A trap that fails open blows live steam to the condensate line continuously; a trap that fails closed waterlogs the machine and kills the drying rate. In a mill with hundreds of traps, an unsurveyed population typically has 15–25% failed units — an invisible, permanent fuel bill.

Gate valves used to throttle steam or condensate cut a groove across the seat faces. Once wire-drawn, the valve never shuts tight again and the leak grows every month.

Thermic-fluid and high-temperature steam service cycles the stuffing box. Standard packing hardens, the stem scores and hot oil weeps onto lagging — the most common ignition path in a finishing department.

Caustic soda, hydrogen peroxide, acetic acid and hot dye liquor destroy general-purpose bronze and unlined iron trim in months, first as seat leakage and then as body wall thinning.

Any branch longer than roughly three pipe diameters holds water that never gets flushed or sanitised, and biofilm forms there. It is the single most common finding on a water-system audit.

Stainless surfaces in hot high-purity water develop iron-oxide rouge, which discolours the loop and eventually contaminates product contact surfaces.

Cold condensate left in a header is fired down the line when steam is admitted. The shock breaks valve bonnets, gauge glasses and gasketed joints — usually at 6 a.m. on a Monday.

Ordinary gate valves in effluent service will not close once fibre, sludge and grit pack the seat pocket, so a tank cannot be isolated for cleaning.

Feed, circulation and effluent pumps run off their duty point after piping changes; the result is cavitation, seal failure and impeller erosion within a season.

In pharma, a valve without a material certificate is a finding. In export textiles, a buyer audit asks the same question about the effluent line. Un-documented parts fail the paperwork, not the pressure test.