Destec buys 90-degree Neeter Drive for ROV
A
Power Jacks product story
Edited by the Engineeringtalk editorial team
Apr 24, 2009
Power Jacks supplied a Neeter Drive bevel gearbox to Destec Engineering when the latter needed a 90-degree drive for its remote operated vehicle (ROV).
At a depth 3000 metres below sea level, clamp connectors on retrievable chokes are operated by ROVs.
The Series-39 gearboxes operate on chokes used on subsea installations worldwide in sea water depths up to 3,000m with operating temperatures of up to 200°C.
Most have inline drive-shafts for adjustment, however for some installations the clamp connectors adjusting the drive shaft need to be at 90 degrees for ROV access; this is where Neeter gearboxes are useful.
Retrievable subsea chokes are designed with a retrievable insert.
The choke body is mounted on the Christmas tree or manifold.
The insert is a unitised cartridge and actuator assembly, which is retrievable to the surface leaving the choke body subsea.
The clamp connector is the critical device that holds the cartridge in place.
It is a three-piece double-hinged single-bolt design based on field-proven hub/clamp technology.
This simple rotary clamp make-up can be operated either by a diver or an ROV.
The Power Jacks Neeter Drive bevel-gearbox is used for ease of access to the choke drive from above for the ROV to facilitate maintenance.
The Neeter Drive bevel-gearbox turns a mechanical drive-line though 90 degrees with one or more shaft outputs.
It is available in solid or hollow shaft designs.
Both types have been used on different clamp collar designs, with the ultra compact construction of the Neeter Drive range of gearboxes proving ideal when fitting them into restricted spaces.
For this application, a special high-torque, subsea variant of the Neeter Drive Range-N Series-39 gearbox was designed.
The gearbox features precision spiral bevel gears, reinforced drive shafts and special subsea sealing with pressure compensation connections.
The Series-39 gearboxes operate on chokes used on subsea installations worldwide in sea-water depths up to 3000M, with operating temperatures of up to 200C.
The choke is a demanding application that operates in extremely hazardous conditions.
It is designed and built using high erosion-resistance materials with a design life in excess of 25 years.
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