PSA Polaris and PSA Capella were built by Cheoy Lee Shipyards, designed by Robert Allan as Z-Tech 5000 terminal tugs and adapted for Singaporean operations
Robert Allan’s Z-Tech 5000-design tugs PSA Polaris and PSA Capella were delivered to PSA Marine in Singapore on 26 October 2018.
The deckhouse and wheelhouse were restyled to improve visibility of deck operations. PSA Polaris and PSA Capella were built in China to Lloyd’s Register class for Singapore coastal service up to 30 nautical miles from shore.
Their Z-tech design is a combination of the best operational characteristics of both Z-drive tractor tugs and azimuthing stern-drive tugs. PSA Polaris and PSA Capella both have an overall length of 27.40 m and a moulded beam of 11.50 m with a hull depth of 5.03 m and a maximum draught of 5.25 m.
These 333-gt tugs each have an ahead bollard pull 52.0 tonnes, free running speed of 12.53 knots and can store 100 m3 of fuel oil and 23 m3 of potable water.
Main propulsion on PSA Polaris and PSA Capella comprises of a pair of Yanmar 6EY26W diesel engines, each rated at 1,530 kW of power at 750 rpm driving Schottel SRP 360 fixed pitch rudderpropeller Z-drive units. Electrical plant on board these tugs consists of two Perkins E70TAG1M diesel generator sets, each generating three-phase power output of 96 kW at 415 V and 50 Hz.
Their deck machinery incorporates a MacGregor hydraulic towing winch on the bow, spooled with 220 m of line on the working drum. There is also a Palfinger knuckle deck crane on the aft deck for line and equipment lifting.
PSA Polaris and PSA Capella both have fenders all around the main deck for handling ships of different sizes and types. At the bow there is one tier of cylindrical fendering at the main deck level and W-block fenders between the main deck and the knuckle at bow and stern, hollow square style fenders along the sheer lines of main deck, stem and skeg and more fendering at the stern.
They can accommodate a crew of six seafarers and comply with the Maritime Labour Convention 2006 rules. Each tug has a single cabin for the master and chief engineer, two double cabins on the main deck, with a pantry and mess room located on the lower deck.
A terminal and towage tug was also built to a similar design for Hong Kong-based South China Towing, also delivered in October 2018.
These Z-Tech designs were jointly developed by Robert Allan and PSA Marine in response to specific requirements and challenges of Singaporean operations.
The first Z-Tech tug was delivered in 2003. Since then, around 90 tugs of eight versions of the basic design have been built or are under construction worldwide.
In September 2018, PSA Marine began operating high-power escort tugs PSA Thor and PSA Hulk in Singapore. These LR-classed azimuthing stern drive tugs were built by PaxOcean Shipyard to Robert Allan RAmparts 3200 design with 82 tonnes of bollard pull.
PSA Thor and PSA Hulk each have a pair of Caterpillar 3516C diesel engines, Schottel SRP Z-drives and Cummins QSM11-M diesel generator sets.
Particulars of PSA Polaris and PSA Capella
Owner: PSA Marine
Builder: Cheoy Lee Shipyards
Type: Terminal tug
Designer: Robert Allan
Design: Z-Tech 5000
Length oa: 27.40 m
Beam, moulded: 11.50 m
Depth, moulded: 5.03 m
Maximum draught: 5.25 m
Gross Tonnage: 333
Bollard pull: 52.0 tonnes
Free running speed: 12.53 knots
Fuel oil: 100 m3
Main propulsion: Yanmar 6EY26W
Propellers: Schottel SRP Z-drives
Deck machinery: MacGregor
Deck crane: Palfinger knuckle
Class: Lloyd’s Register
Design: Robert Allan