012 Professional Skipper 9
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