1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 976-2 : 1997 The Eu
2、ropean Standard EN 976-2 : 1997 has the status of a British Standard ICS 23.020.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Underground tanks of glass-reinforced plastics (GRP) Horizontal cylindrical tanks for the non-pressure storage of liquid petroleum based fuels Par
3、t 2. Transport, handling, storage and installation of single wall tanksThis British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 1997 ISBN 0 5
4、80 28930 3 BS EN 976-2 : 1997 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 976-2 : 1997. The UK participation in its preparation was entrusted to Technical Committee PRI/64, GRP tanks for underground pet
5、rol storage, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate t
6、hem in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section e
7、ntitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover,
8、the EN title page, pages 2 to 16, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any
9、means reserved worldwide for CEN national Members. Ref. No. EN 976-2 : 1997 E EUROPEAN STANDARD EN 976-2 NORME EUROPE ENNE EUROPA ISCHE NORM July 1997 ICS 23.020.10 Descriptors: Petroleum products, storage, storage tanks, underground tanks, thermosetting resins, reinforced plastics, glass reinforced
10、 plastics, specifications, transportation, installation, certification English version Underground tanks of glass-reinforced plastics (GRP) Horizontal cylindrical tanks for the non-pressure storage of liquid petroleum based fuels Part 2: Transport, handling, storage and installation of single wall t
11、anks Re servoirs enterre s en plastiques renforce s de verre (PRV) Re servoirs cylindriques horizontaux pour le stockage sans pression de carburants ou combustibles pe troliers liquides Partie 2: Transport, manutention, stockage et installation de re servoirs a simple paroi Unterirdische Tanks aus t
12、extilglasversta rkten Kunststoffen (GFK) Liegende zylindrische Tanks fu r die drucklose Lagerung von flussigen Kraftstoffen auf Erdo lbasis Teil 2: Transport, Handhabung, Zwischenlagerung und Einbau einwandiger Tanks This European Standard was approved by CEN on 1997-06-21. CEN members are bound to
13、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
14、 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
15、 official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 976-2 : 1997 BSI 1997 Foreword
16、 This European Standard has been prepared by Technical Committee CEN/TC 210, GRP tanks and vessels, 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 January
17、 1998, and conflicting national standards shall be withdrawn at the latest by January 1998. The 4 Parts of this European Standard cover the construction and installation requirements of horizontal, cylindrical GRP tanks used for the underground non-pressure storage of petroleum based fuels, e.g. pet
18、rol and diesel fuel storage in service stations, heating oil storage for buildings. The 4 Parts are: Part 1: Requirements and test methods for single wall tanks Part 2: Transport, handling, storage and installation of single wall tanks Part 3: Requirements and test methods for double wall tanks Part
19、 4: Transport, handling, storage and installation of double wall tanks The standard is written in different parts in order to clearly define the involvement and responsibilities of different parties in the construction of the tank, its installation and the assurance of a good, safe performance durin
20、g use. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norw
21、ay, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Transport 3 5 Handling 4 6 Storage 4 7 Tank certification 4 8 Installation procedure 4 Page 8.1 Preliminary checks 4 8.2 Preparation of the excavation 5 8.3
22、Ground works 5 8.4 Excavation dimensions 5 8.5 Geotextiles 5 8.6 Tank anchoring 5 8.7 Concrete base slabs 5 8.8 Sleepers 5 8.9 Visual inspection and leaktightness test 6 8.10 On site repair 6 8.11 Lifting the tank 6 8.12 Level test 6 8.13 Tank diameter 8 8.14 Anchoring 8 8.15 Backfill materials 8 8.
23、16 Pressure test 8 8.17 Dimensional tests 8 8.18 Completion of installation 8 8.19 Completion of top cover and surfaces 8 Annexes A (normative) Installation components requirements 9 A.1 Backfill material 9 A.2 Anchorage points 9 A.3 Anchor straps 9 A.4 Access chamber 9 B (informative) Installation
24、recommendations 9 B.1 Concrete base-construction 9 B.2 Installation procedure for pea shingle or crushed stone backfills (gravel) 9 B.3 Installation procedures using mechanically compacted sand backfill 11 B.4 Classification of ground conditions 11 B.5 Sleepers Construction 11 B.6 Concrete bases for
25、 tank anchoring 11 C (informative) Installation checklist 15Page 3 EN 976-2 : 1997 BSI 1997 1 Scope This Part 2 of European Standard EN 976 specifies the requirements for the transportation, site handling, storage and installation of horizontal, cylindrical single wall tanks made of glass reinforced
26、 thermosetting resins used for the underground non-pressure storage of liquid petroleum based fuels, complying with the requirements of EN 976-1. Ancillary equipment vital to the satisfactory operation of the installation comprising access chamber, cover and frame are also described. 2 Normative ref
27、erences This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of t
28、hese publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prEN 976-1 Underground tanks of glass-reinforced plastics (GRP) Horizontal cylindrical tanks for the non-pressure
29、 storage of liquid petroleum based fuels Part 1: Requirements and test methods for single wall tanks 3 Definitions For the purposes of this standard the following definitions apply: 3.1 cylinder Part of the tank that forms the cylindrical portion of the body. 3.2 end Curved portions of the tank loca
30、ted at the ends of the cylindrical portion. 3.3 cylinder reinforcing ribs Circumferential external ribs fully bonded to the cylinder or integrally formed with it. 3.4 compartment Portion of the tank created by an internal partition. 3.5 manway Hole in the uppermost portion of the cylinder or tank al
31、lowing access. 3.6 manway lid Plate bolted to the manway. 3.7 access chamber Chamber to provide access to the manway lid. 3.8 anchorage positions Clearly marked positions on the tank which can be used as the location of the holding down straps used to anchor the tank. 3.9 anchorage points Positions
32、to which the holding down straps can be secured. 3.10 holding down straps Straps used to hold down the tank. 3.11 backfill Non-cohesive, granular material used to surround the tank and provide support and restraint. 3.12 excavation Pit into which one or more tanks may be installed. 3.13 tank install
33、er Company responsible for the tank installation. 3.14 manufacturer Company creating and selling the tank complying with EN 976-1. 3.15 sleepers; deadmen Concrete beams laid parallel to the tank axis which allow the soil weight above the beams to be utilized in tank anchoring (see figure B.4). 3.16
34、lifting position Position on the tank used for lifting purposes. 3.17 water table Permanent, short term tidal or frequently changing water level below ground level at the tank location which marks the upper level of the zone of groundwater saturation. 3.18 high water table Site with a water table ha
35、ving the depth below ground to the average seasonal water level of between 0 and 4 m. 3.19 tank Tank complying with EN 976-1. 3.20 visual inspection Examination of the tank by the unaided eye. 3.21 sheet pile Timber or steel sheeting used to support the sides of an excavation. 4 Transport The tank s
36、hall be placed on the transporter ensuring that it is not placed on any sharp protrusions that will cause damage. Suitable cradles or checks shall be used. The tank shall be secured on the vehicle by means of GRP , nylon or similar non-metallic straps. The straps shall only be tightened sufficiently
37、 so as to prevent tank movement. Care shall be taken not to overtighten the straps and cause damage of the tank.Page 4 EN 976-2 : 1997 BSI 1997 Figure 1. Handling of tanks 5 Handling When demounting the tanks from the transporter the tank shall only be lifted by devices provided by the tank manufact
38、urer or at lifting positions marked on the tank using non-metallic straps or webbing, see figure 1. Control of the tank whilst suspended shall be effected by the use of guide ropes. 6 Storage If stored on site the tanks shall be stored on a level surface free from sharp protrusions and supported to
39、prevent local damage. The storage location shall be selected so as to minimize accidental damage. Tanks shall be chocked. 7 Tank certification Prior to installation the installer shall obtain from the manufacturer (or third party certification body) a certificate certifying that the tank complies wi
40、th EN 976-1. 8 Installation procedure 8.1 Preliminary checks Prior to the commencement of installation, the native soil conditions should be determined and recorded and the installation type selected as defined in annex B. The type of ground will determine the dimensions of the excavation, the need
41、for any earth work support or geotextiles. The paths of underground or overhead services shall be identified and where necessary diverted prior to the commencement of work.Page 5 EN 976-2 : 1997 BSI 1997 Table 1. Excavation dimensions Normal installation Installation with traffic load a 500 to 2 000
42、 mm 650 to 2 000 mm 1 000 to 2 000 mm (min. 200 mm backfill) (backfill plus (backfill plus asphalt reinforced concrete) or paving slabs) b Stable soil: min. 450 mm Stable soil: min. 450 mm Unstable soil: min. 1/2 diameter Unstable soil: min. 1/2 diameter NOTE. Traffic load is based on a single wheel
43、 load of 8 tons. 8.2 Preparation of the excavation Set out the excavation. Begin the excavation taking care not to undermine existing structures nor damage underground services. All excavated material shall be removed from the immediate vicinity of the excavation to ensure it does not contaminate th
44、e backfill. Keep the excavation dry by using pumps where necessary. Level the excavation base. 8.3 Ground works When the ground has been classified as unstable then preventative measures such as battering back or sheet piling should be taken to prevent inward collapse of the side walls into the exca
45、vation. When sheet piling is used care shall be taken to ensure that neither tank nor back fill material is disturbed by sheeting removal. Voids behind the sheeting and voids created by sheeting removal must be filled with backfill compacted to required density. It is advised to pull the sheeting in
46、 stages as backfilling progresses to allow the backfill to be properly placed and compacted against the native pit walls. 8.4 Excavation dimensions a) Stable soils The excavation shall be large enough to provide a minimum of 450 mm between the excavation sides and the walls and ends of the tank(s) a
47、nd 450 mm between tank(s). b) Unstable soils The excavation shall be large enough to provide a minimum of 1/2 diameter between the excavation sides and the walls and ends of the tanks and 450 mm between tanks, except when permanent sheet piles are used to confine the excavation. The excavation shall
48、 provide for the minimum cover (see 8.19) of backfill above the tanks and minimum 200 mm below. The maximum allowable cover above the tanks is 2 m. The depth shall take into account any falls provided in the delivery pipework. See table 1 and figures 2 and 3. 8.5 Geotextiles In cases of unstable gro
49、und as defined in annex B, clause B.4, or where ground water conditions could lead to migration of the backfill material, a geotextile filter fabric shall be installed. The geotextile shall be laid in accordance with the geotextile manufacturers instructions. The geotextile shall extend under any base slab a minimum of 300 mm. Alternatively, the geotextile can be placed over the base slab a minimum of 1000 mm and covered by backfill. Where sleepers are used the geotextile shall pass underneath the sleepers and cover t
