What we surveyed
A CCTV inspection at a residential property in Welshpool (SY21), covering 3 separate runs of pipework, 100 mm bore, combined.
The system is vitrified clay.
Vitrified clay is what most pre-1970s drainage in the Midlands is built from. It is durable but brittle, and its short pipe lengths mean many joints – which is where almost everything goes wrong.
What the camera found
10 defects were logged and coded.
The worst section graded B on the Drain Repair Book scale.
Displaced and open joints (10 observations)
Displaced joints are where one pipe length has moved relative to the next. Ground movement and, across much of the Black Country, historic mining subsidence are the usual causes. Each step is somewhere solids can lodge and roots can enter.
| Distance | Code | Observation |
|---|---|---|
| 0.50 m | JDM | Joint displaced medium |
| 0.80 m | JDM | S1 Joint displaced medium |
| 0.90 m | JDM | S1 Joint displaced medium |
| 1.50 m | JDM | Joint displaced medium |
| 1.60 m | JDM | Joint displaced medium |
| 2.30 m | JDM | Joint displaced medium |
_Distances are measured from the start of the run in which each observation was recorded, not from a single point._
_4 further displaced and open joints observations were recorded._
Outcome
Talk to the person who will do the work.
Surveys across the West Midlands, south Staffordshire, east Shropshire and north Worcestershire. Unblocking closer to home.