OHL Gutermuth Industrial Valves GmbH
Helmershäuser Str. 9+ 12 · 63674 Altenstadt / Germany
Phone + 49. 60 47.80 06-0 · Fax + 49. 60 47.80 06-29
www.ohl-gutermuth.de · email@example.com
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„MADE IN GERMANY“ O H L G u t e r m u t hAcontrolandshutofftechniqueyoucanrelyon.
for the umbilical. For the main manufacturing phase of the fabrication
and for the final packing, the tube and the umbilical are spooled onto
a reel at a radius at which the tube will be plasticized. Typically, the
maximum level of plastic deformation allowed per spooling is around
2%. Increasing the bending capacity of the tube enables use of a reel
with a smaller inner core.
Results show that the main benefits in terms of bending radius are
for the larger seam-welded tubes. This could be explained by the fact
that the bending radius is driven by the wall thickness of the tube
and the nominal elastic strain. Due to the manufacturing process, the
yield strength of the seam-welded tubes is independent of the tube
size, something which is not the case for seamless tubes. This has
a significant impact on the project as all manufacturing design and
installation constraints on steel tube umbilicals are directly driven by
the properties of the largest tubes.
There are further potential benefits for the umbilical, such as fatigue
performance and the bend stiffener design. The increased bending
capacity of seam-welded tubes should lead to a significant reduction
in the bend stiffener size, although this still needs to be quantified
on a case-by-case basis.
The Glenlivet gas/condensate field is in block 214/30a, 35 km
( 21. 7 mi) east of the Laggan field in the UK’s west of Shetland area.
Glenlivet, in 440 m ( 1,443 ft) water depth, was developed jointly with
the Edradour field which is in shallower water, 17 km ( 10. 6 mi) to
the south. Both are tied back to the existing Laggan-Tormore subsea
infrastructure, and the commingled fluids from these three fields and
the Tormore field are processed at the onshore Shetland Gas Plant.
For the two-well Glenlivet development, the umbilicals provide
the required hydraulic, electric and fiber optic services along with
chemical treatment (scale and wax inhibitor). Corrosion inhibitor is
continuously dosed into the Laggan-Tormore MEG (monoethylene
glycol) system. The Glenlivet umbilical comprises seven 19.05-mm
nominal bore, seam-welded super duplex tubes, three 16-mm cables,
and three fiber optic cables. The umbilical was completed with an inner
sheath, an armor wire package, and a final outer sheath.
Vallourec seam-welded tube offered acceptable mechanical properties for the service conditions, client specifications, and industry
standards. The material yield stress value, higher than for an equivalent
seamless material, resulted in a thinner tube wall thickness, and the
associated weight reduction brought down the cost of the manufacturing processes, logistics, and offshore installation.
TechnipFMC Umbilicals in Newcastle, northeast England, manufactured the Glenlivet umbilical using the company’s Vertical Helix
Assembly Machine (VHAM) in a single assembly. The VHAM has
high-capacity process bobbins for functional components that are
issued to the tube manufacturers to spool product onto. The weight
reduction provided by the seam-welded tubing allowed the full supply
of each tube to be provided on a single bobbin, removing the need
for tie-in welds to achieve the final length of roughly 18 km ( 11. 2 mi).
Prior to the start of this project, a Vallourec seam-welded tube was
included in a prototype manufactured on the VHAM. This was critical
to ensure full suitability of the tube throughout the manufacturing
process. Following manufacture, the prototype umbilical and tubing
Tables show (left) high pressure and burst resistance and collapse resistance (right) of three samples with the following dimensions: ( 1) 15. 25 mm outer
diameter (OD) x 1. 15 mm wall thickness (WT); ( 2) 28. 5 mm OD x 1. 45 mm WT; ( 3) 18. 1 mm x 1 mm WT. (Courtesy Vallourec Umbilicals)