SIST EN 14208:2004
(Main)Transportable gas cylinders - Specification for welded pressure drums up to 1000 litre capacity for the transport of gases - Design and construction
Transportable gas cylinders - Specification for welded pressure drums up to 1000 litre capacity for the transport of gases - Design and construction
This European Standard specifies the minimum requirements for the material, design, construction and workmanship, inspection and testing at manufacture of refillable welded steel pressure drums, hereafter referred to as drums, of volumes of 150 litres up to 1 000 litres for compressed and liquefied gases. Cylindrical and spherical containers are covered.
Ortsbewegliche Gasflaschen - Spezifikation für geschweißte Druckfässer mit einem Fassungsraum bis zu 1000 liter für den Transport von Gasen - Gestaltung und Konstruktion
Diese Europäische Norm legt die Mindestanforderungen an die Werkstoffe, konstruktive Gestaltung, Bauweise und Ausführung, Abnahme und Prüfung fest, die bei der Herstellung von wiederbefüllbaren, geschweißten Druckfässern aus Stahl für verdichtete und verflüssigte Gase mit Fassungsraum von 150 Liter bis einschließlich 1 000 Liter gelten. Behandelt werden zylindrische und kugelförmige Druckbehälter.
Bouteilles a gaz transportables - Spécification pour les futs soudés de capacité inférieure ou égale a 1000 litres destinés au transport des gaz - Conception et fabrication
Cette Norme européenne spécifie les exigences minimales pour les matériaux, la conception, la fabrication et la mise en ?uvre, l'inspection et les essais en cours de fabrication pour les futs a pression soudés en acier rechargeables, ci-apres dénommés futs, de capacité allant de 150 litres a 1 000 litres pour le transport des gaz comprimés et liquéfiés. Les réservoirs cylindriques et sphériques sont également couverts.
Premične plinske jeklenke - Specifikacija za varjene tlačne sode z zmogljivostjo do 1000 litrov za prevoz plinov - Oblikovanje in izdelava
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsbewegliche Gasflaschen - Spezifikation für geschweißte Druckfässer mit einem Fassungsraum bis zu 1000 liter für den Transport von Gasen - Gestaltung und KonstruktionBouteilles a gaz transportables - Spécification pour les futs soudés de capacité inférieure ou égale a 1000 litres destinés au transport des gaz - Conception et fabricationTransportable gas cylinders - Specification for welded pressure drums up to 1000 litre capacity for the transport of gases - Design and construction23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 14208:2004SIST EN 14208:2004en01-september-2004SIST EN 14208:2004SLOVENSKI
STANDARD
SIST EN 14208:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14208February 2004ICS 23.020.30English versionTransportable gas cylinders - Specification for welded pressuredrums up to 1000 litre capacity for the transport of gases -Design and constructionBouteilles à gaz transportables - Spécification pour les fûtssoudés de capacité inférieure ou égale à 1000 litresdestinés au transport des gaz - Conception et fabricationOrtsbewegliche Gasflaschen - Spezifikation fürgeschweißte Druckfässer mit einem Fassungsraum bis zu1000 liter für den Transport von Gasen - Gestaltung undKonstruktionThis European Standard was approved by CEN on 4 December 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14208:2004 ESIST EN 14208:2004
EN 14208:2004 (E)2ContentsPageIntroduction.41Scope.52Normative references.53Terms, definitions and symbols.64Materials.85Design.96Lifting attachments.167Manufacturing process - Welding procedures.168Fabrication.189Welded joints.1810Surface finish of material.1811Assembly.1812Repair of weld defects.1913Construction and workmanship.1914Testing and examination.2015New design tests.2516Information to be marked.2617Records.27Annex A (normative) Description, evaluation of manufacturing defects and conditions for rejection ofwelded steel pressure drums at time of visual inspection.28Annex B (informative)
Examples of design test and batch test certificates.31Annex C (informative)
Guidance on the application of conformity assessment modules when usingthis standard.37Bibliography.42SIST EN 14208:2004
EN 14208:2004 (E)3ForewordThis document (EN 14208:2004) has been prepared by Technical Committee CEN/TC 23 “Transportable gascylinders”, the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by August 2004, and conflicting national standards shall be withdrawn at the latest byAugust 2004.This European Standard has been submitted for reference into the RID and/or in the technical annexes of the ADR.Therefore in this context the standards listed in the normative references and covering basic requirements of theRID/ADR not addressed within the present standard are normative only when the standards themselves arereferred to in the RID and/or in the technical annexes of the ADR.Annex A is normative and annexes B and C are informative.This document includes a bibliography.For relationships with EC directives, RID and ADR see informative annex C, which is an integral part of thisdocument.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.SIST EN 14208:2004
EN 14208:2004 (E)4IntroductionThe purpose of this European Standard is to provide a specification for the design, manufacture, inspection andapproval of welded steel pressure drums.The specifications given are based on knowledge of and experience with, materials, design requirements,manufacturing processes and control during manufacture of steel drums in common use in the countries of theCEN members.SIST EN 14208:2004
EN 14208:2004 (E)51 ScopeThis European Standard specifies the minimum requirements for the material, design, construction andworkmanship, inspection and testing at manufacture of refillable welded steel pressure drums, hereafter referred toas drums, of volumes of 150 litres up to 1 000 litres for compressed and liquefied gases. Cylindrical and sphericalcontainers are covered.2 Normative referencesThis Standard incorporates by dated or undated reference, provisions from other publications. These normativereferences are cited at the appropriate place in the text and publications are listed hereafter. For dated references,subsequent amendments to or revisions of any of these publications apply to this European Standard only whenincorporated in it by amendment or revision. For undated references the latest edition of the publication referred toapplies (including amendments).EN 287-1, Approval testing of welders — Fusion welding — Part 1: SteelsEN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules (ISO15607:2003)EN 288-3, Specification and approval of welding procedures for metallic materials — Part 3: Welding proceduretests for the arc welding of steelsEN 462-3, Non-destructive testing — Image quality of radiographs — Part 3: Image quality classes for ferrousmetalsEN 629-1, Transportable gas cylinders — 25 E taper thread for connection of valves to gas cylinders — Part 1:SpecificationEN 895, Destructive tests on welds in metallic materials — Transverse tensile testEN 910, Destructive tests on welds in metallic materials — Bend testsEN 970, Non-destructive examination of fusion welds — Visual examinationEN 1435, Non-destructive examination of welds — Radiographic examination of welded jointsEN 1714, Non destructive examination of welds — Ultrasonic examination of welded jointsEN 10002-4, Metallic materials — Tensile test — Part 4: Verification of extensometers used in uniaxial testingEN 10028-1, Flat products made of steels for pressure purposes — Part 1: General requirementsEN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specifiedelevated temperature propertiesEN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalizedEN 10028-4, Flat products made of steels for pressure purposes — Part 4: Nickel alloy steels with specified lowtemperature propertiesEN 10028-5, Flat products made of steels for pressure purposes — Part 5: Weldable fine grain steels,thermomechanically rolledEN 10028-7, Flat products made of steels for pressure purposes — Part 7: Stainless steelsSIST EN 14208:2004
EN 14208:2004 (E)6EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test methodEN 10088-1, Stainless steels — Part 1: List of stainless steelsEN 10088-2, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip for general purposesEN 10088-3, Stainless steels — Part 3: Technical delivery conditions for semi-finished products, bars, rods andsections for general purposesEN 12517, Non-destructive examination of welds - Radiographic examination of welded joints - Acceptance levelsEN 13445-2, Unfired pressure vessels — Part 2: MaterialsEN 22063, Metallic and other inorganic coatings — Thermal spraying — Zinc, aluminium and their alloys(ISO 2063:1991, modified)EN ISO 5817:2003, Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam weldingexcluded) - Quality levels for imperfections (ISO 5817:2003EN ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visualassessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and ofsteel substrates after overall removal of previous coatings (ISO 8501-1:1988)EN ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials (ISO 11114-1: 1997)EN ISO 11114-2, Transportable gas cylinders –Compatibility of cylinder and valve materials with gas contents – Part2: Non-metallic materials (ISO 11114-2:2000)EN ISO 11116-1, Gas cylinders — 17E taper thread for connection of valves to gas cylinders — Part 1: Specifications(ISO 11116-1:1999)3 Terms, definitions and symbolsFor the purposes of this standard, the following terms, definitions and symbols apply:3.1 Terms and definitions3.1.1yield stressvalue corresponding to the lower yield stress or, for steels that do not exhibit a defined yield point, the 0,2 % proofstress (1% proof stress for austenitic stainless steel)3.1.2normalizingheat treatment given to the steel by heating to a uniform temperature above the upper critical point (AC3) of thesteel and then cooled in a controlled atmosphere3.1.3stress relievingheat treatment given to reduce the residual stresses of the steel3.1.4batchquantity of finished drums made consecutively during the same or consecutive working days to the same design,size and material specifications; using the same welding procedures; and heat-treated under the same conditionsof temperature and durationSIST EN 14208:2004
EN 14208:2004 (E)73.1.5test pressurepressure applied to the drum after completion of all fabrication; it is the parameter used to design the drum3.1.6finished drumdrum which is fully assembled and appropriately stampmarked, but without any external coatings3.2 Symbolsa1Minimum thickness of the cylindrical part of the drum based on pressure criteria, in mma2Minimum thickness of cylindrical shell or dished end based on handling criterion, in mmBArea to be compensated, in mm2b1Calculated minimum thickness of dished ends, in mmc1Calculated minimum thickness of a spherical shell or hemispherical dished ends, in mmDdDiameter of valve protection dome, in mmDoMaximum outside diameter of the drum, in mmDiInternal diameterfcMaximum allowable stress for the cylindrical section of the drum, in MPafeMaximum allowable stress for the dished ends of the drum, in MPafpMaximum allowable stress for the pad material of the drum, in MPafsMaximum allowable stress for the spherical section of the drum, in MPaHHeight of the dished endH0External height of the domed part of the end, in mmHeEquivalent height of a dished end for determining the shape factor, in mmkMinimum length of the edge on the shroud or of the drum, in the case of dished ends convex to pressure, toensure compatibility with hooks (see Figure 5)KShape factor of the dished endsLThe dimension between the external surface of the shroud or of the drum, in the case of dished ends convex topressure, and the internal surface of the edge (see Figure 5)NLargest dimensioning of an opening, in mmPMaximum dimension of pads that can be considered as compensation, in mmphTest pressure, in bar 1) above atmospheric pressureQRadius of equivalent sphere when calculating compensation, in mm
1)1 bar = 105 Pa = 0,1 MPa = 0,1 N/mm2SIST EN 14208:2004
EN 14208:2004 (E)8R0External radius of the crown of a torispherical dished end, in mmr0External radius of the knuckle of a torispherical dished end, in mmRmActual value of tensile strength, in MPaSThickness of shell in area to be compensated, in mmSfLength of straight flange on a torispherical or ellipsoidal dished end, in mms1Minimum thickness of spherical section, in mmSfLength of a straight flange on a torispherical or ellipsoidal dished end, in mmTMinimum value of tensile strength, in MPateThickness of un-pierced end in location of opening, in mmYMinimum guaranteed value of yield stress of the material in the relevant part of the finished drum, in MPa4 Materials4.1 General provisions4.1.1Materials for the pressure envelope shall conform to EN 10028-1 to –5 for carbon steels and for austeniticstainless steels either EN 10028-7 or EN 10088-1 to –3.4.1.2The materials used for the drum shall be compatible with the intended gas service e.g. corrosive orembrittling gases. See EN ISO 11114-1 and EN ISO 11114-2.NOTEParticular attention should be paid to the specification for bolts, studs and other components, which are in contactwith the gas where the use of high strength materials may be incompatible with embrittling gases.4.1.3All parts welded to the drum shall be made of material that is compatible with respect to weldability andstrength.4.1.4The welding consumables shall be such that they are capable of giving consistent welds with minimumtensile strength at least equal to that specified for the parent material in the finished drum.4.1.5The manufacturer shall obtain and provide certificates proving conformance to the material specificationsfor the steel used for the construction of pressure retaining parts of the drum. If the minimum values of the yieldstress of the material guaranteed by the steel manufacturer is greater than the minimum specified in the materialstandard, then this higher figure may be used in the design calculations, up to a maximum enhancement of 15 %. Itshall be ensured that the heat treatment (if any) will not affect this minimum guaranteed value.The manufacturer shall be able to identify all pressure bearing parts of the drum with the cast(s) of steel from whichit is made.4.2 Heat treatmentIf the steel used, or the steel specification requires it, the drums shall be heat treated or stress relieved. Themanufacturer shall produce certificates for the applied heat treatment. The temperature and process time shall becontinuously recorded during the heat treatment. Localized heat treatment is not permitted.SIST EN 14208:2004
EN 14208:2004 (E)95 Design5.1 Design stressThe design stress fc, fe, fp and fs at the test pressure shall not exceed 0,77 Y.5.2 Calculation of thickness5.2.1 Cylindrical wallThe minimum thickness a1 of a wall of cylindrical section shall be not less than the thickness calculated using theequation: a1=PhfcDoPh+´20 (1)5.2.2 Spherical shellThe minimum thickness s1 of a wall of spherical section shall be not less than the thickness calculated using theequation: 1s=PhfsDoPh+´40 (2)5.2.3 Dished ends concave to pressure5.2.3.1 GeneralFor a drum with ends concave to pressure, the minimum thickness b1 of the wall of a torispherical sphere orellipsoidal dished end shall be not less than b1=K.a1 where the value of K varies with the shape of the ends, asshown in Figure 1. The value of K shall not be taken as less than 1,0. If a drum is made of two dished ends, thethickness of the straight cylindrical part shall be not less than a1 as calculated according to 5.2.1. If a drum is madeof two hemispherical ends, their thickness shall be calculated according to 5.2.2.5.2.3.2 Shape factorThe shape factor K is determined and taken from Figure 1, using the appropriate values of He/D0 and b1/Do. Thevalue for He is determined as follows:—for an ellipsoidal end He = H0,—for a torispherical end He = the least of : H0,
or D02 / 4R0, or (D0r0/2)0,5.NOTEThe external height of the domed end for a torispherical end may be calculated as H0 = R0 – {(R0-D0/2)(R0+D0/2 –2 r0)}0,5SIST EN 14208:2004
EN 14208:2004 (E)10Figure 1 — Shape factor KSIST EN 14208:2004
EN 14208:2004 (E)11Figure 2 — Weld detail for dished-in ends5.2.3.3 Limitations of shapea) In a torispherical end R0 shall not be greater than D0;b) In a torispherical end r0 shall not be less than 0,1 D0 nor less than four times the thickness of the dishedend as manufactured;c) In an ellipsoidal end the ratio He/DO shall be not less than 0,192;d) Sf shall be not less than 0,3 (Dote)0.55.2.4 Dished ends convex to pressureIn the case of dished ends convex to pressure, the design shall be confirmed by a burst test and a pressure cyclingtest (see clause 15). The arrangement of the end weld shall be such that it can be inspected by radiography or anequivalent NDT method. Figure 2 gives one example.Dished ends convex to pressure shall not be used for vessels designed to contained corrosive substances.SIST EN 14208:2004
EN 14208:2004 (E)125.3 Minimum thickness for handling5.3.1The thicknesses of the shell and ends calculated from the pressure conditions (see 5.2) shall be increasedif they are less than the value calculated from the formula a2 = 2,5 (Do/T)0,5, with a minimum thickness of 2,5 mm. Ifthe materials used for shell and ends are different, the calculation shall be carried out for each component usingthe appropriate properties.5.3.2When the thickness of a drum has to be increased in accordance with 5.3.1, the test pressure mayoptionally be increased to take account of this increased thickness, provided the other parts of the drum conform tothe design requirements of the higher test pressure.5.4 Fittings5.4.1 GeneralFittings (valves for filling, emptying, pressure relief, level devices etc.) shall be attached as defined below. Whilethere is no restriction on the number of apertures, their number shall be kept to the minimum.NOTEIt is recommended that no more than two apertures per end should be used.Fittings shall be located only in the dished ends or spherical sections. They shall be attached to parts of thecontainer that are reinforced locally by a pad, or to a flange or access plate bolted to a flange, except when thethickness of the shell is greater than 15 mm. Openings shall be compensated (see 5.4.6).5.4.2 Screwed fittings5.4.2.1Screwed fittings up to 80 mm thread diameter may be used. If a tapered thread is used, with sealing ofthe pressure on the threads, then a sealant, such as PTFE tape, PTFE spray, a lead ferrule or an aluminiumferrule, shall be inserted between the threaded components to effect a seal. If parallel threads are used, thetorques used for assembly shall be set both to ensure a seal on the gasket, and to prevent loosening in transit.5.4.2.2For standard valves with taper and parallel threads, EN 629-1 and EN ISO 11116-1 respectively definethe dimensions and mode of connection.NOTEEN 629-2 and EN ISO 11116-2 respectively define the methods of controlling the thread gauges.5.4.3 Bolted connectionsBolted connections shall be made with at least three bolts or studs. Studs shall be threaded to their ends, so thatthey lock upon insertion. Joining surfaces shall be flat and true, in accordance with the flatness, parallelism andperpendicularity tolerances specified on the design drawings (e.g. to EN ISO 1392), and if necessary shall bemachined after heat treatment if they have become distorted.5.4.4 Protection of fittings5.4.4.1 GeneralDrums shall be such that all fittings are situated inside the contour of the end shrouds or support structure, or theend of the drum in the case of those with dished ends convex to pressure.5.4.4.2 End shroudsEnd shrouds shall have minimum thickness of 10 mm, or 7 mm if fitted with a reinforcing ring. They shall beattached to the drum by welding for at least 50 % of their circumference. Shrouds shall have holes or cutaways, toallow for drainage.SIST EN 14208:2004
EN 14208:2004 (E)135.4.4.3 Frame protectionDrums designed to be carried vertically may alternatively have a frame structure rather than shrouds. Bottomoutlets and their external pipework shall be protected from impact by a steel structural member of second momentof area not less than 3,5 ´ 106 mm4.5.4.5 Local protection5.4.5.1In addition to the general protection specified in 5.4.4, fittings shall be provided with local protection.5.4.5.2Where the gas is toxic, the valves shall be covered by metal domes or individual caps, of thickness notless than (Dd/15)0,5 where Dd is the diameter of the dome in mm, but in any case not less than 2,5 mm. A domeshall be capable of being hinged or moved to allow access for filling or emptying, and secured for transport.
Thereshall also be a facility within the dome to allow venting of any gas within, in case of leakage.5.4.5.3Where the gas carried is not toxic, the local protection may take the form of a fixed steel cage mountedlocal to the fittings. The cage shall allow access to the valves and fittings. In the case of a container that isdesigned to remain vertical, additional protection is not required where the clearance between the fittings and theedge of the shroud or frame is at least 100 mm.5.4.5.4Blank plugs, fusible plugs and pressure relief valves do not require additional local protection providedthat they are mounted at a diameter at least 75 % of that of the shroud, and are of low profile protruding not morethan 30 mm from the surface of the drum.5.4.6 Compensation of openings5.4.6.1Openings shall have their largest dimension N less than 0,5 Do. (See Figure 3).5.4.6.2The total cross-sectional area to be compensated, B, required in any given plane shall not be less thanB = N x S where S is the thickness of an un-pierced dished end or spherical section calculated from the formulae in5.2.2 or 5.2.3.The area of compensation in the parts available for replacement shall be not less than B (see Figure 3). Incalculating this area, only material up to a distance P from the actual surface of the shell may be considered, whereP = (N.te)0,5 .Where the pad is made from a material strength different from the part to be compensated, the area available to beconsidered as compensation shall be multiplied by the ratio of the allowable stresses (fp/fs or fp/fe) as appropriate.5.4.6.3S shall not be less than b1 or s1, except that:a) when the opening and its compensation are located entirely within the spherical portion of a torisphericaldished end, then S shall not be less than the thickness required for a sphere equal to the spherical portion of adished end.b) when the opening and its compensation are located in an ellipsoidal end and are entirely within a circle havingthe radius measured from the centre of 0,40Do, S is the thickness required for a sphere having the equivalentradius Q taken from Table 1. Intermediate values may be taken from Figure 4.SIST EN 14208:2004
EN 14208:2004 (E)14Area of compensationBFigure 3 — Compensation of openingsTable 1 — Radius, Q, of equivalent sphereH/Di0,170,180,190,210,230,250,280,310,360,40,450,5Q/Di1,361,271,181,080,990,90,810,730,650,590,540,5SIST EN 14208:2004
EN 14208:2004 (E)15Figure 4 — Radius, Q, of equivalent sphereSIST EN 14208:2004
EN 14208:2004 (E)166 Lifting attachments6.1 Vertical and spherical drums6.1.1Drums designed to be carried in the vertical plane shall have structural members of minimum thickness5 mm of steel to take the forks of a fork-lift inserted into the bottom structure. The configuration of thesepockets/structure shall protect the drum from being impacted during normal handling.
The fork apertures shall bepositioned symmetrically about the centre of gravity and their size shall be appropriate to the forks which are to beused to move the drum. The fork apertures shall be designed such that the drum cannot accidentally disengagefrom the forks.6.1.2If lifting lugs are fitted, they shall be designed to withstand a design load of 2 x maximum gross weight.Drums with more than one lifting eye shall be designed such that a minimum sling leg angle of 45° to the horizontalcan be achieved during lifting using the lifting eyes.Where four lifting eyes are used their design shall be such that they are strong enough to allow the drum to be liftedby only two.
Where two or four lifting eyes are used, diametrically opposite lifting eyes shall be aligned with eachother to allow for correct lifting using shackle pins.6.2 Horizontal drumsWhen drums are designed to be carried in the horizontal position, the edge of the shrouds shall be reinforced. Theprofile of the edge of the shroud, or the edge of the drum in the case of dished ends convex to pressure, shallconform to the dimensions given in Figure 5. Dimension k is to be not less than 50 mm, and the angle f not greaterthan 45 °.NOTEThis is to ensure compatibility with the shape of the hooks used.Requirements for lifting lugs shall be as specified in 6.1.2.6.3 Attachment of rolling bandsFor carbon steel vessels to be used in the horizontal position, external rolling bands are not required if the externalsurface is shot blasted and covered with a zinc or aluminium spray before painting in accordance with EN 22063.In the case where rolling bands are fitted to the pressure containing part of the shell, they shall be attached bycontinuous fillet welds on either side of the band.If fitted to a non-pressure part (e.g. a shroud) then intermittent welds of not less than 50 % of the circumference arepermissible. The leg length of these fillet welds shall be not less than 5 mm.7 Manufacturing process - Welding proceduresThe manufacturer shall qualify the specific welding procedures and welders to EN 288 and EN 287 respectively.Records of such qualification shall be kept on file by the manufacturer for a period of at least 10 years.Procedural qualification tests shall be performed in such a manner that the welds shall be representative of thosemade in production.Re-qualifying of the procedure, as well as the welder, shall be required if there is a change in any of the essentialvariables as detailed in EN 287-1, EN ISO 15607 and EN 288-3.SIST EN 14208:2004
EN 14208:2004 (E)17a) L < 20 mmb) L > 20 mmFigure 5 — Limits on vessel or shroud edge dimensionsSIST EN 14208:2004
EN 14208:2004 (E)188 Fabrication8.1 Shell sectionsThe cylindrical shell shall be made from a single plate.8.2 Dished endsThe dished ends shall each be pressed from a single plate. All forming shall be done by machine; local heating orhammering is not permissible.8.3 Cold pressed dished endsWhere material properties require, cold-formed dished ends shall be normalized after pressing.
Ends distorted inthis heat treatment beyond the allowable limits shall be re-aligned by cold deformation in the press.8.4 Hot pressed dished endsDished ends pressed with plates heated to above 500 °C, do not require heat treatment after forming9 Welded jointsThe welding of the longitudinal and circumferential seams shall b
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