In "Maritime engineering", we understand the planning, design, construction and finally the building of everything that floats on the water and/or has to do with the water.
When designing tugs and work boats, we rely to the experience and requirements of the company Hans Schramm & Sohn Schleppschifffahrt and develop practical solutions for maritime duties.
The NavTug® family currently includes several models, of which the NavTug® 18TS push and the NavTug® FlatTop are already operating successfully. NavTug® is our pride and demonstrates the strength and effectiveness of teamwork in the SCHRAMM group. The name NavTug ® is protected by a trademark.
Another development is our offshore wave lift OWL, which enables the safe surpassing on e.g. a wind energy plant.
One new design is the „NavTug® FlatTop“, a versatile and powerful assistance vessel similar to „MultiCat“ or „Euro-Carrier“ types.
In this area you will find our different ship designs with interesting information about our respective projects. About the navigation you can choose your desired ship.
The MAINTAINER closes the gap between small crew transfer vessels (CTV; < 30 m) and bigger offshore supply vessels (ASV/ PSV; > 50 m). Characterized by its spacious deck it can accommodate various fit-for-purpose containers suits for a diversity of maintenance jobs. In order to service the far-offshore windparks it features excellent sea worthiness combined with an endurance of 14 days. Thus, the new ship is designed to offer a wide range of abilities in combination with a reasonable and cost-effective size.
The MAINTAINER suits best for a variety of jobs:
For more information: MAINTAINER_brochure
The NavTug®FlatTop is a powerful handy sized multipurpose anchor handling and assistance tug with a large flat
deck area. It´s main scope of service is the assistance in any offshore and nearshore construction sites as well as
anchor-handling assistance for cable-laying vessels.
Additional information is available in the section downloads.
| Classification: | GL 100 A5 E RSA(200) TUG IW AH MC AUT |
| Flag | Netherlands |
| Tonnage: | < 400 GT |
| Length over all: | 31 m |
| Beam moduled: | 11,5 m |
| Beam over all: | 12 m |
| Depth Main deck: | 3,8 - 4,5 m |
| Draught, Design, Base Line: | 2,75 m |
| Draught, max. Base Line: | 3 m |
| Draught, max. with Skeg: | 3,35 m |
In December 2010, we could successfully lay the first NavTug® FlatTop on keel. It took place on Istanbul based Turkish yard SanMar. Beginning of 2012 the vessel was finished and – after sailing to Germany – was integrated to „Hans Schramm und Sohn Schleppschifffahrt” fleet.
Before keel-laying, extensive meetings regarding interfaces and design have been performed with the yard as well as initial and structural design works.
The „NavTug® FlatTop“ is a versatile and powerful assistance vessel similar to „MultiCat“ or „Euro-Carrier“ types. The main difference is that this vessel was developed in close discussions with German flag state authorities.
Due to its small draught, it can operate near shore in shallow water as well as offshore for miscellaneous assistance jobs in construction sites or as anchor handling vessel for cable-laying vessels in offshore wind farms.
This type of tug boat meets all international and national regulations for 24h service, especially regarding size of cabins and sound levels and –protection (< 60dBA).
With a length of 31,5 m and a beam of 11,5 m it has a bollard pull of 50 tons. The vessel has a big free working deck with a powerful deck crane and a double drum independent towing- and anchor-handling winch.
After commissioning, the tug will operate as an assistance vessel for the cable-laying barge „NOSTAG 10“.
The NavTug® 18TS push is a small, compact and powerful multi-purpose shallow water tug. It is designed, built and certificated as a seagoing vessel under GL-Class as well as inland navigation vessel.
Additional information is available in the section downloads.
| Lenght over all: | 18,50 m |
| Beam over all: | 6,20 m |
| Draught: | 1,85 – 2,00 m |
| Air Draught: | 4.3 m above DWL |
| Main Engines: | 2 x 441 KW |
| Propeller: | 1,3 m |
| Generator Power: | 27 kVa |
| Port Diesel : | 20 kVa |
| Speed: | 11 kn |
| Bollard Pull: | 15 t |
Our successful model NavTug® 18TS push was developed in 2006, initially on a beer mat. In autumn of 2007, the project really started, and in January 2009, the first NavTug ® named "Moin" was delivered to the customer, followed by "Christian" in May 2009.
The NavTug® 18TS push is designed as a small, compact and powerful multi-purpose tug and has the authorisitation as a seagoing ship under GL class as well as inland navigation vessel. It can take a variety of tasks in shallow waters and coastal areas, but is also suitable to push barges and pontoons in ports as well as on rivers. Due to this, it comes with a wheelhouse made from aluminum, which can be moved 4.4 m by means of a specially designed lifting device. The lifting device is patented. The closed circuit water lubricated shaft and the low emission engines ensures protection of enviroment.
Since 2009, both tugs are working for the Australian gas field „Gorgon“, to land Northsea standard barges in the protected area around Barrow-Island.
The NavTug®OA is a multipurpose powerful handy sized anchor handling tug with enlarged accommodation space
for 12 passengers. It´s main scope of service is the assistance in any offshore and nearshore construction sites as
well as cable-laying assistance and survey works.
Additional information is available in the section downloads.
| Lenght over all: | 34,5 m |
| Beam over all: | 10,5 m |
| Depth: | 3,0 m |
| Main engines: | 2 x approx 1300 KW |
| Generator Power: | 2 x 75 kVa |
| Port Diesel: | 27 kVa |
| Speed: | 14 kn |
| Bollard Pull: | 45 t |
The NavTug® OA is a handy-size shallow-water AHTS tug – practically almost the big brother of NavTug® 18TS push.
Strong and sturdy, yet clear and handy, he can take over a variety of tasks in offshore construction and act as a cable laying assistance ship.
He is small and shallow-draught enough to enter smaller ports and yet large enough to stay at sea for longer time and do heavy work. Beside the crew, he can accommodate up to 12 people e.g. Divers, service technicians, site managers or similar. He can also work as a supplier or serve as a traffic control vessel.
Scope of work:
Due to extension of 500 mm in lenght and 500 mm in breadth, it has more room for larger fresh water and seawage tanks, and slightly larger mess. This will allow longer operating hours and offer more comfort. The keel design was modified and now offers a better way to dry out, docking as well as space for pipes. The engine power was increased to provide a higher bollard pull. Based on this model, a version with a fixed deckhouse is planned.
Additional information is available in the section downloads.
| Lenght over all: | 19,30 m |
| Beam over all: | 6,70 m |
| Depth: | 1,85 – 2,00 m |
| Fixed point: | 4,3 m above DWL |
| Main engines: | 2 x 551 KW |
| Propeller: | 1,35 m |
| Generator Power: | 27 kVa |
| Port Diesel: | 20 kVa |
| Speed: | 11 kn |
| Bollard Pull: | approx 16,5 t |
Der NavTug®Worker 10 04 ist ein modernes Arbeits- und Festmacherboot. MAKKER 19 hat mit 10 m Länge und 4 m Breite einen Tiefgang von 80 cm. Die Bootshülle aus HDPE Kunststoff ist in Sandwich-Bauweise in Doppelhülle ausgeführt, die mit festem Schaum gefüllt ist und das Boot unsinkbar macht. Dank zweier Antriebsstränge mit zwei Motoren, ist es redundant einsetzbar.
Zusätzliche Informationen finden Sie im Bereich Downloads
| Länge über alles: | 10 m |
| Breite über alles: | 4 m |
| Tiefgang: | 0,85 m |
| Pfahlzug: | 2,5 t |
| Geschwindigkeit: | 12 kn |
| Antriebsleistung: | 2 x 184 KW |
Unser Erfolgsmodell NavTug® 18TS push entstand bereits 2006 zunächst auf einem Bierdeckel. Im Herbst 2007 wurde das Projekt ernsthaft angeschoben und im Januar 2009 konnte der erste NavTug® unter dem Namen „Moin“ an den Kunden ausgeliefert werden, gefolgt von „Christian“ im Mai 2009.
Der NavTug® 18TS push ist als kleiner, kompakter und kräftiger Mehrzweckschlepper konzipiert und hat sowohl die Zulassung als Seeschiff unter GL-Klasse als auch als Binnenschiff. Er kann vielfältige Aufgaben in flachen Gewässern in Küstennähe übernehmen, aber genauso auch Schubleichter und Pontons in Häfen und auf Flüssen schieben. Zu diesem Zweck verfügt er über ein Steuerhaus aus Aluminium, das mittels einer eigens entwickelten Hubmechanik um 4,4 m in der Höhe verfahren werden kann. Die Hubmechanik ist patentrechtlich geschützt. Die mit einer geschlossenen Wasserschmierung ausgestattete Wellenanlage sorgt zusammen mit den emissionsarmen Motoren auch noch für eine besondere Umweltverträglichkeit.
Beide Schlepper sind seit Sommer 2009 für das australische Gasfeld „Gorgon“ tätig, um Nordsee-Standard-Bargen im Naturschutzgebiet um Barrow-Island anzulanden.
The NavWorker10 is a small, strong, sturdy work boat. It is a further development of the mooring boats “Makkerboote” which operate reliably and successfully since years for the company Schramm.
Additional information is available in the section downloads.
| Lenght over all: | 10 m |
| Beam over all: | 3,50 m |
| Depth: | 1,30 m |
| Main engines: | 100 KW |
| Speed: | 8 kn |
| Bollard Pull: | 2 t |
In this section you will find our designs with interesting information about our respective projects.
The offshore wave lift (OWL) is a new developed Offshore-Access-System which provides a safe transfer from an offshore vessel to an offshore wind turbine or platform. The OWL was developed in cooperation of the company NavConsult and EnPro from Bremerhaven (Patent pending).
Currently, a fully functionatile model in a scale of 1:20 exists, which can be visited by appointment. The construction of a 1:1 prototype is planned.
Additional information is available in the section downloads.
Short description of the Offshore Wave Lift (OWL)
Advantages