ISO 4064-4:2014

Overview

ISO 4064-4:2014 is Part 4 of the ISO 4064 series addressing non‑metrological requirements for water meters used to measure the volume of cold potable water and hot water in fully charged, closed conduits. It complements the metrological and test requirements in ISO 4064‑1 and ISO 4064‑2 by specifying technical characteristics, connection interfaces, dimensional requirements and pressure‑loss criteria for in‑line, concentric and cartridge water meters (including combination meters and exchangeable metrological modules). The standard applies to mechanical, electrical/electronic and hybrid meters and to electronic ancillary devices.

Key topics and technical requirements

• Scope and applicability: Covers meters able to withstand specified maximum admissible pressure and temperatures for both cold and hot water metering.
  • MAP (maximum admissible pressure): at least 1 MPa (note: 0.6 MPa for meters intended for pipe DNs ≥ 500 mm).
  • MAT (maximum admissible temperature): 30 °C for cold potable water meters; up to 180 °C for hot water meters depending on class.
• Meter types covered: in‑line meters, concentric meters, cartridge meters, exchangeable metrological modules, combination meters; includes mechanical and electronic measurement principles.
• Dimensional and connection requirements: standardized overall dimensions, threaded and flanged end connections (references to ISO 228‑1 and ISO 7005 series), manifold face designs for concentric meters, and detailed connection interface solutions for cartridge meters.
• Pressure‑loss and technical characteristics: requirements and limits to ensure hydraulic performance; manufacturer guidance for clearances and access.
• Ancillary devices: applies to optional electronic ancillary devices (sensors, calculators, communications); notes that national regulations may mandate some ancillary devices.
• Annexes and illustrations: contains informative annexes and multiple figures/tables for manifold designs, cartridge interfaces and exchangeable module dimensions.

Practical applications - who uses ISO 4064-4:2014

• Manufacturers: for product design, dimensions, manifold and cartridge interfaces, and pressure/temperature class selection.
• Utilities and meter operators: for procurement specifications, interoperability (exchangeable modules), and system compatibility.
• Installers and OEMs: to ensure correct flanged/threaded connections and clearances during installation and replacement.
• Test laboratories and conformity assessors: to verify non‑metrological requirements complementary to metrological tests.
• Regulators and standards writers: to reference pressure, temperature and ancillary device requirements in regulations and tender documents.

Related standards

• ISO 4064‑1 (metrological and technical requirements)
• ISO 4064‑2 (test methods)
• ISO 4064‑3 (test report format)
• ISO 4064‑5 (installation requirements)
• ISO 228‑1 (pipe thread dimensions)
• ISO 7005‑2 / ISO 7005‑3 (metallic flange dimensions)

ISO 4064-4:2014 is essential for anyone specifying, designing or installing water meters for cold potable and hot water systems where consistent mechanical, hydraulic and interface requirements are needed.