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Contract awarded for Declaration for the conclusion of a framework agreement for the supply of goods titled 'supply of 250,000 liters of antifreeze for bus engines and 1,000,000 liters of aqueous urea solution', to meet the needs of the public transport company, through an open procedure, via e-supply, with the award criterion being the most economically advantageous offer, based solely on price. { "detected_language": "greek", "translated_text": "lot-0002, title: tmhma 2 – aqueous urea solution (40-077790-01), description: tmhma 2 – aqueous urea solution (40-077790-01) the aqueous urea solution to be procured will be used for the operation of the scr (selective catalytic reducer) catalytic systems of the new buses of osy sa with euro iv and euro v technology. the scr catalytic system achieves a significant reduction in harmful nitrogen oxide (nox) emissions from exhaust gases (maximum limit 2g/kwh for euro v technology vehicles and 3.5g/kwh for euro iv technology vehicles). the composition of the solution to be procured consists of 32.5% of its total weight from pure urea (nh2)2 co and the remainder from deionized (desalinated) water. the aqueous urea solution to be procured must be of exceptional purity, from a recognized manufacturing plant, so that the ceramic catalytic converters of the scr system are protected during operation from damage due to blockage or deactivation of the active porous surface from unwanted substances or salts that could be contained in low-quality solutions. the low performance of the scr system due to the use of low-quality aqueous urea solution increases nitrogen oxide (nox) emissions and causes damage to both the catalyst and the engine due to increased exhaust gas pressure. for the above reasons, the aqueous urea solution to be procured must strictly follow the specifications mentioned in the international standard iso 22241, the german standard din 70070, as well as the guidelines of the european chemical industry council cefic, which are as follows: property unit minimum maximum o urea (urea) % by weight 31.8 33.2 o alkalinity as nh3 % by weight 0.2 o biuret (component of urea concentrate) % by weight 0.3 o insolubles (insolubles) mg/kg 20.0 o aldehydes (aldehydes) mg/kg 5.0 o phosphate (po4) (phosphate po4) mg/kg 0.5 o aluminium (aluminium) mg/kg 0.5 o calcium (calcium) mg/kg 0.5 property unit minimum maximum o iron (iron) mg/kg 0.5 o copper (copper) mg/kg 0.2 o zinc (zinc) mg/kg 0.2 o chromium (chromium) mg/kg 0.2 o nickel (nickel) mg/kg 0.2 o magnesium (magnesium) mg/kg 0.5 o sodium (sodium) mg/kg 0.5 o potassium (potassium) mg/kg 0.5 o density at 20°c (density at 20°c) kg/m3 1087.0 1093.0 o refractive index at 20°c 1.3814 1.3843 general characteristics of the aqueous urea solution: o chemical composition: solution of pure urea in deionized water o solubility in water: unlimited o color: colorless o odor: odorless or very faintly ammonia o crystallization point: -11.50°c o conductivity at 25°c: approximately 0.570 w/m k o density at 25°c: approximately 1.4 mpa s o specific heat at 25°c: approximately 3.4 kj/kg k o surface tension: minimum 65 mn/m the aqueous urea solution, based on the european classification of materials, is classified as a non-hazardous material for humans, animals, and the environment. from production to delivery of the product for use in buses, all necessary measures must be taken so that the aqueous urea solution is not contaminated or altered. for this reason, the transport and disposal of the solution from the manufacturer to the delivery at the facilities of osy sa must be carried out according to the strict specifications mentioned in the standards iso 22241, din 70070, and the cefic directive, specifications which concern the construction materials of the transport and storage tanks, the cleaning method before filling, the transport and storage conditions, as well as the materials of the transfer equipment. specifically, the transport of the solution is allowed only with tanks that will be made from the following materials defined in the aforementioned standards: o high specification stainless steel alloy (austenitic) with cr – ni and cr - ni – mo according to din en 10088 (1-3) processed based on industrial standards. o hd polyethylene o hd polypropylene o polyfluorethylene o polyvinylidenedifluoride o poly(perfluoroalkoxy) pfa o polyisobutylene o titanium o viton plastic containers made from other materials are prohibited as they may contain additives that could \"migrate\" into the aqueous solution, resulting in contamination and creating problems for the catalysts and engines of the buses. the tanks and containers must be used exclusively for the transport of the aqueous urea solution. in addition to the materials of the tanks, special attention must be given to the transport and storage conditions of the solution due to its particular characteristics. the solution must be protected from high temperatures above 30°c, solar radiation, and temperatures below -11°c. high temperature (above 30°c) poses the risk of hydrolysis of the solution and its breakdown into ammonia nh3 and carbon dioxide co2. also, low temperature (below -11°c) poses the risk of crystallization of the material. based on the above data, the temperature range in which the transport and storage of the estimated value excluding vat: 550000.00 eur.Declaration for the conclusion of a framework agreement for the supply of goods titled 'supply of 250,000 liters of antifreeze for bus engines and 1,000,000 liters of aqueous urea solution', to meet the needs of the public transport company, through an open procedure, via e-supply, with the award criterion being the most economically advantageous offer, based solely on price.
