Whole Lotta Dredgin’ 12

Here’s where the “leverman” sits for a twelve-hour shift as the C. R. McCaskill slews port to starboard 400′ once each three and a half minutes.   Another way of saying that is  the dredge moves using a five-point mooring system: two swing anchors, two breast anchors and one stern anchor to move forward or back.  A different configuration uses a spudded idler barge;  in this case, the “swing” is longer and takes more more time.   Food gets delivered so that the leverman aka dredge operator can monitor all these screens and respond so that dredging can proceed 24/7 as long as equipment and conditions permit.  More on food later.

Slewing . . . drawing on cables attached to positioned anchors and pivoting on a stern point . . . requires that the 30” diamater hose be able to flex.  Hence, the easy curved slack before the piping to the beach.

The crewboat in the distance alternates between hydrographic survey work and other tasks.  More on that in a moment.  More crewboats in a future post.

Attachment at the stern is a ball and socket joint . . . like your hip.

Here’s the starboard GE engine, part of the power supply to the dredge.

Here is another view of the two huge hull-mounted pumps that do the work.

Another task of the crewboat is illustrated here:  recreational boaters sometimes allow their curiosity to override any sense of danger caused by a busy, slewing dredge.

The helicopter happened to be here on assignment to photograph the work from the air.

About the food, here’s  mission control presided over by Edwina Arthur, a member of the 30-50 person crew.

Food rules and pecking order are clearly posted.

Captain Randy Guidry, my host for this tour,  proudly displays the builder’s plate, Corn Island Shipyard in Indiana, where the hull was constructed.

As I stated in the previous post, McCaskill’s part in the dredging/beach replenishment has now ended and vessels and crew have moved south for the next job.

Many thanks to Captain Guidry, Jan Andrusky, and all the other fine folks at Weeks Marine for this tour.

All fotos, text, and (any inadvertent errors) by Will Van Dorp.

Whole Lotta Dredgin’ 11

Here and here are previous posts on a Rockaway Beach replenishment dredging operation that has now ended.   Sea Wolf is still local, but the vessel on the horizon (“atop” the red buoy) has now moved to southern NJ.  Remember, for most fotos, doubleclick enlarges.

Weeks’ Trevor was assisting in this project.

Also assisting was George W.

But here’s the powerhouse, the dredge.  Let’s take a tour.

In spite of about 16,000 total horsepower, C. R. McCaskill is not self-propelled.  To see what towed the dredge to the south, see the foto at the end of this post.    All that power moves the cutterhead on the submerged arm (called a “ladder”) that extends to the sand at the bottom of the Channel here.  At the top end of the ladder are two huge pumps (you could stand inside the pump housing) that suck the sand and whatever else off the bottom and send it as a slurry to a point on the beach some miles away.  Click here for a pdf that shows the beautiful (ok . . . roll your eyes) virgin red cutterhead with green teeth.    Each tooth weighs around 35 pounds!

Here inside the dredge are some interesting astounding facts about the machine.

See the sand colored building on the horizon off the stern of McCaskill?  That’s the area around 105th St. Rockaway Beach where the sand is headed through piping powered by this vessel.  The first few fotos in this post were taken at that beach.  There’ll be another Rockaway post soon.

Candace towed C. R. McCaskill south.  I missed her when she was in town, but John Skelson caught her here.  Click on the foto to see John’s complete shot.  Many thanks to John for use of that shot from his Flickr page.

All fotos by Will Van Dorp, except for the one shared by John Skelson.  For more info on each of the Weeks tugs, click here.  More McCaskill tomorrow.