Page 122: of Offshore Engineer Magazine (May/Jun 2015)

121 123

OFFSHORE DENMARK its ability to meet the operator’s require- ments, including a stipulation that it would run in the subsea environment without main- tenance for 20 years, has been validated in the laboratory.

“Using the SHPU, which really will be the ? rst of its kind, means the umbilical to the

Christmas tree only needs to house commu- nications and power,” says Michael Klysner,

Danfoss High Pressure Pumps global direc- tor of oil and gas. “Everything else is catered for on the seabed, meaning a much smaller, simpler and cheaper umbilical—reduced from around 25cm in diameter to about 7cm.”

Work is continuing on the development of international standards for this subsea tech- nology, but no other pump is quali? ed to the exacting Statoil criteria or able to ful? l the

API 674 and 675 standards and the relevant

NORSOK speci? cations, he says.

Each pump has pistons running forward and backward against an angled swash plate with integrated port and valve plates control- ling ? ow in and out of the assembly. When the swash plate pushes the pistons up, pres-

Photos from Danfoss.

Chemical Inhibitor system. surized ? uid is pumped out of the bore.

“Our pump is proven to work in extreme circumstances and hostile environments,”

Klysner says. “Compared to competitors’ topside units, it’s much smaller and lighter.

Danfoss driving subsea

It weighs just 275kg compared to 25-tonne and uses 20 times less space.”

In 2005, Danfoss took the axial pump pumping technology principle and adapted its equipment in line with the international API 675 and 674

The subsea factory could be standards.

here sooner than many believe “Our track record is encouraging,” he says. and Danish ? rm Danfoss is “The ? rst API-standard pump was commis- sioned in a closed-drain system in Vietnam helping drive the innovation in 2007 and has not needed maintenance that will make it happen. Emma since.”

Gordon reports.

He adds that discussions are underway

MAG-Drive pump. with two operators working together to anish pumping technology is at the subsea Xmas tree valves. modify the pumps for subsea chemical injec- forefront of industry e