This standard applies to thermal performance acceptance testing of standardised mechanical draught water cooling towers. It refers to preparation, execution and analysis of acceptance tests, and should already be recognised as integral part of the contract. Deviations from the rules laid out below, as well as any additions, need specific agreement and should be documented. This document is intended for use by suppliers, purchasers, owners, experts and testing agencies. It is available in English, French, German and Italian.