ISA RP74.01 : 1984

1 Purpose and scope
2 Definitions
3 Conveyor design recommendations
    3.1 Conveyor length
    3.2 Maximum angle of inclination
    3.3 Belt speed
    3.4 Troughing angle carrying idlers
    3.5 Idler spacing
    3.6 Takeup
    3.7 Concave/convex curves
    3.8 Conveyor stringers
    3.9 Conveyor vertical supports
    3.10 Support footing
    3.11 Training idlers
    3.12 Weigh idlers
    3.13 Conveyor load point
    3.14 Wind loading
    3.15 Material transition
    3.16 Idler alignment
    3.17 Belt tracking
    3.18 Calibration chain storage
4 Calibration
    4.1 Methods
    4.2 Frequency of alignment, calibration, and
          zero balancing
5 Accuracy
6 Belt weigh scale components
    6.1 Load sensor and reactor
    6.2 Speed measurement system
    6.3 Multiplier
    6.4 Information display
    6.5 Transmission
    6.6 Power supply
    6.7 Enclosure
7 Scale maintenance
    7.1 Cleanliness
    7.2 Alignment
    7.3 Tension adjustment
    7.4 Monitoring accuracy
8 Bibliography
Appendix A - OIML recommendation no. 50, CHAPTER II,
             metrological requirements
Appendix B - Test report

The ISA Standards & Practices Board has removed this document from active status, meaning it is no longer being reviewed or assessed for accuracy, for relevance to current practices, or for further applications. However, some users may find that the document still provides valid and useful content for their specific needs.Furnishes design criteria conducive to simplified specifications and provides recommendations for installation, calibration, and maintenance of continuous belt, weighbridge-type scales. This recommended practice provides an effective base of comparison for scale suppliers, establishes minimum values, and ensures that a scale specification and purchase incorporates the essentials to satisfy a particular weighing job. It permits early belt conveyor design, with the full knowledge of the weigh scale configuration, regardless of the manufacturer.Scope: The recommended practice will provide an effective base of comparison of scale suppliers, will establish minimum values, and will ensure that a scale specification and purchase incorporates the essentials to satisfy a particular weighing job. It will permit full knowledge of the weigh scale configuration (regardless of the manufacturer) early in the design stages of the belt conveyor.Purpose: The purpose of this recommended practice is to furnish design criteria inducive to simplified specifications and to provide recommendations for installation, calibration, and maintenance of continuous-belt, weighbridge-type scales.