Three Hours to Find a Hose: A Delta P Near Miss
By Ray Whitfield, ADCI-certified commercial dive supervisor. Reviewed by Amanda McCallister, editor.
Cathodic Protection & Anodes | Offshore & Subsea Diving Three hours. I've spent longer untangling a shot line, but those three hours on a February morning at a hydro intake on the Staunton River cost us the only safe window we had. The water was running gray-green, a foot above winter pool, and the rain from last night was still rolling in from the Piedmont. We had a permit to shut the unit down and rake the trash rack. The plant operator, a guy named Buck, had promised us four hours of zero discharge. The plan was simple: a diver would go down with a water jet powered by a 1-inch hydraulic hose, wash the rack clean, come up. The hose had to be the one with a 4-bolt flange on the pump end, and it wasn't in the tool trailer. Buck said the clock was running. That was the moment I should have called it.
Hour One: The Empty Bin
The trailer had everything we needed for a typical trash rack job. Spare helmet lens, two sets of wetnotes, an extra harness. That hose was the only piece not in it. We looked. Took everything out, put it back, twenty minutes. Then we looked again because when you're losing money, you don't believe your eyes. The bin was labeled '3/4-inch Jetting Hose' but it had a 1-inch hose inside—the wrong one. Somebody had been lax with the tags. Hour one taught me that a labeled bin is not a system. We didn't have a chain of custody for each hose. A grinder gets a tag, but a hose doesn't. That's a lie we all keep telling.
Hour Two: The Phone Call
The only other jetting hose in the company was on another job, 200 miles away. We called the dive supervisor there. He said they hadn't seen it. Then to be sure, he sent a tender to look in their trailer. Twenty minutes went by with the phone on speaker. We could hear the rain on their satellite dish. The tender came back and said no. Then the home office called back wanting to know why we were calling. That was another twenty minutes. The reality is, a two-person office can't track gear across three states on a clipboard. We needed a simple log-out sheet. We didn't have one. Hour two was the cost of not tracking our own equipment.
Hour Three: The Borrowed Hose
At the two-hour mark, Buck said he was going to have to bring the unit back online. I asked if there was any hose in the plant. He said no. Ten minutes later, his mechanic—who'd been in the turbine pit—came up and asked why we were packing up. 'The jetting hose,' he said. 'The one with the 4-bolt flange? Y'all left it in the fire pump room last October. We've been meaning to tell you.' It was sitting on a shelf under a tarp. We had it rigged and running in fifteen minutes.
The Near Miss
But the window was gone. The unit was back on line, and the discharge was pulling through the rack at maybe half full flow. The client wanted to dive anyway. I said no. He said the rack was only 12 feet deep and the diver could stay to the side. I had a new guy, two years in the field, who wanted to prove something. He said he knew how to approach from downstream. It was a mistake. He got a hand too close to a 4-inch gap where the seal had failed. The pressure differential pulled his glove and his whole arm into the opening. It held him. He couldn't pull free. The stand-by diver got to him in seconds and used his harness with a quick tug, but it took both of them to get his arm out. He was shaking for an hour afterward. The hose that took three hours to find cost us the one thing that keeps divers alive: a predictable current. We don't blame the hose. We blame the three hours that we spent managing things instead of managing the water.
Frequently Asked Questions
Couldn't you have used a different hose and fitting? No. The 1-inch line with a 4-bolt flange matches the high-pressure pump specific to that job. A 3/4-inch hose would have carried the water but not the flow rate, and the fitting wouldn't have mated. You adapt a hose to a pump and you risk a blowout at 3,000 psi. Why didn't you just cancel when you couldn't find the hose? Because the plant operator had a permit and a schedule. Hydro units don't shut down on a whim. And I still had the option to call it off. I didn't early enough because I believed we'd find it in minutes. The lesson is to set a firm 'off-hose' decision point before you start looking. What do you do differently now to prevent this? Every hose goes on a log-out sheet. It gets a tag, just like a torch cylinder. And before any dive where current is a factor, we check the discharge forecast and we set a hard abort time. If the gear isn't ready by that time, the dive doesn't happen.