EN 12952-5:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserrohrkessel und Anlagenkomponenten - Teil 5: Verarbeitung und Bauausführung für drucktragende KesselteileChaudières à tubes d'eau et installations auxiliaires - Partie 5 : Fabrication et construction des parties sous pression de la chaudièreWater-tube boilers and auxiliary installations - Part 5: Workmanship and construction of pressure parts of the boiler27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12952-5:2011SIST EN 12952-5:2012en,fr,de01-januar-2012SIST EN 12952-5:2012SLOVENSKI
STANDARDSIST EN 12952-5:20021DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12952-5
November 2011 ICS 27.040 Supersedes EN 12952-5:2001English Version
Water-tube boilers and auxiliary installations - Part 5: Workmanship and construction of pressure parts of the boiler
Chaudières à tubes d'eau et installations auxiliaires - Partie 5: Fabrication et construction des parties sous pression de la chaudière
Wasserrohrkessel und Anlagenkomponenten - Teil 5: Verarbeitung und Bauausführung für drucktragende Kesselteile This European Standard was approved by CEN on 10 September 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12952-5:2011: ESIST EN 12952-5:2012

Tube bending procedure tests . 52Annex B (informative)
Welded pressure connections and non-pressure containing attachments . 61Annex C (normative)
Manufacture of welded tubewalls . 62Annex D (normative)
Coiled boilers and coiled superheaters . 69Annex E (normative)
Special requirements for composite tubes . 70Annex F (informative)
Guidelines for the determination of the competency of boiler manufacturers . 72Annex G (informative)
Significant technical changes between this European Standard and the previous edition . 85Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC . 87Bibliography . 88 SIST EN 12952-5:2012

(ISO 148-1:2009) EN ISO 4759-1:2000, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C (ISO 4759-1:2000) EN ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006) EN ISO 6520-1, Welding and allied processes — Classification of geometric imperfections in metallic materials — Part 1: Fusion welding (ISO 6520-1:2007) EN ISO 6892-1:2009, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2009) EN ISO 14555:2006, Welding — Arc stud welding of metallic materials (ISO 14555:2006) EN ISO 15609 (all parts), Specification and qualification of welding procedures for metallic materials — Welding procedure specification
EN ISO 15613, Specification and qualification of welding procedure for metallic materials — Qualification based on pre-production welding test (ISO 15613:2004) EN ISO 15614-1:2004, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
(ISO 15614-1:2004) EN ISO 17638:2009, Non-destructive testing of welds — Magnetic particle testing (ISO 17638:2003) EN ISO 17663:2009, Welding — Quality requirements for heat treatment in connection with welding and allied processes (ISO 17663:2009) EN ISO 23277:2009, Non-destructive testing of welds — Penetrant testing of welds — Acceptance levels (ISO 23277:2006) EN ISO 23278:2009, Non-destructive testing of welds — Magnetic particle testing of welds — Acceptance levels (ISO 23278:2006) CEN ISO/TR 15608, Welding — Guidelines for a metallic material grouping system (ISO/TR 15608:2005) 3 Terms and definitions For the purposes of this document the terms and definitions given in EN 12952-1:2001 and the following apply. 3.1 cold forming for ferritic steels, it is forming at temperatures below the maximum permissible temperature for post-weld heat treatment and for austenitic materials it is forming at temperatures below 300 °C NOTE See Table 10.4-2. 3.2 hot forming for ferritic steels, it is forming at temperatures at or above the maximum permissible temperature for post-weld heat treatment SIST EN 12952-5:2012

EN 1759-1:2004. Bolted flanges in accordance with c) shall not be used where the bolts would be exposed to gases of combustion. 6.1.3 Material for header ends Header ends shall be forged or machined from steel of a grade compatible with the bodies of the headers and profiled as shown in EN 12952-3:2011, Figure 10.3-1. SIST EN 12952-5:2012

is the required minimum thickness at the extrados, in mm; eact is the nominal thickness of the supplied tube minus the supplier's maximum negative thickness tolerance, in mm; rb
is the radius of the bend measured to the centre-line of the tube in mm; do
is the nominal outside diameter of the tube, in mm. When the measured value on the tube bend is less than eext reference shall be made to the minimum calculated thickness given in EN 12952-3:2011, 11.3. The thinning on the extrados of bends formed in two stages i.e. hot formed after initial hot or cold bending, shall not exceed 30 % of the thickness of the straight tube local to the bend as measured during a procedure test. 7.3.5 Thickening at the tube bend intrados for tubes of nominal outside diameter above 80 mm and including 142 mm The thickness at any point after bending shall not be less than that given by equation: 1/25,0/2obobactint−−×=drdree (7.2) where eint
is the required minimum thickness at the intrados, in mm; eact is the nominal thickness of the supplied tube minus the supplier's maximum negative thickness tolerance, in mm; rb
is the radius of the bend measured to the centre-line of the tube, in mm; do
is the nominal outside diameter of the tube, in mm. When the measured value on the tube bend is less than eint reference shall be made to the minimum calculated thickness given in EN 12952-3:2011, 11.3. 7.3.6 Thinning/thickening at the tube bend extrados/intrados for tubes of nominal outside diameter
greater than 142 mm For tubes above 142 mm diameter comparison shall be made directly with the calculated thickness given in EN 12952-3:2011, 11.3. The calculated thickness shall be stated on the drawing. SIST EN 12952-5:2012

Key a departure from circularity u b ratio rb/do Figure 7.3-1 — Limits of departure from circularity for single operation bending SIST EN 12952-5:2012

Key a departure from circularity u b ratio rb/do Figure 7.3-2 — Limits of departure from circularity for double operation bending 7.3.8 Post bend heat treatment of tube bends The post-bend heat treatment (PBHT) of hot or cold formed bends shall be in accordance with the following rules: a) all hot formed tube bends and cold formed bends requiring heat treatment after bending, including bends hot formed after cold bending, shall be heat treated in accordance with the requirements of 7.3.9 except as defined in b) or e) below; b) hot formed tube bends in steel group 1, with outside diameters of 80 mm or less, need not receive a post-bend heat treatment if it can be demonstrated that the bending operation was completed within the normalizing range as defined in the relevant base material standard, or data sheet, as appropriate; c) all cold bent tube bends with thinning greater than 25 % as measured in the procedure test, shall be heat treated in accordance with the requirements of 7.3.9; d) PBHT of cold formed tube bends in accordance with Table 7.3-2 shall be carried out in accordance with the requirements of 7.3.9; Table 7.3-2 — Post-bend heat treatment applicable to cold formed tube bends do mm Bend ratio Heat treatment do > 142 rb/do > 2,5 No post-bend heat treatment required do > 142 rb/do ≤ 2,5 Stress relieve do ≤ 142 rb/do > 1,3 No post-bend heat treatment required do ≤ 142 rb/do ≤ 1,3 Stress relieve
do, do2, do3, do4, -------etc is the actual outside diameter of the tube at the position being measured. NOTE For clarity, the ripples have been exaggerated. Figure 7.3-3 — Ripples on tube bends For such ripples to be acceptable, both the following conditions shall be satisfied: Amplitude of the ripples hm = 0,5 (do2 + do4) – do3 < 0,03 do
(7.4) Wave pitch a > 12 hm
(7.5) SIST EN 12952-5:2012
the tolerances given in Table 7.4-1. Table 7.4-1 — Offset of middle lines for longitudinal joints in cylindrical components Plate thickness ea mm Offset of middle lines mm ea ≤ 10 ≤ 1 10 < ea ≤ 50 ≤ ea/10 or 3, whichever is the smaller e
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