EN 14276-2:2020/prA1
(Amendment)Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements
Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements
1.1 This document specifies the requirements for material, design, manufacturing, testing and documentation for stationary piping intended for use in refrigerating systems, heat pumps and secondary cooling and heating systems. These refrigerating systems and heat pump 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.
1.2 This document applies to piping, including welded or brazed attachments up to and including the 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.
1.3 This document applies to the selection, application and installation of safety accessories intended to protect the piping during the various phases of the refrigeration cycle.
1.4 This document applies to the following piping:
- heat exchanger consisting of piping for the purpose of cooling or heating air where piping aspects are predominant;
- piping incorporated into an assembly (e.g. self-contained system, condensing unit);
- field erected piping.
1.5 This document applies to piping with an internal pressure down to -1 bar, to account for the evacuation of the piping prior to charging with refrigerant.
1.6 This document applies to both the mechanical loading conditions and thermal conditions as defined in EN 13445 3:2014/A5:2018 associated with refrigerating systems. It applies to piping subject to the maximum allowable temperatures for which nominal design stresses for materials are derived using EN 14276-1:2020 or as specified in this document. In addition, piping designed to this document will have a maximum design temperature not exceeding 200 °C and a maximum design pressure not exceeding 160 bar. Outside of these limits, the EN 13480 series can be used for the design construction and inspection of the piping. Under these circumstances, the unique nature of a refrigerating plant, as indicated in the introduction of EN 14276-1:2020, will also be taken into account.
1.7 This document applies to piping where the main pressure bearing parts are manufactured from metallic ductile materials as defined in Clause 4 and in EN 14276-1:2020.
Druckgeräte für Kälteanlagen und Wärmepumpen - Teil 2: Rohrleitungen - Allgemeine Anforderungen
Équipements sous pression pour systèmes de réfrigération et pompes à chaleur - Partie 2 : Tuyauteries - Exigences générales
Tlačna oprema za hladilne sisteme in toplotne črpalke - 2. del: Cevovodi - Splošne zahteve - Dopolnilo A1
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2023
Tlačna oprema za hladilne sisteme in toplotne črpalke - 2. del: Cevovodi - Splošne
zahteve - Dopolnilo A1
Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General
requirements
Druckgeräte für Kälteanlagen und Wärmepumpen - Teil 2: Rohrleitungen - Allgemeine
Anforderungen
Équipements sous pression pour systèmes de réfrigération et pompes à chaleur - Partie
2 : Tuyauteries - Exigences générales
Ta slovenski standard je istoveten z: EN 14276-2:2020/prA1
ICS:
23.020.32 Tlačne posode Pressure vessels
27.080 Toplotne črpalke Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
EN 14276-2:2020
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
July 2023
ICS
English Version
Pressure equipment for refrigerating systems and heat
pumps - Part 2: Piping - General requirements
Équipements sous pression pour systèmes de Druckgeräte für Kälteanlagen und Wärmepumpen -
réfrigération et pompes à chaleur - Partie 2 : Teil 2: Rohrleitungen - Allgemeine Anforderungen
Tuyauteries - Exigences générales
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 182.
This draft amendment A1, if approved, will modify the European Standard EN 14276-2:2020. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.
This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14276-2:2020/prA1:2023 E
worldwide for CEN national Members.
Contents
European foreword . 3
1 Modification to Clause 1 . 4
2 Modification to Clause 2 . 4
3 Modification to Clause 3 . 5
4 Modification to Clause 4 . 5
5 Modification to Clause 5 . 6
6 Modification to Clause 6 . 6
7 Modification to Clause 7 .33
8 Modification to Annex ZA .36
Annex ZA (informative) Relationship between this European Standard and the
essential requirements of EU Directive 2014/68/EU aimed to be covered .37
European foreword
This document (EN 14276-2:2020/prA1:2023) has been prepared by Technical Committee
CEN/TC 182 “Refrigerating systems, safety and environmental requirements”, the secretariat of
which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an
integral part of this document.
1 Modification to Clause 1
Update the following references throughout the clause:
— EN 378-1:2016+A1:2020;
— EN 13480-3:2017/A5:2022;
— EN 13480-3:2017, including A2:2020, A3:2020 and A1:2021;
— EN 14276-1:2020/prA1:2023.
2 Modification to Clause 2
Update the following references throughout the clause:
— EN 378-1:2016+A1:2020;
— EN 378-3:2016+A1:2020;
— EN 378-4:2016+A1:2019;
— EN 764-1:2015+A1:2016;
— EN 12735-1:2020;
— EN 13445-3:2021;
— EN 13445-5:2021;
— EN 13480-2:2017;
— EN 13480-3:2017;
— EN ISO 2553:2019;
— EN ISO 3452-1:2021;
— EN ISO 10893-8:2011;
— EN ISO 10893-11:2011;
— EN ISO 17640:2018;
Document impacted by A1:2018, A2:2018, A3:2018, A7:2020 and A8:2021
Document impacted by A1:2021, A2:2020, A3:2020, A4:2021 and A5:2022.
Document impacted by A1:2020.
Document impacted by A1:2020.
— ISO 817:2014.
3 Modification to Clause 3
Replace definition 3.1.1 as follows:
3.1.1
coil
heat exchanger consisting of pipe or tubing (more particularly made from one or more bent pipes)
used to cool or heat air considered only as a piping
Add the following new definitions:
3.1.2
nominal diameter of the fitting
DN of the pipe connected to this fitting
3.1.3
fitting
device used in a tube system for the purpose of connecting the tubes or pipes either to each other
or to a component part of the piping
3.1.4
socket
type of end defined with its internal diameter
3.1.5
male end
type of end defined with its external diameter
3.1.6
reducer
fitting or an adapter used to enable connections between pipework components of different
nominal diameters
4 Modification to Clause 4
Update the following references throughout the clause:
— EN 14276-1:2020/prA1:2023;
— EN 13480-2:2017 ;
— EN 13445-2:2021.
In 4.3.1.2, replace “copper groups: 31, 32, 33, 34, 35t, included in EN 1653:1997, EN 12735-1:2016,
EN 12735 2:2016” with “copper groups: 31 to 38, included in EN 1653:1997, EN 12735-1:2020,
EN 12735-2:2016”.
Document impacted by A1:2017 and A2:2021.
Replace 4.3.2 as follows:
4.3.2 Special considerations including brittle fracture
The requirements of EN 14276-1:2020, shall apply as follows:
— For all materials: see 4.3.1.3 to 4.3.1.7;
— For steel: see 4.3.2;
— For aluminium: see 4.3.3;
— For copper: see 4.3.4.
The brittle fracture should be determined only when the material thickness can permit to make a
test piece according to EN ISO 148-1 with a minimum section size 5 mm × 10 mm
Delete 4.4 and replace 4.5 and 4.6 as follows:
4.4 Material documentation
The requirements of EN 14276-1:2020/prA1:2023, 4.4 shall apply.
4.5 Materials for non-pressure retaining parts
The requirements of EN 14276-1:2020/prA1:2023, 4.5 shall apply.
5 Modification to Clause 5
In the first line of Table 2 replace “EN 14276-2:2020” with “EN 14276-1:2020/prA1:2023, 5.2”.
6 Modification to Clause 6
Update the following references throughout the clause:
— EN 14276-1:2020/prA1:2023;
— EN 13480-2:2017 ;
— EN 13445-2:2021;
— EN 378-3:2016+A1:2020;
— EN 378-4:2016+A1:2019.
Replace 6.5 as follows:
6.5 Calculation temperature tc
The calculation temperature, t , shall be the maximum temperature likely to be reached at the
c
mid-thickness of the piping, under normal operating conditions, at the calculation pressure p . The
c
calculation temperature shall be determined as indicated below. Any heat transfer calculation
shall be performed on the assumption that there is no heat loss due to wind or other external
influence.
a) For externally uninsulated components, the calculation temperature shall be as follows:
1) For fluid temperatures below 40 °C, the calculation temperature for the component shall
be taken as the fluid temperature;
2) For fluid temperatures of 40 °C and above, unless a lower average wall temperature is
determined with test or heat transfer calculation, the calculation temperature for
uninsulated components shall be not less than the following values, but not less than
40°C:
i) 95 % of the fluid temperature for valves, pipes, ends, welding fittings, and other
components having wall thickness comparable to that of the pipe;
ii) 90 % of the fluid temperature for flanges (except lap joint flanges) including those on
fittings and valves;
iii) 85 % of the fluid temperature for lap joint flanges;
iv) 80 % of the fluid temperature for bolting.
b) For externally insulated piping components, the component calculation temperature shall be
the fluid temperature TS unless calculations, tests, or service experience based on
max
measurements, support the use of another temperature. Where piping is heated or cooled
with tracing or jacketing, this effect shall be considered in establishing component calculation
temperatures;
c) Where the piping is heated or cooled with tracing or jacketing, the calculation temperature
shall be determined with test or taken to be equal to the temperature determined in a) or b)
+ 50 K.
The manufacturer when selecting the heater shall quantify the risk that exists of overheating for
the fluid or for the material and shall take appropriate measures to restrict this risk with for
example the inclusion of safety accessories and/or the inclusion of appropriate warning labels
and/or adding instructions to the documentation.
Replace Table 3 as follows:
Joint coefficients 1 1 0,85 0,7
a
Testing groups 1b 2b 3b 4
Permitted material
Steel group 1.1/1.2/8.1 1.1/1.2/8.1 1.1/1.2/8.1 1.1/1.2/8.1
Aluminium group 21 / 22 21 / 22 21 / 22 21 / 22
Copper group All All All all
Maximum thickness per material category
b
Steel group 1.1 / 8.1 Unlimited ≤ 50 ≤ 50 ≤ 16
b
Steel group 1.2 Unlimited ≤ 30 ≤ 30 ≤ 12
b
Aluminium group 21 Unlimited ≤ 40 ≤ 40 ≤ 20
b
Copper group all Unlimited ≤ 40 ≤ 40 ≤ 20
b b b
Welding process Unlimited Fully mechanical Unlimited Unlimited
c
welding only
b b b
Service temperatures Unlimited Unlimited Unlimited ̶ 50 °C + 200 °C
range
Groups of fluid 1/2 1/2 1/2 1/2
Extent of VT 100 % 100 % 100 % 100 %
d e
Extent of NDT other 100 % 100–10 % 10 % 0 %
than VT of governing
welded joints
a
Definition of testing groups with analogy with EN 13480-5:2017. All testing groups require visual
examination.
b
Unlimited means no additional restriction due to testing. The limitations mentioned in the table are
limitations imposed with testing. Other limitations given in various clauses of this document (such as
design, material limitations) shall also be taken in account.
c
Fully mechanized and/or automatic welding process where at least the weld head and the welding
consumable movement is mechanized.
d
First figure applies initially; second figure applies after experience. For definition of experience see
EN 13445-5:2021. The percentage relates to the percentage of welds of each individual vessel.
e
The extent of NDT other than VT can be substituted with destructive testing for group 2b.
Replace 6.9.1.2 as follows:
The piping is subject to a pressure not less than 3 times PS without rupture.
Test temperature is done at the ambient temperature.
If the design temperature exceeds 125°C, the piping is subject to a pressure not less than
f
test
3××PS .
f
Replace 6.9.1.3 as follows:
6.9.1.3 Type fatigue proof test
The test procedure and acceptance criteria are the following if the design temperature is not
higher than 125 °C:
a) 3 samples are tested at 2 times PS;
b) 3 other samples are subjected to the following test steps:
step 1: Test at PS without permanent deformation and leaks;
step 2: 250 000 cycles between 0,2 PS or lower and 0,7 PS or higher;
step 3: Test according to EN 14276-1:2020/prA1:2023, Formula (C.1).
During the test procedure, none of the 6 samples shall rupture, burst or leak.
The test procedure and acceptance criteria are the following if the design temperature is
above 125 °C:
f
test
c) 3 samples are tested at 2××PS ;
f
d) 3 other samples are subjected to the following test steps:
f
test
step 1: Test at ×PS without permanent deformation and leaks;
f
f
test
step 2: 250 000 cycles between 0,2 PS or lower and 0,7××PS or higher;
f
step 3: Test according to EN 14276-1:2020/prA1:2023, Formula (C.1).
During the test procedure, none of the 6 samples shall rupture, burst or leak.
Replace 6.9.2 as follows:
6.9.2 Design with formula (DBF)
6.9.2.1 Straight piping
The minimum required thickness without corrosion allowance and tolerances, e for a straight
c
pipe shall be calculated as follows:
where D /D ≤
...
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