The turbine meters covered by this standard are divided into class I and class II meters. Both classes of meters register by recording the revolutions of a turbine set in motion by the force of flowing water striking its blades. Class I meters are the vertical-shaft and low-velocity horizontal-shaft models. Class II meters are the in-line, horizontal-axis, high-velocity-type turbines characterized by lower head loss and a wider normal operating flow range than class I models.

The purpose of this standard is to provide the minimum requirements for cold-water, turbine-type meters, including materials and design. This standard can be referenced in specifications for purchasing and receiving and can be used for manufacturing this type of meter.