SIST EN 14620-5:2007
(Main)Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C - Part 5: Testing, drying, purging and cool-down
Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C - Part 5: Testing, drying, purging and cool-down
This European Standard specifies the requirements for testing, drying, purging and cool-down of the refrigerated liquefied gas storage tanks.
This European Standards deals with the design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and –165 °C.
Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Stahltanks für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -165 °C - Teil 5: Prüfen, Trocknen, Inertisieren und Kaltfahren
Dieser Teil von EN 14620 legt Anforderungen an das Prüfen, Trocknen, Inertisieren und Kaltfahren von Tanks zur Lagerung von tiefkalt verflüssigten Gasen fest.
Conception et fabrication de réservoirs en acier a fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -165 °C - Partie 5: Essais, séchage, inertage et mise en froid
La présente Norme Européenne spécifie les exigences relatives aux essais, séchage, inertage et mise en froid des réservoirs de stockage de gaz liquéfiés réfrigérés.
La présente Norme Européenne présente la conception et fabrication de réservoirs en acier a fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et - 165 °C.
Načrtovanje in proizvodnja na mestu postavitve grajenih navpičnih, valjastih jeklenih posod z ravnim dnom za shranjevanje hlajenih utekočinjenih plinov z delovnimi temperaturami med 0 °C in –165 °C - 5. del: Preskušanje, sušenje, čiščenje in ohlajanje
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C
- Part 5: Testing, drying, purging and cool-downConception et fabrication de réservoirs en acier a fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -165 °C - Partie 5: Essais, séchage, inertage et mise en froidAuslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Stahltanks für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -165 °C - Teil 5: Prüfen, Trocknen, Inertisieren und KaltfahrenTa slovenski standard je istoveten z:EN 14620-5:2006SIST EN 14620-5:2007en23.020.10UH]HUYRDUMLStationary containers and tanksICS:SLOVENSKI
STANDARDSIST EN 14620-5:200701-januar-2007
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14620-5
September 2006 ICS 23.020.10 English Version
Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C - Part 5: Testing, drying, purging and cool-down
Conception et fabrication de réservoirs en acier à fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -165 °C - Partie 5: Essais, séchage, inertage et mise en froid
Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Stahltanks für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -165 °C - Teil 5: Prüfen, Trocknen, Inertisieren und Kaltfahren This European Standard was approved by CEN on 20 February 2006.
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 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14620-5:2006: E
EN 14620-5:2006 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Hydrostatic and pneumatic testing.4 4.1 Hydrostatic test.4 Table 1 — Hydrostatic test requirements.5 4.2 Pneumatic test.8 5 Drying, purging and cool-down.9 5.1 Procedures.9 5.2 Drying.10 5.3 Purging.10 5.4 Cool-down.10 6 Decommissioning.10 Annex A (informative)
Cool-down of the tank.12 Bibliography.13
EN 14620-5:2006 (E) 3 Foreword This European Standard (EN 14620-5:2006) has been prepared by Technical Committee CEN/TC 265 “Site built metallic tanks for the storage of liquids”, 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 or by endorsement, at the latest by March 2007, and conflicting national standards shall be withdrawn at the latest by March 2007. EN 14620 Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C consists of the following parts: Part 1: General; Part 2: Metallic components; Part 3: Concrete components; Part 4: Insulation components; Part 5: Testing, drying, purging and cool-down. 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14620-5:2006 (E) 4
1 Scope This European Standard specifies the requirements for testing, drying, purging and cool-down of the refrigerated liquefied gas storage tanks. This European Standards deals with the design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and –165 °C. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14620-1:2006, Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0°C and –165 °C — Part 1: General 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 14620-1:2006 apply. 4 Hydrostatic and pneumatic testing 4.1 Hydrostatic test 4.1.1 General A hydrostatic test shall be carried out. The hydrostatic test shall demonstrate that: tank is designed and constructed to contain the product (no leakage); NOTE A leakage test is not applicable for membrane tanks. Instead an ‘ammonia test’ is carried out on the membrane after completion of welding. An ammonia sensitive paint is applied on the weld seam on the inside of the tank. Ammonia vapour is introduced in the insulation space and in case of a leak the ammonia will react with the paint resulting in a change of colour from yellow to blue. In order to calibrate the test, reference holes are made in the membrane so that proper performance of the inspection method is ensured. After closing of all leaks, another test is carried out. The paint on the inside of the tank is removed by ‘vacuum cleaning’. For reference, the NF A 09-107 note. foundation is able to support the tank contents. 4.1.2 Test requirements for each type of tank For the various tank types, the hydrostatic test shall be carried out in accordance with Table 1. The contractor shall prepare a specification with all the actions to be taken. The test results shall be documented.
EN 14620-5:2006 (E) 5 Table 1 — Hydrostatic test requirements Contents Single
Double
Full
Membrane tank
containment containment containment
Tank Inner tank Inner tank
(type II-III steels):
(type I-II steels):
(type I-II steels):
Ammonia, FH FH FH
butane,
Outer tank Outer tank
propane,
(type I-II steels): (type I-II steels):
and
FH FH
propylene
Outer tank Outer tank Outer tank
(pre-stressed conc): (pre-stressed conc): (pre-stressed conc):
No test (see NOTE 2) No test (see NOTE 2) PH (see a)
Tank Inner tank Inner tank
(type IV steel): (type IV steel): (type IV steel):
PH PH PH
Ethane,
Outer tank steel Outer tank steel
Ethylene and
(type IV steel): (type IV steel):
LNG
PH PH
Outer tank Outer tank Outer tank
(pre-stressed conc): (pre-stressed conc): (pre-stressed conc):
No test (see NOTE 2) No test (see NOTE 2) PH (see NOTE 2) a
In the case of a membrane tank, the membrane can’t be hydrostatically tested. To ensure that the foundation is able to support the tank contents and the tank integrity is ensured, the concrete outer tank shall be hydrostatically tested before the insulation and membrane are installed. NOTE 1
FH means Full height hydrostatic test;
PH means Partial height hydrostatic test. NOTE 2
Hydrostatic testing of the pre-stressed concrete outer tank is not required, see prEN 14620-3:2005, A.2.
EN 14620-5:2006 (E) 6
4.1.3 Additional requirements The following additional requirements shall apply: for a full height hydrostatic test, the inner tank shall be filled to the maximum design liquid level. The same quantity of water shall be used for testing of the outer tank; for a partial height hydrostatic test of the inner tank, the test level shall be equal to 1,25 times the height of the maximum design liquid level multiplied by the density of the specified product to be stored. The same quantity of water contained shall be used for testing of the outer tank; when outer tanks are hydrostatically tested, a suitable water barrier shall be provided to prevent that test water ingress in to the bottom insulation; care shall be taken during filling of the annular space that water levels are controlled and regulated to prevent differential levels between the inner and annular spaces; hydrostatic test shall not be carried out until all welded accessories to the shell and the bottom of the tank are in place. Welding shall not be allowed after completion of the hydrostatic test; for tanks which are to be insulated with perlite powder, the hydrostatic test shall be carried out before installation of the perlite powder; test level of a membrane tank shall be based on the partial hydrostatic test requirement indicated above; contractor shall ensure that the quality of the water is such that no damage to the steel/concrete can occur. 4.1.4 Quality of the water The suitability of the water for hydrostatic testing shall be demonstrated. Special attention shall be paid to possible corrosion. The following types of corrosion shall be considered: general corrosion; galvanic corrosion NOTE 1 galvanic corrosion (fresh and seawater) is an electrochemical form of corrosion that can occur when a metal or alloy is electrically connected to another metal or alloy with a different electrochemical potential. Both metals should be exposed to a common electrolyte and electrical path. Welding of metals can lead to dissimilar metal compositions between the weld, Heat
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