On a producing facility, the cost of a cut has little to do with cutting time. It is set by the permit system. A single flame cut inside a hydrocarbon facility can require gas testing, gas-freeing of adjacent equipment, isolation, fire watch during and after the work, and a hot work permit that competes with every other permit the shutdown needs. Multiply that by a few hundred cuts and the permits, not the cutting, become the programme.
What cold cutting removes
Ultra high pressure water jet cutting with abrasive sections steel without flame, sparks or meaningful heat. Because there is no ignition source at the cut, the hot work problem disappears rather than being managed. Work can proceed in explosive atmospheres and on equipment with residual product without gas-freeing every compartment first. On a live plant, that is routinely worth more to the client than the cutting itself.
The metallurgical bonus
The same physics that removes the ignition risk protects the material. Cutting cold means no heat affected zone, so the metallurgy either side of the cut is unchanged and material certification survives. Where the next step is a weld, the weld procedure inherits clean parent metal. For petrochemical and marine work, that is often the difference between a cut being acceptable and not.
What a compliant spread looks like
High pressure water jetting in Australia is governed by AS/NZS 4233, and everything in the industrial cutting class sits deep in Class B, the highest classification. That carries real obligations: every operator trained and assessed to the national competency, a nozzle operator and safety observer on every crew, two independent shutoffs on every gun, and defined exclusion zones with controlled entry. A contractor who cannot show you those things on paper before mobilisation should not be holding the gun.
The honest limits
Cold cutting is not a universal answer. Steel plate cuts cleanly to around 100 millimetres while holding precision, and beyond that the choice moves to diamond wire or staged approaches. Production is slower per cut than flame. The commercial case is won at facility level: fewer permits, no gas-freeing, trades working in parallel, and a waste stream of water and inert garnet instead of fume and slag. Price the shutdown, not the cut, and cold wins far more often than the rate sheet suggests.
Related: Cold cutting without heat · High-hazard and remote projects
DeconCut acknowledges the Aboriginal and Torres Strait Isander people as Traditional Custodians of the country on which we live and work. We pay our respects to the Traditional Custodians and Elders past, present and future, and honour their connection to the land and ongoing contribution to society.