Welding - Basic welded joint details in steel - Part 1: Pressurized components

The purpose of this European Standard is to exemplify commonly accepted welded connections in pressure systems. It does not promote the standardization of connections that may be regarded as mandatory or restrict development in any way. Stress analysis rules should be considered if necessary.
This standard contains examples of connections welded by:
-   Manual metal-arc welding with covered electrode (111);
-   Submerged arc welding (12);
-   Gas shielded metal arc welding (13);
-   Tungsten inert gas arc welding; TIG-welding (14);
-   Plasma arc welding (15)
processes (process numbers according to EN ISO 4063) in steel pressure systems. Other processes by agreement.
This standard covers welded joint details in steel, but can be applied to other metallic materials. In such cases the shape and dimensions of the weld should be checked.
The estimation of the suitability of welded connections for special service conditions, for example corrosion and fatigue are not specially considered.

Schweißen - Verbindungselemente beim Schweißen von Stahl - Teil 1: Druckbeanspruchte Bauteile

Diese Norm enthält beispielhaft allgemein übliche Schweißverbindungen an druckbeanspruchten Bauteilen.
Sie ersetzt nicht die Normung von vorgeschriebenen Verbindungen oder schränkt die Entwicklung in
irgendeiner Weise ein. Falls erforderlich, sind die Regeln der Spannungsberechnung zu beachten.
Die Norm enthält Beispiele von Schweißverbindungen, die nach folgenden Prozessen geschweißt werden:
- Lichtbogenhandschweißen mit umhüllter Stabelektrode (111);
- Unterpulverschweißen (12);
- Metallschutzgasschweißen (13);
- Wolfram-Inertgasschweißen; WIG-Schweißen (14);
- Plasmaschweißen (15).
Prozesse (Prozessnummern nach EN ISO 4063) an Stahl für Drucksysteme. Andere Verfahren nach
Vereinbarung.
Die Norm deckt Verbindungselemente beim Schweißen von Stahl ab, kann aber auch auf andere metallische
Werkstoffe angewandt werden. In diesen Fällen sollten die Form und das Abmaß der Schweißverbindung
geprüft werden.
Die Eignung dieser Schweißverbindungen für besondere Betriebsbedingungen, z. B. Korrosion und
Ermüdung, wird nicht besonders berücksichtigt.

Soudage - Descriptif de base des assemblages soudés en acier - Partie 1: Composants soumis à la pression

L’objet de la présente Norme européenne est de présenter les assemblages soudés communément acceptés
dans les récipients à pression. Elle ne promeut aucunement la normalisation d’assemblages qui puissent être
considérés comme obligatoires, pas plus qu’elle ne restreint en aucune façon le développement. Il convient, si
nécessaire, de prendre les règles d’analyse des contraintes en considération.
La présente norme contient des exemples de soudures effectuées par :
- soudage manuel à l’arc avec électrode enrobée (111) ;
- soudage à l’arc sous flux en poudre (12) ;
- soudage à l’arc sous protection de gaz avec fil électrode fusible (13) ;
- soudage à l’arc en atmosphère inerte avec électrode de tungstène, procédé TIG (14) ;
- soudage plasma (15)
(références de procédé conformes à l’EN ISO 4063) dans les récipients à pression en acier. Les principes de
cette norme peuvent s’appliquer à d’autres procédés sur accord.
La présente norme couvre les détails des joints soudés pour l’acier, mais peut être appliquée à d’autres
matériaux métalliques. Dans de tels cas, il convient que soient vérifiées les formes et dimensions de la
soudure.
L’estimation de l’adaptation des assemblages soudés à des conditions d’utilisation particulières, comme la
corrosion et la fatigue n’est pas particulièrement examinée.

Varjenje - Opisi zvarnih spojev na jeklu - 1. del: Tlačne komponente

Namen tega evropskega standarda je ponazoriti splošno sprejete zvarne povezave v tlačnih sistemih. Ne spodbuja standardizacije povezav, ki bi se lahko štela kot obvezna ali ki bi kakor koli omejevala razvoj.  Po potrebi je treba upoštevati pravila napetostne analize. Ta standard vsebuje primere povezav, zvarjenih na naslednje načine: - z ročnim elektroobločnim varjenjem z oplaščeno elektrodo (111); - z obločnim varjenjem pod praškom (12); - z elektroobločnim varjenjem v zaščitnem plinu (13); - z obločnim varjenjem z netaljivo volframovo elektrodo pod zaščito obloka z inertnimi plini; TIG-varjenje (14); - s plazemskim obločnim varjenjem (15) (številke postopkov v skladu z EN ISO 4063) v jeklenih tlačnih sistemih. Drugi postopki po dogovoru. Ta standard zajema zvarne spoje na jeklu, vendar se lahko uporabi tudi za druge materiale. V takšnih primerih je treba preveriti obliko in mere zvara. Ocena ustreznosti zvarnih povezav pri posebnih delovnih pogojih, na primer koroziji in utrujenosti materiala, ni posebej obravnavana.

General Information

Status
Published
Publication Date
12-Jan-2010
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
27-Apr-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.QWHSchweißen - Verbindungselemente beim Schweißen von Stahl - Teil 1: Druckbeanspruchte BauteileSoudage - Descriptif de base des assemblages soudés en acier - Partie 1: Composants soumis à la pressionWelding - Basic welded joint details in steel - Part 1: Pressurized components25.160.40Varjeni spoji in variWelded jointsICS:Ta slovenski standard je istoveten z:EN 1708-1:2010SIST EN 1708-1:2010en,fr,de01-april-2010SIST EN 1708-1:2010SLOVENSKI
STANDARDSIST EN 1708-1:1999/A1:2004SIST EN 1708-1:19991DGRPHãþD



SIST EN 1708-1:2010



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1708-1
January 2010 ICS 25.160.40 Supersedes EN 1708-1:1999English Version
Welding - Basic welded joint details in steel -Part 1: Pressurized components
Soudage - Descriptif de base des assemblages soudés en acier - Partie 1: Composants soumis à la pression
Schweißen - Verbindungselemente beim Schweißen von Stahl - Teil 1: Druckbeanspruchte Bauteile This European Standard was approved by CEN on 28 November 2009.
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 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 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1708-1:2010: ESIST EN 1708-1:2010



EN 1708-1:2010 (E) 2 Contents Page Foreword .31 Scope .42 Normative references .43 Requirements .43.1 Selection of detail .43.2 Joint preparation (geometry and size).53.2.1 General .53.2.2 Joint preparation geometry .53.2.3 Weld sizes .53.3 Presentation .53.4 Removal of internal sharp edges in branch bores .53.5 Preparation of holes in shell for set-through branches.63.6 Welds for smooth transition .63.7 Oblique and tangential branches .6 Tables Table 1 — Butt joints of different thickness . 7Table 2 — Branches without compensation rings . 11Table 3 — Branches with compensation rings . 23Table 4 — Sockets and couplings . 25Table 5 — Flanges . 27Table 6 — Jacketed vessels . 31Table 7 — Tube to tube plate connection. 42Table 8 — Flate end or tube plate to shell connections . 46Table 9 — Internal diaphragms and separators . 53Table 10 — Supports and non-pressure parts . 54Table 11 — Special shell to head end connections . 61Table 12 — Weld ring seal . 62Table 13 — Pipe details . 64Table 14 — Block flanges . 70 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 3 Foreword This document (EN 1708-1:2010) has been prepared by Technical Committee CEN/TC 121 “Welding”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2010, and conflicting national standards shall be withdrawn at the latest by July 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1708-1:1999. EN 1708, Welding — Basic weld joint details in steel, consists of the following parts:  Part 1: Pressurized components  Part 2: Non internal pressurized components According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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 the United Kingdom.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 4 1 Scope The purpose of this European Standard is to exemplify commonly accepted welded connections in pressure systems. It does not promote the standardization of connections that may be regarded as mandatory or restrict development in any way. Stress analysis rules should be considered if necessary. This standard contains examples of connections welded by:
 Manual metal-arc welding with covered electrode (111);  Submerged arc welding (12);  Gas shielded metal arc welding (13);  Tungsten inert gas arc welding; TIG-welding (14);  Plasma arc welding (15) processes (process numbers according to EN ISO 4063) in steel pressure systems. Other processes by agreement. This standard covers welded joint details in steel, but can be applied to other metallic materials. In such cases the shape and dimensions of the weld should be checked. The estimation of the suitability of welded connections for special service conditions, for example corrosion and fatigue are not specially considered. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers (ISO 4063:2009) 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 9692-1:2003, Welding and allied processes — Recommendations for joint preparation — Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-1:2003) EN ISO 9692-2:1998, Welding and allied processes — Joint preparation — Part 2: Submerged arc welding of steels (ISO 9692-2:1998) 3 Requirements 3.1 Selection of detail Connections are not considered to be equally suitable for all service conditions, nor is the order in which they are shown indicative of their relative characteristics. In selecting the appropriate detail to use from the several SIST EN 1708-1:2010



EN 1708-1:2010 (E) 5 alternatives shown for each type of connection, consideration shall be given to existing fabrication and service conditions that pertain. 3.2 Joint preparation (geometry and size) 3.2.1 General The limitations quoted in weld profiles and sizes are based on commonly accepted practice, but they may be subjected to modifications if required by special welding techniques or design conditions, which should be included in the design documents and in the welding procedure specifications (WPS). 3.2.2 Joint preparation geometry Examples of recommended joint preparation geometry (e.g. bevel angles, root radius, presence of backing strips, root faces) are referred to EN ISO 9692-1 when applicable and to EN ISO 9692-2 relative to submerged arc welding process. Missing dimensions of preparations are in accordance with EN ISO 9692-1. In case where full penetration butt joints are indicated, it is intended that they shall be back chipped or gouged and back welded, or alternatively that the welding procedure shall be such as to ensure sound, effective root penetration. For relevant difference of thickness (generally a difference of about 3 mm (see Table 1, no. 1.1.1 to 1.1.6) could be considered relevant; in any case the thickness of material shall be taken into account, as well as the shape of the joint) of parts to be butt welded, the thickest element shall be shaped with a slope of 1:5 up to 1:2. Smoother transition of wall thickness is applicable in severe service conditions. 3.2.3 Weld sizes The thickness of welds (in particular of fillet welds), which are not determined by their profile, are based on the assumption that the connection need not be stronger than the connected parts. 3.3 Presentation
Figure 1 — Transversal section Figure 2 — Longitudinal section The drawings of the nozzle and branch connections (see Tables 2 and 3) show a transversal section of the connection (see Figure 1) and a longitudinal section of the connection (see Figure 2). 3.4 Removal of internal sharp edges in branch bores It will be noted that the internal edges on the bores of branches are shown partially radiused (for example see Table 2, no. 2.1.6) because a stress concentration occurs at this point. The rounding of the edges is recommended when the branch connection is subjected to severe service conditions like fatigue, creep and stress corrosion. SIST EN 1708-1:2010



EN 1708-1:2010 (E) 6 3.5 Preparation of holes in shell for set-through branches In case of set-in and set-through branches (according to Table 2, no. 2.2 and no. 2.3) holes in the shell may be cut and profiled in two ways as follows:  The depth of the grooves h1 and h2 may be constant around the hole as shown in Figure 3.
Key
h1, h2 depth of the grooves Figure 3 — Preparation of holes in the shell  The roots of the joint preparations may be in one plane, as for example when they are machine drilled, in which case the depths of the grooves will vary around the hole as shown in Figure 4.
Figure 4 — Preparation of holes in the shell 3.6 Welds for smooth transition In some cases it is convenient to foresee a fillet weld providing smooth geometric transition from the surface of one welded part to the surface of the other one, e.g. from branch to shell. Its purpose is to soften the notch effect in the branch-shell edge and therefore the throat thickness is not presented on the figure concerned. 3.7 Oblique and tangential branches The welded connections are contained in Tables 1 to 13. Regarding branches, the oblique and tangential ones are not specially considered as their preparation is similar to that reported on Tables 2 and 3 for radial branches. Only some significant cases are therefore considered (see Table 2, no. 2.2). NOTE 1 The welds are only blackened in the following tables when the figures do not give information about the dimension of the values for the preparation. NOTE 2 It is not intended that the values of the dimension given in the tables should be measured precisely but rather the general philosophy should be applied.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 7 Table 1 — Butt joints of different thickness no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 1.1 Butt joints in plates of different thickness 1.1.1
α ≤ 30° t1 < t2 In case of severe service conditions, the design shall be in accordance with Figures 1.1.2 and 1.1.3. e ≤ 0,1 t1 max. 2 mm (for one side welding) 1.5 and 2.3 1.1.2
α ≤ 30° t1 < t2
1.5, 2.3 and 2.5.2 1.1.3
α ≤ 30° t1 < t2 for ultrasonic test h > 3 t1, but min. 20 mm for radiographic test h ≥ t1 1.5, 2.3 and 2.5.2 1.1.4
α ≤ 30°
see 1.1.1 2.5.1
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 8 Table 1 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 1.1.5
α ≤ 30°
2.5.1 1.1.6
α ≤ 30°
for ultrasonic test h > 3 t1, but min. 20 mm for radiographic test h ≥ t1 2.5.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 9 Table 1 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 1.1.7
longitudinal weld: h1 ≤ 0,15 t1; maximum 3 mm h2 ≤ 0,3 t1; maximum 6 mm t2 - t1 ≤ 0,3 t1; maximum 6 mm
circumferential weld: h1 ≤ 0,2 t1; maximum 5 mm h2 ≤ 0,4 t1; maximum 10 mm t2 - t1 ≤ 0,4 t1; maximum 10 mm
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 10 Table 1 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 1.1.8
Fully penetrated or sealing run
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 11 Table 2 — Branches without compensation rings no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 These connections include the provision of compensation by thickening of the branch and/or shell. 2.1 Set-on branches (for special branch connections see 13.2) If the shell is stressed in direction of the thickness, it should be examined for laminations before setting on the branch.
2.1.1
t1 < 0,5 t2 45° ≤ α ≤
60°
1.9.1 or 1.11 one side welding 2.1.2
45° ≤ α1 ≤
60° 30° ≤ α2 ≤
45° These details are recommended only where the bore of the branch is readily accessible for welding. The joint should be back-gouged from the side most accessible and suitable for this purpose generally from the outside. 2.9.1, 2.9.2 or 2.11 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 12 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.1.3
α1 = 30° α2 = 45° See 2.1.2
2.1.4
no gap c ≥ 1,5 mm r ≥ 5 mm α = 30°  Joints generally used for small branch to shell diameter ratios.
 Diameter d to be bored out after welding to remove the weld root, in order to ensure sound weld. 1.9.1 or 1.11 one side welding SIST EN 1708-1:2010



EN 1708-1:2010 (E) 13 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.1.5
10 mm ≤ l ≤
15 mm h ≥ 3 mm 30° ≤ α ≤ 45° Joints generally used for small branch to shell diameter ratios. 1.11 one side welding 2.1.6
For branches up to approximately 100 mm bore. 1 mm ≤ b ≤ 3 mm
h ≤ 5 mm c = 1 mm r = 7 mm α1 ≤ 45° α2 ≤ 45 ° Generally used for the attachment of branches to thick-walled shells.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 14 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.1.7
h ≤ 3 mm The sizes of the fillet welds should be based on the loads transmitted, paying due attention to other fabrication and service requirements.
2.1.8
r = 3 mm E = 6 mm F = 1,5 mm α = 30° 1 = Profile to meet design requirements For tubes or nozzles up to approximately 100 mm bore and 6 mm wall thickness t.
2.1.9 A = 5 mm B = 5 mm C = 5 mm E = t F = 1,5 mm G = 0,5 mm α = 30° 1 = Profile to meet design requirements For tubes or nozzles up to and including 150 mm bore and wall thickness t over 6 mm and up to and including 13 mm.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 15 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.1.10 Dimensions in millimetres A = 30 mm B = 1,5 mm H ≥ 3 mm M ≥ 10 mm N = 5 mm W ≥ 2 mm r = 6 mm α = 30° 1 = Fin material 2 = Weld access hole (filled after welding tube to header) Tube panel connections only applicable to tubes up to 100 mm bore and 6 mm wall thickness t.
2.1.11
F = 2 mm G = 1,5/2,0 mm T = 16 mm max. 45° ≤ α ≤ 60°
For all tube and nozzle sizes.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 16 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.2 Set-in branches (for special branch connection see 13.2) As a general recommendation all set-in branches should be welded on the inside of the shell as shown e.g. in Figures 2.2.1 and 2.2.2 if they are accessible for the purpose, otherwise preference should be given to set-on branch connections as shown e.g. in Figure 2.1.1. 2.2.1
a = 0,5 t1 h = t1 r ≥ 8 mm b ≤ 1 mm 10° ≤ α ≤ 20° For partial penetration welded connection.
Generally used when t1 is less than t2/2. For smaller diameter branches attention is drawn to the details shown in Table 3 which may provide a preferable solution. 1.11 and 3.1.1 2.2.2
3 mm ≤ a = 0,5 t1 a1 < 0,7 t1 b ≤ 1 mm For partial penetration welded connection.
Limited application:
 Internal diameter of shell ≤ 200 mm;  wall thickness of branch t1 ≤ 5 mm. 3.1.1 and 3.1.2 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 17 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.2.3
a ≥ 5 mm a 1 ≤ 0,7 t1 b ≤ 1 mm 10° ≤ α ≤ 20° r ≥ 8 mm For partial penetration welded connection. 3.1.2 and 1.11 2.2.4
3 mm ≤ a = 0,5 t1
a1 ≤ 0,7 t1 b ≤ 1 mm For full penetration welded connection.
3.1.2 and 1.11 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 18 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.2.5
h1 = 0,6 t1 h2 = t1 b ≤ 1 mm r ≥ 8 mm For partial penetration welded connection. 2.11 2.2.6
t1 ≥ 3 mm t2 ≤ 3 t1 40° ≤ α ≤ 60°
For full penetration welded connection.
For joints which are accessible from one side only. 1.9.1 and 1.11 2.2.7
t2 ≤ 3 t1 30° ≤ α ≤ 45° 2 mm ≤ b ≤ 3 mm 2 mm ≤ c ≤ 4 mm For full penetration welded connection. 2.9.1, 2.9.2 and 2.11 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 19 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.2.8
45° ≤ α ≤ 60° 2 mm ≤ b ≤ 3 mm 2 mm ≤ c ≤ 4 mm
For full penetration welded connection.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 20 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.2.9
45° ≤ α ≤ 50°
To be welded from both sides.
2.2.10
3 mm ≤ a ≥ 0,5 t1 45° ≤ α ≤ 60° 2 mm ≤ b ≤ 4 mm
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 21 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.3 Set-through branch 2.3.1
a = 0,5 t1 b ≤ 1 mm Generally used when t1 is less than t2/2. 4.1 2.3.2 h = 0,6 t1 m ≥ t1 For partial penetration welded connection.
2.11 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 22 Table 2 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 2.3.3
m ≥ t1 For full penetration welded connection.
2.9.1 and 2.11 2.4 Extruded branch connections (for special branch connections see 13.2) 2.4.1
m ≥ t1 1 conventional butt joint Conventional butt joint will be used to weld the branch connection to the shell, and may not necessarily have the form shown.
Example of application: Surface coating, e.g. internal rubber lining. 1.5 2.5 Butt welded branches 2.5.1
1 conventional butt joint
2.5.1, 2.5.2 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 23 Table 3 — Branches with compensation rings no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 Compensation rings should be fitted to the shell and vent holes should be provided in them. The thickness of the compensation ring should preferably not exceed the thickness of the shell. 3.1 Set-on branches 3.1.1
5 mm ≤ a = 0,5 t3, b ≥ 7 mm α ≥ 15° 1 for shell to branch joints, see Table 2
1.9.1 or 1.11 and 1.10 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 24 Table 3 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 3.2 Set-in branches Gap between branch and shell. It is recommended that the gap between the branch and the shell, also the compensation ring, should not exceed 3 mm. Wider gaps increase the tendency to spontaneous cracking during welding, particularly as the thickness of the parts joined increases.
Internal compensation ring. Set-in branches with a single compensation ring has been shown with the ring on the outside of the shell, which is the normal case. Similar connections may be used for the attachment of internal compensation ring in the formed end of pressure vessel and in spherical vessel. 3.2.1
5 mm ≤ a = 0,5 t3 b ≥ 7 mm 30° ≤ α ≤ 45°
≥ 20°
Compensation of the branches with big wall thickness is preferred to compensation rings. For shell to branch joints, see Table 2 in Figure 2.2.7 2.9.1, 2.11 and 1.10 The reinforcements shall be checked by calculation. Reinforcements by nozzles with higher wall thickness shall be preferred to discoidal reinforcements. α = 60° a = 0,5 t3 h > 0,7 t3 t3 < t2
a = 0,7 t3 2 mm ≤ b1 ≤ 4 mm b2 ≥ 7 mm
≥ 20° z ≈ 0,3 t3 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 25 Table 4 — Sockets and couplings no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 4.1 Sockets and couplings 4.1.1
m = 1,5 mm Small couplings in 4.1.1 to 4.1.3 inclusive may be attached to shells by the connections and (with the exception of 4.1.3) by any other appropriate joint shown in Figures 2.3.1 to 2.5.1. Applications especially for attachments, e.g. temperature and pressure sensors. Not suitable when crevice corrosion is expected. 3.1.1 and 4.1.3 4.1.2
see 4.1.1 4.1.3 4.1.3
m = 1,5 mm see 4.1.1 Not suitable when crevice corrosion is expected. 3.1.2 and 1.9.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 26 Table 4 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 4.1.4
m = 1,5 mm Applications especially for attachments, e.g. temperature and pressure sensors. Not suitable when crevice corrosion is expected.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 27 Table 5 — Flanges no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998
Due to distortion it may be necessary to machine the flange-face after welding. The clearance between the bore of the flange and the inner diameter of the branch shall not exceed 2 mm. In the case of thick set-on flanges a radial vent hole through the flange may be useful. 5.1 Flanges (t is the tube thickness) 5.1.1
After machining flange to final thickness.
h1 ≥ 0,7 t h2 ≥ 0,7 t
Face and back welded flange.
For partial penetration welded connection.
1.11 and 2.11 5.1.2
1 conventional butt weld Welding neck flange.
Refer to Table 1 from 1.1.1 to 1.1.3 1.5 or 1.3 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 28 Table 5 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 5.1.3
Loose flange.
2.11 and 1.9.1 5.1.4
a1 = 0,7 t a2 = 0,7 t b ≤ 2 mm m ≥ 3 mm 4 mm ≤ t ≤ 10 mm
Fillet welded flange.
3.1.2 and 3.1.1 5.1.5
h1 ≥ 0,7 t h2 ≥ 0,7 t 45° ≤ α1 ≤ 60° α2 = 30°
Table 5 (continued) SIST EN 1708-1:2010



EN 1708-1:2010 (E) 29 no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 5.1.6
r = 7 mm h1 ≥ 0,7 t h2 ≥ 0,7 t 45° ≤ α1 ≤ 60° 10° ≤ α2 ≤ 20°
5.1.7
r = 7 mm 10° ≤ α ≤ 20° a ≥ 0,7 t h ≥ 0,7 t
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 30 Table 5 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 5.1.8
a ≥ 0,7 t 5 mm ≥ m = 0,5 t b ≥ 5 mm n ≥ 5 mm α = 15°
1.4 5.1.9
1 conventional butt weld For lower pressures and smaller pipe diameters or pipes in stainless steel with flange made of carbon steel. 1.3
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 31 Table 6 — Jacketed vessels no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 It is recommended that the gap between the shell of the vessel and the jacket or blocking ring should not exceed 3 mm. A blocking ring should be machined to a circumferential length not more than 5 mm greater than that of the vessel. Wider gaps increase the tendency to spontaneous cracking during welding, particularly as the thickness of the parts increase.
6.1 Attachment of jackets 6.1.1
1 jacket 2 shell 2 mm ≤ b ≤ 4 mm 45° ≤ α1 ≤ 60° 35° ≤ α2 ≤ 60°
 As service conditions become more severe, change to full penetration weld;
 in difficult situations, chamfering the blocking ring will help to avoid cracking;  if the shell plate is stressed in direction of its thickness, it shall be examined for laminations before welding the jacket.
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 32 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.1.2
a ≥ 0,7 t b ≤ 2 mm
see 6.1.1
4.1.3 and 1.5 6.1.3
t2 ≤ 15 mm 45° ≤ α ≤ 60° or as calculated 1 sealing run
SIST EN 1708-1:2010



EN 1708-1:2010 (E) 33 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.1.4
2 mm ≤ b ≤ 4 mm 45° ≤ α ≤ 60°
see 6.1.1 2.9.1 6.1.5
3 mm ≥ a ≥ 0,7 t α = 45°
1.9.1 6.1.6
α = 45°
2.9.1 and 1.9.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 34 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.2 Blocking rings 6.2.1
a = 0,5 t b ≤ 2 mm Alternative ring to shell weld detail permissible when t does not exceed 15 mm 4.1.3 6.2.2
1 see Figure 5.1.1 for weld size and profile
2.11 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 35 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.3 Intermediate connections between shell and jacket 6.3.1
d ≥ 2 m
2.8 and 1.9.1 6.3.2
3 mm ≥ a ≥ 0,7 t 45° ≤ α ≤ 60° b = 2 mm
4.1.3 and 1.9.1 6.3.3
1 circular ring with vent holes For use on pressure vessels, when there is no risk of corrosion. 3.1.2 and 3.1.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 36 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.3.4
45° ≤ α ≤ 60° Dimensions defined by construction. for b) and c) = For use on pressure vessels, when there is no risk of corrosion. 3.1.2 and 3.1.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 37 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.4 Branch connections 6.4.1
Inside shell accessible for welding. α = 45° Not applicable for alternating bend stress, e.g. effected by temperature difference between inner vessel and outer shell of the vessel. 1.9.1 6.4.2
May be welded from the outside only. α1 = 60° α2 = 45° It is necessary to ensure good access to the weld between inner shell and branch.
Not applicable for alternating bend stress, e.g. effected by temperature difference between inner vessel and outer shell of the vessel. 1.9.1 and 1.3 6.4.3
1 gap 2 mm to 3 mm 2 good access to the weld between the inner shell and branch is required.
h ≥ m α = 45° These details are for use only when it is necessary for the jacket to extend up the branch. 1.9.1 SIST EN 1708-1:2010



EN 1708-1:2010 (E) 38 Table 6 (continued) no. Figure Application/ condition Note Reference to EN ISO 9692-1:2003 and EN ISO 9692-2:1998 6.4.4
If the b
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