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Two 800mm hoods ready to extract the diesel fumes from the exhausts of an incoming train. By remote control, the hoods can manually or automatically be raised from their working position up to the ‘parking’ position, in order not to interfere with cranes or OLE lines.
Clean air for the refurbished North Pole IEP depot
Heiko Rees of Blaschke Umwelttechnik explains how its fl exible extract hoods will capture the diesel emissions of new hybrid trains.
A
recent installation at the train maintenance depot at North Pole in west London fulfi ls
the increasing demand from management and staff for a clean and healthy working environment. UK and European law requires air to be kept free from harmful exhaust gas emissions.
The subcontractor, German company Blaschke Umwelttechnik, has been a provider of diesel exhaust extraction systems to railways internationally for more than 40 years.
Mark W Diviani, commercial manager at contractor NG Bailey, based at its London offi ce, said: “It’s the fi rst time we worked with an extract specialist from the continent, but the cooperation was smooth, our partners are reliable and their system is of a high quality standard.”
London North Pole Depot is an existing facility originally constructed in 1994 for the Eurostar service. The depot was no longer required from 2007, when maintenance operations for this service moved to Temple Mills near Stratford International in east London. The North Pole facility is being modifi ed as part of the Intercity Express Programme
(IEP), with existing
building services being modifi ed and improved. New systems required for the maintenance of both electric and diesel powered trains are being installed.
Between May and June 2014, Blaschke supplied and installed a complete extract ventilation system, which consists of 30 fi xed capture hoods for the service shed vehicle exhaust extraction ventilation on roads 1 and 2, and two capture hoods directly above the equipment
The extract system uses two spiral-wound ducts running parallel along roads 1 and 2 above the OLE. Branching off the duct at every exhaust hood will be a duct that is attached to a plenum box via a fl exible duct. This plenum box has a second fl exible duct attached to it, which attaches to the capture hood at the other end of the fl exible duct.
When the system is in its stowed state, all extraction hoods will be raised to the maximum
drop on road 4. The required volume fl ow to extract the fumes is provided by two 37kW fans within the stores area on the fi rst fl oor of the service shed offi ce stores.
The incorporation of an interlock facility within the depot protection system is dealt with through a mechanical ‘trapped key’ system that ensures that only one of the two systems (the extract system or the OLE electrifi cation) can operate at a time.
The design for the mechanical fume extract systems within the maintenance shed is based on providing suffi cient air movement to parked trains on roads 1 and 2, and two fi xed points above the equipment drop on road 4.
When the diesel engines are worked on for maintenance purposes, the extraction system keeps the carbon monoxide levels below occupational exposure limits, as detailed in the HSE guidelines. Extraction is to be provided on roads 1 and 2 to cater for fi ve-, nine- and ten- car train units. The additional two extraction points on road 4 are linked to the system to provide two extraction hoods directly above the equipment drop.
‘Indirect measures are not eff ective’
“There is only one eff ective measure to avoid dangerous diesel fumes in railway depots. Direct extraction, which starts immediately and closes in on the exhaust, reliably captures and extracts almost 100% of toxic fumes. Indirect measures are not eff ective – they even take away ‘good’ breathing air.” - Hans J Blaschke
position, clearing the 600mm tolerance for the OLE that is required to allow safe electrifi cation of the OLE. When the exhaust system is required to operate, the OLE will need to be isolated via the interlock system and a signal sent to the extract master panel from the depot protection system panel. This will then enable the exhaust system to operate the required capture hoods onto the train by lowering the capture hood via a remote control. Each capture hood has two motors: one for the damper to open as the hood is lowered, and one for the raising and lowering of the hood.
Hans J Blaschke, owner and MD of Blaschke Umwelttechnik, said:
bespoke products; we tailor every last detail of the equipment to meet the special requirements of the existing or new depot, from budget solutions to most fl exible 360° rotatable extraction arms.”
FOR MORE INFORMATION
T: +49 827 18 16 9 17 E:
info@hblaschke.de W:
www.hblaschke.de
rail technology magazine Aug/Sep 14 | 113 “Our products are
Heiko Rees
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HALL 23 Stand 708
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