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After the fire in the channel tunnel in 2008 the cleanup operation was massive. Each and every piece of equipment was stretched to the limit, and some beyond. One of the service and maintenance train modules the "Drain Cleaning Rig" was used over and above its intended design and by 2009 had suffered the consequences and became inoperable.
The Drain Cleaning Rig is a one-off 250,000 piece of equipment capable of generating 6000psi of pressurised water through one of its 14,000cc (14 li) diesel engines. The second Deutz F8L 413 series v8 engine generates another 200hp to power the NASH vacuum pump which can generate negative 1 bar of vacuum pressure to suck up debris and slurry into a holding tank. Operable since the 90's when the tunnel first opened, this piece of equipment is used regularly to keep the drains and walkways clear and clean. There is no substitute or spare piece of equipment that can perform this task.

Showan was the company chosen to carry out the refurbishment due to a combination of in-house skill and expertise, ability to rapidly turn the refurbishment around and competitive price.

During the 8 week refurbishment program the machine was disassembled into over 2500 component parts, each and every one being scrutinized and repaired or replaced where necessary. In addition to replacement of every nut, bolt and fastener with new stainless steel items, all gaskets and seals were replaced with new. A specialist hydraulics facility within Showan overhauled all pneumatic and hydraulic cylinders, actuators, valves, pumps and motors in addition to replacing all hoses and pipes and repairing the HIAB crane. The HIAB crane was load tested for conformity.

An electrical engineering division within our company totally rewired the equipment replacing all light fittings, control systems, pumps and motors. A new 16KVA generator was supplied and commissioned to run the electrical installation.

Both Deutz v8 diesel engines received a full top-end strip down and decoke in accordance with the manufacturers recommendations and beyond. The bores of each cylinder were honed, piston rings replaced and bottom end oil journals inspected. On reassembly new head gaskets and shims were installed and each cylinder had the bump stops correctly aligned prior to a refurbished injection pump and injectors being installed.
Both the Harben high pressure water pump and the Nash vacuum pump and associated gearboxes were striped and repaired / refurbished by means of a thorough overhaul.

Each component of the machine was grit blasted (shot blasted) and painted to Eurotunnel specifications and the project was delivered back to Eurotunnel on budget.
Most importantly, the downtime for channel tunnel operators Eurotunnel was kept to an absolute minimum.

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