Energi- och värmeöverföring

Ämnesområden: Tryckkärl; Värmepumpar; Kylteknik
Kommittébeteckning: SIS/TK 243 (Kyl- och värmepumpsanläggningar - Säkerhet)
Källa: CEN
Svarsdatum: den 5 okt 2023
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This document specifies the requirements for material, design, manufacturing, testing and documentation for stationary pressure vessels intended for use in refrigerating systems and heat pumps. These systems are referenced in this document as refrigerating systems as defined in EN 378-1:2016.
The term "refrigerating system" used in this document includes heat pumps.
This document applies to vessels, including welded or brazed attachments up to and including the nozzle flanges, screwed, welded or brazed connectors, or to the edge to be welded or brazed at the first circumferential joint connecting piping or other elements.
This document applies to pressure vessels with an internal pressure down to -1 bar, to account for the evacuation of the vessel prior to charging with refrigerant.
This document applies to both the mechanical loading conditions and thermal conditions as defined in EN 13445-3:2014 associated with refrigerating systems. It applies to pressure vessels subject to the maximum allowable temperatures for which nominal design stresses for materials are derived using EN 13445-2:2014 and EN 13445-3:20141 or as specified in this document. In addition, vessels designed to this document can have a maximum allowable temperature not exceeding 200 °C and a maximum design pressure not exceeding 160 bar. Outside of these limits, it is important that the EN 13445 series be used for the design, construction and inspection of the vessel. Under these circumstances, it is important that the unique nature of refrigerating plant, as indicated in the introduction to this document, also be taken into account.
It is important that pressure vessels used in refrigerating systems and heat pumps of category less than II as defined in Annex H comply with other relevant clauses of EN 378-2:2016 for vessels.
This document applies to pressure vessels where the main pressure bearing parts are manufactured from metallic ductile materials as defined in Clause 4 and Annex I o ...

Ämnesområden: Tryckkärl; Värmepumpar; Kylteknik
Kommittébeteckning: SIS/TK 243 (Kyl- och värmepumpsanläggningar - Säkerhet)
Källa: CEN
Svarsdatum: den 5 okt 2023
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ISO 7029:2017 provides descriptive statistics of the hearing threshold deviation for populations of otologically normal persons of various ages under monaural earphone listening conditions. It specifies the following, for populations within the age limits from 18 years to 80 years for the range of audiometric frequencies from 125 Hz to 8 000 Hz: a) the expected median value of hearing thresholds given relative to the median hearing threshold at the age of 18 years; b) the expected statistical distribution above and below the median value. For the frequencies from 3 000 Hz to 8 000 Hz, the median and statistical distribution for populations above 70 years are presented for information only. ISO 7029:2017 also provides for information the expected median values at audiometric frequencies from 9 000 Hz to 12 500 Hz within the age limits from 22 years to 80 years.

Kommittébeteckning: SIS/TK 405 (Kärnenergi)
Källa: ISO
Svarsdatum: den 9 okt 2023
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This document deals with the terminological data used in the standards regarding the standardization and promotion of good practices associated with the planning, design, construction, operation and decommissioning of installations, processes and technologies involving radioactive materials.
The vocabulary of nuclear installations, processes and technologies includes fuel cycle, ex-reactor nuclear criticality safety, analytical methodologies, transport of radioactive materials, materials characterization, radioactive waste management and decommissioning.

Ämnesområden: Värmepumpar; Kylteknik
Kommittébeteckning: SIS/TK 243 (Kyl- och värmepumpsanläggningar - Säkerhet)
Källa: CEN
Svarsdatum: den 26 okt 2023
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This document provides the qualification procedure for type approval of the tightness of hermetically sealed and closed components, joints and parts used in refrigerating systems and heat pumps as described in relevant parts of ISO 5149. The sealed and closed components, joints and parts concerned
are, in particular, fittings, bursting discs, flanged or fitted assemblies. The tightness of flexible piping made from non-metallic materials is dealt with in ISO 13971. Metal flexible piping are covered by this document.
The requirements contained in this document are applicable to joints of maximum DN 50 and components of internal volume of maximum 5 l and maximum weight of 50 kg.
This document is intended to characterize their tightness stresses met during their operations, following the fitting procedure specified by the manufacturer, and to specify the minimal list of necessary information to be provided by the supplier of a component to the person in charge of carrying out this procedure.
It specifies the level of tightness of the component, as a whole, and its assembly as specified by its manufacturer.
It applies to the hermetically sealed and closed components, joints and parts used in the refrigerating installations, including those with seals, whatever their material and their design are.
This document specifies additional requirements for mechanical joints that can be recognized as hermetically sealed joints.

Ämnesområden: ; Bränslesystem
Kommittébeteckning: SIS/TK 410 (Vätgasteknik)
Källa: ISO
Svarsdatum: den 2 nov 2023
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1.1 Inclusions
This document establishes requirements for newly produced compressed hydrogen gas fuel system components, as listed below, that are intended for use on hydrogen gas powered land vehicles:
a) check valves (see Clause 8);
b) manual valves (see Clause 9);
c) manual container valves (see Clause 10);
d) automatic valves and automatic container valves (see Clause 11);
e) hydrogen injectors (see Clause 12);
f) pressure sensors, temperature sensors, and pressure gauges (see Clause 13);
g) pressure regulators (see Clause 14);
h) pressure relief valves (PRV) (see Clause 15);
i) pressure relief devices (PRD) (see Clause 16, and refer to ISO 19882);
j) excess flow valves (see Clause 17);
k) gastight housing and leakage capture passages (see Clause 18);
l) rigid fuel lines (see Clause 19);
m) flexible fuel lines, hoses, and assemblies (see Clause 20);
n) filter assemblies (see Clause 21);
o) fittings (see Clause 22);
p) non-metallic, low-pressure rigid fuel lines (see Clause 23); and
q) discharge line closures (see Clause 24).
NOTE Other components not specifically identified here can be examined to meet the criteria of ISO 19887 and tested according to the appropriate functional needs

1.2 Applicability
This document applies to components that have a nominal working pressure, as specified by the manufacturer, of 25 MPa, 35 MPa, 50 MPa, or 70 MPa at 15 °C, referred to in this document as the following pressure classes:
a) “H25” – 25 MPa;
b) “H35” – 35 MPa;
c) “H50” – 50 MPa; and

d) “H70” – 70 MPa.

Other nominal working pressure for hydrogen gas besides those defined are allowed if the required qualification test requirements of this document are met.
This document also applies to components downstream of the first stage of pressure reduction with a maximum operating pressure designated by the manufacturer in MPa or kPa.
1.3 Exclusions
This document does not apply to the following:
a) hydrogen gas fuel system components incorporated during the manufacture of motor vehicles originally manufactured in compliance with the international regulations on hydrogen and fuel cell vehicles such as UN GTR No. 13, UN Regulation No. 134, UN Regulation No. 146, or IEC 62282-4 101;
b) fuel containers;
c) stationary power generation applications;
d) container mounting hardware;
e) electronic fuel management;
f) refuelling receptacles; or
g) components intended for liquid hydrogen.