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The Twelve Days of Christmas With Hydro Cleansing | 2. Case Study NPL

“On the second day of Christmas,
my true love sent to me,
two feet of tree roots,
and Hydro Cleansing’s Mega-Heat…”

Continuing our twelve day countdown to Christmas, today’s blog is a nice juicy case study! However, this isn’t just any case study, this case study features blocked culverts, four foot long tree roots, over 50 TONNES of silt, and of course, an expert team of Hydro Cleansing engineers getting the job done. 

Back in the Summer we were called out to deal with some blocked culverts, syphons and silt traps by the NPL. On our arrival it was clear that there was something seriously big blocking the syphon under the railway, even our camera couldn’t travel underneath to get a clear picture. Upon further investigation the engineers discovered that the blockage was clusters of tree roots growing through the tunnels. Check out the full scope of works below!

blocked culvert case study christmas

Client – National Physical Laboratories | Kings River Outfall Desilting

Scope of Works – Desilting of culvert | Root cutting in syphon under railway | Desilting of silt traps

  1. The culvert in Normansfield Road had a high level of silt and elevated water level, the camera was then unable to return a picture of the internal condition of the pipe. We needed to remove this silt and reduce the flow during the survey, we then proposed to undertake this with a super combination unit taking one day to complete and resurvey.
  1. The syphon under the rail way had root ingress which prevented the passage of the camera, to remove this we needed to reduce the flow through the culvert and use high pressure root cutting with specialist root cutting nozzles suitable for large bore pipes. We took one day to complete and resurvey.
  1. The silt traps in five manholes needed de-silting, they contained an average of 1m of silt each. The silt traps are 2.5m in diameter which will yield approximately nine tonnes each. We took two days to complete.

case study blocked culvert and camera christmas

case study blocked culvert and roots christmas

Check out those roots! Job done!

Kingston Fatberg

Over the past few weeks you can’t have escaped the press coverage that has surrounded the now infamous fatberg lurking under Kingston, southwest London. If you have then you’ve most probably been hiding down a sewer yourself! The supposed ‘bus sized’ fatberg could have potentially pushed raw sewage up into homes and onto the streets of Kingston but how has this been allowed to happen?

Weighing in at a reported 15 tonnes this mount of congealed fat, oil and grease mixed with other revolting waste products was brought to the attention of local water authorities after local residents complained about having difficulty flushing their toilets. But how can its weight have been calculated when it hadn’t even been removed.  Surely the actual weight of a fatberg cannot be decided properly until the job is complete?

Subject to contrary belief we believe the fatberg is yet to be fully removed and in fact weighs a lot less than 15 tonne. Without the necessary equipment and technical know-how the removal of this particular fatberg will take a lot longer than expected, all the while still causing problems for local residents. Time and investment are an essential requirement when it comes to preparing yourself to undertake such specialist works. Megatron is a textbook example of this.

Megatron was commissioned back in 2008 when Hydro Cleansing invested over half a million pounds engineering this wastewater monster to our own personal spec. From our perspective we had three main objectives we wanted to achieve:

  1. Increase the capability of a single onsite vehicle, which also reduces our environmental impact and carbon footprint
  2. Cope with the inevitable migration from planned to reactive works
  3. Time efficiency, reducing job turnaround times

With Megatron now undertaking works that were previously relinquished, and with more units in the pipeline, Hydro Cleansing are more than capable of embarking on any major works or specialist projects all the while alleviating any concerns that the job is to big or can’t be done at all.

Kingston Fatberg

Image taken from www.theguardian.com

Megatron Birthday Cake

Check out Steve’s Megatron Birthday Cake…

(A big thanks to Shelley’s Cakes in Kent)

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