Fire Watch During Sprinkler Shutdown: Who's Watching Your Warehouse When the System Is Down

At 6:30 in the morning, I walked in and saw Lao Liu by the charging area, radio in hand, eyes on the trucks on charge. Day three of our sprinkler shutdown. This is fire watch during a sprinkler shutdown — and the fire watch warehouse sprinkler shutdown requirements behind it are why he was there instead of somebody "keeping an eye out" between other jobs. Let me be straight: on the days the sprinklers are down, the most dangerous sentence is "it's only a few hours, what could happen?" Fires happen in exactly those few hours.

A couple of falls ago, our Ontario warehouse planned a valve replacement. The contractor said half a day. We shut the valve at 10 in the morning and found the flange faces rusted worse than expected. The part had to come from another supplier, and half a day turned into the next day. Around noon, the fire department showed up for a spot inspection: how long has the system been down, where's your fire watch, where's the log? I couldn't answer one. We got off with a warning. From that day on: the moment the sprinklers go out of service, the fire watch plan starts. No waiting, no gambling.

When Does Fire Watch Start During a Sprinkler Shutdown?

Under NFPA 25, Chapter 15, the impairment program starts the minute the system goes out of service: name a coordinator, tag the system, notify the fire department, insurer, alarm company, and area supervisors, stage tools and materials. It runs from minute one.

The trigger is "more than 10 hours in a 24-hour period." NFPA 25 says that when a system is out more than 10 hours in 24, the coordinator must arrange one of four things: evacuate the area, provide an approved fire watch, establish a temporary water supply, or run an approved program to eliminate ignition sources and limit fuel. Of the four, fire watch is the realistic one for most warehouses: evacuation means shutting down, a temporary supply isn't something every building can hook up, and the ignition-control program needs approval.

Our house rule is stricter: if a planned shutdown runs past half a day, or we can't say when it'll be back, we post the watch. Repair estimates are never right, and if you wait until you're over the limit to call people, the gap is already there — the hardest thing to explain.

Burst pipes, frozen lines, equipment failure — NFPA 25 treats those as emergency impairments, same steps, except you're calling people out of bed at 2 a.m.

This past January at 2 a.m., a dry pipe above our cold storage froze and split. Within an hour the tag was up, notifications out, watch posted. The watchman walked the cold storage door in a heavy coat. A freeze break takes even longer to fix. For those days, the watchman was the only sprinkler still awake.

What a Fire Watch Actually Does

A fire watch person is not a security guard, not a doorman, and definitely not "some idle guy sitting there." Under the fire watch warehouse sprinkler shutdown requirements, watch personnel have no other duties. Their job is patrol, log, and report — nothing else.

Patrol means walking a fixed route, lap after lap: charging area, packing area, carton storage, cold storage door, any hot work site. Five stops, twenty minutes a lap. First lesson for a new guy: this isn't a stroll, it's hunting with your eyes and nose. Does the charging area smell scorched? Somebody smoking by the carton stacks? A camera can't catch most of that.

Logging means every lap leaves a record: time, route, findings, actions. That logbook is your proof. No log means no watch. Our logbook lives by the fire control cabinet; the watchman signs in after every lap. A lap with a problem gets more detail — time, place, who got called, how it was handled — then gets handed to the next shift face to face.

Reporting means getting the word out the second something's wrong. The watchman carries a way to reach the fire department directly — radio, phone, whatever — not "run back and shout." He also knows evacuation routes, which zone clears first, and how to brief arriving firefighters: which zones are dry, where the fire is, how many are inside. Rehearse it on a quiet day.

On staffing, I learned the hard way: we put a temp on nights to save money, and he fell asleep by the charging area. Since then, watch duty goes to experienced people only, or a veteran paired with a new hire. Shifts rotate, nobody pulls more than two nights in a row, and night shifts get an extra meal allowance. People aren't made of steel. Treat them like steel and the fire shows up while they're dozing.

What Has to Stop While the System Is Down

First, hot work either stops or gets tight control. Cutting and welding get postponed if we can. If we can't, there's a hot work permit and the watchman stays on site throughout, plus at least 30 minutes after the work ends. That half hour is when trouble shows up: a spark drops into a carton seam and smolders. The 30-minute post-work watch is a hard requirement for hot work fire watch, not something we invented.

Second, the charging area gets watched on its own. A truck on charge doesn't get left alone; full means moved off, no row plugged in all night. During a shutdown, we double patrols there.

Third, stop adding fuel to the dry zone. Cartons, pallets, packing material — nothing new goes into the area without sprinklers while the watch is on. What's there gets moved out if possible; the rest gets extra attention every lap. Stacking more fuel in there helps the fire build its own stage.

Fourth, the trucks at the door. No long idling in the fire lane, no queueing for unloading there either. If the lane is blocked, fire trucks can't get in, and the watchman can't run out to flag them down. On this one, he can wave a truck off without checking with me first.

Counterintuitive part: a fire watch person's most valuable asset isn't his eyes. It's his logbook and the word "dedicated." Plenty of managers decide the watchman is "standing around doing nothing" and hand him putaway on the side. Folks, that math is wrong. The moment the watchman picks up another job, he stops being a watchman — he's a putaway guy who happens to stand there. When a real fire starts and he's carrying a carton, he loses half a minute — and the warehouse pays for it. The rule that watch personnel have no other duties isn't paperwork. Fire doesn't wait. Saving one person's wages to bet the building is a bad deal.

The Day the Water Comes Back, Don't Rush to Stand Down

The repair is done, the valve is open — can we send the watchman home? Not yet. Restoration day has its own close-out routine, and no step gets skipped.

Open the valve slowly and check for leaks — slamming it wide open can blow a fresh joint right back open. One watches pressure; the watchman watches the repaired section for seepage. No leaks, then vent air, then confirm the valve is fully open. Then take the tags down, notify the fire department, insurer, and alarm company that the system is back, and file the log for the coordinator to sign off. Only then is the incident closed.

After the water is back, the watchman walks one more lap. A fresh repair has to prove it's really back: valve fully open, pressure normal, joint not weeping. That beats finding a flooded aisle next morning. One more lap, all clear, coordinator signs, done.

Call the insurer back too — both notices on file make any claims conversation easier.

Last word: a shutdown isn't scary because the system is off. It's scary when nobody's minding it. Name your coordinator, post your watchman, fill the logbook, close out the restoration — do that and you won't flinch when the fire department or insurer calls. Fire never negotiates on timing. On the days the sprinklers are down, the watchman is your sprinkler. That is the whole point of the fire watch warehouse sprinkler shutdown requirements. Look out for him, and he'll look out for your warehouse.

By Chen Feng, Warehouse Operations Manager