Alewijnse Marine successfully completes naval submarine pontoon Y8351

System integrator Alewijnse Marine has successfully completed the electrical refit of the submarine pontoon Y8351 of the Royal Netherlands Navy (RNLN). The pontoon has spent the last four months at Damen Shipyards Den Helder (DSDH) undergoing works to enable her to meet class specifications and additional customer requirements.


The pressure water pontoon Y8351 was built in 1986 for the intake and the transport of waste water from the pressure water tanks onboard RNLN’s submarines. With the vessel reaching the age of 30 in 2016, it became necessary to refurbish it for the next 15 years according to the requirements of Lloyd's Register and the Material Conservation Directorate (DMI), part of the RNLN.


Alewijnse was contracted by DSDH for the supply, installation, integration and commissioning of a number of critical electrical systems. During the project Alewijnse worked on a complete, new, high-level tank alarm system, tank sensors with PRAXIS software, a new main switch board providing current at both 400V/50Hz and 230V/50Hz, an explosion-proof starter panel, a shore supply panel and various facilities for lightning and heating. In addition Alewijnse, has made the entire electrical installation resistant to damage from dust, pressurised water and explosive force in line with IP66/67 and ATEX EX 11A T3 requirements.


The decisive factor for Damen Shipyards Den Helder in selecting Alewijnse for the electrical refit was the company’s excellent knowledge of RNLN’s vessels and their requirements. The successfully delivery of the submarine pontoon project shows again the mutual trust and strong relationship between Alewijnse Marine and Damen Shipyards Den Helder.


Damen Project Manager Xander Nienhuis commented: "We greatly enjoyed the experience of working with Alewijnse, and both we and the customer are very satisfied with the quality of the work done. The result is a vessel that is virtually as good as new despite the fact that it is actually 30 years old. This is a project that Damen and Alewijnse can be proud of.”

Alewijnse work planner Constantijn de Bruijn van Melis en Mariekerke was delighted with the outcome of the submarine pontoon refit: “Our dedicated team worked hard to deliver a first class service within a demanding time frame and co-operation with Damen working on the pontoon was excellent. Together we created a beautiful and future-proof product. A project to be proud of.”


The pressure water pontoon Y8351 is a so-called Bilge boat, an N-open type of tank vessel built for the intake and the transport of vessels’ oil and lubricant bilge water. The pontoon is 25 metres long, 6 metres wide and draws 3.30 metres. The pontoon has a tank capacity of 200 m³ with eight storage tanks of 25 tonnes each and buoyancy tanks at each end. It was originally designed for use in the New Port of Den Helder, the largest naval port in the Netherlands, but can be deployed elsewhere if required.


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