For the next installment in our series of technical articles, Ryan Nicoll of DSA looks at controlling uncertainty in buoy drag coefficient when designing oceanographic moorings.
ADCP Inline Mooring Frames
ADCP Inline Mooring Frames are designed to allow ADCPs to be mounted in a mooring string, passing the mooring loads around the instrument. Standard designs accommodate a single high-frequency ADCP, a high-frequency ADCP with an external battery pack or two high-frequency ADCPs in an upward and downward-looking configuration. The largest versions support a single mid-frequency device.
Frames are manufactured with 316L stainless steel. The frames are then electropolished and fitted with replaceable zinc anodes for superior corrosion resistance. Upper and lower bails are fitted with isolation bushings and allow connection to the mooring line with standard shackles. The clamps are adjustable for ease of use with varying instruments and are lined with an elastomeric sheet to secure the instruments from damage, while isolating them from the frame.
Our extensive in-house design, machining, metalworking, and welding capabilities allow us to make an endless variety of these frames to support and protect not only ADCPs, but also a wide range of other instrumentation. DeepWater Buoyancy’s engineering staff will work with you to design the exact frame that best meets the needs of your equipment, pass through loads, and time at depth.
Inline ADCP Frame
Inline ADCP Frame Clamp Detail
Inline ADCP Frame Arbor Detail
Closeup of clamping details on a dual-ADCP Inline Frame featuring 316L SS construction and compliant rubber clamping surfaces.
End view of a dual-ADCP Inline Frame made from 316L SS.
End view of a electropolished, 316L SS, dual-ADCP Inline Frame.
DeepWater Buoyancy custom dual-ADCP Inline Frame. The frame is made of 316L SS and is equipped with zinc anodes.Related Media
Mooring Matters: Sustained Measurements of Crucial Ocean Currents – PART 2
Part 2 of Dr. Peter Spain’s article on the development of ADCP technology and the use of syntactic foam buoyancy in subsea moorings.
NEW Pop-Up Buoy for Sonardyne LRT
DeepWater Buoyancy, Inc. has developed a new Pop-Up Buoy Recovery System for the Sonardyne LRT Acoustic Release.
Related Products
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Instrument Collars
Designed for long term submergence, our instrument collars provide years of reliable service and stand up to rough handling during operations. Each yields the buoyant force needed for a rapid ascent and positive recovery without impairing the performance of the instrument. From shallow water surveys to ultra deepwater positioning, you can count on these collars to help ensure overall success in the field.
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UpdatedInstrument Bottom Mounts
Whether your bottom mount requirement is for a mid-frequency or high-frequency ADCP, we can accommodate you. These diver-serviceable units can be produced to accept your ADCP, battery, CTD, acoustic modem or other instrument. The popular BTM-AL50 is now offered in both welded and collapsible versions.
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Hydro-float® Mooring Buoys
DeepWater Buoyancy’s subsurface mooring buoys are more versatile and reliable than conventional hollow glass or metal floats. The buoys may be cast with through holes and instrumentation pockets on any axis without compromising their strength because of their solid construction. Clamps and mounting hardware can be added for any user-supplied instrumentation.
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Trawl-Resistant Bottom Mounts
These TRBMs may be deployed by free-fall, or by a diver or ROV. They have a double axis gimbal inside a buoyant recovery pod, and are designed to permit retrieval of all mounted instruments. An optional Spectra line pack can be provided for recovery of the base for turnaround deployments. Our TRBMs are available in depths of over 500 meters. We also offer disposable concrete bases.
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Spherical ADCP Buoys
Manufactured from high-performance DeepTec® syntactic foam and fitted with 316L stainless steel and titanium hardware, spherical ADCP Buoys are designed to outperform and outlast conventional mooring flotation. Available with depth ratings from 200m to 6000m, they require minimal maintenance and are extremely durable under the most rigorous deepwater conditions.
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Elliptical ADCP Buoys
These buoys are have the same rugged design as the spherical ADCP buoys, but have an elliptical shape for higher current applications. Available with depth ratings from 200m to 6000m.
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StableMoor® Mooring Buoys
For a more extreme current application, turn to the StableMoor® line of buoys. These unique ADCP buoys are customized for your particular application. Accounting for depth, instrument types and current, this design will give you stable data in unstable waters.
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New ProductMooring Line Cable Fairing
Under certain flow conditions, taut mooring lines can vibrate or “strum”. The strumming is caused by vortices that result from the water passing over the line diameter. Strumming not only creates cable fatigue, it can have a detrimental effect on instruments in the mooring string. Our cable fairings reduce strumming by eliminating this vortex action. The result is a reduction in both strumming and drag.
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