Steam System Safety Check

This checklist is one step in the Pressure Systems and Refrigeration programme. Using it for work that belongs to a neighbouring template — the written scheme, the attendant log, or a cylinder check — produces records that are hard to report on later and that dilute the two failure modes this check is built to catch.

ISO 45001 cl.8.1 requires operational controls that eliminate or reduce OH&S risk from plant and equipment, and for a steam-raising boiler those controls are physical: level protection, pressure relief, flame supervision and water chemistry. The clause map below ties each control to the section that actually verifies it.

Steam boilers are one of the few plant categories almost every jurisdiction regulates directly, because the consequence of a low-water or over-pressure event is catastrophic rather than gradual. The three regimes below shape how this check is scoped and what a regulator expects to see behind it.

Filling in every field is mechanical. The judgement calls below are what decide whether a completed check would actually hold up if a boiler house incident were investigated afterwards.

The deficiencies that recur across steam system checks cluster around the same handful of devices, almost always because a test was assumed rather than performed.

A boiler tripped on low water mid-shift after the feed pump seal failed silently. The investigation pulled the last three Steam System Safety Checks: all three had Feed Pumps Working marked 'One working' — a Marginal-equivalent result — with no Finding raised and no Action Required set to Yes, because the boiler kept running on the second pump each time.

Nothing on the form was falsified. The checklist simply let three consecutive partial failures of the same component pass individually, because each one in isolation scored above the fail threshold. The fix adopted afterwards was a standing rule: two consecutive non-'Both working' results on the same asset auto-raises a finding, regardless of the score.

The form is the easy part. Keeping the check tied to the actual scheme interval, catching a Marginal result before it becomes a Fail, and holding the second signature to a real independent review is the work that actually slips.

KnowSafe

Holds the steam system safety check against the written scheme's intervals, flags devices left on 'Not due' too long, and keeps the finding-to-closure chain intact.

KnowMaintain

Links the check's findings to the boiler's maintenance history, so a recurring feed pump or valve issue is visible before it becomes a repeat finding.

KnowTrain

Confirms the attendant's certification is current at the moment the check is signed, rather than leaving that cross-check to memory.

Ella

Rolls check completion and open findings into one view across every boiler on site, and holds every write for your approval before it touches a record.

Gauge glass

The sight glass on a boiler shell that shows water level directly; blowing it down clears any blockage that could make the reading unreliable.

Blowdown

Deliberately discharging a controlled amount of boiler water to remove suspended solids and sludge, and to prove level instruments respond correctly.

Total dissolved solids (TDS)

A measure of dissolved mineral content in boiler water; too high a concentration causes foaming and carryover into the steam system.

Relief device

A safety valve or bursting disc set to open automatically before pressure exceeds the safe working limit of the vessel.

Flame failure device

A safety control that shuts the fuel supply if the burner flame is lost, preventing unburnt fuel from accumulating in the combustion chamber.