Overview
ISO 3822-2:1995 is Part 2 of the ISO 3822 series on laboratory tests for noise emission from water-supply appliances. This part defines the mounting and operating conditions to be used when measuring noise emitted by draw-off taps and mixing valves (including single- and two-supply sanitary fittings) so that acoustic results are repeatable and comparable. The document replaces the first edition and complements the measurement method given in ISO 3822-1.
Key practical points drawn from the standard include required test pressures, inlet and outlet arrangements, and treatment of interchangeable accessories to ensure low-noise, standardized hydraulic conditions during laboratory measurement.
Key Topics
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Scope and applicability: Applies to draw-off taps, mixers and conventional mixing valves used in building water installations. Excludes certain combined electrical or special devices.
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Test pressure range: Mounting and operating conditions are intended for a dynamic pressure interval of 0.1 MPa to 0.5 MPa; routine tests are specified at 0.3 MPa and 0.5 MPa unless flow regulators require different settings.
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Water temperature: For mixers supplied with hot and cold water, tests are performed with water at ambient temperature not exceeding 25 °C at each supply.
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Inlet connections and mounting:
- Threaded fittings: connect to the test circuit using specified long-radius bends or nipples in accordance with ISO 49 and ISO 7-1.
- Smooth inlets: install with rigid, leak-tight connections that avoid trapped air (welded spigots, union nuts, or compression fittings).
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Interchangeable outlets: Accessories such as aerators, shower hoses or handsets are replaced by standardized low-noise hydraulic resistances (per the referenced annexes) when they are removable; if fixed they remain in place during testing.
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Test procedure summary: Typical steps include opening fully, stabilising dynamic pressure, measuring flow and acoustic levels, and recording maximum acoustic levels during controlled closure or temperature control variations for mixers.
Applications
- Product development and acoustic performance verification for water fittings (taps, mixers, valves).
- Quality control and type testing for manufacturers to ensure consistent noise emission behaviour across production runs.
- Comparative laboratory evaluation for specifiers, consultants and regulatory bodies assessing acoustic suitability of sanitary fittings in buildings.
Related Standards
- ISO 3822-1: Measurement method for laboratory noise tests (referenced for the full test method).
- ISO 3822-4: Guidance on mounting arrangements and low-noise hydraulic resistances for interchangeable outlets.
- ISO 7-1 and ISO 49: Thread and fitting dimensions and recommended connection practices used in test rig assembly.
By following ISO 3822-2:1995 mounting and operating requirements, laboratories and manufacturers achieve reproducible noise emission data for draw-off taps and mixing valves, supporting product improvement and acoustic specification compliance.
Open preview (PDF)Acoustics — Laboratory tests on noise emission from appliances and equipment used in water supply installations — Part 2: Mounting and operating conditions for draw-off taps and mixing valves
