SN EN ISO 24664:2025

Kälteanlagen und Wärmepumpen - Druckentlastungseinrichtungen und zugehörige Leitungen - Berechnungsverfahren (ISO 24664:2024)

Refrigerating systems and heat pumps - Pressure relief devices and their associated piping - Methods for calculation (ISO 24664:2024)

INB

This document describes the calculation of: —     mass flow for sizing pressure relief devices for parts of refrigerating systems; —     discharge capacities for pressure relief valves and other pressure relief devices in refrigerating systems including the necessary data for sizing these when relieving to atmosphere or to part of the refrigerating system at lower pressure; —     the pressure loss in the inlet and outlet lines of pressure relief valves and other pressure relief devices and includes the necessary data. This document specifies the requirements for selection of pressure relief devices to prevent excessive pressure due to internal and external heat sources, the sources of increasing pressure (e.g. compressor, heaters, etc.) and thermal expansion of trapped liquid. NOTE            The term "refrigerating system" used in this document includes heat pumps.

Publikation: 2025-01-0148 SeitenICS: 27.080, 27.200

This page compares SN EN ISO 24664:2025 against ISO 24664:2024 certification differences to help the reader decide which applies to their situation. Understanding these differences is crucial for professionals in the refrigerating systems and heat pumps industry.

SECTION 1

Why compare SN EN ISO 24664:2025 and ISO 24664:2024 certification differences

The comparison of SN EN ISO 24664:2025 and ISO 24664:2024 certification differences arises from the need for clarity among engineers, designers, and regulatory professionals in the refrigerating systems sector. As the industry evolves, the standards governing pressure relief devices and their associated piping also undergo changes. Professionals often seek guidance on which standard is most applicable to their specific needs, particularly when it comes to compliance, safety, and system efficiency. This comparison assists in making informed decisions about certification paths and design methodologies, ensuring adherence to both safety regulations and best practices.

SECTION 2

How SN EN ISO 24664:2025 approaches the topic

SN EN ISO 24664:2025 outlines methods for calculating pressure relief devices and their associated piping specifically in refrigerating systems and heat pumps. This standard emphasizes mass flow calculations, discharge capacities of pressure relief valves, and the pressure drop in inlet and outlet piping. It provides detailed criteria for selecting pressure relief devices while considering the impact of internal and external heat sources and pressure generation by compressors and heaters. Additionally, the standard addresses thermal expansion of trapped liquids, ensuring comprehensive guidance for engineers and technicians in designing and maintaining safe refrigerant systems. The intent is to provide a robust framework for ensuring the operational safety and efficiency of pressure relief systems.

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How ISO 24664:2024 certification differences approaches the topic

ISO 24664:2024 certification differences provide a broader framework for understanding standards applicable to refrigerating systems and heat pumps. This standard encompasses general methodologies for evaluating the performance and safety of pressure relief devices without being limited to specific calculations. It focuses on compliance with international safety standards and regulatory requirements, ensuring that systems meet the expectations set forth by the Pressure Equipment Directive 2014/68/EU. The approach is more generalized, allowing for adaptability across various applications, which can be beneficial for organizations working with diverse refrigerating technologies. By understanding these certification differences, organizations can ensure they select the most relevant standard for their operations and compliance needs.

SECTION 4

Side-by-side comparison

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When to choose which

• If you require specific calculations for pressure relief devices, choose SN EN ISO 24664:2025. This standard is tailored for in-depth analysis in refrigerating systems.
• If your organization needs to comply with international safety regulations without focusing on specific methodologies, opt for ISO 24664:2024. It provides a broader compliance framework suitable for varied applications.
• If you are involved in the design phase of a refrigerating system, select SN EN ISO 24664:2025 for detailed guidance on selection criteria and thermal expansion considerations.
• For organizations with multiple types of pressure relief devices beyond refrigerating systems, ISO 24664:2024 offers the flexibility needed for compliance across different technologies.