1、BRITISH STANDARD BS 5276-2: 2003 Pressure vessel details (dimensions) Part 2: Specification for saddle supports for horizontal cylindrical pressure vessels ICS 23.020.30 BS 5276-2:2003 This British Standard was published under the authority of the Standards Policy and Stategy Committee on 7 July 200
2、3 BSI 7 July 2003 First published February 1983 The following BSI references relate to the work on this British Standard: Committee reference PVE/1 Draft for comment 01/713941 DC ISBN 0 580 41853 7 Committees responsible for this British Standard The preparation of this British Standard was entruste
3、d to Technical Committee PVE/1, Pressure vessels, upon which the following bodies were represented: Air Conditioning and Refrigeration Board (ACRIB) British Chemical Engineering Contractors Association British Compressed Gases Association British Refrigeration Association British Valve and Actuator
4、Manufacturers Association (BVAMA) Department of Trade and Industry (Standards and Technical Regulations Directorate) Electricity Association Energy Industries Council Engineering Equipment and Materials Users Association Health and Safety Executive LP Gas Association Lloyds Register of Shipping Powe
5、r Generation Contractors Association (PGCA BEAMA Ltd.) Process Plant Association Safety Assessment Federation Ltd. The Welding Institute Amendments issued since publication Amd No Date CommentsBS 5276-2:2003 BSI 7 July 2003 i Contents Page Committee responsible Inside front cover Foreword ii 1S c o
6、p e 1 2 Normative references 1 3M a t e r i a l s 1 4D i m e n s i o n s 1 5 Manufacture 2 6 Design considerations 2 7 Maximum permissible loads 6 Annex A (informative) Derivation of maximum permissible loads 13 Bibliography 15 Figure 1 Saddle supports for horizontal vessels of internal diameter of
7、600 mm to 1 150 mm 3 Figure 2 Saddle supports for horizontal vessels of internal diameter of 1 200 mm to 3 000 mm 4 Figure 3 Selection chart for type of sliding support required 7 Figure 4 Typical design of steel-on-steel type of sliding support 8 Figure 5 Typical design of sliding support with low
8、friction materials 9 Figure 6 Location of supports relative to domed ends 10 Table 1 Tensile forces in holding down bolts 5 Table 2 Coefficient K for calculating permissible load (W v ) per saddle support 11BS 5276-2:2003 ii BSI 7 July 2003 Foreword This part of BS 5276 has been prepared by Technica
9、l Committee PVE/1 to cover the dimensions of pressure vessel details. It supersedes BS 5276-2:1983, which is withdrawn. This new edition of BS 5276-2 incorporates technical changes only. It does not reflect a full review or revision of this standard, which will be undertaken in due course. BS 5276 i
10、s published in the following Parts: Part 1: Specification for davits for branch covers of steel vessels; Part 2: Specification for saddle supports for horizontal cylindrical pressure vessels; Part 4: Standardized pressure vessels. Part 3 has been withdrawn without being replaced. This Part provides
11、data for evaluating the maximum permissible loads on shells of vessels, this data being based upon the requirements of PD 5500. Attention is drawn to PD 6497 which indicates the derivation of the basic equations and constants used in PD 5500. Maximum permissible loads for support parts are also spec
12、ified. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
13、inside front cover, pages i and ii, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 5276-2:2003 BSI 7 July 2003 1 1 Scope This Part of BS 5276 specifies dimensions and materials for saddle supports welded to stationar
14、y horizontal vessels with internal diameters between 600 mm and 3 000 mm, conforming to PD 5500 and having ellipsoidal or torispherical dished ends. This British Standard is applicable to saddle supports welded to vessels manufactured from carbon, carbon manganese and austenitic steels having a perm
15、issible design stress not exceeding 210 N/mm 2at 50 C, with corresponding values at higher temperatures. 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
16、 latest edition of the referenced document (including any amendments) applies. BS 21, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions). BS 449-2, Use of structural steel in building Part 2: Metric units. PD 5500:2003, Speci
17、fication for unfired fusion welded pressure vessels. BS EN 10025, Hot rolled products of non-alloy structural steels Technical delivery conditions. BS EN 13000 (all parts), Plastics Polytetrafluoroethylene (PTFE) semi finished products. 3 Materials 3.1 Saddle supports The materials used for the cons
18、truction of the supports shall be as follows. a) The saddle plate, which is welded to the vessel, shall be made from material in accordance with the same material specification as the material used for the vessel. b) Parts of the supports which are not welded to the vessel shall either be made from
19、material in accordance with the same material specification as used for the vessel, or from material of grades 1.0038, 1.0044, 1.0114 or 1.0143 in accordance with BS EN 10025, providing they are suitable at the predicted temperature. 3.2 Anti-friction materials for sliding supports When polytetraflu
20、oroethylene (PTFE) is specified for sliding supports (see 6.1) it shall conform to BS EN 13000. PTFE shall not be used for applications at temperatures in excess of 200 C. 4 Dimensions 4.1 The dimensions of the supports shall be in accordance with Figure 1 or Figure 2, according to the diameter of t
21、he vessel. 4.2 Saddle supports shall fit closely, and the gap at all exposed edges to be welded shall not exceed 2 mm or one-twentieth of the thickness of the attachment at the point of attachment, whichever is the greater.BS 5276-2:2003 2 BSI 7 July 2003 5 Manufacture Saddle supports shall normally
22、 be welded to the vessel before any post-weld heat treatment, but in exceptional circumstances, the saddle shall be attached following post-weld heat treatment, provided that the saddle plate is continuously welded to the shell before post-weld heat treatment. NOTE This standard does not specify a p
23、rocedure for welding the saddle supports to the vessel after post-weld heat treatment and the full procedure, including the welding of the saddle, should be subject to agreement between the manufacturer and the purchaser. 6 Design considerations 6.1 Provision for axial movement One support shall be
24、fixed and the other shall be restrained laterally but able to move axially to accommodate movement resulting from thermal effects and axial strain. The sliding support shall be determined from Figure 3 as either the steel-on-steel type (see Figure 4) or of low friction material (see Figure 5). NOTE
25、It is assumed that the coefficient of friction is 1 for steel-on-steel sliding supports and 0.1 for sliding supports of low friction material. On this basis, the use of the steel-on-steel type is to be limited to those applications where the load on the saddle support falls below the curve on Figure
26、 3 and is also less than 0.1 W v(see Clause 7). In cases where either of these limitations is exceeded, low friction material should be used. The choice of sliding support to be used is further influenced by consideration of the horizontal forces imposed upon the foundations or supporting steelworks
27、.BS 5276-2:2003 BSI 7 July 2003 3 Weld details: (a) Fabrication of saddle supports: continuous fillet welds on both sides of the plate with leg lengths of 6 mm. (b) Connecting saddle plate to shell: continuous fillet welds with leg lengths equal to the saddle plate thickness or 10 mm, whichever is t
28、he lesser. Key 1 Equally spaced. 2 At least one hole drilled through saddle plate and tapped in B.S.P. (R c conforming to BS 21). All dimensions are in millimetres unless stated otherwise Internal diameter of vessel Dimensions as shown in Figure 1 Centre rib required Holding down bolts a Approximate
29、 mass of saddle support bkg Maximum load, W s(see Clause 7) kg PB C D F a HXJKM Diameter of holes Size of bolts 600 to 750 600 To be equal to vessel shell thickness (t) up to a maximum of 15 225 180 130 260 60 No 22 2 500 800 to 950 750 200 12 300 6 336 26 M20 28 5 000 1 000 to 1 150 900 375 250 190
30、 410 80 Yes 42 9 000 a Details of holding down bolts are applicable to fixed supports and are not applicable to sliding supports (see 6.1). b Mass of saddle support given is without saddle plate (this varies according to vessel shell thickness). Figure 1 Saddle supports for horizontal vessels of int
31、ernal diameter of 600 mm to 1 150 mm C B D JJ F K P M R H/4 H b 1= J + X X J 25 120 6 1 2BS 5276-2:2003 4 BSI 7 July 2003 Weld details: (a) Fabrication of saddle supports: continuous fillet welds on both sides of the plate with leg lengths of 6 mm for vessels with internal diameters from 1 200 mm to
32、 1 900 mm, inclusive and with leg lengths of 8 mm for vessels with internal diameters from 2 000 mm to 3 000 mm, inclusive. (b) Connecting saddle plate to shell: continuous fillet welds with leg lengths equal to the saddle plate thickness or 10 mm, whichever is the lesser. Key 1 At least one hole dr
33、illed through saddle plate and tapped ! in B.S.P. (R c! conforming to BS 21). All dimensions are in millimetres unless stated otherwise Internal diameter of vessel Dimensions as shown in Figure 2 Holding down bolts a Approximate mass of saddle support b kg Maximum load, W s(see Clause 7) kg PB C DE
34、F a H G a JMXY Diameter of holes Size of bolts 1 200 to 1 500 1 150 To be equal to vessel shell thickness (t) up to a maximum of 15 290 500 250 180 85 90 26 M20 100 20 000 1 600 to 1 900 1 450 15 380 650 12.5 110 12 30 M24 145 40 000 2 000 to 2 300 1 750 226 470 775 300 220 130 120 220 65 000 2 400
35、to 2 700 2 050 20 550 900 15 150 15 36 M30 300 100 000 2 800 to 3 000 2 300 630 1 025 400 300 20 160 160 350 130 000 a Details of holding down bolts are applicable to fixed supports and are not applicable to sliding supports (see 6.1). b Mass of saddle support given is without saddle plate (this var
36、ies according to vessel shell thickness). Figure 2 Saddle supports for horizontal vessels of internal diameter of 1 200 mm to 3 000 mm 120 50 B D Y F E P E/2 8 M R H/4 H b 1 =J+2X X X J G H 1BS 5276-2:2003 BSI 7 July 2003 5 6.2 Holding down bolts The position and sizes of holding down bolts shall be
37、 in accordance with the fixed support shown in Figure 1 and Figure 2. The tensile forces given in Table 1 shall be used to assess the margin in hand to cater for additional overturning moments from pipework, platforms, etc. Table 1 Tensile forces in holding down bolts Holding down bolts shall be pro
38、vided at the sliding support if flotation is to be guarded against. 6.3 Special considerations Special additional consideration shall be given to the following: a) cyclic conditions which can lead to fatigue, see PD 5500:2003, Annex C; b) saddle supports not welded to the shell; c) saddle supports l
39、ocated at positions, relative to the domed ends, different to those indicated in Figure 6; d) subsidence occurring at one support relative to the other, which can result in loading and structural implications. e) vessels installed on a slope, e.g. to cater for drainage. NOTE The position and sizes o
40、f holding down bolts specified are adequate to resist overturning without the need for holding down bolts in the sliding support. They are designed for empty vessels of minimum thickness (6 mm) and maximum length derived from L t /D i= 5 (see Clause 7), with a basic wind speed of 31 m/s, see BS 6399
41、-2. The resultant tensile forces in the holding down bolts on the windward side resulting from the above consideration are as shown in Table 1. Vessel diameter mm Tensile force per bolt N 750 2 240 950 2 720 1 150 3 120 1 500 1 890 1 900 2 530 2 300 3 380 2 700 4 330 3 000 6 610BS 5276-2:2003 6 BSI
42、7 July 2003 7 Maximum permissible loads The maximum permissible load which may be supported on each saddle support shall be the lesser of the following. a) The load relevant to the structural design of the supports, which is equivalent to the force exerted by a mass of W s . Values of W s , in kilog
43、rams, are given in Figure 1 and Figure 2. b) The load relevant to the strength of the vessel shell, which is equivalent to the force exerted by a mass of W v . Values of W vin kilograms, are determined in accordance with the following formula: W v= Kf where K is the coefficient given in Table 2 (see
44、 A.2 for derivation); f is the permissible design stress in the vessel shell, in N/mm 2 . NOTE 1 Information provided for evaluating the maximum permissible load on shells of non-cyclically loaded vessels is based on the method given in PD 5500:2003, G.3.3 for shells not stiffened by rings at the sa
45、ddles, and applies to the direct load of the weight of the vessel and its contents reacting through the supports positioned at specified locations on the shell cylinder. NOTE 2 Attention is drawn to the need to consider all external forces and superimposed loads. For vessels which are to be hydrauli
46、cally tested, the weight of water should be taken into account. The following conditions apply. 1) The coefficient K shall be applicable only to steel shell materials having a permissible design stress not exceeding 210 N/mm 2at 50 C, with corresponding values at higher temperatures. 2) In calculati
47、ng coefficient K, it shall be assumed that the shell thickness has been reduced by corrosion by 1.5 mm. NOTE 3 Corrosion allowance has not been allowed for in the saddle plate. 3) Domed ends shall be either of ellipsoidal or torispherical shape conforming to the shape limitations of PD 5500:2003, 3.
48、5.2.2. 4) The location of supports relative to domed ends shall be as follows. i) For vessels of internal diameter from 600 mm up to and including 750 mm, the supports shall be located where: where A is the distance from the centreline of the saddle support to the tangent line of the domed end; L t
49、is the length of the cylindrical portion of the vessel between the tangent lines of the domed ends. NOTE 4 The shell cylinder is not stiffened by the vessel ends. ii) For vessels of internal diameter of 800 mm and larger, the supports shall be located where: where b 1 is the effective width of the saddle support (see Figure 1 and Figure 2); D iis the inside diameter of the vessel. NOTE 5 The shell cylinder is stiffened by the vessel ends. NOTE 6 Permissibl
