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.
Instrument Bottom Mounts
DeepWater Buoyancy’s BTM-AL50 bottom mounts are designed for ADCP deployment in shallow ocean waters, rivers, coastal areas, and anywhere else where the size and remote recoverability of the AL-200 and AL-500 TRBM are not required.
These rugged diver-serviceable tripods come ready to accept your ADCP and battery canister, and can be modified to fit CTD, wave / tide gauge, velocimeter or other instrumentation.
BTM-AL50’s are manufactured using 5000 series aluminum, galvanically-isolated fasteners, and are fitted with zinc anodes for superior corrosion resistance. The double axis gimbal keeps your ADCP oriented to vertical after deployment and is manufactured using ultra-high molecular weight polyethylene to deter marine growth.
The units' three foot pads are supplied with through holes for ballast or for spiking, depending on your application. Standard (10lb/4.5kg) urethane-coated ballasts are provided for each of the three legs. Additional ballast is available upon request.
BTM-AL50-A Welded Bottom Mount - Side View
BTM-AL50-A Welded Bottom Mount
BTM-AL50-A Welded Bottom Mount - ADCP Battery Clamp View
BTM-AL50-B Collapsible ADCP Bottom Mount - Open
BTM-AL50-B Collapsible ADCP Bottom Mount - Closed
BTM-AL50-B Collapsible Bottom Mount with Teledyne SentinelV ADCP and DeepWater Buoyancy Pop-Up Recovery Buoy System
DeepWater Buoyancy Pop-Up Recovery Buoy System mounted on leg of BTM-AL50-B Collapsible Bottom Mount 
DeepWater Buoyancy Pop-Up Recovery Buoy System mounted on leg of BTM-AL50-B Collapsible Bottom Mount 
BTM-AL50-A ADCP Bottom Mount - Gimbal Detail
BTM-AL50-B Collapsible Bottom Mount with Teledyne SentinelV ADCP mounted in the 2-axis gimbal.
BTM-AL50-A ADCP Bottom Mounts with Ballast
BTM-AL50-A ADCP Bottom Mounts
BTM-AL50-A ADCP Bottom Mounts in Crate for Shipment
Custom BTM-AL50-B Collapsible Bottom Mount ClosedRelated 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
-
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.
Learn Moredatasheet -
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.
Learn Moredatasheet -
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.
Learn Moredatasheet -
New ProductPop-Up Buoy Recovery System
DeepWater Buoyancy’s Pop-Up Buoy Recovery System (PUB) allows for direct retrieval of seabed packages, such as anchors, anchor lines, and bottom-mounted frames and instruments.
Learn Moredatasheet -
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.
Learn Moredatasheet -
ADCP Inline Mooring Frames
Our in-house engineering and metal fabrication capabilities can identify a standard frame for your application or customize one to suit your needs. Working in stainless steel, aluminum or titanium, we can get your frames in line.
Learn Moredatasheet -
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.
Learn Moredatasheet -
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.
Learn Moredatasheet - 3