Fluid Systems Standards: October 2025 Monthly Overview

Looking back at October 2025, the Fluid Systems and Components for General Use sector saw a notable wave of standardization activity. Five key standards, spanning cryogenic centrifugal pumps, fan acoustics, heat recovery ventilators, buried thermoplastic piping systems, and explosion isolation flap valves, were published during this period. This monthly retrospective overview is designed to help industry professionals, compliance officers, engineers, quality managers, and researchers not only catch up with what they may have missed, but also to identify strategic priorities and emerging patterns within the sector.

These standards collectively reflect a strong push towards greater safety, improved energy performance, advanced system acoustics, and more robust guidance for harsh or demanding operational environments. This analytical summary distills the impacts of each new or revised document, compares their approaches, and suggests practical actions for organizations striving to remain at the forefront of compliance and good practice.

Monthly Overview: October 2025

October 2025 marked a prolific month for standardization within the Fluid Systems and Components for General Use sector. The publication cycle featured:

• Updates tackling both legacy and emerging technical risks
• Refined procedures for performance testing and integrity verification
• Enhanced harmonization with related international and European standards
• Guidance tailored for specialized applications, from cryogenic service to underground installations

Compared to past periods, this cluster of standards underscores increasing integration between energy efficiency (as with heat recovery ventilators), acoustics (fan testing), explosion safety, and mechanical system integrity. It also highlighted a shift towards aligning specification and testing requirements on a global scale—addressing not just equipment but also the environments and operational scenarios in which these components are installed.

The month's publications signal an ongoing response to challenges such as stricter energy codes, workplace and process safety regulations, and the maintenance of reliable, high-performance fluid systems in complex, distributed environments.

Standards Published This Month

ISO 24490:2025 - Cryogenic Vessels: Centrifugal Pumps for Cryogenic Service

Cryogenic vessels - Centrifugal pumps for cryogenic service

ISO 24490:2025 provides comprehensive minimum requirements for the design, manufacturing, and testing of centrifugal pumps intended for cryogenic service—critical in applications handling liquefied gases such as liquid nitrogen, oxygen, or hydrogen. This standard does not address reciprocating pumps but does offer guidance on the broader design of installations and references key materials standards for cryogenic service.

Key requirements include:

• Conformance to appropriate general standards unless superseded by ISO 24490 provisions
• Strict criteria for material selection based on toughness, corrosion resistance, and compatibility with cryogenic and flammable fluids
• Engineering guidance to prevent mechanical failures due to low temperature embrittlement, particle contamination, and over-pressurization
• Detailed protocols for prototype and production testing (including hydrostatic and performance tests)
• Cleanliness, marking, and installation design guidance

Primarily aimed at manufacturers, system integrators, and facilities engineers operating cryogenic storage and handling infrastructure, ISO 24490 fits alongside a suite of standards governing material compatibility (e.g., ISO 21010, ISO 21028-1), and harmonizes technical detail with safety and reliability imperatives evident in related standards.

Key highlights:

• Revised to focus exclusively on centrifugal pumps (excluding reciprocating designs)
• Expanded safety guidance for hazardous fluids (oxygen and hydrogen)
• Enhanced test procedures and prototype verification protocols

Access the full standard:View ISO 24490:2025 on iTeh Standards

ISO 13347-2:2025 - Fans: Sound Power Level Determination by Reverberant Room Method

Fans - Determination of fan sound power levels under standardized laboratory conditions - Part 2: Reverberant room method

Acoustic emissions are a growing concern in fluid systems design, both for environmental and occupational safety. ISO 13347-2:2025 specifies laboratory methods to determine the sound power levels of fans by measuring sound pressure in a reverberant room, supporting direct comparison across equipment types and installation categories.

This standard:

• Defines test setups and instrumentation for characterizing airborne sound emissions
• Applies to the full range of fan sizes and types (subject only to practical test facility size)
• Deals with fans combined with ancillary noise-control devices (e.g., silencers, roof cowls)
• Stress important limitations: it is not suitable for in-situ (field) measurements due to uncontrolled acoustic environments
• Provides harmonization for terminology, symbols, and performance parameters (aligned with ISO 5801 and related standards)

Key users include HVAC designers, acoustical consultants, fan manufacturers, test laboratories, and regulatory bodies looking to enforce or meet workplace noise requirements. Integration with ISO 5136 (in-duct method) and ISO 10302-1 (small fans) ensures comprehensive coverage of ducted and unducted system testing.

Key highlights:

• Incorporates updates for installation category E fans and harmonizes symbols
• Enables sound emission comparison and product compliance evaluation
• Not for field measurement—strictly for controlled lab conditions

Access the full standard:View ISO 13347-2:2025 on iTeh Standards

ISO 5222-1:2025 - Heat Recovery Ventilators: Testing and Calculating Sensible Heating Recovery

Heat recovery ventilators and energy recovery ventilators - Testing and calculating methods for performance factor - Part 1: Sensible heating recovery seasonal performance factors of heat recovery ventilators (HRVs)

The drive for energy efficiency and indoor environmental quality has propelled the need for accurate assessment of ventilation technologies. ISO 5222-1:2025 standardizes test and calculation methods for evaluating the seasonal sensible heating recovery performance factor (Fsh) of heat recovery ventilators (HRVs). It instructs how to measure, compute, and report HRV performance for labeling and product comparison—enabling more transparent selection and regulatory enforcement.

The standard delineates:

• Mandatory test conditions and procedures for quantifying sensible heat transfer efficiency
• Calculation formulas for seasonal performance factor according to temperature ‘bin’ distributions
• Guidelines for bypass functions (used for energy saving in moderate climates)
• Comprehensive reporting templates for performance documentation

This document is intended for use by manufacturers, testing laboratories, engineers, and certification bodies involved in product development, procurement, or code compliance for building ventilation and energy efficiency systems. It is harmonized with ISO 16494-1 and aligns technical terms, formulas, and procedures with related performance rating standards.

Key highlights:

• Updated terminology and calculation methods for performance metrics
• Focuses on marking and comparison purposes rather than direct design or operational guidance
• Facilitates accurate benchmarking for HVAC energy certification programs

Access the full standard:View ISO 5222-1:2025 on iTeh Standards

CEN/TS 15223:2025 - Structural Design of Buried Thermoplastics Piping Systems

Plastic piping systems - Structural design of buried thermoplastics piping systems - Procedure and guidance under various conditions of loading

Robust underground infrastructure is foundational to modern fluid systems across civil, municipal, and industrial sectors. CEN/TS 15223:2025 provides a detailed procedural and methodological framework for the structural design of buried thermoplastic (plastic) piping systems, including both solid and structured wall pipes used in non-pressure and pre-pressurized applications.

Major elements include:

• Explanation of design by validated field experience (graphical method) for small-diameter systems
• Calculation-based design methods for large-diameter pipes, including stepwise assessment of ring stiffness, soil-structure interaction, and allowable deflection under varying load and installation scenarios
• Integration of key terms, symbols, and calculation factors for soil pressure, deflection, and buckling
• Practical guidance that acknowledges variability in soil conditions and installation environments, supporting designers/specifiers through best-judgment principles
• Strong referencing of national regulations and codes (e.g., EN 476, EN 1295-1, EN 1610)

CEN/TS 15223 specifically targets pipeline designers, civil and municipal engineers, and utility asset managers responsible for ensuring the integrity and long-term performance of underground piping networks. Its revised edition incorporates new calculation methods, example scenarios, and expanded recommendations for challenging installation contexts.

Key highlights:

• Broadened scope and revised approach to design procedures
• New calculation methodologies for larger diameters and specialized conditions
• Guidance supports both pressure and non-pressure applications during installation

Access the full standard:View CEN/TS 15223:2025 on iTeh Standards

prEN 16447 - Explosion Isolation Flap Valves

Explosion isolation flap valves

Safety in fluid and powder transport systems, especially regarding dust explosions, remains paramount. prEN 16447 sets out general requirements for flap valves used as explosion isolation devices. These specialized valves are designed to prevent the propagation of dust explosions via pipes or ducts from one part of a plant to other connected systems, thus limiting potential catastrophic damage and injury.

Key features are:

• Applicability to valves used exclusively for dust explosion events propagating against the normal process flow (not in the direction of normal flow)
• Performance test procedures for evaluating efficacy, mechanical integrity, and installation compatibility—including influence of bends, pipe restrictions, flow velocities, and vessel volumes
• Delineation of scope (e.g., not for gas, vapor, chemically unstable, explosive, or pyrotechnic substances)
• Requirements for mechanical locking, monitoring, and dust accumulation signals to ensure ongoing functional integrity
• Recommendations for risk assessment and integration with related explosion protection measures (venting, suppression, or explosion-resistive construction)

Target audiences include industrial safety professionals, plant system engineers, equipment manufacturers, and explosion protection specialists operating in sectors such as food processing, chemical, or pharmaceutical manufacturing.

Key highlights:

• Aligned with evolving EU directives on explosion protection
• Incorporates detailed installation, testing, and functional verification protocols
• Focused solely on dust explosion isolation; highlights limitations and residual risks

Access the full standard:View prEN 16447 on iTeh Standards

Common Themes and Industry Trends

A clear pattern emerging from October 2025’s standards is the intense focus on system safety, durability, and performance measurement:

• Safety and risk prevention: Explosion isolation, cryogenic compatibility, and buried infrastructure design reflect higher regulatory scrutiny and the need to mitigate catastrophic risks across process sectors.
• Energy efficiency and sustainability: With ISO 5222-1, the industry is prioritizing quantifiable measurement and transparent reporting of HVAC system performance, echoing global energy and climate objectives.
• Acoustic performance: ISO 13347-2 spotlights both environmental concerns (e.g., urban noise) and occupational health—ensuring systems meet not only technical but also comfort and safety requirements for modern buildings and plants.
• Standard harmonization: Many documents explicitly reference international and European standards, signifying a trend toward streamlined global compliance frameworks and joint technical guidance.
• Flexible, scenario-based guidance: Documents like CEN/TS 15223 and prEN 16447 offer guidance for variable installation, operational, and risk circumstances—acknowledging that real-world environments rarely fit standardized models exactly.

Collectively, these themes underscore an era where the boundaries between energy, safety, and reliability are converging—and the technical standards reflect this multidimensional integration.

Compliance and Implementation Considerations

For organizations and professionals affected by these new and updated standards, implementation should be guided by:

• Review and gap analysis: Assess current system designs, performance testing protocols, or installation practices against the latest standard requirements—particularly where newly introduced calculation methods or stricter safety provisions could necessitate design revisions.
• Prioritize system-critical standards: Address requirements with the highest impact on process safety or product compliance first—such as explosion isolation flash valves or cryogenic material compatibility.
• Align with harmonized procedures: Where test methods or measurement protocols are refined or harmonized, ensure in-house or third-party testing aligns (for example, lab acoustic testing for fans or HRV seasonal performance).
• Timeline considerations: Many of these standards are referenced for regulatory, labeling, or product certification purposes. Early adoption and training are recommended, especially for new builds, procurement cycles, or product launches scheduled months after the October 2025 publication date.
• Leverage resources and guidance: Take advantage of the installation, design, and calculation examples, as well as reporting templates included in the standards—these facilitate more consistent implementation and evidence for compliance audits.

For comprehensive resources, users are encouraged to utilize the iTeh Standards platform for access to full-text standards, updates, and cross-referenced documents.

Conclusion: Key Takeaways from October 2025

The surge in standards for the Fluid Systems and Components for General Use sector in October 2025 reflects a mature response to complex technical, regulatory, and environmental challenges:

• Safety and compliance are strongly interlinked with operational performance, and the sector is moving towards comprehensive, scenario-based guidance for installation and testing.
• Energy efficiency and system acoustics have become mainstream performance criteria—not merely optional enhancements.
• Explosion protection and cryogenic reliability are critical for facilities operating in high-risk environments, aligning with international best practices and safeguarding both life and assets.

For professionals, now is the time to:

• Review the published standards in detail (using the direct links above)
• Evaluate organizational readiness for implementation
• Foster cross-disciplinary collaboration (e.g., between safety, engineering, and procurement teams) to streamline compliance and innovation

Staying current with these standards is essential not just for regulatory compliance but for maintaining competitive, safe, and high-performing operations. For a deeper dive into any of the standards covered in this overview, the iTeh Standards platform remains a leading resource for direct access, supplementary guidance, and ongoing updates.