SIST EN 10300:2006
(Main)Steel tubes and fittings for onshore and offshore pipelines - Bituminous hot applied materials for external coating
Steel tubes and fittings for onshore and offshore pipelines - Bituminous hot applied materials for external coating
This European Standard specifies requirements for the application of factory applied external bitumen based hot applied coatings for the corrosion protection of steel tubes and fittings for onshore and offshore pipelines.
This specification covers the use of bitumen based enamel when the design temperature of the pipeline is within the following limits:
- oxidized bitumen - 15 °C to + 75 °C;
- modified bitumen - 30 °C to + 90 °C.
The coatings described in this European Standard can be applied to longitudinally or spirally welded tubes or to seamless tubes and fittings used for the construction of pipelines for the conveyance of liquids or gases.
NOTE Tubes coated with bitumen based enamel may be further protected by means of cathodic protection.
Stahlrohre und -formstücke für erd- und wasserverlegte Rohrleitungen - Werksumhüllungen aus heiß aufgebrachtem Bitumen
Tubes en acier et raccords pour canalisations enterrées et immergées - Revetements externes au moyen de matériaux hydrocarbonés
Le présent document spécifie les prescriptions relatives a l'application en usine des revetements externes a base de bitume appliqués a chaud, destinés a protéger contre la corrosion les tubes et raccords en acier pour canalisations enterrées et immergées.
La présente spécification couvre l'utilisation des émaux a base de bitume lorsque la température prévue de la canalisation se situe dans les limites suivantes :
- bitume oxydé : - 15 °C a + 75 °C ;
- bitume modifié : - 30 °C a + 90 °C.
Les revetements décrits dans le présent document peuvent etre appliqués sur les tubes soudés longitudinalement ou hélicoidalement ou sur les tubes sans soudure et sur les raccords utilisés dans la construction de canalisations de transport de liquides ou de gaz.
NOTE Les tubes revetus d'un émail a base de bitume peuvent en outre recevoir une protection complémentaire par protection cathodique.
Jeklene cevi in fitingi za obalne in priobalne cevovode – Bitumenski materiali za zunanje prevleke
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Jeklene cevi in fitingi za obalne in priobalne cevovode – Bitumenski materiali za zunanje prevlekeStahlrohre und -formstücke für erd- und wasserverlegte Rohrleitungen - Werksumhüllungen aus heiß aufgebrachtem BitumenTubes en acier et raccords pour canalisations enterrées et immergées - Revetements externes au moyen de matériaux hydrocarbonésSteel tubes and fittings for onshore and offshore pipelines - Bituminous hot applied materials for external coating77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific use25.220.60Organske prevlekeOrganic coatingsICS:Ta slovenski standard je istoveten z:EN 10300:2005SIST EN 10300:2006en01-januar-2006SIST EN 10300:2006SLOVENSKI
STANDARD
SIST EN 10300:2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10300November 2005ICS 23.040.99; 25.220.60; 75.180.10 English VersionSteel tubes and fittings for onshore and offshore pipelines -Bituminous hot applied materials for external coatingTubes en acier et raccords pour canalisations enterrées etimmergées - Revêtements externes au moyen dematériaux hydrocarbonésStahlrohre und -formstücke für erd- und wasserverlegteRohrleitungen - Werksumhüllungen aus heißaufgebrachtem BitumenThis European Standard was approved by CEN on 25 March 2005.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 Central Secretariat 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 Central Secretariat 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© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10300:2005: ESIST EN 10300:2006
EN 10300:2005 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Composition of the coating.6 5 Method of application.11 6 Inspection and testing.14 7 Repairs.15 8 Marking.15 9 Handling, transport and storage.16 Annex A (normative)
Preparation of steel surfaces for the tests given in Annexes D, E, F and G.17 Annex B (normative)
Priming of steel surfaces for the tests given in Annexes D, E, F and G.18 Annex C (normative)
Application of coating material for the tests given in Annexes D, E, F and G.19 Annex D (normative)
Sag test.20 Annex E (normative)
Impact test.21 Annex F (normative)
Peel test.23 Annex G (normative)
Bend test.26 Annex H (normative)
Determination of volatile matter — Percent loss of mass.27 Annex I (normative)
Cathodic disbonding test.28 Annex J (informative)
Guidelines for the use of coating materials.32 Annex K (normative)
Determination of filler content by ignition.35 Annex L (normative)
Determination of density at 25 °C.36 Annex M (normative)
Determination of mass per area and loss of mass on ignition.38 Annex N (normative)
Glass fabric — Tensile strength.40 Annex O (normative)
Determination of porosity.42 Annex P (normative)
Use of hot applied bitumen tapes for coating steel components.43 Annex Q (informative)
Recommended minimum quality control requirements for bituminous enamel pipeline coatings.45 Annex R (normative)
Holiday detection test.46 Annex S (normative)
Field bond test.47 Annex T (normative)
Inspection of coating thickness.49 Annex U (informative)
Information to be supplied at the time of ordering.50 Bibliography.51
SIST EN 10300:2006
EN 10300:2005 (E) 3 Foreword This document (EN 10300:2005) has been prepared by Technical Committee ECISS/TC 29 “Steel tubes and fittings for steel tubes”, the secretariat of which is held by UNI. 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 May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries 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 10300:2006
EN 10300:2005 (E) 4 1 Scope This European Standard specifies requirements for the application of factory applied external bitumen based hot applied coatings for the corrosion protection of steel tubes and fittings for onshore and offshore pipelines. This specification covers the use of bitumen based enamel when the design temperature of the pipeline is within the following limits: oxidized bitumen − 15 °C to + 75 °C; modified bitumen − 30 °C to + 90 °C. The coatings described in this European Standard can be applied to longitudinally or spirally welded tubes or to seamless tubes and fittings used for the construction of pipelines for the conveyance of liquids or gases. NOTE Tubes coated with bitumen based enamel may be further protected by means of cathodic protection. 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 1426, Bitumen and bituminous binders - Determination of needle penetration EN 1427, Bitumen and bituminous binders - Determination of softening point - Ring and ball method EN 1849-1, Flexible sheets for waterproofing - Determination of thickness and mass per unit area - Part 1: Bitumen sheets for roof waterproofing EN 12311-1, Flexible sheets for waterproofing - Part 1: Bitumen sheets for roof waterproofing - Determination of tensile properties EN ISO 2431, Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:1993, including Technical Corrigendum 1:1994) EN ISO 2592, Determination of flash and fire points - Cleveland open cup method (ISO 2592:2000) EN ISO 8501-1, Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings (ISO 8501-1:1988) EN ISO 13736, Petroleum products and other liquids - Determination of flash point - Abel closed cup method (ISO 13736:1997) ISO 719, Glass - Hydrolytic resistance of glass grains at 98 °C - Method of test and classification ISO 2591-1:1988, Test sieving - Part 1: Methods using test sieves of woven wire cloth and perforated metal plate ASTM D737-96, Test Method for Air Permeability of Textile Fabrics SIST EN 10300:2006
EN 10300:2005 (E) 5 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 coater company responsible for applying the coating material to the components to be coated in accordance with the provisions of this document or the special requirements given in the tender specification and in the order 3.2 bitumen viscous liquid or a solid, consisting of hydrocarbons and their derivatives, which is soluble in carbon disulfide or trichloroethylene NOTE It is substantially non-volatile and softens gradually when heated. It is black or brown in colour and possesses waterproofing and adhesive properties. It is obtained by refinery processes from petroleum. 3.3 oxidized bitumen bitumen which has been rheologically changed by the action of blowing air through the bitumen 3.4 modified bitumen bitumen which has been rheologically changed by the addition of polymers 3.5 bitumen based enamel coating material which is substantially comprised of either oxidized bitumen and filler or modified bitumen and filler 3.6 bitumen based tapes pre-fabricated tape coating material which is substantially comprised of bitumen based enamel with a carrier 3.7 hot applied material material which is solid at ambient temperature and becomes fluid on heating to application temperature 3.8 primer material applied as a thin film to metal in order to ensure adhesion of the subsequent protective coating 3.9 non-woven glass fabric continuous sheet of randomly arranged glass fibres in an open porous structure bonded by a suitable resin and reinforced by continuous longitudinal glass yarns 3.10 woven glass fabric regular woven glass fabric made from glass yarns held together by a binder 3.11 composite glass fabric one layer of glass fibre tissue and one layer of woven or lock welded glass mesh held together by a binder 3.12 composite polyester/glass fabric woven polyester glass mesh with a layer of glass fibre tissue held together by a binder SIST EN 10300:2006
EN 10300:2005 (E) 6 3.13 inner-wrap porous reinforcement of glass fibre which is buried within the bitumen based enamel coating in order to improve its mechanical performance 3.14 outer-wrap continuous sheet of reinforced glass fibre fabric or glass fibre/polyester composite fabric impregnated by a suitable bitumen based material which is compatible with the bitumen based coating and fused into the outer surface to improve its mechanical performance 4 Composition of the coating 4.1 Description of coating A coating generally shall comprise a number of layers or components as follows: primer which shall be compatible with the chosen enamel coating; enamel comprising a bitumen based material containing a filler; reinforcing glass fabric inner-wraps as required by the category and thickness of the coating enamel; glass or composite fabric outer-wraps as required by the category of coating enamel; solar protection, i.e. weather resistant material to protect the coating from sunlight. NOTE In special cases (for example, for onshore use, due to the nature of backfill material, or for offshore use) additional mechanical protection or a concrete weight coating may be applied by agreement. The type and grade of outer-wrap may be influenced by the presence or absence of the additional mechanical protection. 4.2 Constituent materials 4.2.1 General All constituent materials shall be supplied with the following identification: - name of manufacturer; - date of manufacture; - batch number/letter(s); - reference to this European Standard; - type and grade of material; - expiry date (where applicable). 4.2.2 Primers 4.2.2.1 General Any primer without the required identification shall be rejected and replaced with approved material. The primer shall be supplied in suitable airtight containers. The primer shall be compatible with the chosen bitumen based enamel coating. SIST EN 10300:2006
EN 10300:2005 (E) 7 4.2.2.2 Primer Type 1 Primer Type 1 for cold application shall consist of chlorinated rubber and plasticizer and, when required, colouring matter, together with solvents needed to give a consistency suitable for application by spray, brush or other approved method. Primer Type 1 shall conform to the requirements given in Table 1. 4.2.2.3 Primer Type 2 Primer Type 2 for cold application shall consist of hydrocarbon resins and plasticizer and, when required, colouring matter, together with solvents needed to give a consistency suitable for application by spray, brush or other approved method. Primer Type 2 shall conform to the requirements given in Table 1. Table 1 — Characteristics of synthetic primers Characteristics Primer Type 1 Primer Type 2 Method of test Flow time (Flow cup n°4 at 23 °C), seconds 35 to 60 35 to 60 EN ISO 2431 Flash point (Abel closed cup), minimum °C 23 23 EN ISO 13736 Volatile matter, maximum % loss by mass 75 75 Annex H 4.2.2.4 Other primers Primers based on other materials (e.g. epoxy resin based aqueous primers) may be used providing that, when used in combination with the selected bitumen based enamel coating, they fulfil the performance criteria given in 4.2.4. 4.2.3 Filler The filler shall comprise a finely divided mineral powder which is not hygroscopic, not electrically conductive and is inert with respect to the other constituents of the tube coating and is resistant to attack by the medium to which it will normally be exposed. It shall be physically and chemically stable at the maximum application temperature of the coating material. NOTE Powdered slate and talc are typical examples of suitable filler types. The filler grading shall meet the following requirements: passing 90 µm: not less than 93 % by mass; passing 250 µm: not less than 99 % by mass; when tested using the wet sieving method in accordance with 7.3 of ISO 2591-1:1988. 4.2.4 Bitumen based coating enamels NOTE 1 Bitumen based coating materials are classified into two categories: Category 1: oxidized bitumen enamel containing filler; Category 2: modified bitumen enamel containing filler. NOTE 2 Bitumen based coating materials are further sub-divided into a number of grades according to the conditions of application and service, see Annex J. 4.2.4.1 Oxidized bitumen enamel (Category 1) Category 1 coating materials shall consist of a uniform mixture of oxidized bitumen and filler. The grading of the filler shall be as described in 4.2.3. SIST EN 10300:2006
EN 10300:2005 (E) 8 Category 1 coating materials shall conform to the requirements for the appropriate grade given in Table 2 when tested by the corresponding methods. Category 1 coating materials detailed in Table 2, in conjunction with an appropriate primer, shall also conform to the requirements for the appropriate grade given in Table 3 when tested by the corresponding methods. Table 2 — Characteristics of Category 1 coating enamels Characteristics Grade a Grade b Grade c Method of test Filler content by ignition, % by mass 25 to 35 25 to 35 45 to 55 Annex K Density at 25 °C, g/cm3 1,2 to 1,4 1,2 to 1,4 1,4 to 1,65 Annex L Softening point (ring and ball), °C 100 to 120 110 to 130 120 to 150 EN 1427 Penetration at 25 °C, 0,1 mm 10 to 20 5 to 17 5 to 15 EN 1426 Flash point (Cleveland open cup), minimum °C 250 260 260 EN ISO 2592 Table 3 — Tests for Category 1 coating enamels Property Grade a Grade b Grade c Method of test 60 °C, 24 h 1,5 — — Sag, maximum mm 75 °C, 24 h — 1,5 1,5 Annex D 0 °C 15 000 — — Impact disbonded area, maximum mm2 25 °C — 6 500 6 500 Annex E 30 °C 3,0 3,0 — 40 °C 3,0 3,0 3,0 50 °C 3,0 3,0 3,0 Peel initial and delayed, maximum mm 60 °C 3,0 3,0 3,0 Annex F, F.4.1 Bend at 0 °C, minimum, mm 20 15 10 Annex G Cathodic disbonding, disbonded radius after 28 d, maximum, mm 10 10 10 Annex I 4.2.4.2 Modified bitumen enamel (Category 2) Category 2 coating materials shall consist of a uniform mixture of modified bitumen and filler. The grading of the filler shall be as described in 4.2.3. Category 2 coating materials shall conform to the requirements for the appropriate grade given in Table 4 when tested by the corresponding methods. Category 2 coating materials specified in Table 4, in conjunction with an appropriate primer, shall also conform to the requirements for the appropriate grade given in Table 5 when tested by the corresponding methods. SIST EN 10300:2006
EN 10300:2005 (E) 9 Table 4 — Characteristics of Category 2 coating enamels Characteristics Grade a Grade b Method of test Filler content by ignition, % by mass 20 to 30 25 to 35 Annex K Density at 25 °C, g/cm3 1,1 to 1,3 1,2 to 1,4 Annex L Softening point (ring and ball), °C 115 to 135 130 to 160 EN 1427 Penetration at 25 °C, 0,1 mm 10 to 30 5 to 15 EN 1426 Flash point (Cleveland open cup), minimum °C 260 260 ISO 2592 Table 5 — Tests for Category 2 coating enamels Property Grade a Grade b Method of test 80 °C, 24 h 1,5 — Sag, maximum mm 90 °C, 24 h — 1,5 Annex D 0 °C — 6 500 Impact disbonded area, maximum mm2 - 10 °C 6 500 — Annex E 30 °C 80 80 40 °C 50 50 50 °C 30 30 Peel initial and delayed, minimum N/20 mm 60 °C 20 20 Annex F, F.4.2 Bend at – 10 °C, minimum mm 20 15 Annex G Cathodic disbonding, disbonded radius after 28 d, maximum mm 7 7 Annex I 4.2.5 Inner-wrap The inner-wrap shall be a non-woven glass fibre tissue which comprises a continuous sheet of randomly arranged glass fibres in an open porous structure bonded by a suitable resin and shall be reinforced by continuous longitudinal glass yarns at maximum 30 mm spacing. The inner-wrap shall have a uniform appearance and be free from holes and tears. The inner-wrap shall be compatible with the bitumen based enamel coating material with which it is used and shall have a texture such that it may be embedded completely within the coating material. The glass shall be of Hydrolytic Class 3 quality as a minimum when tested in accordance with ISO 719. The inner-wrap shall conform to the requirements of Table 6. SIST EN 10300:2006
EN 10300:2005 (E) 10 Table 6 — Characteristics of inner-wrap Characteristics Unit Specification Method of test Mass per area g/m2 50 ± 3 Annex M Loss of mass on ignition (binder content), maximum
% 20 Annex M Tensile strength, minimum
- longitudinally N/50 mm 150 - transverse
N/50 mm 50 EN 12311-1 modified as in Annex N Thickness, minimum mm 0,33 EN 1849-1a Porosity Pa 6 to 19 ASTM D737-96, Annex O a Modified to give a cross-sectional area of 645 mm2 and a pressure of 13,8 kPa. 4.2.6 Outer-wrap The outer-wrap shall have a uniform porosity which allows the air and fumes to escape and the hot coating to bleed through the outer-wrap ensuring it is fused into the outer surface. The outer-wrap shall have a uniform appearance free from holes, slits and other visible faults. The reinforcement yarns shall be spaced evenly across the width. At the time of unrolling at ambient temperature the successive layers of outer-wrap shall not stick to each other. The bitumen based material used for impregnation shall be compatible with the bitumen based enamel coating material. The outer-wrap shall meet the requirements of the type selected from Table 7. NOTE For Guidelines on the use of outer-wrap, see Annex J. SIST EN 10300:2006
EN 10300:2005 (E) 11 Table 7 — Characteristics of outer-wrap Characteristic Unit Type Method of testBase glass/carrier
A B C D E F
Type of base glass/carrier
non-woven glass fibre tissue non-woven glass fibre tissue woven glass fibre
composite glass fibre
composite glass/ polyester fibre
composite glass/ polyester fibre
Mass per area of base glass before impregnation, minimum g/m2 50 80 170 90 70 110 Annex M Outer-wrap Mass per area, minimum g/m2 450 550 250 500 450 450 Annex M Thickness, minimum mm 0,6 0,76 0,76 0,76 0,5 0,6 EN 1849-1 a Tensile strength, minimum
- longitudinal N/50 mm 300 300 800 700 400 800 - transverse N/50 mm 150 230 800 700 200 800 EN 12311-1 modified as in Annex N a Modified to give a cross-sectional area of 645 mm2 and a pressure of 13,8 kPa. 4.2.7 Hot applied bitumen based tapes NOTE Tubes may be coated by the use of pre-formed hot applied bitumen based tapes. The process is analogous to flood coating or extrusion coating but differs significantly in its detail. For guidelines on the use of hot applied bitumen based tapes, see Annex J. Composition, use and application of hot applied bitumen based tapes shall be in accordance with Annex P. 5 Method of application 5.1 Surface preparation 5.1.1 General Tubes and components shall be maintained at least 3 °C above the dew point temperature at all times during the cleaning and coating process. NOTE At the time of application, particularly when the weather is damp and cold, it may be necessary to pre-heat the tubes and components, and this operation should not be prejudicial to the cleanliness of the surface or to the conditions required for the application of the primer. 5.1.2 Pre-blast requirements Immediately prior to blast cleaning, the tubes shall be inspected for surface contamination (oil, grease, temporary corrosion protection, etc.). Where oil, grease or other surface contaminants are present they shall be removed (without spreading over the surface) with a suitable solvent (e.g. Xylene) or a biodegradable emulsifier. SIST EN 10300:2006
EN 10300:2005 (E) 12 All surface defects (slivers, laminations, etc.) detrimental to the surface or to the adhesion of the coating shall be removed. When necessary, tubes shall be washed with fresh potable water before blast cleaning to remove surface contaminants including mud, salts and other loosely adhering mineral matter. The tubes and components shall then be preheated to a minimum of 30 °C in order to remove moisture and to prevent contamination of the abrasive media. 5.1.3 Blast cleaning Tubes and components shall be blast cleaned. The grade of abrasive shall give a blast peak to trough surface profile of 75 µm ± 25 µm. The degree of cleanliness shall be to Sa 2½ in accordance with EN ISO 8501-1. Only dry abrasive techniques shall be employed. The abrasive shall be reusable chilled iron grit or steel grit or a mixture of grit and shot. The abrasive shall be kept free from dust, salts and other impurities. Sand shall not be used. 5.2 Priming The primer shall be applied to a dust free, clean, dry, prepared surface. The primer shall be applied in accordance with the primer manufacturer’s recommendations. The primer film applied at the thickness specified by the primer manufacturer shall be uniform and continuous. The dry film thickness shall be measured at least once per shift. The primer shall be free from runs, drips, sags, misses, holidays and bare areas. Tubes not primed correctly shall be re-cleaned and re-primed. Tubes on which the primer has deteriorated, or become contaminated shall be rejected and shall be re-cleaned and re-primed. 5.3 Application of enamel coating, inner-wraps and outer-wrap 5.3.1 Enamel preparation The enamel shall be heated in kettles fitted with mechanical stirrers providing continuous agitation of the enamel, and accurate, easily readable recording thermometers, which extend to within 100 mm of the bottom of the kettle. The thermometers shall be calibrated and maintained in working order. NOTE Bulk deliveries of molten enamel can be transferred directly to the kettles. Solid enamel shall be broken up into small pieces, not exceeding 10 kg, in a suitable place free from contamination. The heat setting may be increased once a quantity of molten enamel forms in the kettle bottom, but the heat initially shall be applied on a low setting. Whilst the enamel is molten it shall be stirred and the lid of the kettle kept firmly closed, unless to withdraw molten enamel or to add fresh material. The quantity of enamel remaining in the kettle, which may be reheated, shall never exceed 10 % of the fresh loading. The enamel shall be heated to the manufacturer's recommended application temperature and shall not be held for a longer period than that recommended by the manufacturer. Enamel that has been heated in excess of the manufacturer's maximum recommended temperature or held at application temperature for over 6 h shall be tested for softening point and penetration which shall conform to Table 3 or Table 4 depending on the category of enamel. Further tests shall be conducted at regular intervals, agreed at the time of ordering, to confirm that the material continues to conform to Table 3 or Table 4, otherwise it shall be rejected and discarded. All application kettles shall be equipped with screens to exclude particles of foreign matter or other materials that may cause coating flaws. Ensure there is no mixing of material from different sources or of different categories unless experience has shown that the final product has satisfactory properties. In particular it shall be recognized that the chemical and physical characteristics of coal-tar-based coatings differ from those of bitumen-based coatings and that the two kinds of coating shall not be blended together in protective coatings. The plant shall be SIST EN 10300:2006
EN 10300:2005 (E) 13 cleaned out thoroughly when the use of bitumen coating materials follows that of coal-tar coating materials or vice versa. The same precaution shall be taken when interchanging between different types of bitumen enamels. The residual material removed from the kettles during cleaning shall be discarded, not blended with other enamel. 5.3.2 Application 5.3.2.1 General Coat and wrap application shall follow priming within 2 h, and the primed surface shall be dry and free from surface contamination prior to enamel application. NOTE Thickness recommendations for Category 1 and Category 2 coatings are given in Annex J. 5.3.2.2 Category 1 enamel Category 1 enamel shall be applied by flood coating or pouring with equipment for spirally wrapping the inner-wrap(s) and outer-wrap under controlled tension using trained operators. Such equipment shall be approved prior to commencement. The flood coat of enamel shall have the inner-wrap(s) pulled in and the outer-wrap pulled on immediately following flood coating. The inner-wrap(s) shall not touch the surface of the pipe and shall be embedded in the middle third of the enamel thickness. If two inner-wraps are required, they shall be separated at spacings to be specified at the time of ordering, see 6.2.2. The outer-wrap shall be pulled onto the enamel and be well bonded with some bleed through of enamel occurring. All wraps shall be wrinkle-free with minimum overlap of 12 mm. The enamel shall be applied at a temperature in accordance with the manufacturer's recommendations. The enamel shall flow evenly onto the pipe and be free from any solid particles which may cause irregularities in flow. The coating shall be cut-back where necessary to meet the specification. The method of removal of cut-back shall be approved prior to commencement of coating. 5.3.2.3 Category 2 enamel NOTE 1 Due to their higher viscosity, Category 2 materials are not suitable for flood coating. Category 2 materials shall be applied by an extrusion process. Equipment shall be used for spirally wrapping the outer-wrap under controlled ten
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