Drilling products

Durafloat™ and Durafloat RIS™ (Residual Integrity System)

The demands placed on drilling riser buoyancy have increased dramatically as the industry continues its exploration and development of ever deeper waters.

 

Similarly, the requirement for ultra-safe modules has grown in response to the extreme conditions which are now commonplace in today’s operating environments.

Balmoral Offshore Engineering’s design team was tasked with the development of a high performance ultra-safe riser buoyancy system to accommodate and perform in the most arduous of conditions. The team created a specialised riser buoyancy series, Durafloat RIS, comprising a high impact protective skin and residual integrity system.

Significantly, Durafloat RIS is designed to minimise the risk of cracking and fracture while delivering safe high performance uplift.

Buoyancy plays a critical role in the dynamic performance of the riser string and Durafloat RIS is an important step forward for the industry. Its contribution to safety and performance should not be underestimated.

 

Balmoral drilling riser buoyancy modules - Songa

 

Balmoral drilling riser buoyancy safety design features

Durafloat RIS safety design features

 

 

External finishing

Drilling riser buoyancy operates in extreme conditions and must withstand harsh and constant handling. Durafloat modules benefit from an integral composite epoxy skin that delivers a robust impact resistant performance.

 

API 16F

Balmoral Durafloat RIS modules are designed, manufactured and tested in full accordance with API 16F.

 

Attachment methods

Balmoral Offshore Engineering offers strapping with stainless steel axis bars and stud bolts as standard attachments between module and riser. Further options are available including through bolts located in reinforced pockets or stainless steel U-bolts with enclosed Kevlar strapping.

Dependent on riser geometry these options can be located within the pitch circle diameter (PCD) of the auxiliary lines thus reducing the transverse bending moment on the buoyancy module.

 

Module stability

300mm flats are standard across the Durafloat range. This allows effective stacking in the yard and in the offshore operations environment.

A fully comprehensive handling and stacking manual is available from the company on request.

 

Flexural pads

Flexural pads are built into BOE buoyancy modules at strategic locations to ensure that excessive bending loads are not transferred from the riser to the module when lifted in the horizontal plane.

Balmoral drilling riser buoyancy flexural pads

 

 

Balmoral drilling riser buoyancy strapping detail

Durafloat RIS strapping detail

 

Colour coding

An international colour coding system exists for quick identification of differing depth rated modules. A typical example of this is shown below:

Colour coding standards  
Feet
Metres
 
Green
0-2000
0-610
 
Blue
2001-3000
611-914
 
Yellow
3001-4000
915-1219
 
Orange
4001-5000
1220-1524
 
Black
5001-6000
1525-1829
 
Red
6001-7000
1830-2134
 
Purple
7001-8000
2135-2438
 
Brown
8001-9000
2439-2743
 
Grey
9001-10000
2744-3048
 
Light blue
10001-11000
3049-3353
 
Tan
11001-12000
3354-3658

 

Module repair service

BOE offers a comprehensive global repair service for damaged buoyancy modules that includes repair of full breaks and rebuilding of missing sections.

The company’s skilled buoyancy refurbishment technicians are available for field work at most locations worldwide.