c/dredge-operators

Shoutout to the old guy at the Port of Seattle who called my dredge a 'floating garden rake'

I was working a job on the Duwamish River last fall, running a 10-inch cutterhead. This older guy, a retired operator I think, was just watching from the dock for a good twenty minutes. When I took a break, he walked over and said, 'Son, you're running that thing like a floating garden rake, just scratching the surface.' He pointed out I was moving too fast for the material, leaving good pay dirt behind. He told me a story about a job in Alaska where they had to go so slow the barge barely moved for a week, but they got every last bit. It stuck with me because I was so focused on production numbers, I forgot the basics. Ever since then, I watch my spoil like a hawk. Has anyone else had a veteran give you a simple tip that completely changed your approach?

Serious question, has anyone else had issues with the new 'SureFlow' pump seals?

I mean, I just replaced a set on our main dredge in the Columbia River last month, and they failed after maybe 80 hours. Cost me over $400 in parts and a full day of downtime to swap them out again. Maybe it's just me, but I'm sticking with the old brand from now on. What seals are you all using that actually hold up?

Appreciation post: The difference a single new cutter head made on our 12-inch dredge after 800 hours of work

We swapped out the worn head for a new one from Thompson Marine last Tuesday and the suction jump from 14 to 22 inches of mercury in the same material was like getting a whole new machine, so what's the most dramatic single-part replacement you've seen on a rig?

Overheard a guy at the Tacoma marina say he runs his cutterhead at 80% max RPM for better slurry consistency in silt.

I tried it on a channel maintenance job yesterday and the pump definitely handled the load smoother... has anyone else found a sweet spot like that for different materials?

Got schooled by a river in Montana on suction hose placement

I was on a job clearing a channel on the Clark Fork River near Missoula last fall. We were running a 10-inch cutterhead dredge, and I had the suction hose set up like I always do, maybe a 15-degree angle off the bottom. The foreman, this old guy named Carl who's been at it for 40 years, just shook his head and told me to watch. He had me pull it back and drop it almost straight down, just a couple degrees off vertical. The difference was crazy. We went from pulling up mostly sand and small gravel to getting full bites of the bigger cobble that was actually blocking the flow. He said, 'You're not just vacuuming the floor, you're trying to peel the riverbed.' I'd never thought of it like that. It felt counterintuitive, but the production numbers didn't lie. Anyone else have a simple tweak like that that just flipped a switch for you?

Shoutout to the old guy who called me out on my spoil line setup

Honestly, I was running a 10 inch cutterhead in a muddy river bend last month and thought my setup was fine. This retired operator, Frank, came by the site and straight up told me my spoil line was too steep, saying 'Kid, you're losing half your slurry to splashback before it even hits the barge.' I moved the support pontoons closer, dropping the angle from like 30 degrees to maybe 15. Ngl, my material transfer rate jumped by at least 20% the next day. Has anyone else had a veteran point out something simple you totally missed?

Looking back on the old 8-inch cutterhead versus the new suction dredge choice

I mean, back in 2010 on the Columbia River project, the big choice was sticking with the old 8-inch cutterhead dredge we all knew or trying out one of the new suction models. The boss said the suction rig would be faster on the silt, but the cutterhead was a tank, you know? We picked the suction dredge. It was a learning curve for sure, the pump would clog if you weren't careful with the debris screen. After about three days we got the hang of it, and our yardage numbers did go up. But I still miss the solid feel and the deep rumble of that old cutterhead chewing through the bottom. Anyone else make a switch like that and have a favorite you still think about?

Question about pump packing on the old dredge in Galveston

Used to repack the main pump every 200 hours. Did it by feel, just tightened until it felt right. Had a blowout last month that cost us a full day. Now I use a torque wrench set to 18 foot-pounds and check it every 50 hours. Anyone else have a better method for keeping that seal tight?

Spent $150 on a 'universal' cutterhead bolt kit that was anything but

The threads were off by a quarter millimeter and I wasted half a Tuesday trying to make it work before giving up. Anyone know a good supplier for parts on an older IMS 7012?

So we pulled up a 1970s motorcycle from the bottom of Lake Washington

This was about three years ago on a big cleanup job near the I-90 bridge. We were running the 12-inch cutterhead, just chewing through the usual mud and old logs, when the whole barge shuddered like we hit a rock. The foreman yelled to stop, and we spent an hour trying to clear it with the grapple. When it finally broke the surface, it wasn't a rock at all. It was a rusted-out Honda CB750, handlebars and all, tangled in what was left of a dock rope. The crew just stood there staring at this bike dripping lake gunk. We had to call the local sheriff's marine unit to come check it out, and they just shrugged and said 'toss it in the dumpster.' Ever pull up something that made you stop and wonder what the story was?

The channel by the old mill used to be a silted-up mess for years, then we ran a 10-inch cutterhead through it for a month.

Warning: My suction line was vibrating like crazy and I was about to replace the whole pump

I was working on a small channel job near Mobile last week, and the main suction line started shaking so bad I thought the pump bearings were shot. I was ready to call for a new impeller assembly, which would have been a $2,500 mistake. My helper, a kid who used to work on shrimp boats, just pointed at the water and said, 'Boss, your cutterhead is buried in mud.' I'd been so focused on the pump pressure I didn't realize I'd let the ladder dig in too deep, starving the line of water and causing cavitation. Pulled it up a foot and the vibration stopped instantly. How often do you guys check your ladder depth versus just watching the gauges?

I finally stopped fighting the current on my old cutterhead dredge

For years on the Mississippi, I'd just crank up the power when the suction felt weak, thinking more force was the answer. Last month, my pump seized because I was ignoring the sediment density readings, which were showing way too much sand for the flow rate. The foreman pulled me aside and said, 'You're trying to dig a ditch with a firehose, slow it down.' Now I check the density gauge every 30 minutes and adjust the ladder speed first, not the pump. Anyone else have a simple gauge or check they started using that saved them a major headache?

Stopped fighting the tide for better dredge cuts

I used to try and force a straight cut line no matter what, even when the tide was pulling hard. On a job in Mobile Bay last fall, I was fighting a 3 knot current for hours, burning fuel and making a mess. My old boss told me to just go with the flow, literally. Now I set my cut line at a slight angle to the current, letting it help push the material into the suction head. It feels wrong at first, like you're not doing it right, but the cut is cleaner and the pump doesn't work as hard. I save about 15% on fuel on a bad tide day now. Anyone else try working with the current instead of against it?

I finally learned my lesson about cheap hydraulic hose after a $1200 pump failure

Bought a no-name hose for the main suction line on my cutterhead dredge last spring to save maybe $80. It blew out after 48 hours of runtime, dumping silt into the system and seizing the main pump. The repair bill was over twelve hundred bucks, not counting the two days of lost work on the channel project. That 'bargain' hose cost me more than a week's profit. Never skimp on the parts that handle the real pressure. Anyone have a go-to brand for 5000 PSI hoses that actually last?

That time I tried to clear a jam with a broom handle

We were pulling up muck from a channel near Mobile last fall and the pump intake got clogged with what felt like a whole tree root ball. The foreman was on lunch, so I figured I'd be smart and save time. I grabbed a wooden broom handle from the tool locker and started poking it down the access hatch. It worked for a second, then the pump suddenly caught and sucked that broom handle right out of my hands. I heard this awful grinding crunch from down the line. Shut everything down, and we spent the next four hours pulling apart sections to fish out about three feet of splintered wood. The boss just looked at the pieces and said, 'You know they make rods for that, right?' Learned my lesson: never use the wrong tool just because it's close. What's the dumbest quick fix that ever blew up in your face?

Pro tip: I keep seeing guys on the Lake Erie project run their cutterhead at full tilt in thick clay and it's killing their pumps.

Hot take: That silt dam failure in Galveston Bay changed my whole view on monitoring

We were running a 12-inch cutter suction dredge on a channel job when the whole containment area gave way overnight. Now I argue with my boss about checking the turbidity meters every hour versus trusting the automated alarms. Anyone else have a close call that made them change their routine?

My kid asked me what I do for work and I had to think about it

He's seven, and we were building a sandcastle at the beach last weekend. He asked, 'Dad, do you just move mud all day?' I told him, 'Sort of, but it's more like moving the whole ocean floor to build new things.' He looked at me and said, 'So you're a giant sea monster?' It made me realize I never explain the job in a fun way. How do you guys describe dredging to your family?

That moment when the suction line clogged on the Cooper River job

We were pulling up a lot of clay and old timber near Charleston, and the pressure gauge on the 10-inch line just spiked out of nowhere. I had to shut down the whole pump, then spend two hours with the crew pulling up sections to find a solid mass of roots and plastic bags jammed in the elbow joint. Has anyone else found a good way to spot those kinds of clogs before they stop everything?

My old way of checking the cutterhead teeth nearly cost me a day in Mobile

I used to just eyeball the wear on the teeth from the deck, thinking if they looked okay they were fine. That changed after a job on the Mobile River last spring when we hit a patch of old concrete and snapped three teeth in an hour. Now I make the whole crew do a full check with a gauge every single morning before we start the pump. We log the wear on each tooth in a book, and if any are past 60%, they get swapped right then. Anyone else have a strict rule like this, or do you run them until they break?

Shoutout to the old timer on the Klamath River who showed me the bucket trick

I was working a small suction dredge up there last fall, fighting with a jammed intake for the third time that day. This retired operator watching from the bank just yelled over, 'Son, you ever try a five gallon bucket with the bottom cut out?' He told me to put it over the suction head before you drop it in. It acts like a big strainer for the first foot of silt and stops the big rocks from getting pulled in right away. We tried it and didn't have a single clog for the rest of the week. Has anyone else used a trick like that for gravel beds?

Showerthought: My worst week on the water was when the old cutterhead on the 'River Queen' finally gave out near Paducah. Do you guys run them until they fail or do scheduled swaps?

That day on the Mobile River when the pump clogged with oyster shells

We were pulling up a ton of material, maybe 200 cubic yards, when the whole thing just stopped dead. Turns out a whole bed of old oyster shells got sucked in and jammed the impeller solid. Had to shut down for six hours to pull it apart and clear it by hand, which killed our schedule. Anyone else ever hit a patch of shells that bad?

Serious question, has anyone else had a dredge pump just... stop on them after hitting a weird patch of sediment?

I was working a channel in the Mobile River last month and the suction head jammed solid on what felt like a layer of old clay and gravel, something the survey didn't show. What's your go-to method for clearing a sudden blockage like that without tearing everything down?