Disc brakes

Tender description

Iarnród Éireann are seeking expressions of interest from specialised rolling stock engineering companies for a tender process for the supply brake discs for its 22000 DMU and 85xx EMU fleets. The discs in question are a “wheel mounted annulus design” secured through the web of the wheel. The maximum operational speed of the disc is on the 22 000 fleet which operate at up to 160 km/hr. The current discs are manufactured from cast iron and have an internal and external diameter of 390 mm and 680 mm respectively. The selected disc will be required to be interchangeable with the current disc, require no modification to the existing wheel of fixing arrangement and result in no reduction or increase in braking performance. The disc should be wear resistant and not reach critical levels of wear in service, for a minimum period of 5 years under normal conditions. Iarnród Éireann are seeking expressions of interest from specialised rolling stock engineering companies for a tender process for the supply brake discs for its 22 000 DMU and 85xx EMU fleets. The discs in question are a “wheel mounted annulus design” secured through the web of the wheel. The maximum operational speed of the disc is on the 22 000 fleet which operate at up to 160 km/hr. The current discs are manufactured from cast iron and have an internal and external diameter of 390 mm and 680 mm respectively. The selected disc will be required to be interchangeable with the current disc, require no modification to the existing wheel of fixing arrangement and result in no reduction or increase in braking performance. The disc should be wear resistant and not reach critical levels of wear in service, for a minimum period of 5 years under normal conditions. The discs are to be manufactured in accordance with best industry practice and in line with applicable standards (to be advised). Where non OEM discs are proposed they are to be tested by the successful supplier as part of the approval process to ensure continuity of braking rates between variants. Additionally, the manufacture of discs is to be controlled in accordance with a demonstrable, recognised and certified quality control process and to the satisfaction of IE. IÉ have an approximated requirement for 624 discs in Year 1, Year 2 and Year 3 of the contract. It is anticipated that the quantities required in year 4 may be lower.