1、November 2008DEUTSCHE NORM English price group 28No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 75.180.20!$Rx“1478504
2、www.din.deDDIN EN ISO 28300Petroleum, petrochemical and natural gas industries Venting of atmospheric and low-pressure storage tanks(ISO 28300:2008)English version of DIN EN ISO 28300:2008-11Erdl, petrochemische und Erdgasindustrie Be- und Entlftung von Lagertanks mit atmosphrischem Druck und niedri
3、gem berdruck(ISO 28300:2008)Englische Fassung DIN EN ISO 28300:2008-11www.beuth.deDocument comprises 82 pagesDIN EN ISO 28300:2008-11 2 National foreword This standard has been prepared by Technical Committee ISO/TC 67 “Materials, equipment and offshore structures for petroleum, petrochemical and na
4、tural gas industries”, SC 6 “Processing equipment and systems” (Secretariat: AFNOR, France) in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” (Secretariat: AFNOR, France). The responsible German
5、body involved in its preparation was the Normenausschuss Tankanlagen (Tank Installations Standards Committee), Technical Committee NA 104-02-05 AA Flammensperren und Tank-lftungseinrichtungen. This standard is intended to replace Annex L “Requirements for venting systems” of DIN EN 14015 “Specificat
6、ion for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above”. The German experts submitted a corresponding comment during formal vote. The DIN Standards corresponding to the Inte
7、rnational Standards referred to in this document are as follows: ISO 4126-4 DIN EN ISO 4126-4 ISO 23251 DIN EN ISO 23251 IEC 60079-10 DIN EN 60079-10 National Annex NA (informative) Bibliography DIN EN ISO 4126-4, Safety devices for protection against excessive pressure Part 4: Pilot operated safety
8、 valves DIN EN ISO 23251, Petroleum, petrochemical and natural gas industries Pressure-relieving and depressuring systems DIN EN 60079-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 28300June 200
9、8ICS 75.180.20English VersionPetroleum, petrochemical and natural gas industries - Venting ofatmospheric and low-pressure storage tanks (ISO 28300:2008)Industries du ptrole, de la ptrochimie et du gaz naturel -Ventilation des rservoirs de stockage pressionatmosphrique et basse pression (ISO 28300:20
10、08)Erdl, petrochemische und Erdgasindustrie - Be- undEntlftung von Lagertanks mit atmosphhrischem DruckThis European Standard was approved by CEN on 14 June 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard
11、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 CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, Germ
12、an). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Repu
13、blic, 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 STANDARDIZATIONCOMIT EUROPEN DE NOR
14、MALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 28300:2008: Eund niedrigem berdruck (ISO 28300:2008)Contents Page 2 DIN EN ISO 28
15、300:2008-11 EN ISO 28300:2008 (E) Foreword 3 Introduction 4 1 Scope .5 2 Normative references .5 3 Terms, definitions and abbreviated terms .5 4 Non-refrigerated aboveground tanks .8 4.1 General 8 4.2 Causes of overpressure or vacuum .8 4.3 Determination of venting requirements .11 4.4 Means of vent
16、ing 22 4.5 Considerations for tanks with potentially flammable atmospheres .23 4.6 Relief-device specification 24 4.7 Installation of venting devices 26 5 Refrigerated aboveground and belowground tanks .27 5.1 General 27 5.2 Causes of overpressure or vacuum .27 5.3 Relief-device specification 30 5.4
17、 Installation of venting devices 30 6 Testing of venting devices 31 6.1 General 31 6.2 Flow-test apparatus .32 6.3 Method for determining capacities .33 6.4 Production testing 37 7 Manufacturers documentation and marking of venting devices 38 7.1 Documentation .38 7.2 Marking 38 Annex A (informative
18、) Alternative calculation of normal venting requirements .40 Annex B (informative) Basis of emergency venting for Tables 7 and 8 .49 Annex C (informative) Types and operating characteristics of venting devices 53 Annex D (informative) Basis of sizing equations .62 Annex E (informative) Basis for nor
19、mal out-breathing and normal inbreathing .74 Annex F (informative) Guidance for inert-gas blanketing of tanks for flashback protection 76 Bibliography .79 Foreword 3 EN ISO 28300:2008 (E) DIN EN ISO 28300:2008-11 This document (EN ISO 28300:2008) has been prepared by Technical Committee ISO/TC 67 “M
20、aterials, equipment and offshore structures for petroleum and natural gas industries“ in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” the secretariat of which is held by AFNOR. This European St
21、andard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn at the latest by December 2008. Attention is drawn to the possibility that some of the elements
22、 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
23、an Standard: Austria, Belgium, Bulgaria, 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 K
24、ingdom. Endorsement notice The text of ISO 28300:2008 has been approved by CEN as a EN ISO 28300:2008 without any modification. Introduction This International Standard was developed from the 5thedition of API Std 2000 and EN 14015:2005, with the intent that the 6thedition of API Std 2000 be identic
25、al to this International Standard. This International Standard has been developed from the accumulated knowledge and experience of qualified engineers of the oil, petroleum, petrochemical, chemical and general bulk liquid storage industry. Engineering studies of a particular tank can indicate that t
26、he appropriate venting capacity for the tank is not the venting capacity estimated in accordance with this International Standard. The many variables associated with tank-venting requirements make it impractical to set forth definite, simple rules that are applicable to all locations and conditions.
27、 In this International Standard, where practical, US Customary (USC) units are included in parentheses or in separate tables, for information. 4 DIN EN ISO 28300:2008-11 EN ISO 28300:2008 (E) 1 Scope This International Standard covers the normal and emergency vapour venting requirements for abovegro
28、und liquid petroleum or petroleum products storage tanks and aboveground and underground refrigerated storage tanks designed as atmospheric storage tanks or low-pressure storage tanks. Discussed in this International Standard are the causes of overpressure and vacuum; determination of venting requir
29、ements; means of venting; selection, and installation of venting devices; and testing and marking of relief devices. This International Standard is intended for tanks containing petroleum and petroleum products but it can also be applied to tanks containing other liquids; however, it is necessary to
30、 use sound engineering analysis and judgment whenever this International Standard is applied to other liquids. This International Standard does not apply to external floating-roof tanks. 2 Normative references The following referenced documents are indispensable for the application of this document.
31、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4126-4, Safety devices for protection against excessive pressure Part 4: Pilot operated safety valves ISO 16852, Flame arresters Perfor
32、mance requirements, test methods and limits for use ISO 23251, Petroleum, petrochemical and natural gas industries Pressure-relieving and depressuring systems IEC 60079-10, Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas DIN 41191)(all parts), Above-grou
33、nd cylindrical flat-bottom tank structures of metallic materials 3 Terms, definitions and abbreviated terms For the purposes of this document, the following terms, definitions and abbreviated terms apply. 3.1 accumulation pressure increase over the maximum allowable working pressure or design pressu
34、re of the vessel allowed during discharge through the pressure-relief device NOTE Accumulation is expressed in units of pressure or as a percentage of MAWP or design pressure. Maximum allowable accumulations are established by pressure-design codes for emergency operating and fire contingencies. 1)
35、Deutsches Institut fr Normung (DIN), Burggrafenstrasse 6, Berlin, Germany D-10787. 5 EN ISO 28300:2008 (E) DIN EN ISO 28300:2008-11 3.2 adjusted set pressure inlet static pressure at which a pressure-relief valve is adjusted to open on the test stand See set pressure (3.19). NOTE 1 Adjusted set pres
36、sure is equivalent to set pressure for direct-mounted end-of-line installations. NOTE 2 The adjusted test pressure includes corrections for service conditions of superimposed back-pressure. 3.3 British thermal unit Btu unit of heat that increases the temperature of one pound of water by one degree F
37、ahrenheit 3.4 emergency venting venting required when an abnormal condition, such as ruptured internal heating coils or an external fire, exists either inside or outside a tank 3.5 non-refrigerated tank container that stores material in a liquid state without the aid of refrigeration, either by evap
38、oration of the tank contents or by a circulating refrigeration system NOTE Generally, the storage temperature is close to, or higher than, ambient temperature. 3.6 normal cubic metres per hour Nm3/h SI unit for volumetric flow rate of air or gas at a temperature of 0 C and pressure of 101,3 kPa, exp
39、ressed in cubic metres per hour 3.7 normal venting venting required because of operational requirements or atmospheric changes 3.8 overpressure pressure increase at the PV valve inlet above the set pressure, when the PV valve is relieving NOTE 1 Overpressure is expressed in pressure units or as a pe
40、rcentage of the set pressure. NOTE 2 The value or magnitude of the overpressure is equal to the value or magnitude of the accumulation when the valve is set at the maximum allowable working pressure or design pressure and the inlet piping losses are zero. 3.9 petroleum crude oil 3.10 petroleum produ
41、cts hydrocarbon materials or other products derived from crude oil 3.11 PV valve weight-loaded, pilot-operated, or spring-loaded valve, used to relieve excess pressure and/or vacuum that has developed in a tank 6 DIN EN ISO 28300:2008-11 EN ISO 28300:2008 (E) 3.12 rated relieving capacity flow capac
42、ity of a relief device expressed in terms of air flow at standard or normal conditions at a designated pressure or vacuum NOTE Rated relieving capacity is expressed in SCFH or Nm3/h. 3.13 refrigerated tank container that stores liquid at a temperature below atmospheric temperature with or without th
43、e aid of refrigeration, either by evaporation of the tank contents or by a circulating refrigeration system 3.14 relief device device used to relieve excess pressure and/or vacuum that has developed in a tank 3.15 relieving pressure pressure at the inlet of a relief device when the fluid is flowing
44、at the required relieving capacity 3.16 required flow capacity flow through a relief device required to prevent excessive pressure or vacuum in a tank under the most severe operating or emergency conditions 3.17 rollover uncontrolled mass movement of stored liquid, correcting an unstable state of st
45、ratified liquids of different densities and resulting in a significant evolution of product vapour 3.18 standard cubic feet per hour SCFH USC unit for volumetric flow rate of air or gas (same as free air or free gas) at a temperature of 15,6 C (60 F) and an absolute pressure of 101,3 kPa (14,7 psi),
46、 expressed in cubic feet per hour 3.19 set pressure gauge pressure at the device inlet at which the relief device is set to start opening under service conditions 3.20 thermal inbreathing movement of air or blanketing gas into a tank when vapours in the tank contract or condense as a result of weath
47、er changes (e.g. a decrease in atmospheric temperature) 3.21 thermal out-breathing movement of vapours out of a tank when vapours in the tank expand and liquid in the tank vapourizes as a result of weather changes (e.g. an increase in atmospheric temperature) 3.22 wetted area surface area of a tank
48、exposed to liquid on the interior and heat from a fire on the exterior 7 EN ISO 28300:2008 (E) DIN EN ISO 28300:2008-11 4 Non-refrigerated aboveground tanks 4.1 General Clause 4 covers the causes of overpressure or vacuum; determination of venting requirements; means of venting; selection and instal
49、lation of venting devices. 4.2 Causes of overpressure or vacuum 4.2.1 General When determining the possible causes of overpressure or vacuum in a tank, consider the following: a) liquid movement into or out of the tank; b) tank breathing due to weather changes (e.g. pressure and temperature changes); c) fire exposure; d) other circumstances resulting from equipment failures and operating errors. There can be additional circumstances that should be considered but are not included in this International Standard. 4.2.2 Liquid movement into or ou
