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As pointed out in another comment and previously on HN, my new favourite source for specs are regional English translations from Estonia. Here’s one for IEC 61362 for 22 EUR: https://www.evs.ee/en/evs-en-61362-2012

> It does not exist

Sure does! First line from a random page (44) of 61362:2012: "...the runner blade opening is brought to a certain position to provide a given flow rate after load..."

They wouldn't pay $300 for it because the price is too high or because they don't need it? If their specialty makes them need the document, why would they not pay $300? I'm curious.