Safely Deploy the Buoy

Personnel safety should be the number one priority when deploying a buoy. It is essential to use the proper equipment (work boat, lifting rig, etc.) to deploy any buoy system. Buoy systems are heavy and personnel can quickly become entangled with mooring lines and anchors. Safety and flotation gear should be worn at all times when working on or near the water.

Remember to perform a complete system test on shore before deployment. Communication and sensor issues are much easier to troubleshoot before the system is in the water.

Setup the Sensor Mooring Line

Connect the buoy attachment chain to the top of the mooring line using the 3/8” bow shackle. The opposite end of the chain will be connected to a top side mooring eye. Connect the heavy chain to the bottom of the sensor mooring line using 1/2” bow shackle.

 

Typical sensor mooring line assembly used with NexSens data buoys

Figure 1: Typical sensor mooring line assembly used with NexSens data buoys

 

With the SDL500 data logger and sensors laid out on a flat surface, secure to the sensor mooring line using sensor clamps and plastic cable ties.

 

SensorMooringLine

Figure 2: Sensor mooring line

 

 

To prevent cable chafing, it is recommended that a cable bumper (T-Bumper) be used to separate the sensor cable from the sides of the counterweight. Position the bumper so that it will fit just inside the bottom of the counterweight (see drawing below).

 

T-Bumper in deployment pipe used to minimize cable chafing

Figure 3: T-Bumper in deployment pipe used to minimize cable chafing

 

With the SDL500 data logger and sensors properly attached to the sensor mooring line, the system is now ready to be lifted onto the work boat for deployment. Coil the sensor mooring assembly for convenient transport.

Prepare Buoy & Anchor Lines

Connect a short stainless steel line to the marker buoy using a 5/8” shackle with screw pin through the thimble (see below). Attach a 1/2” shackle to the opposite end of the line.

 

Mooring Components

Figure 4: Typical marker buoy line connected to NexSens data buoy

 

Connect the anchor, bottom chain and water column line using one 1/2″ shackle and one 5/8″ shackle.

 

Mooring Components

Figure 5: Typical anchor line connected to marker buoy

 

Attach Buoy & Anchor Lines

Before deployment, attach the buoy lines to two of the bottom side mooring eyes. DO NOT attach anchors, chain, and long mooring lines.

 

Data buoy shown with buoy lines attached to bottom mooring eyes

Figure 6: MB-300 Data buoy shown with buoy lines attached to bottom mooring eyes

 

Place the buoy in the water and allow the two marker buoy lines to follow. The data buoy and two marker buoys are now floating clear of the boat. Attach the closest marker buoy to the anchor line.

 

Anchor line connected to buoy line

Figure 7: Anchor line connected to buoy line

 

With the data buoy floating in the desired location, move the boat while paying out most of the anchor line and chain. Drop the first anchor.

Move the boat to the opposite side, and attach the second marker buoy to the anchor line. Move the boat while paying out most of the anchor line and chain. Drop the second anchor. This completes the two-point mooring.

Install Data Logger & Sensors

Open the tower to a horizontal position by unscrewing the tie-down bolts. Remove the stop bolts shown and slide the SDL500 into position. Then replace the stop bolts and reconnect the three MS4 connectors to the solar power pack cables.

 

Tower hinged back with data logger inside

Figure 8: Tower hinged back with data logger inside

 

Position the connectors outside of the buoy well as shown.

 

Underwater connections positioned outside of the buoy well

Figure 9: Underwater connections positioned outside the buoy well

 

Lower the sensor mooring through the center buoy well and connect the buoy attachment chain to a top side mooring eye.

 

Buoy attachment chain connected to top side mooring eye

Figure 10: Buoy attachment chain connected to top side mooring eye

 

Return the tower to the vertical position and secure the tie down bolts.

 

Complete mooring shown inside of data buoy, including buoy attachment chain connected to top side mooring eye

Figure 11: Complete mooring shown inside of data buoy , including buoy attachment chain connected to top side mooring eye

 

The data buoy is now deployed and operational.

 

REV: 13C11

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