QC/T 1158-2022Calculation method of comprehensive water consumption per unit output of automobile products (English PDF)

3.1 Total comprehensive water consumption of automobile products

The amount of water, which is actually consumed during the entire production process of automobile products, within a certain measurement period.

3.2 Comprehensive water consumption for unit output of automobile products

Within a certain measurement period, the ratio -- of the comprehensive water consumption of automobile products TO the total amount of qualified products.

4.3 Types of comprehensive water consumption statistics

The types of automobile comprehensive water consumption statistics include surface water (measured by water supply from water purification plants), groundwater, urban water supply projects, other water or water products purchased by enterprises from the market (such as steam, hot water, geothermal water, etc.). However, for steam, hot water, underground hot water and other heated water or aquatic products, that do not enter the unit product or use condensed water, they are not included in the statistics.

The types of comprehensive water consumption statistics for automobiles do not include seawater, brackish water, rainwater, reused water, which is taken by the enterprise itself, as well as the amount of water used by the enterprise for water products supplied to the market (such as steam, hot water, and geothermal water, etc.).

Note: Recycled water refers to the wastewater, which is generated by enterprises, as stipulated in 3.21 of GB/T 21534-2018, which is used directly or after treatment in a water unit or system.

4.4 Statistical cycle

The statistical cycle shall be a certain period of continuous production, which has a statistical cycle of at least no less than 12 natural months.

4.5 Statistics on the quantity of automobile products

The statistics of quantity of automobile products shall be the quantity of qualified automobile products, which are produced within the statistical cycle.

5.1 Calculation method of comprehensive water consumption of automobile products

5.1.1 Calculation method of water intake in production system

The water consumption Q1 of the production system, in the production process of automobile products, is calculated according to formula (1):

Where:

Q1 - The maximum value of water, which is taken from the production system, during the production of automobile products, in cubic meters (m3);

QA - The numerical value of the water intake for the stamping process, in cubic meters (m3)