ISO 16784-2:2024

Overview

ISO 16784-2:2024 - "Corrosion of metals and alloys - Corrosion and fouling in industrial cooling water systems - Part 2" specifies a standardized method to evaluate the performance of cooling water treatment programmes using a pilot-scale test rig. The standard covers principles, required reagents and test waters, apparatus design, detailed test methods, result assessment and reporting. It is aimed at open recirculating cooling water systems and complements laboratory and on‑site heat‑exchanger testing (excluding heat exchangers with cooling water on the shell‑side).

Key topics and requirements

• Test waters and preparation: requirements for water quality, synthetic test waters and use of mother solutions to simulate make‑up water.
• Apparatus specification: components required for a pilot‑scale test rig, including heat‑exchanger section, temperature measurement, circulation‑rate monitor, make‑up/evaporation/blow‑down measurement, cooling tower, heating system and a water‑treatment simulation device. On‑line detection devices are also covered.
• Test procedure: standardized steps such as cleaning the test assembly, test tube preparation and pre‑treatment, system fill procedures, heating of test tubes, flow‑rate control, blow‑down and half‑life determination, biocide dosing and make‑up water management.
• Analytical controls: determination and monitoring of analytical parameters and control measurements during trials.
• Result assessment: evaluation of deposition/fouling, corrosion phenomena, pitting corrosion and corrosion rate; procedures for handling and treating test tubes after exposure.
• Reporting: required content and format for test reports; annexed test data sheets and supplementary measurement guidance are provided.

Practical applications and users

ISO 16784-2:2024 is intended for organizations that need reproducible, comparable evaluations of cooling water chemistry and treatment performance, including:

• Cooling system owners and operators seeking to validate treatment programmes for open recirculating systems.
• Water treatment vendors developing or benchmarking corrosion and fouling control additives.
• Corrosion engineers and R&D laboratories performing pilot‑scale testing or on‑site heat‑exchanger evaluations.
• Consultants and asset managers assessing risk, lifespan and maintenance planning for heat‑transfer equipment. The standard supports decisions on treatment selection (including modern technologies such as reverse osmosis and electrochemical treatments) and helps reduce operational risk, environmental impact and water use.

Related standards

Key normative references and related documents include:

• ISO 16784-1 (guidelines for conducting pilot‑scale evaluation)
• ISO 3696 (water for analytical laboratory use)
• ISO 8044 (corrosion terms and definitions)
• ISO 8407 (removal of corrosion products)
• ISO 11463 (guidelines for pitting corrosion evaluation)

Keywords: ISO 16784-2:2024, cooling water treatment, pilot-scale test rig, corrosion and fouling, industrial cooling water systems, heat exchanger testing, cooling tower, corrosion rate, test methods.