1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58SpecificationICS 23.060.30Penstocks for use in water and other liquid flow applications BRITISH STA
2、NDARDBS 7775:2005BS 7775:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 26 September 2005 BSI 26 September 2005First published April 1995First revision September 2005The following BSI references relate to the work on this British Standar
3、d:Committee reference PSE/7/3Draft for comment 05/30113263 DCISBN 0 580 46651 5BSI Testing Product CertificationBVAA British Valve and Actuator AssociationCMF Cast Metals FederationDuctile Iron Producers AssociationEnergy Industries CouncilInstitution of Mechanical EngineersPipeline Industries Guild
4、SBWWI Society of British Water and Wastewater IndustriesWater UKAmendments issued since publicationAmd. No. Date CommentsCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by Technical Committee PSE/7, Valves, to Subcommittee PSE/7/3, Cast iron iso
5、lating, check and hydrant valves for industrial use and valves water industry applications, upon which the following bodies were represented:British Chemical Engineering Contractors AssociationBS 7775:2005 BSI 26 September 2005ContentsPageCommittees responsible Inside front coverForeword ii1Scope 12
6、 Normative references 13 Terms and definitions 24 Design requirements 75 Performance requirements 116 Conformity assessment 127 Marking 138Packaging 149 Installation 14Annex A (normative) Information to be supplied by the purchaser 15Bibliography 16Figure 1 Seating arrangements 5Figure 2 Typical pen
7、stock frame with door 6Figure 3 Maximum leakage rate for rigid sealing faces under an off-seating head 11Figure 4 Maximum leakage rate for resilient seating faces under either an on- or off-seating head 12Figure 5 Typical identification plate 13Table 1 Penstock aperture tolerances 10Table A.1 Inform
8、ation to be supplied to the manufacturer 15iBS 7775:2005iiCommittee PSE/7 by Subcommittee PSE/7/3. It supersedes BS 7775:1995, which is withdrawn.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with
9、 a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the docu
10、ment was last issued.ForewordThis British Standard has been prepared under the authority of Technical BSI 26 September 2005BS 7775:20051 ScopeThis standard specifies the design and performance criteria for penstocks for use in waste water, water supply and other liquid flow applications. This standa
11、rd also sets out the requirements for packaging and installation of penstocks. Annex A sets out information to be supplied by the purchaser for the correct supply of a penstock.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated
12、references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 449-2, Specification for the use of structural steel in building Part 2: Metric units.BS 4618 (all parts), Recommendations for the presentation of p
13、lastics design data.BS 5950-2, Structural use of steelwork in building Part 2: Specification for materials, fabrication and erection Rolled and welded sections.BS 6920-1, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on
14、the quality of the water Specification.BS EN 287-1, Qualification test of welders Fusion welding Part 1: Steels.BS EN 287-2, Approval testing of welders for fusion welding Part 2: Aluminium and its alloys.BS EN 288 (all parts), Specification and approval of welding procedures for metallic materials.
15、BS EN 1011-1, Welding Recommendations for welding of metallic materials General guidance for arc welding.BS EN 1011-2, Welding Recommendations for welding of metallic materials Arc welding of ferritic steels.BS EN 1074-1, Valves for water supply Fitness for purpose requirements and appropriate verif
16、ication tests Part 1: General requirements.BS EN 1418, Welding personnel Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials.BS EN 1561:1997, Founding Grey cast irons.BS EN 1563:1997, Founding Spheroida
17、l graphite cast iron.BS EN 10088-3:1995, Stainless steels Part 3: Technical delivery conditions for semi-finished products, bars, rods and sections for general purposes.BS EN ISO 15614-8, Specification and qualification of welding procedures for metallic materials Welding procedure test Part 8: Weld
18、ing of tubes to tube-plate joints.BS EN ISO 9000, Quality management systems Fundamentals and vocabulary. BSI 26 September 20051BS 7775:20053 Terms and definitionsFor the purposes of this standard, the following terms and definitions apply.3.1 Equipment3.1.1 penstockpiece of equipment used to isolat
19、e and/or control the flow or level of a liquid consisting of a sliding door moving over the aperture in a frame which is secured on to a structure3.1.2 penstock apertureopening in the penstock frame for the passage of liquidsNOTE 1 See Figure 1. NOTE 2 For rectangular penstocks the width refers to t
20、he horizontal aperture dimension and the height refers to the vertical aperture dimension; aperture size is always the width dimension followed by the height.3.1.3 penstock doorobturator retained within the frame which is opened or closed by operating equipment to expose or obscure the frame apertur
21、e to isolate and/or control the flow or level of a liquidNOTE See Figure 2.3.1.4 penstock framemeans of fixing the penstock to a structure and retaining the door for the range of movement between the open and closed positionsNOTE See Figure 2.3.1.5 sealmaterial fitted between the frame and the door
22、to minimize leakageNOTE 1 See Clause 5.NOTE 2 The material can be either rigid (i.e. metal to metal) or resilient.3.1.6 Stems3.1.6.1 stemmeans of raising and lowering the penstock doorNOTE There are two basic options for stems, given in 3.1.6.2 and 3.1.6.3.3.1.6.2 non-rising stemstem in which the ro
23、tation of the threaded stem in the operating nut, located in the top of the door, moves the door up or down the stem3.1.6.3 rising stemstem in which the rotation of the operating nut, located in the operating equipment, or the operation of a hydraulic or pneumatic cylinder raises or lowers the stem
24、to which the door is connected by a stem block3.1.7 wedging device pressure devicecomponent which forces the door and frame together2 BSI 26 September 2005NOTE See Figure 2.BS 7775:20053.1.8 yokeintegral or separate cross-member at the top of the frame sides and/or door guides of a penstockNOTE See
25、Figure 2.3.1.9 door guidecomponent which may be secured to, or be an integral part of, the penstock frame for the purpose of retaining/guiding the door during operation and when in the fully open position3.1.10 operating equipmentmeans, integral with the penstock, of opening and closing the door man
26、ually or by power operation3.2 General3.2.1 leakageliquid passing between the door and frame sealing faces of a penstock with the door in the fully closed position3.2.2 copingtop surface of a wall or channel wallNOTE See Figure 2.3.2.3 flooroverhead operating levelNOTE See Figure 2.3.2.4 invertbotto
27、m surface of the frame or apertureNOTE See Figure 1.3.2.5 soffitunder surface of the top of the frame apertureNOTE See Figure 1.3.2.6 outreachdimension measured from the mounting face of the penstock frame to the centre line of a stem, not making any allowance for sealing material between the frame
28、and the wallNOTE See Figure 1.3.3 Thrust types3.3.1 thrustoperating force required to open and close the penstock door3.3.2 direct thrustthrust transmitted from the operating equipment directly to the penstock frame yoke BSI 26 September 200533.3.3 remote thrustthrust transmitted from the operating
29、equipment to the structure remote from the penstockBS 7775:20053.4 Operating function3.4.1 isolating penstockpenstock which can be either fully open or fully closed3.4.2 control penstockpenstock which can be stopped at any position within its movement range in order to provide flow control3.5 Invert
30、 types3.5.1 flush invert typepenstock in which closure is effected by the downward movement of the door on to the invert sealNOTE The invert seal is arranged at right angles to the side and soffit seals and can be fixed to either the frame or door (see Figure 1).3.5.2 rebate invert typepenstock in w
31、hich closure is effected by the downward movement of the door past the frame aperture invertNOTE Side, soffit and invert seals are all in the same vertical plane (see Figure 1).3.5.3 weir typepenstock in which closure is effected by the vertical upward movement of the doorNOTE Side and invert sealin
32、g is effected at all intermediate positions between open or closed.3.6 Fixing types3.6.1 channel rebate fixingflush invert penstock fixed into pre-formed rebates in the sides and invert of channels with or without anchor bolts and sealed into the rebate in accordance with the manufacturers instructi
33、ons3.6.2 pipe flange fixingpenstock bolted to a pipe flange3.6.3 wall fixingrebate/flush invert penstock fixed to vertical walls of channels, chambers or similar structures by means of anchor bolts and sealed to the wall in accordance with the manufacturers instructions3.6.4 wall thimble fixingpenst
34、ock bolted to a suitable insert, of the required shape, pre-cast into the civil structureNOTE Wall thimbles may be considered for use when there are very high off-seating heads.3.7 Fluid loadings3.7.1 headheight of liquid above the penstock invert3.7.2 operating headmaximum differential head against
35、 which the penstock can be operated4 BSI 26 September 20053.7.3 differential headdifference between the on-seating head and the off-seating head with the door in the closed positionNOTE See Figure 1.BS 7775:20053.7.4 maximum static headmaximum possible differential head for which the penstock has to
36、 be structurally designedNOTE The static head can be greater than the operating head.3.7.5 on-seating headhead of liquid which forces the door and frame togetherNOTE See Figure 1.3.7.6 off-seating headhead of liquid which acts to force the door and frame apartNOTE See Figure 1.a) On-seating head b)
37、Off-seating headKey 1 Coping 2 Outreach 3 Soffit 4 Head (measured from invert to water level)5 Aperture 6 Flush invert 7 Rebate invert12345647 BSI 26 September 20055Figure 1 Seating arrangementsBS 7775:2005a) Open top penstock frame with door b) Closed top penstock frame with operating gearKey 1 Spi
38、ndle 2 Spindle nut 3 Wedge/pressure device 4 Door 5 FrameKey 1 Spindle protection tube and door position indicator 2 Operating equipment 3 Pillar 4 Floor or coping 5 Coping bracket 6 Spindle guide bracket 7 Spindle coupling 8 YokeFigure 2 Typical penstock frame with door12435123456786 BSI 26 Septemb
39、er 2005BS 7775:20054 Design requirements4.1 GeneralThe design of all penstock components shall take into account the loads generated directly by the heads and also those created by the selected method of operation. The procedures of 4.2 to 4.12 shall be observed in the design and manufacture of pens
40、tocks.4.2 Penstock typesThe operating function, invert type and fixing type of the penstock shall be selected from one of the types defined in 3.5.1, 3.5.2 and 3.5.3 for the application as stipulated by the purchaser (see Annex A).4.3 Penstock frame4.3.1 Frame designWhen correctly installed the fram
41、es shall be of sufficient strength to withstand safely the maximum static head (see 3.7.4) stipulated by the purchaser (see Annex A) and the resultant forces generated by the operating equipment.4.3.2 Type of frameFrames shall be one of the following types.a) Cast iron frames shall be designed and m
42、anufactured to conform to BS EN 1561:1997 or BS EN 1563:1997.b) Fabricated metal frames shall be designed so that the stresses and deflections in the frame do not exceed the safe working figures specified in 4.9.4 and 4.9.5. Welding shall be in accordance with BS EN ISO 15614-8, BS EN 1418, BS EN 28
43、7-1, BS EN 287-2, BS EN 1011-1, BS EN 1011-2 and/or BS EN 288 (all parts), as appropriate. Design and fabrication shall be in accordance with BS 5950-2.4.3.3 Frame fixingsWhere applicable, frame fixings shall be sufficient in number and size to prevent any movement of the penstock resulting from the
44、 design head conditions and the forces generated by the operating equipment.4.3.4 Door guidesDoor guides (see 3.1.9) shall be provided on the frame.4.3.5 SealingProvision shall be made within the frame design for the seal arrangement.4.3.6 Wedging or pressure devicesProvision shall be made within th
45、e frame design for the wedging or pressure devices, should the operating conditions require them.4.4 Penstock door4.4.1 GeneralThe door shall be designed to provide a means of safely withstanding the maximum static head (see 3.7.4) specified by the purchaser (see Annex A) and the resultant forces ge
46、nerated by the operating equipment. It shall be able to travel freely between the fully closed and fully open positions. BSI 26 September 20057BS 7775:20054.4.2 Type of doorDoors shall be one of the following types.a) Cast iron doors shall be designed and manufactured from material conforming to BS
47、EN 1561:1997 or BS EN 1563:1997.b) Fabricated metal doors shall be designed so that the stresses and deflections in the door do not exceed the safe working figures specified in 4.9.4 and 4.9.5. Welding shall be in accordance with BS EN ISO 15614-8, BS EN 1418, BS EN 287-1, BS EN 287-2, BS EN 1011-1,
48、 BS EN 1011-2 and/or BS EN 288 (all parts), as appropriate. Design and fabrication shall be in accordance with BS 5950-2.c) Composite plastic doors shall be fabricated, formed or moulded and shall be suitably reinforced internally or externally as required. If the reinforcement is internal the plast
49、ic exterior shall be fully sealed and chemically bonded to the reinforcing matrix and to any cellular polymer or other infill material. The plastic material shall be ultraviolet stabilized in accordance with BS 4618.4.4.3 Stem connectionThe door design shall include a means of connecting the door to the stem.4.4.4 Door locatorThe door design shall include a means by which it is retained within the frame throughout its travel.4.4.5 Sealing
