ISO 16122-4:2015

Overview - ISO 16122-4:2015 (Inspection of fixed and semi-mobile sprayers)

ISO 16122-4:2015 is part of the ISO 16122 series on the inspection of sprayers in use. Used together with ISO 16122‑1, this part specifies requirements and test methods for the inspection of fixed and semi-mobile sprayers in agricultural and forestry applications. The standard focuses on the sprayer’s condition relative to environmental risk and its ability to achieve effective, uniform application of plant protection products. It does not apply to spatial treatment equipment such as foggers. Requirements for inspector protection are covered in ISO 16122‑1.

Key technical topics and requirements

The standard addresses inspection items and verification methods across the sprayer system. Major technical topics include:

• Leaks and dripping: static and dynamic leak checks, spraying or dripping onto components.
• Pump performance: capacity, pulsations and air chamber function.
• Agitation systems: hydraulic and mechanical agitation checks to ensure uniform spray mix.
• Spray liquid tanks: lids, filling holes, induction hoppers, pressure compensation, tank indicators, emptying/filling and container-cleaning devices.
• Measuring, control and regulation systems: pressure indicators, flow meters and direct-injection system accuracy.
• Lines, hoses and filters: integrity, presence and isolation of filters, and changeability of filter inserts.
• Application units: inspection of booms (horizontal and vertical), spray guns/lances and dripping control.
• Distribution and nozzle performance: uniformity of transverse distribution (patternator use), nozzle output checks and optional vertical distribution data.
• Auxiliary systems: blowers, autonomous application units, cleaning equipment.
• Test methods: defined procedures for pump capacity and pulsation tests, pressure-indicator verification, flow-meter procedures, patternator distribution tests, nozzle flow measurements, pressure-drop and pressure-variation checks, and direct-injection accuracy.

Practical applications - who uses this standard

ISO 16122-4 is practical for:

• Sprayer inspectors performing on-site compliance and maintenance checks.
• Farm and forestry managers who want to ensure safe, effective application and reduce environmental risk.
• Manufacturers and service providers validating in-use performance or designing inspection-friendly features.
• Regulators and certification bodies developing inspection programs or enforcing application safety.
• Environmental and IPM (integrated pest management) advisors aiming to minimize off-target drift and contamination.

Benefits include improved application accuracy, reduced environmental contamination risk, better maintenance practices, and documented evidence for compliance programs.

Related standards

• ISO 16122‑1: General (inspector protection and general inspection framework)
• ISO 16122‑2: Horizontal boom sprayers
• ISO 16122‑3: Sprayers for bush and tree crops
• Related design/safety standards referenced in the series: ISO 4254‑6, ISO 16119 series

Keywords: ISO 16122-4:2015, inspection of sprayers, fixed and semi-mobile sprayers, sprayer inspection, agricultural and forestry machines, test methods, pump capacity, patternator, nozzle flow, environmental risk, sprayer maintenance.