The IEC Aerodynamic Valve Noise Prediction Standard Revisited

摘要

Engineering standards whether of national or international status are, by the rules of their responsible institutions, subject to review or "maintenance" periodically, usually every five years. It was to comply with this rule that the IEC control valve noise prediction standard 534-8-3 came up for review in the year 2000 and again in 2005. The review of 2000 left the standard relatively unchanged, the team of review experts having decided that it was fundamentally satisfactory. The review of 2005 has extended into 2007/8 with a working group of noise experts still scrutinizing the standard, even as this paper is being written. That the standard is currently being revised is common knowledge throughout the world-wide national standards committees so there is a certain amount of speculation, outside the ranks of the IEC, about the proposals that will eventually emerge from the IEC working group after approval has been given by the full IEC subcommittee 65B/WG9. This could result in extensive changes or no changes or anything between these two extremes. The next stage will be the circulation of the draft to the various national standards committees who will be asked to forward comments for further consideration by the working group 9 of the IEC subcommittee 65B.