ReManufacture of all-weather rescue boat propeller shaft

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ReManufacture of all-weather rescue boat propeller shaft 2017-06-22T14:20:53+00:00

Project Description


SpiralWeld™ was contacted by an organisation that operates a UK wide fleet of all-weather rescue craft, completely funded by voluntary contributions.  They were searching for a more cost-effective option to purchasing new Propeller shafts as the short mean time to failure they were experiencing, factored with a large number of vessels, made for an expensive combination.  SpiralWeld offered a solution which was more cost-effective, had a shorter lead time and increased the mean time to failure of the Propeller Shafts.

How we helped

In conjunction with our client’s in-house engineering department, possible ReManufacture and ReManufacture plus options were discussed, and a selection of test pieces were prepared to examine the repair feasibilities.  The test pieces were then subjected to extensive and lengthy tests for strength, reliability and sea water corrosion.  The outcome of these tests showed the methods we had used reduced corrosion and erosion.  Furthermore using our extensive experience, we ascertained a solution to improve the crevice corrosion resistance characteristics of one of these Propeller Shafts.

We have helped restore Propeller shafts for three different classes of boat.  To give an idea of the pressures and strains the shafts have to endure, and consequently the high level of engineering required in recovering them, some specifications of the boat classes are listed:

Type of LifeboatLength of vesselEngine powerProp shaft length
Severn-class17.3 Metres2 Caterpillar diesel engines producing 1250 HP, at 2300 rpm4.3 Metres
Trent-class14.3 Metres2 MANN diesel engines producing 850 HP, at 2,300 rpm2.7 Metres
Tamar-class16.3 Metres2 Caterpillar diesel engines producing 1,001 HP, at 2,300 rpm4.1 Metres

In conclusion

Our success can be measured by the successful SpiralWeld™ ReManufacture of more than 300 Propeller shafts, and we are continually seeing increasing volumes of shafts for repair.  We feel proud knowing that our technology is helping the people who protect our British coasts.

Our recovery solutions are transferable to numerous other prop shafts from various types of vessels, and can also be utilized for several other marine components including; Rudder Stocks, Stabiliser Stocks, Stern Tube Seals (deep sea seals).  If you are looking for a more cost-effective solution in the short and long term then please do not hesitate to contact us.