Ashford Environmental Services - Flushing & Commissioning Case Studies
The New Queen’s Hospital Romford
Ashford’s landmark project, the £200M Queen’s Hospital in East London was successfully completed within the required timeframe
Four 1MW MTHW boilers and four 1500kW air cooled chillers provide the heating and cooling to 4500 rooms via 42 supply air handling units and a mixture of active chilled/ low temperature hot water beams, VAV boxes and diffusers. A similar number of clean extract fans remove vitiated air, assisted by approximately 42 dirty, smoke and special extract systems. The energy centre also houses a CHP plant.
Bovis Lend Lease were the main contractors with Haden Young South East as the sub contractor who appointed Ashford as their specialist flushing, water treatment and commissioning sub-contractor
Ashford has also secured contracts with the hospital’s FM Sodexho for ongoing monitoring of water quality, staff training and L8 Compliance.
Global Switch, Clichy, Paris, France
Ashford undertook the commissioning and water treatment on behalf of Global Switch at the converted BIC Pen factory in Clichy, Paris.
Seven roof mounted closed circuit evaporative coolers capable of rejecting 20 MW of heat serve the building via a 600mm diameter ring main which feeds all levels via flow and return risers at each end of the building. Each floor is provided with 100% back-up by on floor pump rooms and dual 300 mm diameter ring mains. The Landlords services were relatively easy to flush and clean using the installed pumps, however, fit-out of the 6th floor for Level 3 Communications presented a number of issues as the contract prevented use of installed pumps. Temporary diesel driven pumps were utilised to achieve flowrates in excess of 100 litres per second. The pump was sited externally with 8 inch flexible hoses run up purpose built scaffolding to connect to the ring mains on the 6th floor. Windows and doors had to be temporarily removed to facilitate the process. Many projects have since been successfully completed using temporary pumps.
125 London Wall - J.P. Morgan Chase
Ashford Environmental Services Limited was awarded the contract on a competitive tender basis by consulting engineers, The Anslow Partnership.
Chilled Water Validation
The purpose of the extensive testing was to establish chilled water availability within the occupied building so that future expansion could be planned accurately.
The survey involved multiple recording devices logging temperature, humidity and flowrate every 15minutes over a six day continuous period.
Ashford also provided the controls expertise to carry out adjustments to facilitate the test process whilst maintaining environmental conditions for the occupants during normal hours.
Atlas House, No 1 King Street London
Ashford won the competitive tender to carry the re-commissioning of the services within Atlas House, No.1 King Street in the City of London
It soon became apparent that there were serious failings in both plant and control systems and Ashford were then instructed to carry out a full validation survey of all mechanical plant and control systems.
The process was especially difficult as the building was not only fully occupied, but had multiple tenants requiring close and diplomatic liaison to gain access above ceiling within each demise
Ashford were then given a post survey order to replace all the existing main plant controls with a new DDC system and fit new control panels within both the boiler house and chiller plant rooms. New terminal controls were also fitted to terminal devices on the 2nd and 3rd floors.
Some of the tenants would not agree to new controls on their floors and therefore final re-commissioning was limited to the main plant, main distribution and floors where remedials were carried out.
Environmental conditions were improved to all areas with new controls and significant running cost savings were realised by the land lord.