INFORMATION FOR BUILT FLOATING FERRO-CONCRETE WORKSHOP

By Ivan Stoytchev
E-mail: ivan.s.stoytchev@gmail.com

Following the history, earlier concrete floating constructions dated to more than 100 years. On the other hand, we know that the concrete is the cheapest material for building of these structures.

Also considering the new wave of concrete floating constructions in a past 30 years, the latest news for implement of new concrete technology and modern design as floating bridges, floating docks, floating cities etc which means that the concrete floating constructions have bright future.

In regards with above I would like to share some info and my experience in Bulgarian Shipyards where I worked more than 16 years (from 1978 till 1994) and where have been built approx. 250 nos Floating Ferro-Concrete Workshops between year 1959 to year 1994.

For more details please refer to below information and Fig.1 & Fig.2 about these built floating ferro-concrete workshops.

TYPE OF VESSEL:

Non-self-propelled facility with ferro-concrete two decked hull, with forecastle, poop, transom stern and two-tier living accommodation steel superstructure amid ship.

DESIGNATION OF VESSEL:

For routine and medium repairs of floating facilities and hydro-engineering construction sites remote from inhabited areas.

Navigation Area: Black Sea, Sea of Azov, Northern Seas.

GENERAL PARTICULARS:

Length Overall 67.50m

Length between Perpendiculars 62.50m

Breadth 13.00m

Depth 3.70m

Draught 1.83m

Steel Superstructure Length 54.00m

Width 10.50m

Height 6.50m

Deadweight 112.00t

Cross Tonnage 2196.00 reg.tn

Crew 4

Management & Production Personnel 96

PROPULSION PLANT:

2 diesel-generators 225 h.p.

1 emergency diesel-generator

DECK MACHINERY:

2 Hall’s anchors x 500 kg each.

1 hoisting crane of lifting capacity 30.0 t.

1 cantilever crane of lifting capacity 1.0 t.

1 longitudinal telpher of lifting capacity 3.2 t.

There were design options for floating hotels, hospitals, car parks on base of the similar ferro-concreate hull.

Fig. 1

Fig. 2

Mr Ivan Stoytchev has graduated in Feb,1978 as a Naval Architect M.Sc., Technical University Varna city/Bulgaria. His professional career started at Burgas Shipyard Co.Ltd./Bulgaria after graduation and worked at yard till year 1994 as Lead Engineer and GM of Engineering Department.

He has been involved of the following projects:

137 nos Floating Ferro-Concrete Workshops.
More than 120 nos of Sectional Barges.
19 nos Sea Going Self-Propelled Hopper Barges.
7nos Tanker for Caspian Sea.

Since year 1994 till year 2018 he has joined Keppel FELS Singapore as Senior Engineer (Naval Architect) in Engineering Department and Deepwater Technology Group.

He has been involved on stability study design, calculation and inclining tests:

66 nos Jack-up various project.
25 nos Semi Submersible Units.
2 nos Floating Production Units.
2 nos Floating Heavy Lift Cranes (2000mt & 3200mt).
2 nos Floating Dry Dock.
Other various projects as LNG Container Ship, FPSO etc.

Other Responsibilities:

Involvement in Project Bids and Front End Engineering Activities
Lead the naval architecture engineering team.
Mentor and supervise graduate engineers.
Perform calculation, such as ballast condition, loading condition, stability & launching calculation for yard operation.
Resolving engineering issues encountered during construction of the vessels.
Review project drawings from Basic Designer.
Controlling and ensure the naval architecture documents are on schedule.

Professional Affiliations:

Member of The Society of Floating Solutions (Singapore).
Council Member (Chairman of SNAMES Magazine Publication) of “Society of Naval Architects and Marine Engineers – Singapore” (SNAMES).
Member of “Royal Institution of Naval Architects” (RINA) – UK/London.
Committee Member (Assistant Honorary Secretary and Social Chairman) of “Institute of Marine Engineering, Science and Technology” (IMarEST), Singapore – Joint Branch of RINA.