UCLH, Arthur Stanley House
|UCLH NHS Trust
|Basement M & E Plant Removal
|Arthur Stanley House, Tottenham, London
The project involved the extensive mechanical & electrical plant dismantling and removal of the entire basement services. Among one of the most challenging elements of the project was the removal of the substantial fuel storage tanks and heavy boilers. Large existing vent ducting and sections of concrete walls required careful removal to install a certificated chain and hoist gantry system, to allow for the fragmented plant sections to be removed from site.
As the majority of dismantling involved “Hot works” an efficient fume extraction system was installed to allow for the smoke, gases and vapours to vent to atmosphere. Careful consideration was also required not to contaminate the open natural spring water system flowing through various parts of the basement, the situation was fully risk assessed and appropriate measures put in place to prevent any potential contamination to the natural spring waters.
Scope of Works
- Removal of numerous chemicals, acids and hazardous materials within the basement areas, to licensed waste disposal facilities under EA consignment notes.
- The basement contained a suspected steel acid tank, which required careful investigation by operatives wearing full BA and chemical suites. Despite heavy residues of acid present on the pipework and surfaces of the tank, it was confirmed the tank currently contained water. This was subsequently fragmented and removed from site, together with eighty metres of chemical pipework which required thoroughly flushing through and decontaminating prior to its removal.
- The only access into the basement was a single stairway not suitable for the removal of plant sections, therefore large sections of ducting were removed together with sections of a concrete wall to allow for a certificated lifting gantry system to be installed, all sections from the basement being hoisted to ground level for disposal off site.
- Two basement tank rooms contained a total of 5 nr 50,000 litre steel fuel storage tanks, these were cleaned, degassed, “Hot cut” into manageable sections and removed from site.
- All associated pipework from the fuel tanks to the boilers was removed, including the offset fill lines, the pipework varied from 75mm down to 25mm.
- Within the engineers workshop an historic acid spill had occurred onto the suspended ceiling, the ceiling required careful removal under controlled conditions.
- Banks of control panels operating the basement M&E plant were dismantled and removed.
- Various water storage tanks were fragmented and removed including 2 nr 9,000 litre Braithwaite steel sectional tanks and 1 nr 9,000 litre GRP water tank.
- A major element of the project involved the removal of 3 nr 9 megawatt (35 tonne) tubular boilers. Scaffold was erected around each boiler to allow for their careful dismantling under “Hot Works” permits. A substantial fume extraction system was installed to allow for venting to atmosphere.
- The final part of the project required the remainder of the plant and equipment to be removed, this included the basements extensive air ducting system to the building, numerous pump sets and calorifiers and bottled storage systems supplying nitrogen and oxygen to various parts of the former hospital.