In our experience, the overwhelming majority of fire pump failures we attend across Melbourne trace back to the same root cause: poor documentation and coordination at the very start of the project. We can only speak for Victoria — but after twenty years servicing fire pump systems across 500+ properties, the pattern is impossible to ignore.
How a fire pump actually ends up in your building
Victoria has two major suppliers of what the industry calls “pump skids.” A typical skid is a galvanised or powder-coated base carrying a fire pump controller (either imported from China or manufactured locally), a diesel engine — commonly a Chinese engine from Shandong province, sometimes a Titan or another Chinese brand, and occasionally an older Ford from the 80s, a Cummins from the mid-90s or early 2000s, or a Yanmar — plus a fuel tank and fuel lines, a direct or PTO coupling, and an ISO or DIN standard pump.
Here’s the problem. These pumps are specified at the start of construction, but the engineers often don’t specify the actual design or how they want the pump set configured. The pump company is left to its own devices.
The pump is then purchased by the plumbing contractor — who has no direct connection to the building surveyor, the engineering team, or in many cases even the builder. They’re an independent contractor chasing the best bang for buck, and they’ll often bundle the fire pump into one order alongside sewage pumps, stormwater pumps and hot water pumps.
The skid gets dropped off very early in the project. At the end of the job, the pump company comes back, commissions the diesel pump that’s been coupled up by the plumbers, and issues a compliance certificate — which the building surveyor generally accepts.
Through that entire process, the pump drawings frequently never reach the building surveyor. The engineers haven’t reviewed them. The plumber has no long-term interest in the development — as long as it meets the pressure and flow numbers, looks shiny and comes with a fancy user manual, everyone walks away.
AS 2941 is not optional
Here’s the bit that catches people out: AS 2941 is a legal requirement under the National Construction Code. It’s not referenced directly in the NCC — it’s a supplementary standard. If you look at how the standards relate under Schedule 2 of the NCC, the primary standard for hydrant systems, AS 2419.1, calls up AS 2941 for fire pumpsets. Likewise AS 2118.1 for sprinkler systems calls up AS 2941.1. Supplementary, yes — but every bit as enforceable as the primary standard.
The trouble is that pump suppliers generally have little interest in regulatory affairs under the NCC. Their expertise is pumps and diesel engines. So when the skid is installed, the things that sit around the pump — pump room temperature, room ventilation, drainage connections, exhaust connections — get little to no thought.
And these are the things that destroy fire pumps.
The five failures we see most
1. Drainage. We have seen buildings damaged — badly — because the drains simply can’t handle the flow produced during pump testing. Water from the annulus drain or the circulation relief valve overwhelms the drainage, and because the pump room is usually in the basement, it all runs to a retention pit whose sump pumps can’t keep up. This is an engineering failure, and it should have been picked up at commissioning.
2. Exhausts. Diesel exhausts are almost never sized correctly. AS 2941 includes an exhaust system sizing chart (Figure E1) that spells it out: the required pipe diameter depends on engine power, the length of the exhaust run, and the number of bends. The longer the run and the more bends, the bigger the pipe needs to be — and the jump is significant. An exhaust that would be fine at 5 metres straight out the wall can be badly undersized once it’s snaking 20 metres through a basement with five bends. Yet installers routinely match the exhaust to the engine’s outlet flange and call it done. The result is back pressure that overloads the engine, leading to turbo failure or worse.
3. No fuel–water separator. Whether the separator is strictly mandated by the standard is debatable — in our view it is, and if it isn’t, it should be. Without one, water sits in the fuel, microbes take hold, and the contamination destroys the injector pump and rubber seals. Nine times out of ten on the older pumpsets we inspect, there’s no separator fitted — and before you know it, bob’s your uncle, you’ve lost your engine.
4. Ventilation. Pump rooms are routinely handed over with the ventilation system never properly connected or commissioned. The engine overheats when it runs — and remember, these engines can start automatically for no apparent reason. By the time anyone notices, you’ve cooked the head.
5. Pressure and flow were wrong from day one. We regularly return to buildings five years after handover and find the pump was never correctly sized, because the sprinkler fitter never actually ran the hydraulic calculations properly. The pump has been quietly non-compliant since commissioning.
This isn’t just a list of problems — here’s the fix
When you’re ordering a fire pump:
Make sure your engineers are genuinely involved in the pump specification, not just the pressure and flow numbers. Get the pump drawings in front of your building surveyor so they can be reviewed and stamped before the skid is ordered. And engage an independent certifier or engineer to verify that the complete pump system — drainage, exhaust, ventilation, fuel system and all — is suitable for the environment it’s going into.
It’s the best insurance you can buy, and it costs a fraction of a cooked engine or a flooded basement.
Melfire Pty Ltd has serviced, designed and certified fire pump systems across Melbourne since 2004. We hold all three Victorian credentials required for the design, installation and certification of fire pump systems — VBA Building Design (Services) Reg. 100018, VBA Plumbing Reg. 124876 and ESV REC 20655 — and manufacture SmartGen fire pump controllers locally in Melbourne. For an honest assessment of your fire pump system, call 1300 134 971 or visit our Melbourne fire pumps page.