BS EN 12735-1:2020 pdf free.Copper and copper alloys一Seamless, round tubes for air conditioning and refrigeration.Tubes for piping systems.
BS EN 12735-1 This document specifies the requirements, sampling, test methods and conditions of delivery for seamless round copper and copper alloy tubes used for refrigeration and air-conditioning piping systems (i.e. piping, connections and repairs).It is applicable to tubes with an outside diameter from 3 mm up to and including 219 mm. Tubes made of the copper-grade Cu-DHP are supplied in straight lengths in the material conditions hard or half-hard, or in coils in the annealed material condition.Tubes made of the alloy CuFe2P are supplied in straight length in the material conditions hard or annealed.Deviation from circular form for products made of the copper-grade Cu-DHP (CW024A) for R290 (hard) and R250 (half-hard) material condition tubes and for products made of the alloy CuFe2P (CW107) for R300 (annealed), and R420 (hard) material condition tubes is included in the tolerances on the outside diameter given in Table 5.Unless otherwise agreed between the purchaser and the supplier, no tolerances on deviation from circular form are applicable to R220 (annealed) material condition of Cu-DHP (CW024A] tubes except coiled tubes with diameters up to and including 16 mm. In this case, the deviation from circular form shall not exceed 7 % of the outside diameter.In case of dispute, the coil shall be straightened in an appropriate way before measurement in order to improve the accuracy when determining the maximum deviation from circular form.In the event that the tube sample fails to meet the test requirements the batch represented by the tube sample or, in the case of continuous production all tubes manufactured since the previous check, shall be placed in a bond.Further samples shall be taken from the bonded tubes at a sampling rate four times more frequent than specified in Clause 7. If any of the retest samples fail to meet the specification requirements the tubes represented by the samples shall be deemed not to meet the requirements of this document and shall be rejected. If all the retest samples meet the requirements, the tubes represented by the samples shall be deemed to meet the requirements of this document.BS EN 12735-1 pdf download.