The building or project condition
An energised transmission substation. The switchyard stayed live throughout, and the doorsets were installed new rather than replacing existing ones.
What FRS delivered
- Supplied and installed new fire-rated doorsets — leaves, frames and hardware as complete assemblies
- Sealed the architectural penetrations through the rated construction
- Recorded each doorset and each penetration against its location
What made it difficult
- An energised substation throughout — the switchyard was never taken out of service for us
- A doorset is only as good as the opening it sits in, so the frame and the surrounding construction had to be right before the leaf went on
- Two scopes on one mobilisation, sequenced so neither held the other up
- High-voltage plant live alongside the work, with approach distances that do not move for anyone
- Access under the asset owner's permit and switching regime — authorised, escorted, and only to the areas released
- Utility-specific inductions before any crew sets foot on site
- Tools, plant and materials planned around what can safely be carried and used near energised equipment
- Weather calls out of our hands — a switchyard is an exposed site, and work stops when the asset owner says it stops
What was recorded at close-out
- Fire door schedule with asset information for each doorset
- Location-by-location penetration record with photographs
- Certificate of Compliance
Installing a fire doorset new is a different job from replacing one. There is no existing frame to work to and no previous installation to copy — the opening, the frame, the fixings and the surrounding construction all have to be set out to the tested detail, because that is what the door's performance actually depends on.
FRS supplied and installed the doorsets complete — leaves, frames and hardware — and sealed the architectural penetrations through the same rated construction on the same mobilisation. One contractor, one record, and no gap between the door package and the penetration package where each assumes the other has it covered.
Every doorset went out with its asset information recorded, which is what makes the next inspection cycle possible on a site nobody visits casually.
The substation stayed energised the whole time. Nothing was switched out to make our work easier, which is the normal answer on a transmission asset — the network does not come down so a contractor can hang a door.
So a substation is not a difficult building to work in technically. It is a difficult building to get into. Access is granted area by area under the asset owner's permit system, the approach distances around live plant are fixed, and nothing happens until the authorisation is in place.
So the planning is the job. The doorsets, the frames and the hardware were scheduled against the access that was actually going to be released, and the crew mobilised able to complete what they were let in to do. The alternative — turning up and finding out — costs a second mobilisation and the asset owner's patience.
