"GB/T 18916.13-2024 Industrial Water Quotas, Part 13: Ethylene and Propylene" stipulates the method of calculating water quotas, specific quota requirements and management regulations for ethylene and propylene production enterprises. This standard is applicable to guide the management of water resources in the production process of ethylene and propylene, to ensure the rational use of water resources in the production process, to achieve the purpose of conservation and environmental protection. The standard refers to a number of necessary normative documents, including standards on ethylene for industrial use, coalescence grade propylene, water equilibrate testing, establishment of industrial water quotas and management of water use measuring instruments, to ensure the scientific and effective management of water use.