Four Engineering
Field notes from two decades on industrial sites.
Practical guidance on marine, lifting, MEP, HVAC, firefighting and lubrication engineering — written by the team that does the work, not a marketing desk.
What we've learned keeping equipment running.
Corrosion doesn't wait for dry dock.
Most marine mechanical failures we're called out for trace back to corrosion that was visible months earlier. A simple quarterly check — sacrificial anodes, seal integrity, shaft alignment and coating condition — catches the majority of it before it becomes a haul-out problem.
Inspection intervals aren't a formality.
Lifting gear that looks fine can still be past its safe working life. We schedule inspections against the manufacturer's duty cycle and the load history of the equipment, not a generic annual date — it's the difference between a certificate and an actually safe lift.
Retrofit MEP fails at the handoff, not the design.
On retrofit work, mechanical, electrical and plumbing trades are usually designed by separate teams working from an as-built drawing that's slightly wrong. Walking the site jointly with all three disciplines before work starts removes most clashes that otherwise surface mid-installation.
Airflow and energy cost pull in opposite directions.
Industrial ventilation is usually sized for worst-case heat load and then run flat out year-round. Zoning the system and tying fan speed to actual occupancy or process load typically cuts energy use without giving up the air quality the facility needs.
The inspection most facilities skip.
Sprinkler heads and detectors get checked. Fire pump run tests and standpipe hydrostatic checks get skipped far more often, usually because they require shutting a system down briefly. They're also the tests most likely to catch a system that would fail when it's actually needed.
Oil analysis is a sensor, not paperwork.
Routine oil sampling is often treated as a compliance checkbox. Read alongside particle counts and viscosity trends over time, it flags bearing wear and contamination ingress weeks before vibration or temperature alarms would — turning a scheduled task into predictive maintenance.
Talk to the engineers behind these notes.
If something here is close to a problem you're facing on site, get in touch — we're glad to talk through it directly.